Inheritance diagram for DatabaseBase:

Collaboration diagram for DatabaseBase:

Public Member Functions
	__construct (array $params)
	Constructor. More...

	__destruct ()
	Run a few simple sanity checks. More...

	__sleep ()
	Called by serialize. More...

	__toString ()

	addIdentifierQuotes ($s)
	Quotes an identifier using `backticks` or "double quotes" depending on the database type. More...

	addQuotes ($s)
	Adds quotes and backslashes. More...

	aggregateValue ($valuedata, $valuename= 'value')
	Return aggregated value alias. More...

	anyChar ()
	Returns a token for buildLike() that denotes a '_' to be used in a LIKE query. More...

	anyString ()
	Returns a token for buildLike() that denotes a '' to be used in a LIKE query. More...

	begin ($fname=__METHOD__)
	Begin a transaction. More...

	bitAnd ($fieldLeft, $fieldRight)

	bitNot ($field)

	bitOr ($fieldLeft, $fieldRight)

	bufferResults ($buffer=null)
	Turns buffering of SQL result sets on (true) or off (false). More...

	buildConcat ($stringList)
	Build a concatenation list to feed into a SQL query. More...

	buildGroupConcatField ($delim, $table, $field, $conds= '', $join_conds=[])
	Build a GROUP_CONCAT or equivalent statement for a query. More...

	buildLike ()
	LIKE statement wrapper, receives a variable-length argument list with parts of pattern to match containing either string literals that will be escaped or tokens returned by anyChar() or anyString(). More...

	cascadingDeletes ()
	Returns true if this database supports (and uses) cascading deletes. More...

	cleanupTriggers ()
	Returns true if this database supports (and uses) triggers (e.g. More...

	clearFlag ($flag)
	Clear a flag for this connection. More...

	clearViewsCache ()
	Reset the views process cache set by listViews() More...

	close ()
	Closes a database connection. More...

	commit ($fname=__METHOD__, $flush= '')
	Commits a transaction previously started using begin(). More...

	conditional ($cond, $trueVal, $falseVal)
	Returns an SQL expression for a simple conditional. More...

	connectionErrorHandler ($errno, $errstr)

	dbSchema ($schema=null)
	Get/set the db schema. More...

	deadlockLoop ()
	Perform a deadlock-prone transaction. More...

	debug ($debug=null)
	Boolean, controls output of large amounts of debug information. More...

	decodeBlob ($b)
	Some DBMSs return a special placeholder object representing blob fields in result objects. More...

	decodeExpiry ($expiry, $format=TS_MW)
	Decode an expiry time into a DBMS independent format. More...

	delete ($table, $conds, $fname=__METHOD__)
	DELETE query wrapper. More...

	deleteJoin ($delTable, $joinTable, $delVar, $joinVar, $conds, $fname=__METHOD__)
	DELETE where the condition is a join. More...

	doAtomicSection ($fname, callable $callback)
	Run a callback to do an atomic set of updates for this database. More...

	doneWrites ()
	Returns true if the connection may have been used for write queries. More...

	dropTable ($tableName, $fName=__METHOD__)
	Delete a table. More...

	duplicateTableStructure ($oldName, $newName, $temporary=false, $fname=__METHOD__)
	Creates a new table with structure copied from existing table Note that unlike most database abstraction functions, this function does not automatically append database prefix, because it works at a lower abstraction level. More...

	encodeBlob ($b)
	Some DBMSs have a special format for inserting into blob fields, they don't allow simple quoted strings to be inserted. More...

	encodeExpiry ($expiry)
	Encode an expiry time into the DBMS dependent format. More...

	endAtomic ($fname=__METHOD__)
	Ends an atomic section of SQL statements. More...

	estimateRowCount ($table, $vars= '*', $conds= '', $fname=__METHOD__, $options=[])
	Estimate the number of rows in dataset. More...

	execute ($prepared, $args=null)
	Execute a prepared query with the various arguments. More...

	fieldExists ($table, $field, $fname=__METHOD__)
	Determines whether a field exists in a table. More...

	fieldNamesWithAlias ($fields)
	Gets an array of aliased field names. More...

	fieldNameWithAlias ($name, $alias=false)
	Get an aliased field name e.g. More...

	fillPrepared ($preparedQuery, $args)
	For faking prepared SQL statements on DBs that don't support it directly. More...

	freeResult ($res)
	Free a result object returned by query() or select(). More...

	functionalIndexes ()
	Returns true if this database can use functional indexes. More...

	getApproximateLagStatus ()
	Get a slave lag estimate for this server. More...

	getDBname ()
	Get the current DB name. More...

	getDelimiter ()

	getFlag ($flag)
	Returns a boolean whether the flag $flag is set for this connection. More...

	getInfinity ()
	Find out when 'infinity' is. More...

	getLag ()
	Get slave lag. More...

	getLazyMasterHandle ()

	getLBInfo ($name=null)
	Get properties passed down from the server info array of the load balancer. More...

	getMasterPos ()
	Get the position of this master. More...

	getProperty ($name)
	General read-only accessor. More...

	getSchemaPath ()
	Return a path to the DBMS-specific schema file, otherwise default to tables.sql. More...

	getScopedLockAndFlush ($lockKey, $fname, $timeout)
	Acquire a named lock, flush any transaction, and return an RAII style unlocker object. More...

	getSearchEngine ()
	Get search engine class. More...

	getServer ()
	Get the server hostname or IP address. More...

	getServerInfo ()
	A string describing the current software version, and possibly other details in a user-friendly way. More...

	getServerUptime ()
	Determines how long the server has been up STUB. More...

	getSessionLagStatus ()
	Get the slave lag when the current transaction started or a general lag estimate if not transaction is active. More...

	getSlavePos ()
	Get the replication position of this slave. More...

	getTransactionLagStatus ()
	Get the slave lag when the current transaction started. More...

	getUpdateKeysPath ()
	Return a path to the DBMS-specific update key file, otherwise default to update-keys.sql. More...

	getWikiID ()

	implicitGroupby ()
	Returns true if this database does an implicit sort when doing GROUP BY. More...

	implicitOrderby ()
	Returns true if this database does an implicit order by when the column has an index For example: SELECT page_title FROM page LIMIT 1. More...

	indexExists ($table, $index, $fname=__METHOD__)
	Determines whether an index exists Usually throws a DBQueryError on failure If errors are explicitly ignored, returns NULL on failure. More...

	indexInfo ($table, $index, $fname=__METHOD__)
	Get information about an index into an object. More...

	indexUnique ($table, $index)
	Determines if a given index is unique. More...

	insert ($table, $a, $fname=__METHOD__, $options=[])
	INSERT wrapper, inserts an array into a table. More...

	insertSelect ($destTable, $srcTable, $varMap, $conds, $fname=__METHOD__, $insertOptions=[], $selectOptions=[])
	INSERT SELECT wrapper. More...

	isOpen ()
	Is a connection to the database open? More...

	isQuotedIdentifier ($name)
	Returns if the given identifier looks quoted or not according to the database convention for quoting identifiers . More...

	isReadOnly ()

	isView ($name)
	Differentiates between a TABLE and a VIEW. More...

	lastDoneWrites ()
	Returns the last time the connection may have been used for write queries. More...

	lastQuery ()
	Return the last query that went through IDatabase::query() More...

	limitResult ($sql, $limit, $offset=false)
	Construct a LIMIT query with optional offset. More...

	listTables ($prefix=null, $fname=__METHOD__)
	List all tables on the database. More...

	listViews ($prefix=null, $fname=__METHOD__)
	Lists all the VIEWs in the database. More...

	lock ($lockName, $method, $timeout=5)
	Acquire a named lock. More...

	lockIsFree ($lockName, $method)
	Check to see if a named lock is available (non-blocking) More...

	lockTables ($read, $write, $method, $lowPriority=true)
	Lock specific tables. More...

	lowPriorityOption ()
	A string to insert into queries to show that they're low-priority, like MySQL's LOW_PRIORITY. More...

	makeGroupByWithHaving ($options)
	Returns an optional GROUP BY with an optional HAVING. More...

	makeList ($a, $mode=LIST_COMMA)
	Makes an encoded list of strings from an array. More...

	makeOrderBy ($options)
	Returns an optional ORDER BY. More...

	makeSelectOptions ($options)
	Returns an optional USE INDEX clause to go after the table, and a string to go at the end of the query. More...

	makeWhereFrom2d ($data, $baseKey, $subKey)
	Build a partial where clause from a 2-d array such as used for LinkBatch. More...

	masterPosWait (DBMasterPos $pos, $timeout)
	Wait for the slave to catch up to a given master position. More...

	maxListLen ()
	Return the maximum number of items allowed in a list, or 0 for unlimited. More...

	namedLocksEnqueue ()
	Check to see if a named lock used by lock() use blocking queues. More...

	nextSequenceValue ($seqName)
	Returns an appropriately quoted sequence value for inserting a new row. More...

	onTransactionIdle (callable $callback)
	Run a callback as soon as there is no transaction pending. More...

	onTransactionPreCommitOrIdle (callable $callback)
	Run a callback before the current transaction commits or now if there is none. More...

	onTransactionResolution (callable $callback)
	Run a callback as soon as the current transaction commits or rolls back. More...

	patchPath ($patch)
	Get the full path of a patch file. More...

	pendingWriteCallers ()
	Get the list of method names that did write queries for this transaction. More...

	pendingWriteQueryDuration ()
	Get the time spend running write queries for this transaction. More...

	ping ()
	Ping the server and try to reconnect if it there is no connection. More...

	query ($sql, $fname=__METHOD__, $tempIgnore=false)
	Run an SQL query and return the result. More...

	realTimestamps ()
	Returns true if this database uses timestamps rather than integers. More...

	replace ($table, $uniqueIndexes, $rows, $fname=__METHOD__)
	REPLACE query wrapper. More...

	reportConnectionError ($error= 'Unknown error')

	reportQueryError ($error, $errno, $sql, $fname, $tempIgnore=false)
	Report a query error. More...

	rollback ($fname=__METHOD__, $flush= '')
	Rollback a transaction previously started using begin(). More...

	runOnTransactionIdleCallbacks ($trigger)
	Actually run and consume any "on transaction idle/resolution" callbacks. More...

	runOnTransactionPreCommitCallbacks ()
	Actually run and consume any "on transaction pre-commit" callbacks. More...

	searchableIPs ()
	Returns true if this database can do a native search on IP columns e.g. More...

	select ($table, $vars, $conds= '', $fname=__METHOD__, $options=[], $join_conds=[])
	Execute a SELECT query constructed using the various parameters provided. More...

	selectDB ($db)
	Change the current database. More...

	selectField ($table, $var, $cond= '', $fname=__METHOD__, $options=[])
	A SELECT wrapper which returns a single field from a single result row. More...

	selectFieldValues ($table, $var, $cond= '', $fname=__METHOD__, $options=[], $join_conds=[])

	selectRow ($table, $vars, $conds, $fname=__METHOD__, $options=[], $join_conds=[])
	Single row SELECT wrapper. More...

	selectRowCount ($tables, $vars= '*', $conds= '', $fname=__METHOD__, $options=[], $join_conds=[])
	Get the number of rows in dataset. More...

	selectSQLText ($table, $vars, $conds= '', $fname=__METHOD__, $options=[], $join_conds=[])
	The equivalent of IDatabase::select() except that the constructed SQL is returned, instead of being immediately executed. More...

	serverIsReadOnly ()

	setBigSelects ($value=true)
	Allow or deny "big selects" for this session only. More...

	setFileHandle ($fh)
	Set the filehandle to copy write statements to. More...

	setFlag ($flag)
	Set a flag for this connection. More...

	setLazyMasterHandle (IDatabase $conn)
	Set a lazy-connecting DB handle to the master DB (for replication status purposes) More...

	setLBInfo ($name, $value=null)
	Set the LB info array, or a member of it. More...

	setPostCommitCallbackSupression ($suppress)
	Whether to disable running of post-commit callbacks. More...

	setSchemaVars ($vars)
	Set variables to be used in sourceFile/sourceStream, in preference to the ones in $GLOBALS. More...

	setSessionOptions (array $options)
	Override database's default behavior. More...

	setTransactionProfiler (TransactionProfiler $profiler)

	sourceFile ($filename, $lineCallback=false, $resultCallback=false, $fname=false, $inputCallback=false)
	Read and execute SQL commands from a file. More...

	sourceStream ($fp, $lineCallback=false, $resultCallback=false, $fname=__METHOD__, $inputCallback=false)
	Read and execute commands from an open file handle. More...

	startAtomic ($fname=__METHOD__)
	Begin an atomic section of statements. More...

	streamStatementEnd (&$sql, &$newLine)
	Called by sourceStream() to check if we've reached a statement end. More...

	strencode ($s)
	Wrapper for addslashes() More...

	strictIPs ()
	Returns true if this database is strict about what can be put into an IP field. More...

	strreplace ($orig, $old, $new)
	Returns a comand for str_replace function in SQL query. More...

	tableExists ($table, $fname=__METHOD__)
	Query whether a given table exists. More...

	tableName ($name, $format= 'quoted')
	Format a table name ready for use in constructing an SQL query. More...

	tableNames ()
	Fetch a number of table names into an array This is handy when you need to construct SQL for joins. More...

	tableNamesN ()
	Fetch a number of table names into an zero-indexed numerical array This is handy when you need to construct SQL for joins. More...

	tableNamesWithAlias ($tables)
	Gets an array of aliased table names. More...

	tableNameWithAlias ($name, $alias=false)
	Get an aliased table name e.g. More...

	tablePrefix ($prefix=null)
	Get/set the table prefix. More...

	textFieldSize ($table, $field)
	Returns the size of a text field, or -1 for "unlimited". More...

	timestamp ($ts=0)
	Convert a timestamp in one of the formats accepted by wfTimestamp() to the format used for inserting into timestamp fields in this DBMS. More...

	timestampOrNull ($ts=null)
	Convert a timestamp in one of the formats accepted by wfTimestamp() to the format used for inserting into timestamp fields in this DBMS. More...

	trxLevel ()
	Gets the current transaction level. More...

	trxTimestamp ()
	Get the UNIX timestamp of the time that the transaction was established. More...

	unionQueries ($sqls, $all)
	Construct a UNION query This is used for providing overload point for other DB abstractions not compatible with the MySQL syntax. More...

	unionSupportsOrderAndLimit ()
	Returns true if current database backend supports ORDER BY or LIMIT for separate subqueries within the UNION construct. More...

	unlock ($lockName, $method)
	Release a lock. More...

	unlockTables ($method)
	Unlock specific tables. More...

	update ($table, $values, $conds, $fname=__METHOD__, $options=[])
	UPDATE wrapper. More...

	upsert ($table, array $rows, array $uniqueIndexes, array $set, $fname=__METHOD__)
	INSERT ON DUPLICATE KEY UPDATE wrapper, upserts an array into a table. More...

	useIndexClause ($index)
	USE INDEX clause. More...

	wasConnectionError ($errno)
	Determines if the given query error was a connection drop STUB. More...

	wasDeadlock ()
	Determines if the last failure was due to a deadlock STUB. More...

	wasErrorReissuable ()
	Determines if the last query error was something that should be dealt with by pinging the connection and reissuing the query. More...

	wasLockTimeout ()
	Determines if the last failure was due to a lock timeout STUB. More...

	wasReadOnlyError ()
	Determines if the last failure was due to the database being read-only. More...

	writesOrCallbacksPending ()
	Returns true if there is a transaction open with possible write queries or transaction pre-commit/idle callbacks waiting on it to finish. More...

	writesPending ()

Public Member Functions inherited from IDatabase
	affectedRows ()
	Get the number of rows affected by the last write query. More...

	dataSeek ($res, $row)
	Change the position of the cursor in a result object. More...

	fetchObject ($res)
	Fetch the next row from the given result object, in object form. More...

	fetchRow ($res)
	Fetch the next row from the given result object, in associative array form. More...

	fieldInfo ($table, $field)
	mysql_fetch_field() wrapper Returns false if the field doesn't exist More...

	fieldName ($res, $n)
	Get a field name in a result object. More...

	getServerVersion ()
	A string describing the current software version, like from mysql_get_server_info(). More...

	getSoftwareLink ()
	Returns a wikitext link to the DB's website, e.g., return "[http://www.mysql.com/ MySQL]"; Should at least contain plain text, if for some reason your database has no website. More...

	getType ()
	Get the type of the DBMS, as it appears in $wgDBtype. More...

	insertId ()
	Get the inserted value of an auto-increment row. More...

	lastErrno ()
	Get the last error number. More...

	lastError ()
	Get a description of the last error. More...

	numFields ($res)
	Get the number of fields in a result object. More...

	numRows ($res)
	Get the number of rows in a result object. More...

	open ($server, $user, $password, $dbName)
	Open a connection to the database. More...

	selectFieldValues ($table, $var, $cond= '', $fname=__METHOD__, $options=[])
	A SELECT wrapper which returns a list of single field values from result rows. More...

Static Public Member Functions
static	factory ($dbType, $p=[])
	Given a DB type, construct the name of the appropriate child class of DatabaseBase. More...

static	getCacheSetOptions (IDatabase $db1)
	Merge the result of getSessionLagStatus() for several DBs using the most pessimistic values to estimate the lag of any data derived from them in combination. More...

Public Attributes
	$mDBname

	$mPassword

	$mUser

const	DEADLOCK_DELAY_MAX = 1500000
	Maximum time to wait before retry. More...

const	DEADLOCK_DELAY_MIN = 500000
	Minimum time to wait before retry, in microseconds. More...

const	DEADLOCK_TRIES = 4
	Number of times to re-try an operation in case of deadlock. More...

Public Attributes inherited from IDatabase
const	TRIGGER_COMMIT = 2

const	TRIGGER_IDLE = 1

const	TRIGGER_ROLLBACK = 3

Protected Member Functions
	assertOpen ()
	Make sure isOpen() returns true as a sanity check. More...

	closeConnection ()
	Closes underlying database connection. More...

	doBegin ($fname)
	Issues the BEGIN command to the database server. More...

	doCommit ($fname)
	Issues the COMMIT command to the database server. More...

	doQuery ($sql)
	The DBMS-dependent part of query() More...

	doRollback ($fname)
	Issues the ROLLBACK command to the database server. More...

	escapeLikeInternal ($s)

	fillPreparedArg ($matches)
	preg_callback func for fillPrepared() The arguments should be in $this->preparedArgs and must not be touched while we're doing this. More...

	freePrepared ($prepared)
	Free a prepared query, generated by prepare(). More...

	getDefaultSchemaVars ()
	Get schema variables to use if none have been set via setSchemaVars(). More...

	getLogContext (array $extras=[])
	Create a log context to pass to wfLogDBError or other logging functions. More...

	getReadOnlyReason ()

	getSchemaVars ()
	Get schema variables. More...

	getTransactionProfiler ()

	ignoreErrors ($ignoreErrors=null)
	Turns on (false) or off (true) the automatic generation and sending of a "we're sorry, but there has been a database error" page on database errors. More...

	indexName ($index)
	Get the name of an index in a given table. More...

	installErrorHandler ()

	isTransactableQuery ($sql)
	Determine whether a SQL statement is sensitive to isolation level. More...

	isWriteQuery ($sql)
	Determine whether a query writes to the DB. More...

	makeInsertOptions ($options)
	Helper for DatabaseBase::insert(). More...

	makeUpdateOptions ($options)
	Make UPDATE options for the DatabaseBase::update function. More...

	makeUpdateOptionsArray ($options)
	Make UPDATE options array for DatabaseBase::makeUpdateOptions. More...

	nativeReplace ($table, $rows, $fname)
	REPLACE query wrapper for MySQL and SQLite, which have a native REPLACE statement. More...

	prepare ($sql, $func= 'DatabaseBase::prepare')
	Intended to be compatible with the PEAR::DB wrapper functions. More...

	replaceVars ($ins)
	Database independent variable replacement. More...

	restoreErrorHandler ()

	resultObject ($result)
	Take the result from a query, and wrap it in a ResultWrapper if necessary. More...

	tableNamesWithUseIndexOrJOIN ($tables, $use_index=[], $join_conds=[])
	Get the aliased table name clause for a FROM clause which might have a JOIN and/or USE INDEX clause. More...

Static Protected Member Functions
static	generalizeSQL ($sql)
	Removes most variables from an SQL query and replaces them with X or N for numbers. More...

Protected Attributes
string[]	$allViews = null

	$delimiter = ';'

resource	$fileHandle = null

	$htmlErrors

resource	$mConn = null
	Database connection. More...

	$mDefaultBigSelects = null

	$mDoneWrites = false

	$mFlags

	$mForeign

	$mLastQuery = ''

	$mLBInfo = []

	$mOpened = false

	$mPHPError = false

	$mSchema

	$mSchemaVars = false

	$mServer

array	$mSessionVars = []

	$mTablePrefix

array[]	$mTrxEndCallbacks = []
	List of (callable, method name) More...

array[]	$mTrxIdleCallbacks = []
	List of (callable, method name) More...

int	$mTrxLevel = 0
	Either 1 if a transaction is active or 0 otherwise. More...

array[]	$mTrxPreCommitCallbacks = []
	List of (callable, method name) More...

string	$mTrxShortId = ''
	Either a short hexidecimal string if a transaction is active or "". More...

	$preparedArgs

BagOStuff	$srvCache
	APC cache. More...

bool	$suppressPostCommitCallbacks = false
	Whether to suppress triggering of post-commit callbacks. More...

TransactionProfiler	$trxProfiler

Private Member Functions
	getSqlFilePath ($filename)
	Return a path to the DBMS-specific SQL file if it exists, otherwise default SQL file. More...

Private Attributes
IDatabase null	$lazyMasterHandle
	Lazy handle to the master DB this server replicates from. More...

array	$mNamedLocksHeld = []
	Map of (name => 1) for locks obtained via lock() More...

array	$mTrxAtomicLevels = []
	Array of levels of atomicity within transactions. More...

bool	$mTrxAutomatic = false
	Record if the current transaction was started implicitly due to DBO_TRX being set. More...

bool	$mTrxAutomaticAtomic = false
	Record if the current transaction was started implicitly by DatabaseBase::startAtomic. More...

bool	$mTrxDoneWrites = false
	Record if possible write queries were done in the last transaction started. More...

string	$mTrxFname = null
	Remembers the function name given for starting the most recent transaction via begin(). More...

float	$mTrxSlaveLag = null
	Lag estimate at the time of BEGIN. More...

float null	$mTrxTimestamp = null
	The UNIX time that the transaction started. More...

string[]	$mTrxWriteCallers = []
	Track the write query callers of the current transaction. More...

float	$mTrxWriteDuration = 0.0
	Track the seconds spent in write queries for the current transaction. More...

Detailed Description

Database abstraction object.

Definition at line 32 of file Database.php.

Constructor & Destructor Documentation

DatabaseBase::__construct ( array $params )

Constructor.

FIXME: It is possible to construct a Database object with no associated connection object, by specifying no parameters to __construct(). This feature is deprecated and should be removed.

DatabaseBase subclasses should not be constructed directly in external code. DatabaseBase::factory() should be used instead.

Parameters

array $params Parameters passed from DatabaseBase::factory()

Definition at line 502 of file Database.php.

References $flags, $user, $wgCommandLineMode, $wgDBmwschema, $wgDBprefix, DBO_DEFAULT, DBO_TRX, ObjectCache\getLocalServerInstance(), global, and IDatabase\open().

DatabaseBase::__destruct ( )

Run a few simple sanity checks.

Definition at line 3347 of file Database.php.

References as.

Member Function Documentation

DatabaseBase::__sleep ( )

Called by serialize.

Throw an exception when DB connection is serialized. This causes problems on some database engines because the connection is not restored on unserialize.

Definition at line 557 of file Database.php.

DatabaseBase::__toString ( )

Since: 1.19

Returns: string

Definition at line 3340 of file Database.php.

References $mConn.

DatabaseBase::addIdentifierQuotes ( $s )

Quotes an identifier using backticks or "double quotes" depending on the database type.

MySQL uses backticks while basically everything else uses double quotes. Since MySQL is the odd one out here the double quotes are our generic and we implement backticks in DatabaseMysql.

Parameters

string $s

Returns: string

Definition at line 1982 of file Database.php.

References $s.

Referenced by DatabaseSqlite\duplicateTableStructure(), replaceVars(), and DatabaseMysqlBaseTest\testAddIdentifierQuotes().

DatabaseBase::addQuotes ( $s )

Adds quotes and backslashes.

Parameters

string | Blob $s

Returns: string

Implements IDatabase.

Definition at line 1958 of file Database.php.

References $s, and strencode().

Referenced by buildGroupConcatField(), PopulateRecentChangesSource\buildUpdateCondition(), RefreshImageMetadata\execute(), fillPreparedArg(), RefreshImageMetadata\getConditions(), WatchedItemQueryService\getFromUntilTargetConds(), WatchedItemQueryService\getStartEndConds(), WatchedItemQueryService\getStartFromConds(), WatchedItemQueryService\getUserRelatedConds(), DatabaseMysqlBase\lock(), DatabaseMysqlBase\lockIsFree(), makeList(), DatabaseMysqlBase\masterPosWait(), DatabaseMysqlBase\open(), PopulateContentModel\populatePage(), PopulateContentModel\populateRevisionOrArchive(), replace(), replaceVars(), and DatabaseMysqlBase\unlock().

DatabaseBase::aggregateValue	(	$valuedata,
		$valuename = `'value'`
	)

Return aggregated value alias.

Parameters

array	$valuedata
string	$valuename

Returns: string

Definition at line 1620 of file Database.php.

DatabaseBase::anyChar ( )

Returns a token for buildLike() that denotes a '_' to be used in a LIKE query.

Returns: LikeMatch

Implements IDatabase.

Definition at line 2027 of file Database.php.

DatabaseBase::anyString ( )

Returns a token for buildLike() that denotes a '' to be used in a LIKE query.

Returns: LikeMatch

Implements IDatabase.

Definition at line 2031 of file Database.php.

Referenced by RefreshImageMetadata\getConditions().

DatabaseBase::assertOpen ( )

protected

Make sure isOpen() returns true as a sanity check.

Exceptions

DBUnexpectedError

Definition at line 726 of file Database.php.

References isOpen().

Referenced by begin(), commit(), query(), and rollback().

DatabaseBase::begin ( $fname = __METHOD__ )

final

Begin a transaction.

If a transaction is already in progress, that transaction will be committed before the new transaction is started.

Note that when the DBO_TRX flag is set (which is usually the case for web requests, but not for maintenance scripts), any previous database query will have started a transaction automatically.

Nesting of transactions is not supported. Attempts to nest transactions will cause a warning, unless the current transaction was started automatically because of the DBO_TRX flag.

Parameters

string $fname

Exceptions

DBError

Implements IDatabase.

Definition at line 2627 of file Database.php.

References $fname, $status, assertOpen(), doBegin(), doCommit(), getApproximateLagStatus(), getTransactionProfiler(), pendingWriteQueryDuration(), runOnTransactionIdleCallbacks(), runOnTransactionPreCommitCallbacks(), wfLogDBError(), and wfRandomString().

Referenced by deadlockLoop(), onTransactionPreCommitOrIdle(), SavepointPostgres\query(), query(), startAtomic(), DatabaseTest\testTransactionResolution(), and upsert().

DatabaseBase::bitAnd	(	$fieldLeft,
		$fieldRight
	)

Parameters

string	$fieldLeft
string	$fieldRight

Returns: string

Implements IDatabase.

Definition at line 1628 of file Database.php.

Referenced by WatchedItemQueryService\getExtraDeletedPageLogEntryRelatedCond(), and WatchedItemQueryService\getUserRelatedConds().

DatabaseBase::bitNot ( $field )

Parameters

string $field

Returns: string

Implements IDatabase.

Definition at line 1624 of file Database.php.

DatabaseBase::bitOr	(	$fieldLeft,
		$fieldRight
	)

Parameters

string	$fieldLeft
string	$fieldRight

Returns: string

Implements IDatabase.

Definition at line 1632 of file Database.php.

DatabaseBase::bufferResults ( $buffer = null )

Turns buffering of SQL result sets on (true) or off (false).

Default is "on".

Unbuffered queries are very troublesome in MySQL:

If another query is executed while the first query is being read out, the first query is killed. This means you can't call normal MediaWiki functions while you are reading an unbuffered query result from a normal wfGetDB() connection.
Unbuffered queries cause the MySQL server to use large amounts of memory and to hold broad locks which block other queries.

If you want to limit client-side memory, it's almost always better to split up queries into batches using a LIMIT clause than to switch off buffering.

Parameters

null | bool $buffer

Returns: null|bool The previous value of the flag

Implements IDatabase.

Definition at line 207 of file Database.php.

References $buffer, DBO_NOBUFFER, and wfSetBit().

Referenced by DatabaseMysql\doQuery(), and DatabaseMysqli\doQuery().

DatabaseBase::buildConcat ( $stringList )

Build a concatenation list to feed into a SQL query.

Parameters

array $stringList List of raw SQL expressions; caller is responsible for any quoting

Returns: string

Implements IDatabase.

Definition at line 1636 of file Database.php.

DatabaseBase::buildGroupConcatField	(	$delim,
		$table,
		$field,
		$conds = `''`,
		$join_conds = `[]`
	)

Build a GROUP_CONCAT or equivalent statement for a query.

This is useful for combining a field for several rows into a single string. NULL values will not appear in the output, duplicated values will appear, and the resulting delimiter-separated values have no defined sort order. Code using the results may need to use the PHP unique() or sort() methods.

Parameters

string	$delim	Glue to bind the results together
string \| array	$table	Table name
string	$field	Field name
string \| array	$conds	Conditions
string \| array	$join_conds	Join conditions

Returns: string SQL text

Since: 1.23

Implements IDatabase.

Definition at line 1640 of file Database.php.

References addQuotes(), and selectSQLText().

DatabaseBase::buildLike ( )

LIKE statement wrapper, receives a variable-length argument list with parts of pattern to match containing either string literals that will be escaped or tokens returned by anyChar() or anyString().

Alternatively, the function could be provided with an array of aforementioned parameters.

Example: $dbr->buildLike( 'My_page_title/', $dbr->anyString() ) returns a LIKE clause that searches for subpages of 'My page title'. Alternatively: $pattern = array( 'My_page_title/', $dbr->anyString() ); $query .= $dbr->buildLike( $pattern );

Since: 1.16

Returns: string Fully built LIKE statement

Implements IDatabase.

Definition at line 2007 of file Database.php.

References $params, $s, $value, as, and escapeLikeInternal().

Referenced by RefreshImageMetadata\getConditions().

DatabaseBase::cascadingDeletes ( )

Returns true if this database supports (and uses) cascading deletes.

Returns: bool

Definition at line 319 of file Database.php.

Referenced by dropTable().

DatabaseBase::cleanupTriggers ( )

Returns true if this database supports (and uses) triggers (e.g.

on the page table)

Returns: bool

Definition at line 328 of file Database.php.

DatabaseBase::clearFlag ( $flag )

Clear a flag for this connection.

Parameters

int

$flag

DBO_* constants from Defines.php:

DBO_DEBUG: output some debug info (same as debug())
DBO_NOBUFFER: don't buffer results (inverse of bufferResults())
DBO_TRX: automatically start transactions
DBO_DEFAULT: automatically sets DBO_TRX if not in command line mode and removes it in command line mode
DBO_PERSISTENT: use persistant database connection

Implements IDatabase.

Definition at line 416 of file Database.php.

Referenced by runOnTransactionIdleCallbacks(), DatabaseTest\testTransactionIdle(), and DatabaseTest\testTransactionResolution().

DatabaseBase::clearViewsCache ( )

final

Reset the views process cache set by listViews()

Since: 1.22

Definition at line 2823 of file Database.php.

DatabaseBase::close ( )

Closes a database connection.

if it is open : commits any open transactions

Exceptions

MWException

Returns: bool Operation success. true if already closed.

Implements IDatabase.

Definition at line 698 of file Database.php.

References closeConnection(), commit(), trxLevel(), and wfWarn().

Referenced by DatabaseOracle\__destruct(), LoadBalancer\closeAll(), DatabaseMysqlBase\open(), DatabaseMssql\open(), DatabaseSqlite\open(), DatabaseOracle\open(), DatabaseSqliteTest\testInsertIdType(), DatabaseSqliteTest\testNumFields(), and DatabaseSqliteTest\testUpgrades().

DatabaseBase::closeConnection ( )

abstractprotected

Closes underlying database connection.

Since: 1.20

Returns: bool Whether connection was closed successfully

Referenced by close(), and DatabaseMysqlBase\ping().

DatabaseBase::commit	(	$fname = `__METHOD__`,
		$flush = `''`
	)

final

Commits a transaction previously started using begin().

If no transaction is in progress, a warning is issued.

Nesting of transactions is not supported.

Parameters

string	$fname
string	$flush	Flush flag, set to 'flush' to disable warnings about explicitly committing implicit transactions, or calling commit when no transaction is in progress.

This will trigger an exception if there is an ongoing explicit transaction.

Only set the flush flag if you are sure that these warnings are not applicable, and no explicit transactions are open.

Exceptions

DBUnexpectedError

Implements IDatabase.

Definition at line 2697 of file Database.php.

References assertOpen(), doCommit(), getTransactionProfiler(), pendingWriteQueryDuration(), runOnTransactionIdleCallbacks(), runOnTransactionPreCommitCallbacks(), and wfWarn().

Referenced by close(), LoadBalancer\commitAll(), LoadBalancer\commitMasterChanges(), deadlockLoop(), endAtomic(), getScopedLockAndFlush(), DatabaseMysqlBase\masterPosWait(), onTransactionPreCommitOrIdle(), DatabaseTest\testTransactionResolution(), and upsert().

DatabaseBase::conditional	(	$cond,
		$trueVal,
		$falseVal
	)

Returns an SQL expression for a simple conditional.

This doesn't need to be overridden unless CASE isn't supported in your DBMS.

Parameters

string \| array	$cond	SQL expression which will result in a boolean value
string	$trueVal	SQL expression to return if true
string	$falseVal	SQL expression to return if false

Returns: string SQL fragment

Implements IDatabase.

Definition at line 2341 of file Database.php.

References LIST_AND, and makeList().

DatabaseBase::connectionErrorHandler	(	$errno,
		$errstr
	)

Parameters

int	$errno
string	$errstr

Definition at line 677 of file Database.php.

DatabaseBase::dbSchema ( $schema = null )

Get/set the db schema.

Parameters

string $schema The database schema to set, or omitted to leave it unchanged.

Returns: string The previous db schema.

Implements IDatabase.

Definition at line 243 of file Database.php.

References wfSetVar().

DatabaseBase::deadlockLoop ( )

Perform a deadlock-prone transaction.

This function invokes a callback function to perform a set of write queries. If a deadlock occurs during the processing, the transaction will be rolled back and the callback function will be called again.

Avoid using this method outside of Job or Maintenance classes.

Usage: $dbw->deadlockLoop( callback, ... );

Extra arguments are passed through to the specified callback function. This method requires that no transactions are already active to avoid causing premature commits or exceptions.

Returns whatever the callback function returned on its successful, iteration, or false on error, for example if the retry limit was reached.

Returns: mixed

Exceptions

DBUnexpectedError
Exception

Definition at line 2408 of file Database.php.

References $args, $e, begin(), commit(), rollback(), and wasDeadlock().

DatabaseBase::debug ( $debug = null )

Boolean, controls output of large amounts of debug information.

Parameters

bool | null

$debug

true to enable debugging
false to disable debugging
omitted or null to do nothing

Returns: bool|null Previous value of the flag

Definition at line 203 of file Database.php.

References $debug, DBO_DEBUG, and wfSetBit().

Referenced by DatabaseMssql\doQuery(), and query().

DatabaseBase::decodeBlob ( $b )

Some DBMSs return a special placeholder object representing blob fields in result objects.

Pass the object through this function to return the original string.

Parameters

string | Blob $b

Returns: string

Implements IDatabase.

Definition at line 2979 of file Database.php.

DatabaseBase::decodeExpiry	(	$expiry,
		$format = `TS_MW`
	)

Decode an expiry time into a DBMS independent format.

Parameters

string	$expiry	DB timestamp field value for expiry
int	$format	TS_* constant, defaults to TS_MW

Returns: string

Implements IDatabase.

Definition at line 3313 of file Database.php.

References getInfinity(), and wfTimestamp().

DatabaseBase::delete	(	$table,
		$conds,
		$fname = `__METHOD__`
	)

DELETE query wrapper.

Parameters

array	$table	Table name
string \| array	$conds	Array of conditions. See $conds in IDatabase::select() for the format. Use $conds == "*" to delete all rows
string	$fname	Name of the calling function

Exceptions

DBUnexpectedError

Returns: bool|ResultWrapper

Implements IDatabase.

Definition at line 2244 of file Database.php.

References LIST_AND, makeList(), query(), and tableName().

Referenced by MediaWikiTestCase\resetDB().

DatabaseBase::deleteJoin	(	$delTable,
		$joinTable,
		$delVar,
		$joinVar,
		$conds,
		$fname = `__METHOD__`
	)

DELETE where the condition is a join.

MySQL overrides this to use a multi-table DELETE syntax, in other databases we use sub-selects

For safety, an empty $conds will not delete everything. If you want to delete all rows where the join condition matches, set $conds='*'.

DO NOT put the join condition in $conds.

Parameters

string	$delTable	The table to delete from.
string	$joinTable	The other table.
string	$delVar	The variable to join on, in the first table.
string	$joinVar	The variable to join on, in the second table.
array	$conds	Condition array of field names mapped to variables, ANDed together in the WHERE clause
string	$fname	Calling function name (use METHOD) for logs/profiling

Exceptions

DBUnexpectedError

Implements IDatabase.

Definition at line 2189 of file Database.php.

References $fname, LIST_AND, makeList(), query(), and tableName().

Referenced by DatabaseSqliteTest\testDeleteJoin().

DatabaseBase::doAtomicSection	(		$fname,
		callable	$callback
	)

final

Run a callback to do an atomic set of updates for this database.

The $callback takes the following arguments:

This database object
The value of $fname

If any exception occurs in the callback, then rollback() will be called and the error will be re-thrown. It may also be that the rollback itself fails with an exception before then. In any case, such errors are expected to terminate the request, without any outside caller attempting to catch errors and commit anyway. Note that any rollback undoes all prior atomic section and uncommitted updates, which trashes the current request, requiring an error to be displayed.

This can be an alternative to explicit startAtomic()/endAtomic() calls.

See Also: DatabaseBase::startAtomic; DatabaseBase::endAtomic

Parameters

string	$fname	Caller name (usually METHOD)
callable	$callback	Callback that issues DB updates

Exceptions

DBError
RuntimeException
UnexpectedValueException

Since: 1.27

Implements IDatabase.

Definition at line 2616 of file Database.php.

References $e, endAtomic(), rollback(), and startAtomic().

DatabaseBase::doBegin ( $fname )

protected

Issues the BEGIN command to the database server.

See Also: DatabaseBase::begin()

Parameters

string $fname

Definition at line 2692 of file Database.php.

References query().

Referenced by begin().

DatabaseBase::doCommit ( $fname )

protected

Issues the COMMIT command to the database server.

See Also: DatabaseBase::commit()

Parameters

string $fname

Definition at line 2746 of file Database.php.

References query().

Referenced by begin(), and commit().

DatabaseBase::doneWrites ( )

Returns true if the connection may have been used for write queries.

Should return true if unsure.

Returns: bool

Implements IDatabase.

Definition at line 382 of file Database.php.

References $mDoneWrites.

DatabaseBase::doQuery ( $sql )

abstractprotected

The DBMS-dependent part of query()

Parameters

string $sql SQL query.

Returns: ResultWrapper|bool Result object to feed to fetchObject, fetchRow, ...; or false on failure

Referenced by DatabaseMysqlBase\masterPosWait(), DatabaseMysqlBase\open(), and query().

DatabaseBase::doRollback ( $fname )

protected

Issues the ROLLBACK command to the database server.

See Also: DatabaseBase::rollback()

Parameters

string $fname

Definition at line 2786 of file Database.php.

References query().

Referenced by rollback().

DatabaseBase::dropTable	(	$tableName,
		$fName = `__METHOD__`
	)

Delete a table.

Parameters

string	$tableName
string	$fName

Returns: bool|ResultWrapper

Since: 1.18

Definition at line 3281 of file Database.php.

References cascadingDeletes(), query(), tableExists(), and tableName().

DatabaseBase::duplicateTableStructure	(	$oldName,
		$newName,
		$temporary = `false`,
		$fname = `__METHOD__`
	)

Creates a new table with structure copied from existing table Note that unlike most database abstraction functions, this function does not automatically append database prefix, because it works at a lower abstraction level.

The table names passed to this function shall not be quoted (this function calls addIdentifierQuotes when needed).

Parameters

string	$oldName	Name of table whose structure should be copied
string	$newName	Name of table to be created
bool	$temporary	Whether the new table should be temporary
string	$fname	Calling function name

Exceptions

MWException

Returns: bool True if operation was successful

Definition at line 2808 of file Database.php.

DatabaseBase::encodeBlob ( $b )

Some DBMSs have a special format for inserting into blob fields, they don't allow simple quoted strings to be inserted.

To insert into such a field, pass the data through this function before passing it to IDatabase::insert().

Parameters

string $b

Returns: string

Implements IDatabase.

Definition at line 2975 of file Database.php.

DatabaseBase::encodeExpiry ( $expiry )

Encode an expiry time into the DBMS dependent format.

Parameters

string $expiry Timestamp for expiry, or the 'infinity' string

Returns: string

Implements IDatabase.

Definition at line 3307 of file Database.php.

References getInfinity(), and timestamp().

DatabaseBase::endAtomic ( $fname = __METHOD__ )

final

Ends an atomic section of SQL statements.

Ends the next section of atomic SQL statements and commits the transaction if necessary.

Since: 1.23

See Also: IDatabase::startAtomic

Parameters

string $fname

Exceptions

DBError

Implements IDatabase.

Definition at line 2601 of file Database.php.

References commit().

Referenced by doAtomicSection().

DatabaseBase::escapeLikeInternal ( $s )

protected

Parameters

string $s

Returns: string

Definition at line 2003 of file Database.php.

References $s.

Referenced by buildLike().

DatabaseBase::estimateRowCount	(	$table,
		$vars = `'*'`,
		$conds = `''`,
		$fname = `__METHOD__`,
		$options = `[]`
	)

Estimate the number of rows in dataset.

MySQL allows you to estimate the number of rows that would be returned by a SELECT query, using EXPLAIN SELECT. The estimate is provided using index cardinality statistics, and is notoriously inaccurate, especially when large numbers of rows have recently been added or deleted.

For DBMSs that don't support fast result size estimation, this function will actually perform the SELECT COUNT(*).

Takes the same arguments as IDatabase::select().

Parameters

string	$table	Table name
string	$vars	Unused
array \| string	$conds	Filters on the table
string	$fname	Function name for profiling
array	$options	Options for select

Returns: int Row count

Implements IDatabase.

Definition at line 1311 of file Database.php.

References $fname, $options, $res, IDatabase\fetchRow(), and select().

DatabaseBase::execute	(	$prepared,
		$args = `null`
	)

Execute a prepared query with the various arguments.

Parameters

string	$prepared	The prepared sql
mixed	$args	Either an array here, or put scalars as varargs

Returns: ResultWrapper

Definition at line 978 of file Database.php.

References $args, fillPrepared(), and query().

static DatabaseBase::factory	(	$dbType,
		$p = `[]`
	)

staticfinal

Given a DB type, construct the name of the appropriate child class of DatabaseBase.

This is designed to replace all of the manual stuff like: $class = 'Database' . ucfirst( strtolower( $dbType ) ); as well as validate against the canonical list of DB types we have

This factory function is mostly useful for when you need to connect to a database other than the MediaWiki default (such as for external auth, an extension, et cetera). Do not use this to connect to the MediaWiki database. Example uses in core:

See Also: LoadBalancer::reallyOpenConnection(); ForeignDBRepo::getMasterDB(); WebInstallerDBConnect::execute()

Since: 1.18

Parameters

string	$dbType	A possible DB type
array	$p	An array of options to pass to the constructor. Valid options are: host, user, password, dbname, flags, tablePrefix, schema, driver

Exceptions

MWException If the database driver or extension cannot be found

Returns: DatabaseBase|null DatabaseBase subclass or null

Definition at line 584 of file Database.php.

References as.

Referenced by DBLockManager\getConnection(), SqlBagOStuff\getDB(), ForeignDBRepo\getDBFactory(), DatabaseSqliteMock\newInstance(), DatabaseSqlite\newStandaloneInstance(), MysqlInstaller\openConnection(), SqliteInstaller\openConnection(), MssqlInstaller\openConnection(), PostgresInstaller\openConnectionToAnyDB(), PostgresInstaller\openConnectionWithParams(), LoadBalancer\reallyOpenConnection(), SqliteInstaller\setupDatabase(), MysqlInstaller\setupUser(), MssqlInstaller\submitSettingsForm(), and MysqlInstaller\submitSettingsForm().

DatabaseBase::fieldExists	(	$table,
		$field,
		$fname = `__METHOD__`
	)

Determines whether a field exists in a table.

Parameters

string	$table	Table name
string	$field	Filed to check on that table
string	$fname	Calling function name (optional)

Returns: bool Whether $table has filed $field

Implements IDatabase.

Definition at line 1370 of file Database.php.

References IDatabase\fieldInfo().

DatabaseBase::fieldNamesWithAlias ( $fields )

Gets an array of aliased field names.

Parameters

array $fields Array( [alias] => field )

Returns: string[] See fieldNameWithAlias()

Definition at line 1863 of file Database.php.

Referenced by selectSQLText().

DatabaseBase::fieldNameWithAlias	(	$name,
		$alias = `false`
	)

Get an aliased field name e.g.

fieldName AS newFieldName

Parameters

string	$name	Field name
string \| bool	$alias	Alias (optional)

Returns: string SQL name for aliased field. Will not alias a field to its own name

Definition at line 1849 of file Database.php.

DatabaseBase::fillPrepared	(	$preparedQuery,
		$args
	)

For faking prepared SQL statements on DBs that don't support it directly.

Parameters

string	$preparedQuery	A 'preparable' SQL statement
array	$args	Array of Arguments to fill it with

Returns: string Executable SQL

Definition at line 997 of file Database.php.

References $args.

Referenced by execute().

DatabaseBase::fillPreparedArg ( $matches )

protected

preg_callback func for fillPrepared() The arguments should be in $this->preparedArgs and must not be touched while we're doing this.

Parameters

array $matches

Exceptions

DBUnexpectedError

Returns: string

Definition at line 1014 of file Database.php.

References $matches, addQuotes(), and list.

DatabaseBase::freePrepared ( $prepared )

protected

Free a prepared query, generated by prepare().

Parameters

string $prepared

Definition at line 967 of file Database.php.

DatabaseBase::freeResult ( $res )

Free a result object returned by query() or select().

It's usually not necessary to call this, just use unset() or let the variable holding the result object go out of scope.

Parameters

mixed $res A SQL result

Implements IDatabase.

Definition at line 1045 of file Database.php.

DatabaseBase::functionalIndexes ( )

Returns true if this database can use functional indexes.

Returns: bool

Definition at line 374 of file Database.php.

static DatabaseBase::generalizeSQL ( $sql )

staticprotected

Removes most variables from an SQL query and replaces them with X or N for numbers.

It's only slightly flawed. Don't use for anything important.

Parameters

string $sql A SQL Query

Returns: string

Definition at line 1348 of file Database.php.

Referenced by query().

DatabaseBase::getApproximateLagStatus ( )

Get a slave lag estimate for this server.

Returns: array ('lag': seconds or false on error, 'since': UNIX timestamp of estimate)

Since: 1.27

Definition at line 2925 of file Database.php.

References getLag(), and getLBInfo().

Referenced by begin(), and getSessionLagStatus().

static DatabaseBase::getCacheSetOptions ( IDatabase $db1 )

static

Merge the result of getSessionLagStatus() for several DBs using the most pessimistic values to estimate the lag of any data derived from them in combination.

This is information is useful for caching modules

See Also: WANObjectCache::set(); WANObjectCache::getWithSetCallback()

Parameters

IDatabase	$db1
	IDatabase	...

Returns

array Map of values:

lag: highest lag of any of the DBs or false on error (e.g. replication stopped)
since: oldest UNIX timestamp of any of the DB lag estimates
pending: whether any of the DBs have uncommitted changes

Since: 1.27

Definition at line 2950 of file Database.php.

References $res, $status, as, and false.

Referenced by LocalRepo\checkRedirect(), ChangeTags\listExplicitlyDefinedTags(), ChangeTags\listExtensionActivatedTags(), ChangeTags\listExtensionDefinedTags(), MediaWiki\Interwiki\ClassicInterwikiLookup\load(), User\loadFromCache(), SiteStats\numberingroup(), InfoAction\pageCounts(), MessageBlobStore\recacheMessageBlob(), LocalFile\saveToCache(), and ChangeTags\tagUsageStatistics().

DatabaseBase::getDBname ( )

Get the current DB name.

Returns: string

Implements IDatabase.

Definition at line 1657 of file Database.php.

References $mDBname.

DatabaseBase::getDefaultSchemaVars ( )

protected

Get schema variables to use if none have been set via setSchemaVars().

Override this in derived classes to provide variables for tables.sql and SQL patch files.

Returns: array

Definition at line 3212 of file Database.php.

Referenced by getSchemaVars().

DatabaseBase::getDelimiter ( )

Returns: string Command delimiter used by this database engine

Definition at line 190 of file Database.php.

References $delimiter.

DatabaseBase::getFlag ( $flag )

Returns a boolean whether the flag $flag is set for this connection.

Parameters

int

$flag

DBO_* constants from Defines.php:

DBO_DEBUG: output some debug info (same as debug())
DBO_NOBUFFER: don't buffer results (inverse of bufferResults())
DBO_TRX: automatically start transactions
DBO_PERSISTENT: use persistant database connection

Returns: bool

Implements IDatabase.

Definition at line 420 of file Database.php.

Referenced by DatabaseOracle\doQuery(), query(), runOnTransactionIdleCallbacks(), startAtomic(), DatabaseTest\testTransactionIdle(), and DatabaseTest\testTransactionResolution().

DatabaseBase::getInfinity ( )

Find out when 'infinity' is.

Most DBMSes support this. This is a special keyword for timestamps in PostgreSQL, and works with CHAR(14) as well because "i" sorts after all numbers.

Returns: string

Implements IDatabase.

Definition at line 3303 of file Database.php.

Referenced by decodeExpiry(), and encodeExpiry().

DatabaseBase::getLag ( )

Get slave lag.

Currently supported only by MySQL.

Note that this function will generate a fatal error on many installations. Most callers should use LoadBalancer::safeGetLag() instead.

Returns: int|bool Database replication lag in seconds or false on error

Implements IDatabase.

Definition at line 2967 of file Database.php.

Referenced by getApproximateLagStatus(), and DatabaseMysqlBaseTest\testPtHeartbeat().

DatabaseBase::getLazyMasterHandle ( )

Returns: IDatabase|null

See Also: setLazyMasterHandle()

Since: 1.27

Definition at line 291 of file Database.php.

References $lazyMasterHandle.

Referenced by DatabaseMysqlBase\getMasterServerInfo().

DatabaseBase::getLBInfo ( $name = null )

Get properties passed down from the server info array of the load balancer.

Parameters

string $name The entry of the info array to get, or null to get the whole array

Returns: array|mixed|null

Implements IDatabase.

Definition at line 256 of file Database.php.

References $mLBInfo, and $name.

Referenced by getApproximateLagStatus(), DatabaseMysqlBase\getMasterServerInfo(), getReadOnlyReason(), DatabaseMysqlBase\masterPosWait(), and query().

DatabaseBase::getLogContext ( array $extras = [] )

protected

Create a log context to pass to wfLogDBError or other logging functions.

Parameters

array $extras Additional data to add to context

Returns: array

Definition at line 687 of file Database.php.

Referenced by DatabaseMysqlBase\getLagFromPtHeartbeat(), DatabaseMysqlBase\open(), and reportQueryError().

DatabaseBase::getMasterPos ( )

Get the position of this master.

Returns: DBMasterPos|bool False if this is not a master

Implements IDatabase.

Definition at line 2454 of file Database.php.

DatabaseBase::getProperty ( $name )

General read-only accessor.

Parameters

string $name

Returns: string

Implements IDatabase.

Definition at line 424 of file Database.php.

DatabaseBase::getReadOnlyReason ( )

protected

Returns: string|bool Reason this DB is read-only or false if it is not

Definition at line 3330 of file Database.php.

References getLBInfo().

Referenced by isReadOnly(), and query().

DatabaseBase::getSchemaPath ( )

Return a path to the DBMS-specific schema file, otherwise default to tables.sql.

Returns: string

Definition at line 459 of file Database.php.

References getSqlFilePath().

DatabaseBase::getSchemaVars ( )

protected

Get schema variables.

If none have been set via setSchemaVars(), then use some defaults from the current object.

Returns: array

Definition at line 3196 of file Database.php.

References $mSchemaVars, and getDefaultSchemaVars().

Referenced by replaceVars().

DatabaseBase::getScopedLockAndFlush	(	$lockKey,
		$fname,
		$timeout
	)

Acquire a named lock, flush any transaction, and return an RAII style unlocker object.

This is suitiable for transactions that need to be serialized using cooperative locks, where each transaction can see each others' changes. Any transaction is flushed to clear out stale REPEATABLE-READ snapshot data. Once the returned object falls out of PHP scope, any transaction will be committed and the lock will be released.

If the lock acquisition failed, then no transaction flush happens, and null is returned.

Parameters

string	$lockKey	Name of lock to release
string	$fname	Name of the calling method
int	$timeout	Acquisition timeout in seconds

Returns: ScopedCallback|null

Exceptions

DBUnexpectedError

Since: 1.27

Implements IDatabase.

Definition at line 3232 of file Database.php.

References commit(), lock(), unlock(), and use.

DatabaseBase::getSearchEngine ( )

Get search engine class.

All subclasses of this need to implement this if they wish to use searching.

Returns: string

Definition at line 3299 of file Database.php.

DatabaseBase::getServer ( )

Get the server hostname or IP address.

Returns: string

Implements IDatabase.

Definition at line 1661 of file Database.php.

References $mServer.

Referenced by DatabaseMysqlBase\getApproximateLagStatus(), DatabaseMysqlBase\getMasterServerInfo(), and query().

DatabaseBase::getServerInfo ( )

A string describing the current software version, and possibly other details in a user-friendly way.

Will be listed on Special:Version, etc. Use getServerVersion() to get machine-friendly information.

Returns: string Version information from the database server

Implements IDatabase.

Definition at line 183 of file Database.php.

References IDatabase\getServerVersion().

DatabaseBase::getServerUptime ( )

Determines how long the server has been up STUB.

Returns: int

Implements IDatabase.

Definition at line 2353 of file Database.php.

DatabaseBase::getSessionLagStatus ( )

Get the slave lag when the current transaction started or a general lag estimate if not transaction is active.

This is useful when transactions might use snapshot isolation (e.g. REPEATABLE-READ in innodb), so the "real" lag of that data is this lag plus transaction duration. If they don't, it is still safe to be pessimistic. In AUTO-COMMIT mode, this still gives an indication of the staleness of subsequent reads.

Returns: array ('lag': seconds or false on error, 'since': UNIX timestamp of BEGIN)

Since: 1.27

Implements IDatabase.

Definition at line 2898 of file Database.php.

References getApproximateLagStatus(), and getTransactionLagStatus().

DatabaseBase::getSlavePos ( )

Get the replication position of this slave.

Returns: DBMasterPos|bool False if this is not a slave.

Implements IDatabase.

Definition at line 2449 of file Database.php.

DatabaseBase::getSqlFilePath ( $filename )

private

Return a path to the DBMS-specific SQL file if it exists, otherwise default SQL file.

Parameters

string $filename

Returns: string

Definition at line 443 of file Database.php.

References $IP, IDatabase\getType(), and global.

Referenced by getSchemaPath(), and getUpdateKeysPath().

DatabaseBase::getTransactionLagStatus ( )

Get the slave lag when the current transaction started.

This is useful when transactions might use snapshot isolation (e.g. REPEATABLE-READ in innodb), so the "real" lag of that data is this lag plus transaction duration. If they don't, it is still safe to be pessimistic. This returns null if there is no transaction.

Returns: array|null ('lag': seconds or false on error, 'since': UNIX timestamp of BEGIN)

Since: 1.27

Definition at line 2913 of file Database.php.

References $mTrxSlaveLag, and trxTimestamp().

Referenced by getSessionLagStatus().

DatabaseBase::getTransactionProfiler ( )

protected

Returns: TransactionProfiler

Definition at line 298 of file Database.php.

References $trxProfiler.

Referenced by begin(), commit(), query(), and rollback().

DatabaseBase::getUpdateKeysPath ( )

Return a path to the DBMS-specific update key file, otherwise default to update-keys.sql.

Returns: string

Definition at line 469 of file Database.php.

References getSqlFilePath().

DatabaseBase::getWikiID ( )

Returns: string

Implements IDatabase.

Definition at line 428 of file Database.php.

References $mDBname.

DatabaseBase::ignoreErrors ( $ignoreErrors = null )

protected

Turns on (false) or off (true) the automatic generation and sending of a "we're sorry, but there has been a database error" page on database errors.

Default is on (false). When turned off, the code should use lastErrno() and lastError() to handle the situation as appropriate.

Do not use this function outside of the Database classes.

Parameters

null | bool $ignoreErrors

Returns: bool The previous value of the flag.

Definition at line 227 of file Database.php.

References DBO_IGNORE, and wfSetBit().

Referenced by reportQueryError(), and tableExists().

DatabaseBase::implicitGroupby ( )

Returns true if this database does an implicit sort when doing GROUP BY.

Returns: bool

Implements IDatabase.

Definition at line 351 of file Database.php.

DatabaseBase::implicitOrderby ( )

Returns true if this database does an implicit order by when the column has an index For example: SELECT page_title FROM page LIMIT 1.

Returns: bool

Implements IDatabase.

Definition at line 355 of file Database.php.

DatabaseBase::indexExists	(	$table,
		$index,
		$fname = `__METHOD__`
	)

Determines whether an index exists Usually throws a DBQueryError on failure If errors are explicitly ignored, returns NULL on failure.

Parameters

string	$table
string	$index
string	$fname

Returns: bool|null

Implements IDatabase.

Definition at line 1376 of file Database.php.

References $fname, indexInfo(), and tableExists().

DatabaseBase::indexInfo	(	$table,
		$index,
		$fname = `__METHOD__`
	)

abstract

Get information about an index into an object.

Parameters

string	$table	Table name
string	$index	Index name
string	$fname	Calling function name

Returns: mixed Database-specific index description class or false if the index does not exist

Referenced by indexExists(), and indexUnique().

DatabaseBase::indexName ( $index )

protected

Get the name of an index in a given table.

Parameters

string $index

Returns: string

Definition at line 1943 of file Database.php.

Referenced by DatabaseMysqlBase\indexInfo(), replaceVars(), and DatabaseMysqlBase\useIndexClause().

DatabaseBase::indexUnique	(	$table,
		$index
	)

Determines if a given index is unique.

Parameters

string	$table
string	$index

Returns: bool

Implements IDatabase.

Definition at line 1398 of file Database.php.

References indexInfo().

DatabaseBase::insert	(	$table,
		$a,
		$fname = `__METHOD__`,
		$options = `[]`
	)

INSERT wrapper, inserts an array into a table.

$a may be either:

A single associative array. The array keys are the field names, and the values are the values to insert. The values are treated as data and will be quoted appropriately. If NULL is inserted, this will be converted to a database NULL.
An array with numeric keys, holding a list of associative arrays. This causes a multi-row INSERT on DBMSs that support it. The keys in each subarray must be identical to each other, and in the same order.

Usually throws a DBQueryError on failure. If errors are explicitly ignored, returns success.

$options is an array of options, with boolean options encoded as values with numeric keys, in the same style as $options in IDatabase::select(). Supported options are:

IGNORE: Boolean: if present, duplicate key errors are ignored, and any rows which cause duplicate key errors are not inserted. It's possible to determine how many rows were successfully inserted using IDatabase::affectedRows().

Parameters

string	$table	Table name. This will be passed through DatabaseBase::tableName().
array	$a	Array of rows to insert
string	$fname	Calling function name (use METHOD) for logs/profiling
array	$options	Array of options

Returns: bool

Implements IDatabase.

Definition at line 1418 of file Database.php.

References $fname, $keys, $options, as, makeInsertOptions(), makeList(), query(), and tableName().

Referenced by replace(), and upsert().

DatabaseBase::insertSelect	(	$destTable,
		$srcTable,
		$varMap,
		$conds,
		$fname = `__METHOD__`,
		$insertOptions = `[]`,
		$selectOptions = `[]`
	)

INSERT SELECT wrapper.

Takes data from a SELECT query and inserts it into another table.

Parameters

string	$destTable	The table name to insert into
string \| array	$srcTable	May be either a table name, or an array of table names to include in a join.
array	$varMap	Must be an associative array of the form array( 'dest1' => 'source1', ...). Source items may be literals rather than field names, but strings should be quoted with IDatabase::addQuotes()
array	$conds	Condition array. See $conds in IDatabase::select() for the details of the format of condition arrays. May be "*" to copy the whole table.
string	$fname	The function name of the caller, from METHOD
array	$insertOptions	Options for the INSERT part of the query, see IDatabase::insert() for details.
array	$selectOptions	Options for the SELECT part of the query, see IDatabase::select() for details.

Returns: ResultWrapper

Implements IDatabase.

Definition at line 2262 of file Database.php.

References list, LIST_AND, makeInsertOptions(), makeList(), makeSelectOptions(), query(), and tableName().

DatabaseBase::installErrorHandler ( )

protected

Definition at line 649 of file Database.php.

Referenced by DatabaseMysqlBase\open().

DatabaseBase::isOpen ( )

Is a connection to the database open?

Returns: bool

Implements IDatabase.

Definition at line 408 of file Database.php.

References $mOpened.

Referenced by DatabaseSqlite\__construct(), and assertOpen().

DatabaseBase::isQuotedIdentifier ( $name )

Returns if the given identifier looks quoted or not according to the database convention for quoting identifiers .

Note: Do not use this to determine if untrusted input is safe. A malicious user can trick this function.

Parameters

string $name

Returns: bool

Definition at line 1995 of file Database.php.

References $name.

Referenced by tableName().

DatabaseBase::isReadOnly ( )

Returns: bool Whether this DB is read-only

Since: 1.27

Implements IDatabase.

Definition at line 3323 of file Database.php.

References getReadOnlyReason().

DatabaseBase::isTransactableQuery ( $sql )

protected

Determine whether a SQL statement is sensitive to isolation level.

A SQL statement is considered transactable if its result could vary depending on the transaction isolation level. Operational commands such as 'SET' and 'SHOW' are not considered to be transactable.

Parameters

string $sql

Returns: bool

Definition at line 778 of file Database.php.

Referenced by query().

DatabaseBase::isView ( $name )

Differentiates between a TABLE and a VIEW.

Parameters

string $name Name of the database-structure to test.

Exceptions

MWException

Returns: bool

Since: 1.22

Definition at line 2851 of file Database.php.

Referenced by DatabaseMysqlBaseTest\testIsView().

DatabaseBase::isWriteQuery ( $sql )

protected

Determine whether a query writes to the DB.

Should return true if unsure.

Parameters

string $sql

Returns: bool

Definition at line 765 of file Database.php.

Referenced by query().

DatabaseBase::lastDoneWrites ( )

Returns the last time the connection may have been used for write queries.

Should return a timestamp if unsure.

Returns: int|float UNIX timestamp or false

Since: 1.24

Implements IDatabase.

Definition at line 386 of file Database.php.

DatabaseBase::lastQuery ( )

Return the last query that went through IDatabase::query()

Returns: string

Implements IDatabase.

Definition at line 378 of file Database.php.

References $mLastQuery.

Referenced by DatabaseSqliteMock\query().

DatabaseBase::limitResult	(	$sql,
		$limit,
		$offset = `false`
	)

Construct a LIMIT query with optional offset.

This is used for query pages. The SQL should be adjusted so that only the first $limit rows are returned. If $offset is provided as well, then the first $offset rows should be discarded, and the next $limit rows should be returned. If the result of the query is not ordered, then the rows to be returned are theoretically arbitrary.

$sql is expected to be a SELECT, if that makes a difference.

The version provided by default works in MySQL and SQLite. It will very likely need to be overridden for most other DBMSes.

Parameters

string	$sql	SQL query we will append the limit too
int	$limit	The SQL limit
int \| bool	$offset	The SQL offset (default false)

Exceptions

DBUnexpectedError

Returns: string

Definition at line 2321 of file Database.php.

References $limit.

Referenced by selectSQLText().

DatabaseBase::listTables	(	$prefix = `null`,
		$fname = `__METHOD__`
	)

List all tables on the database.

Parameters

string	$prefix	Only show tables with this prefix, e.g. mw_
string	$fname	Calling function name

Exceptions

MWException

Returns: array

Implements IDatabase.

Definition at line 2815 of file Database.php.

Referenced by MediaWikiTestCase\listTables().

DatabaseBase::listViews	(	$prefix = `null`,
		$fname = `__METHOD__`
	)

Lists all the VIEWs in the database.

For caching purposes the list of all views should be stored in $this->allViews. The process cache can be cleared with clearViewsCache()

Parameters

string	$prefix	Only show VIEWs with this prefix, eg. unit_test_
string	$fname	Name of calling function

Exceptions

MWException

Returns: array

Since: 1.22

Definition at line 2839 of file Database.php.

Referenced by MediaWikiTestCase\listTables(), and DatabaseMysqlBaseTest\testListviews().

DatabaseBase::lock	(	$lockName,
		$method,
		$timeout = `5`
	)

Acquire a named lock.

Named locks are not related to transactions

Parameters

string	$lockName	Name of lock to aquire
string	$method	Name of the calling method
int	$timeout	Acquisition timeout in seconds

Returns: bool

Implements IDatabase.

Definition at line 3220 of file Database.php.

Referenced by getScopedLockAndFlush().

DatabaseBase::lockIsFree	(	$lockName,
		$method
	)

Check to see if a named lock is available (non-blocking)

Parameters

string	$lockName	Name of lock to poll
string	$method	Name of method calling us

Returns: bool

Since: 1.20

Implements IDatabase.

Definition at line 3216 of file Database.php.

DatabaseBase::lockTables	(	$read,
		$write,
		$method,
		$lowPriority = `true`
	)

Lock specific tables.

Parameters

array	$read	Array of tables to lock for read access
array	$write	Array of tables to lock for write access
string	$method	Name of caller
bool	$lowPriority	Whether to indicate writes to be LOW PRIORITY

Returns: bool

Definition at line 3260 of file Database.php.

DatabaseBase::lowPriorityOption ( )

A string to insert into queries to show that they're low-priority, like MySQL's LOW_PRIORITY.

If no such feature exists, return an empty string and nothing bad should happen.

Returns: string Returns the text of the low priority option if it is supported, or a blank string otherwise

Definition at line 2240 of file Database.php.

Referenced by makeUpdateOptionsArray().

DatabaseBase::makeGroupByWithHaving ( $options )

Returns an optional GROUP BY with an optional HAVING.

Parameters

array $options Associative array of options

Returns: string

See Also: DatabaseBase::select()

Since: 1.21

Definition at line 1194 of file Database.php.

References $options, LIST_AND, and makeList().

Referenced by makeSelectOptions(), and DatabaseMssql\makeSelectOptions().

DatabaseBase::makeInsertOptions ( $options )

protected

Helper for DatabaseBase::insert().

Parameters

array $options

Returns: string

Definition at line 1414 of file Database.php.

References $options.

Referenced by insert(), and insertSelect().

DatabaseBase::makeList	(	$a,
		$mode = `LIST_COMMA`
	)

Makes an encoded list of strings from an array.

Parameters

array	$a	Containing the data
int	$mode	Constant LIST_COMMA: Comma separated, no field names LIST_AND: ANDed WHERE clause (without the WHERE). See the documentation for $conds in IDatabase::select(). LIST_OR: ORed WHERE clause (without the WHERE) LIST_SET: Comma separated with field names, like a SET clause LIST_NAMES: Comma separated field names

Exceptions

MWException|DBUnexpectedError

Returns: string

Implements IDatabase.

Definition at line 1518 of file Database.php.

References $value, addQuotes(), as, LIST_AND, LIST_NAMES, LIST_OR, and LIST_SET.

Referenced by conditional(), delete(), DatabaseMysqlBase\deleteJoin(), deleteJoin(), WatchedItemQueryService\getExtraDeletedPageLogEntryRelatedCond(), WatchedItemQueryService\getFromUntilTargetConds(), DatabaseMysqlBase\getHeartbeatData(), WatchedItemQueryService\getStartFromConds(), WatchedItemQueryService\getWatchedItemsWithRCInfoQueryConds(), insert(), insertSelect(), makeGroupByWithHaving(), makeWhereFrom2d(), nativeReplace(), selectSQLText(), update(), DatabaseMysqlBase\upsert(), and upsert().

DatabaseBase::makeOrderBy ( $options )

Returns an optional ORDER BY.

Parameters

array $options Associative array of options

Returns: string

See Also: DatabaseBase::select()

Since: 1.21

Definition at line 1220 of file Database.php.

References $options.

Referenced by makeSelectOptions(), and DatabaseMssql\makeSelectOptions().

DatabaseBase::makeSelectOptions ( $options )

Returns an optional USE INDEX clause to go after the table, and a string to go at the end of the query.

Parameters

array $options Associative array of options to be turned into an SQL query, valid keys are listed in the function.

Returns: array

See Also: DatabaseBase::select()

Definition at line 1110 of file Database.php.

References $options, as, makeGroupByWithHaving(), makeOrderBy(), and useIndexClause().

Referenced by insertSelect(), and selectSQLText().

DatabaseBase::makeUpdateOptions ( $options )

protected

Make UPDATE options for the DatabaseBase::update function.

Parameters

array $options The options passed to DatabaseBase::update

Returns: string

Definition at line 1500 of file Database.php.

References $options, and makeUpdateOptionsArray().

Referenced by DatabaseMssql\update(), and update().

DatabaseBase::makeUpdateOptionsArray ( $options )

protected

Make UPDATE options array for DatabaseBase::makeUpdateOptions.

Parameters

array $options

Returns: array

Definition at line 1476 of file Database.php.

References $options, and lowPriorityOption().

Referenced by makeUpdateOptions().

DatabaseBase::makeWhereFrom2d	(	$data,
		$baseKey,
		$subKey
	)

Build a partial where clause from a 2-d array such as used for LinkBatch.

The keys on each level may be either integers or strings.

Parameters

array	$data	Organized as 2-d array(baseKeyVal => array(subKeyVal => [ignored], ...), ...)
string	$baseKey	Field name to match the base-level keys to (eg 'pl_namespace')
string	$subKey	Field name to match the sub-level keys to (eg 'pl_title')

Returns: string|bool SQL fragment, or false if no items in array

Implements IDatabase.

Definition at line 1593 of file Database.php.

References $base, as, LIST_AND, LIST_OR, and makeList().

DatabaseBase::masterPosWait	(	DBMasterPos	$pos,
			$timeout
	)

Wait for the slave to catch up to a given master position.

Parameters

DBMasterPos	$pos
int	$timeout	The maximum number of seconds to wait for synchronisation

Returns: int|null Zero if the slave was past that position already, greater than zero if we waited for some period of time, less than zero if it timed out, and null on error

Implements IDatabase.

Definition at line 2444 of file Database.php.

DatabaseBase::maxListLen ( )

Return the maximum number of items allowed in a list, or 0 for unlimited.

Returns: int

Implements IDatabase.

Definition at line 2971 of file Database.php.

DatabaseBase::namedLocksEnqueue ( )

Check to see if a named lock used by lock() use blocking queues.

Returns: bool

Since: 1.26

Implements IDatabase.

Definition at line 3247 of file Database.php.

DatabaseBase::nativeReplace	(	$table,
		$rows,
		$fname
	)

protected

REPLACE query wrapper for MySQL and SQLite, which have a native REPLACE statement.

Parameters

string	$table	Table name
array \| string	$rows	Row(s) to insert
string	$fname	Caller function name

Returns: ResultWrapper

Definition at line 2111 of file Database.php.

References $fname, as, makeList(), query(), and tableName().

Referenced by DatabaseMysqlBase\replace(), and DatabaseSqlite\replace().

DatabaseBase::nextSequenceValue ( $seqName )

Returns an appropriately quoted sequence value for inserting a new row.

MySQL has autoincrement fields, so this is just NULL. But the PostgreSQL subclass will return an integer, and save the value for insertId()

Any implementation of this function should not involve reusing sequence numbers created for rolled-back transactions. See http://bugs.mysql.com/bug.php?id=30767 for details.

Parameters

string $seqName

Returns: null|int

Implements IDatabase.

Definition at line 2035 of file Database.php.

DatabaseBase::onTransactionIdle ( callable $callback )

final

Run a callback as soon as there is no transaction pending.

If there is a transaction and it is rolled back, then the callback is cancelled. Queries in the function will run in AUTO-COMMIT mode unless there are begin() calls. Callbacks must commit any transactions that they begin.

This is useful for updates to different systems or when separate transactions are needed. For example, one might want to enqueue jobs into a system outside the database, but only after the database is updated so that the jobs will see the data when they actually run. It can also be used for updates that easily cause deadlocks if locks are held too long.

Updates will execute in the order they were enqueued.

The callback takes one argument: How the transaction ended (IDatabase::TRIGGER_COMMIT or IDatabase::TRIGGER_IDLE)

Parameters

callable $callback

Since: 1.20

Implements IDatabase.

Definition at line 2470 of file Database.php.

References runOnTransactionIdleCallbacks(), and wfGetCaller().

Referenced by DatabaseTest\testTransactionIdle().

DatabaseBase::onTransactionPreCommitOrIdle ( callable $callback )

final

Run a callback before the current transaction commits or now if there is none.

If there is a transaction and it is rolled back, then the callback is cancelled. Callbacks must not start nor commit any transactions. If no transaction is active, then a transaction will wrap the callback.

This is useful for updates that easily cause deadlocks if locks are held too long but where atomicity is strongly desired for these updates and some related updates.

Updates will execute in the order they were enqueued.

Parameters

callable $callback

Since: 1.22

Implements IDatabase.

Definition at line 2477 of file Database.php.

References $e, begin(), commit(), rollback(), and wfGetCaller().

DatabaseBase::onTransactionResolution ( callable $callback )

final

Run a callback as soon as the current transaction commits or rolls back.

An error is thrown if no transaction is pending. Queries in the function will run in AUTO-COMMIT mode unless there are begin() calls. Callbacks must commit any transactions that they begin.

This is useful for combining cooperative locks and DB transactions.

The callback takes one argument: How the transaction ended (IDatabase::TRIGGER_COMMIT or IDatabase::TRIGGER_ROLLBACK)

Parameters

callable $callback

Returns: mixed

Since: 1.28

Implements IDatabase.

Definition at line 2463 of file Database.php.

References wfGetCaller().

Referenced by DatabaseTest\testTransactionResolution().

DatabaseBase::patchPath ( $patch )

Get the full path of a patch file.

Originally based on archive() from updaters.inc. Keep in mind this always returns a patch, as it fails back to MySQL if no DB-specific patch can be found

Parameters

string $patch The name of the patch, like patch-something.sql

Returns: string Full path to patch file

Definition at line 3040 of file Database.php.

References $IP, IDatabase\getType(), and global.

DatabaseBase::pendingWriteCallers ( )

Get the list of method names that did write queries for this transaction.

Returns: array

Since: 1.27

Implements IDatabase.

Definition at line 404 of file Database.php.

DatabaseBase::pendingWriteQueryDuration ( )

Get the time spend running write queries for this transaction.

High times could be due to scanning, updates, locking, and such

Returns: float|bool Returns false if not transaction is active

Since: 1.26

Implements IDatabase.

Definition at line 400 of file Database.php.

Referenced by LoadBalancer\approveMasterChanges(), begin(), and commit().

DatabaseBase::ping ( )

Ping the server and try to reconnect if it there is no connection.

Returns: bool Success or failure

Implements IDatabase.

Definition at line 2893 of file Database.php.

Referenced by LoadBalancer\pingAll(), and query().

DatabaseBase::prepare	(	$sql,
		$func = `'DatabaseBase::prepare'`
	)

protected

Intended to be compatible with the PEAR::DB wrapper functions.

http://pear.php.net/manual/en/package.database.db.intro-execute.php

? = scalar value, quoted as necessary ! = raw SQL bit (a function for instance) & = filename; reads the file and inserts as a blob (we don't use this though...)

Parameters

string	$sql
string	$func

Returns: array

Definition at line 955 of file Database.php.

DatabaseBase::query	(	$sql,
		$fname = `__METHOD__`,
		$tempIgnore = `false`
	)

Run an SQL query and return the result.

Normally throws a DBQueryError on failure. If errors are ignored, returns false instead.

In new code, the query wrappers select(), insert(), update(), delete(), etc. should be used where possible, since they give much better DBMS independence and automatically quote or validate user input in a variety of contexts. This function is generally only useful for queries which are explicitly DBMS-dependent and are unsupported by the query wrappers, such as CREATE TABLE.

However, the query wrappers themselves should call this function.

Parameters

string	$sql	SQL query
string	$fname	Name of the calling function, for profiling/SHOW PROCESSLIST comment (you can use METHOD or add some extra info)
bool	$tempIgnore	Whether to avoid throwing an exception on errors... maybe best to catch the exception instead?

Exceptions

MWException

Returns: bool|ResultWrapper True for a successful write query, ResultWrapper object for a successful read query, or false on failure if $tempIgnore set

Implements IDatabase.

Definition at line 783 of file Database.php.

References $fname, $mTrxLevel, $res, $ret, $wgUser, IDatabase\affectedRows(), assertOpen(), begin(), ScopedCallback\consume(), DBO_TRX, debug(), doQuery(), generalizeSQL(), getFlag(), getLBInfo(), getReadOnlyReason(), getServer(), getTransactionProfiler(), global, Profiler\instance(), isTransactableQuery(), isWriteQuery(), IDatabase\lastErrno(), IDatabase\lastError(), ping(), MWDebug\query(), MWDebug\queryTime(), reportQueryError(), resultObject(), wasErrorReissuable(), wfBacktrace(), wfDebug(), wfDebugLog(), and writesOrCallbacksPending().

DatabaseBase::realTimestamps ( )

Returns true if this database uses timestamps rather than integers.

Returns: bool

Definition at line 347 of file Database.php.

DatabaseBase::replace	(	$table,
		$uniqueIndexes,
		$rows,
		$fname = `__METHOD__`
	)

REPLACE query wrapper.

REPLACE is a very handy MySQL extension, which functions like an INSERT except that when there is a duplicate key error, the old row is deleted and the new row is inserted in its place.

We simulate this with standard SQL with a DELETE followed by INSERT. To perform the delete, we need to know what the unique indexes are so that we know how to find the conflicting rows.

It may be more efficient to leave off unique indexes which are unlikely to collide. However if you do this, you run the risk of encountering errors which wouldn't have occurred in MySQL.

Parameters

string	$table	The table to replace the row(s) in.
array	$uniqueIndexes	Is an array of indexes. Each element may be either a field name or an array of field names
array	$rows	Can be either a single row to insert, or multiple rows, in the same format as for IDatabase::insert()
string	$fname	Calling function name (use METHOD) for logs/profiling

Implements IDatabase.

Definition at line 2053 of file Database.php.

References $fname, addQuotes(), as, insert(), query(), and tableName().

DatabaseBase::replaceVars ( $ins )

protected

Database independent variable replacement.

Replaces a set of variables in an SQL statement with their contents as given by $this->getSchemaVars().

Supports '{$var}' {$var} and / *$var* / (without the spaces) style variables.

'{$var}' should be used for text and is passed through the database's addQuotes method.
{$var} should be used for identifiers (e.g. table and database names). It is passed through the database's addIdentifierQuotes method which can be overridden if the database uses something other than backticks.
/ *_* / or / *$wgDBprefix* / passes the name that follows through the database's tableName method.
/ i / passes the name that follows through the database's indexName method.
In all other cases, / *$var* / is left unencoded. Except for table options, its use should be avoided. In 1.24 and older, string encoding was applied.

Parameters

string $ins SQL statement to replace variables in

Returns: string The new SQL statement with variables replaced

Definition at line 3158 of file Database.php.

References $vars, addIdentifierQuotes(), addQuotes(), getSchemaVars(), indexName(), tableName(), and use.

Referenced by sourceStream().

DatabaseBase::reportConnectionError ( $error = 'Unknown error' )

Parameters

string $error Fallback error message, used if none is given by DB

Exceptions

DBConnectionError

Implements IDatabase.

Definition at line 739 of file Database.php.

References IDatabase\lastError().

Referenced by DatabaseMysqlBase\open().

DatabaseBase::reportQueryError	(	$error,
		$errno,
		$sql,
		$fname,
		$tempIgnore = `false`
	)

Report a query error.

Log the error, and if neither the object ignore flag nor the $tempIgnore flag is set, throw a DBQueryError.

Parameters

string	$error
int	$errno
string	$sql
string	$fname
bool	$tempIgnore

Exceptions

DBQueryError

Implements IDatabase.

Definition at line 921 of file Database.php.

References $fname, getLogContext(), ignoreErrors(), wfDebug(), and wfLogDBError().

Referenced by query().

DatabaseBase::restoreErrorHandler ( )

protected

Returns: bool|string

Definition at line 658 of file Database.php.

Referenced by DatabaseMysqlBase\open().

DatabaseBase::resultObject ( $result )

protected

Take the result from a query, and wrap it in a ResultWrapper if necessary.

Boolean values are passed through as is, to indicate success of write queries or failure.

Once upon a time, DatabaseBase::query() returned a bare MySQL result resource, and it was necessary to call this function to convert it to a wrapper. Nowadays, raw database objects are never exposed to external callers, so this is unnecessary in external code.

Parameters

bool | ResultWrapper | resource | object $result

Returns: bool|ResultWrapper

Definition at line 2880 of file Database.php.

Referenced by query().

DatabaseBase::rollback	(	$fname = `__METHOD__`,
		$flush = `''`
	)

final

Rollback a transaction previously started using begin().

If no transaction is in progress, a warning is issued.

No-op on non-transactional databases.

Parameters

string	$fname
string	$flush	Flush flag, set to 'flush' to disable warnings about calling rollback when no transaction is in progress. This will silently break any ongoing explicit transaction. Only set the flush flag if you are sure that it is safe to ignore these warnings in your context.

Exceptions

DBUnexpectedError

Since: 1.23 Added $flush parameter

Implements IDatabase.

Definition at line 2753 of file Database.php.

References assertOpen(), doRollback(), getTransactionProfiler(), runOnTransactionIdleCallbacks(), and wfWarn().

Referenced by deadlockLoop(), doAtomicSection(), onTransactionPreCommitOrIdle(), runOnTransactionIdleCallbacks(), DatabaseTest\testTransactionResolution(), and upsert().

DatabaseBase::runOnTransactionIdleCallbacks ( $trigger )

Actually run and consume any "on transaction idle/resolution" callbacks.

This method should not be used outside of Database/LoadBalancer

Parameters

integer $trigger IDatabase::TRIGGER_* constant

Since: 1.20

Definition at line 2513 of file Database.php.

References $e, as, clearFlag(), DBO_TRX, getFlag(), list, MWExceptionHandler\logException(), rollback(), setFlag(), and trxLevel().

Referenced by begin(), commit(), onTransactionIdle(), rollback(), and LoadBalancer\runMasterPostCommitCallbacks().

DatabaseBase::runOnTransactionPreCommitCallbacks ( )

Actually run and consume any "on transaction pre-commit" callbacks.

This method should not be used outside of Database/LoadBalancer

Since: 1.22

Definition at line 2564 of file Database.php.

References $e, $mTrxPreCommitCallbacks, as, list, and MWExceptionHandler\logException().

Referenced by begin(), commit(), and LoadBalancer\runMasterPreCommitCallbacks().

DatabaseBase::searchableIPs ( )

Returns true if this database can do a native search on IP columns e.g.

this works as expected: .. WHERE rc_ip = '127.42.12.102/32';

Returns: bool

Definition at line 365 of file Database.php.

DatabaseBase::select	(	$table,
		$vars,
		$conds = `''`,
		$fname = `__METHOD__`,
		$options = `[]`,
		$join_conds = `[]`
	)

Execute a SELECT query constructed using the various parameters provided.

See below for full details of the parameters.

Parameters

string \| array	$table	Table name
string \| array	$vars	Field names
string \| array	$conds	Conditions
string	$fname	Caller function name
array	$options	Query options
array	$join_conds	Join conditions
string \| array	$table	May be either an array of table names, or a single string holding a table name. If an array is given, table aliases can be specified, for example:

array( 'a' => 'user' )

This includes the user table in the query, with the alias "a" available for use in field names (e.g. a.user_name).

All of the table names given here are automatically run through DatabaseBase::tableName(), which causes the table prefix (if any) to be added, and various other table name mappings to be performed.

Do not use untrusted user input as a table name. Alias names should not have characters outside of the Basic multilingual plane.

Parameters

string | array $vars May be either a field name or an array of field names. The field names can be complete fragments of SQL, for direct inclusion into the SELECT query. If an array is given, field aliases can be specified, for example:

array( 'maxrev' => 'MAX(rev_id)' )

This includes an expression with the alias "maxrev" in the query.

If an expression is given, care must be taken to ensure that it is DBMS-independent.

Untrusted user input must not be passed to this parameter.

Parameters

string | array $conds May be either a string containing a single condition, or an array of conditions. If an array is given, the conditions constructed from each element are combined with AND.

Array elements may take one of two forms:

Elements with a numeric key are interpreted as raw SQL fragments.
Elements with a string key are interpreted as equality conditions, where the key is the field name.
- If the value of such an array element is a scalar (such as a string), it will be treated as data and thus quoted appropriately. If it is null, an IS NULL clause will be added.
- If the value is an array, an IN (...) clause will be constructed from its non-null elements, and an IS NULL clause will be added if null is present, such that the field may match any of the elements in the array. The non-null elements will be quoted.

Note that expressions are often DBMS-dependent in their syntax. DBMS-independent wrappers are provided for constructing several types of expression commonly used in condition queries. See:

Untrusted user input is safe in the values of string keys, however untrusted input must not be used in the array key names or in the values of numeric keys. Escaping of untrusted input used in values of numeric keys should be done via IDatabase::addQuotes()

Parameters

string | array $options Optional: Array of query options. Boolean options are specified by including them in the array as a string value with a numeric key, for example:

array( 'FOR UPDATE' )

The supported options are:

OFFSET: Skip this many rows at the start of the result set. OFFSET with LIMIT can theoretically be used for paging through a result set, but this is discouraged in MediaWiki for performance reasons.
LIMIT: Integer: return at most this many rows. The rows are sorted and then the first rows are taken until the limit is reached. LIMIT is applied to a result set after OFFSET.
FOR UPDATE: Boolean: lock the returned rows so that they can't be changed until the next COMMIT.
DISTINCT: Boolean: return only unique result rows.
GROUP BY: May be either an SQL fragment string naming a field or expression to group by, or an array of such SQL fragments.
HAVING: May be either an string containing a HAVING clause or an array of conditions building the HAVING clause. If an array is given, the conditions constructed from each element are combined with AND.
ORDER BY: May be either an SQL fragment giving a field name or expression to order by, or an array of such SQL fragments.
USE INDEX: This may be either a string giving the index name to use for the query, or an array. If it is an associative array, each key gives the table name (or alias), each value gives the index name to use for that table. All strings are SQL fragments and so should be validated by the caller.
EXPLAIN: In MySQL, this causes an EXPLAIN SELECT query to be run, instead of SELECT.

And also the following boolean MySQL extensions, see the MySQL manual for documentation:

LOCK IN SHARE MODE
STRAIGHT_JOIN
HIGH_PRIORITY
SQL_BIG_RESULT
SQL_BUFFER_RESULT
SQL_SMALL_RESULT
SQL_CALC_FOUND_ROWS
SQL_CACHE
SQL_NO_CACHE

Parameters

string | array $join_conds Optional associative array of table-specific join conditions. In the most common case, this is unnecessary, since the join condition can be in $conds. However, it is useful for doing a LEFT JOIN.

The key of the array contains the table name or alias. The value is an array with two elements, numbered 0 and 1. The first gives the type of join, the second is the same as the $conds parameter. Thus it can be an SQL fragment, or an array where the string keys are equality and the numeric keys are SQL fragments all AND'd together. For example:

array( 'page' => array( 'LEFT JOIN', 'page_latest=rev_id' ) )

Returns: ResultWrapper|bool If the query returned no rows, a ResultWrapper with no rows in it will be returned. If there was a query error, a DBQueryError exception will be thrown, except if the "ignore errors" option was set, in which case false will be returned.

Implements IDatabase.

Definition at line 1233 of file Database.php.

References $fname, $options, $vars, query(), and selectSQLText().

Referenced by MediaWikiTestCase\assertSelect(), DatabaseMysqlBase\estimateRowCount(), estimateRowCount(), RefreshImageMetadata\execute(), DatabaseSqlite\listTables(), PopulateContentModel\populatePage(), PopulateContentModel\populateRevisionOrArchive(), selectField(), selectFieldValues(), selectRow(), and DatabaseSqliteTest\testNumFields().

DatabaseBase::selectDB ( $db )

Change the current database.

Parameters

string $db

Returns: bool Success or failure

Implements IDatabase.

Definition at line 1648 of file Database.php.

Referenced by DatabaseMysqlBase\open().

DatabaseBase::selectField	(	$table,
		$var,
		$cond = `''`,
		$fname = `__METHOD__`,
		$options = `[]`
	)

A SELECT wrapper which returns a single field from a single result row.

Usually throws a DBQueryError on failure. If errors are explicitly ignored, returns false on failure.

If no result rows are returned from the query, false is returned.

Parameters

string \| array	$table	Table name. See IDatabase::select() for details.
string	$var	The field name to select. This must be a valid SQL fragment: do not use unvalidated user input.
string \| array	$cond	The condition array. See IDatabase::select() for details.
string	$fname	The function name of the caller.
string \| array	$options	The query options. See IDatabase::select() for details.

Returns: bool|mixed The value from the field, or false on failure.

Implements IDatabase.

Definition at line 1048 of file Database.php.

References $fname, $options, $res, IDatabase\fetchRow(), IDatabase\numRows(), and select().

Referenced by DatabasePostgres\fieldType(), DatabaseMysqlBase\getServerVersion(), DatabaseMysqlBase\setBigSelects(), DatabaseSqliteTest\testDuplicateTableStructure(), DatabaseSqliteTest\testDuplicateTableStructureVirtual(), and LocalFileMoveBatch\verifyDBUpdates().

DatabaseBase::selectFieldValues	(	$table,
		$var,
		$cond = `''`,
		$fname = `__METHOD__`,
		$options = `[]`,
		$join_conds = `[]`
	)

Definition at line 1075 of file Database.php.

References $fname, $options, $res, as, and select().

DatabaseBase::selectRow	(	$table,
		$vars,
		$conds,
		$fname = `__METHOD__`,
		$options = `[]`,
		$join_conds = `[]`
	)

Single row SELECT wrapper.

Equivalent to IDatabase::select(), except that a single row object is returned. If the query returns no rows, false is returned.

Parameters

string \| array	$table	Table name
string \| array	$vars	Field names
array	$conds	Conditions
string	$fname	Caller function name
string \| array	$options	Query options
array \| string	$join_conds	Join conditions

Returns: stdClass|bool

Implements IDatabase.

Definition at line 1291 of file Database.php.

References $fname, $options, $res, $vars, array(), IDatabase\fetchObject(), IDatabase\numRows(), and select().

Referenced by DatabaseSqlite\indexUnique().

DatabaseBase::selectRowCount	(	$tables,
		$vars = `'*'`,
		$conds = `''`,
		$fname = `__METHOD__`,
		$options = `[]`,
		$join_conds = `[]`
	)

Get the number of rows in dataset.

This is useful when trying to do COUNT(*) but with a LIMIT for performance.

Takes the same arguments as IDatabase::select().

Since: 1.27 Added $join_conds parameter

Parameters

array \| string	$tables	Table names
string	$vars	Unused
array \| string	$conds	Filters on the table
string	$fname	Function name for profiling
array	$options	Options for select
array	$join_conds	Join conditions (since 1.27)

Returns: int Row count

Implements IDatabase.

Definition at line 1325 of file Database.php.

References $fname, $options, $res, $tables, IDatabase\fetchRow(), query(), and selectSQLText().

DatabaseBase::selectSQLText	(	$table,
		$vars,
		$conds = `''`,
		$fname = `__METHOD__`,
		$options = `[]`,
		$join_conds = `[]`
	)

The equivalent of IDatabase::select() except that the constructed SQL is returned, instead of being immediately executed.

This can be useful for doing UNION queries, where the SQL text of each query is needed. In general, however, callers outside of Database classes should just use select().

Parameters

string \| array	$table	Table name
string \| array	$vars	Field names
string \| array	$conds	Conditions
string	$fname	Caller function name
string \| array	$options	Query options
string \| array	$join_conds	Join conditions

Returns: string SQL query string.

See Also: IDatabase::select()

Implements IDatabase.

Definition at line 1240 of file Database.php.

References $from, $options, $vars, array(), fieldNamesWithAlias(), limitResult(), list, LIST_AND, makeList(), makeSelectOptions(), and tableNamesWithUseIndexOrJOIN().

Referenced by DatabaseSqlite\buildGroupConcatField(), buildGroupConcatField(), select(), and selectRowCount().

DatabaseBase::serverIsReadOnly ( )

Returns: bool Whether the DB is marked as read-only server-side

Since: 1.28

Implements IDatabase.

Definition at line 2459 of file Database.php.

DatabaseBase::setBigSelects ( $value = true )

Allow or deny "big selects" for this session only.

This is done by setting the sql_big_selects session variable.

This is a MySQL-specific feature.

Parameters

bool | string $value True for allow, false for deny, or "default" to restore the initial value

Implements IDatabase.

Definition at line 3319 of file Database.php.

DatabaseBase::setFileHandle ( $fh )

Set the filehandle to copy write statements to.

Parameters

resource $fh File handle

Definition at line 252 of file Database.php.

DatabaseBase::setFlag ( $flag )

Set a flag for this connection.

Parameters

int

$flag

DBO_* constants from Defines.php:

DBO_DEBUG: output some debug info (same as debug())
DBO_NOBUFFER: don't buffer results (inverse of bufferResults())
DBO_TRX: automatically start transactions
DBO_DEFAULT: automatically sets DBO_TRX if not in command line mode and removes it in command line mode
DBO_PERSISTENT: use persistant database connection

Implements IDatabase.

Definition at line 412 of file Database.php.

Referenced by DatabaseUpdater\__construct(), DatabaseOracle\open(), runOnTransactionIdleCallbacks(), DatabaseTest\testTransactionIdle(), and DatabaseTest\testTransactionResolution().

DatabaseBase::setLazyMasterHandle ( IDatabase $conn )

Set a lazy-connecting DB handle to the master DB (for replication status purposes)

Parameters

IDatabase $conn

Since: 1.27

Definition at line 282 of file Database.php.

DatabaseBase::setLBInfo	(	$name,
		$value = `null`
	)

Set the LB info array, or a member of it.

If called with one parameter, the LB info array is set to that parameter. If it is called with two parameters, the member with the given name is set to the given value.

Parameters

string	$name
array	$value

Implements IDatabase.

Definition at line 268 of file Database.php.

References $name, and $value.

Referenced by DatabaseMysqlBaseTest\testPtHeartbeat().

DatabaseBase::setPostCommitCallbackSupression ( $suppress )

final

Whether to disable running of post-commit callbacks.

This method should not be used outside of Database/LoadBalancer

Parameters

bool $suppress

Since: 1.28

Definition at line 2501 of file Database.php.

Referenced by LoadBalancer\runMasterPostCommitCallbacks(), and LoadBalancer\runMasterPreCommitCallbacks().

DatabaseBase::setSchemaVars ( $vars )

Set variables to be used in sourceFile/sourceStream, in preference to the ones in $GLOBALS.

If an array is set here, $GLOBALS will not be used at all. If it's set to false, $GLOBALS will be used.

Parameters

bool | array $vars Mapping variable name to value.

Implements IDatabase.

Definition at line 3051 of file Database.php.

References $vars.

DatabaseBase::setSessionOptions ( array $options )

Override database's default behavior.

$options include: 'connTimeout' : Set the connection timeout value in seconds. May be useful for very long batch queries such as full-wiki dumps, where a single query reads out over hours or days.

Parameters

array $options

Returns: void

Implements IDatabase.

Definition at line 2986 of file Database.php.

DatabaseBase::setTransactionProfiler ( TransactionProfiler $profiler )

Parameters

TransactionProfiler $profiler

Since: 1.27

Definition at line 310 of file Database.php.

DatabaseBase::sourceFile	(	$filename,
		$lineCallback = `false`,
		$resultCallback = `false`,
		$fname = `false`,
		$inputCallback = `false`
	)

Read and execute SQL commands from a file.

Returns true on success, error string or exception on failure (depending on object's error ignore settings).

Parameters

string	$filename	File name to open
bool \| callable	$lineCallback	Optional function called before reading each line
bool \| callable	$resultCallback	Optional function called for each MySQL result
bool \| string	$fname	Calling function name or false if name should be generated dynamically using $filename
bool \| callable	$inputCallback	Optional function called for each complete line sent

Exceptions

Exception|MWException

Returns: bool|string

Definition at line 3005 of file Database.php.

References $e, and sourceStream().

Referenced by DatabaseSqliteTest\prepareTestDB().

DatabaseBase::sourceStream	(	$fp,
		$lineCallback = `false`,
		$resultCallback = `false`,
		$fname = `__METHOD__`,
		$inputCallback = `false`
	)

Read and execute commands from an open file handle.

Returns true on success, error string or exception on failure (depending on object's error ignore settings).

Parameters

resource	$fp	File handle
bool \| callable	$lineCallback	Optional function called before reading each query
bool \| callable	$resultCallback	Optional function called for each MySQL result
string	$fname	Calling function name
bool \| callable	$inputCallback	Optional function called for each complete query sent

Returns: bool|string

Definition at line 3068 of file Database.php.

References $line, $res, IDatabase\lastError(), query(), replaceVars(), and streamStatementEnd().

Referenced by sourceFile().

DatabaseBase::startAtomic ( $fname = __METHOD__ )

final

Begin an atomic section of statements.

If a transaction has been started already, just keep track of the given section name to make sure the transaction is not committed pre-maturely. This function can be used in layers (with sub-sections), so use a stack to keep track of the different atomic sections. If there is no transaction, start one implicitly.

The goal of this function is to create an atomic section of SQL queries without having to start a new transaction if it already exists.

Atomic sections are more strict than transactions. With transactions, attempting to begin a new transaction when one is already running results in MediaWiki issuing a brief warning and doing an implicit commit. All atomic levels must be explicitly closed using IDatabase::endAtomic(), and any database transactions cannot be began or committed until all atomic levels are closed. There is no such thing as implicitly opening or closing an atomic section.

Since: 1.23

Parameters

string $fname

Exceptions

DBError

Implements IDatabase.

Definition at line 2587 of file Database.php.

References $fname, begin(), DBO_TRX, and getFlag().

Referenced by doAtomicSection().

DatabaseBase::streamStatementEnd	(	&	$sql,
		&	$newLine
	)

Called by sourceStream() to check if we've reached a statement end.

Parameters

string	$sql	SQL assembled so far
string	$newLine	New line about to be added to $sql

Returns: bool Whether $newLine contains end of the statement

Definition at line 3126 of file Database.php.

Referenced by sourceStream().

DatabaseBase::strencode ( $s )

abstract

Wrapper for addslashes()

Parameters

string $s String to be slashed.

Returns: string Slashed string.

Referenced by addQuotes().

DatabaseBase::strictIPs ( )

Returns true if this database is strict about what can be put into an IP field.

Specifically, it uses a NULL value instead of an empty string.

Returns: bool

Definition at line 338 of file Database.php.

DatabaseBase::strreplace	(	$orig,
		$old,
		$new
	)

Returns a comand for str_replace function in SQL query.

Uses REPLACE() in MySQL

Parameters

string	$orig	Column to modify
string	$old	Column to seek
string	$new	Column to replace with

Returns: string

Implements IDatabase.

Definition at line 2349 of file Database.php.

DatabaseBase::tableExists	(	$table,
		$fname = `__METHOD__`
	)

Query whether a given table exists.

Parameters

string	$table
string	$fname

Returns: bool

Implements IDatabase.

Definition at line 1389 of file Database.php.

References $fname, $res, ignoreErrors(), query(), and tableName().

Referenced by DatabaseMysqlBase\dropTable(), dropTable(), and indexExists().

DatabaseBase::tableName	(	$name,
		$format = `'quoted'`
	)

Format a table name ready for use in constructing an SQL query.

This does two important things: it quotes the table names to clean them up, and it adds a table prefix if only given a table name with no quotes.

All functions of this object which require a table name call this function themselves. Pass the canonical name to such functions. This is only needed when calling query() directly.

Note: This function does not sanitize user input. It is not safe to use this function to escape user input.

Parameters

string	$name	Database table name
string	$format	One of: quoted - Automatically pass the table name through addIdentifierQuotes() so that it can be used in a query. raw - Do not add identifier quotes to the table name

Returns: string Full database name

Definition at line 1684 of file Database.php.

References $name, $wgSharedDB, $wgSharedPrefix, $wgSharedSchema, $wgSharedTables, database, global, isQuotedIdentifier(), list, and table.

Referenced by delete(), DatabaseMysqlBase\deleteJoin(), deleteJoin(), DatabaseMysqlBase\dropTable(), dropTable(), DatabaseMysqlBase\fieldInfo(), DatabaseMysqlBase\indexInfo(), insert(), insertSelect(), DatabaseMysqlBase\lockTables(), nativeReplace(), replace(), replaceVars(), MediaWikiTestCase\resetDB(), tableExists(), textFieldSize(), update(), and DatabaseMysqlBase\upsert().

DatabaseBase::tableNames ( )

Fetch a number of table names into an array This is handy when you need to construct SQL for joins.

Example: extract( $dbr->tableNames( 'user', 'watchlist' ) ); $sql = "SELECT wl_namespace,wl_title FROM $watchlist,$user WHERE wl_user=user_id AND wl_user=$nameWithQuotes";

Returns: array

Definition at line 1774 of file Database.php.

DatabaseBase::tableNamesN ( )

Fetch a number of table names into an zero-indexed numerical array This is handy when you need to construct SQL for joins.

Example: list( $user, $watchlist ) = $dbr->tableNamesN( 'user', 'watchlist' ); $sql = "SELECT wl_namespace,wl_title FROM $watchlist,$user WHERE wl_user=user_id AND wl_user=$nameWithQuotes";

Returns: array

Definition at line 1796 of file Database.php.

DatabaseBase::tableNamesWithAlias ( $tables )

Gets an array of aliased table names.

Parameters

array $tables Array( [alias] => table )

Returns: string[] See tableNameWithAlias()

Definition at line 1829 of file Database.php.

DatabaseBase::tableNamesWithUseIndexOrJOIN	(	$tables,
		$use_index = `[]`,
		$join_conds = `[]`
	)

protected

Get the aliased table name clause for a FROM clause which might have a JOIN and/or USE INDEX clause.

Parameters

array	$tables	( [alias] => table )
array	$use_index	Same as for select()
array	$join_conds	Same as for select()

Returns: string

Definition at line 1884 of file Database.php.

Referenced by selectSQLText().

DatabaseBase::tableNameWithAlias	(	$name,
		$alias = `false`
	)

Get an aliased table name e.g.

tableName AS newTableName

Parameters

string	$name	Table name, see tableName()
string \| bool	$alias	Alias (optional)

Returns: string SQL name for aliased table. Will not alias a table to its own name

Definition at line 1815 of file Database.php.

DatabaseBase::tablePrefix ( $prefix = null )

Get/set the table prefix.

Parameters

string $prefix The table prefix to set, or omitted to leave it unchanged.

Returns: string The previous table prefix.

Implements IDatabase.

Definition at line 239 of file Database.php.

References wfSetVar().

Referenced by MediaWikiTestCase\listTables(), MediaWikiTestCase\setupTestDB(), and DatabaseSqliteTest\testTableName().

DatabaseBase::textFieldSize	(	$table,
		$field
	)

Returns the size of a text field, or -1 for "unlimited".

Parameters

string	$table
string	$field

Returns: int

Definition at line 2215 of file Database.php.

References $res, IDatabase\fetchObject(), query(), and tableName().

DatabaseBase::timestamp ( $ts = 0 )

Convert a timestamp in one of the formats accepted by wfTimestamp() to the format used for inserting into timestamp fields in this DBMS.

The result is unquoted, and needs to be passed through addQuotes() before it can be included in raw SQL.

Parameters

string | int $ts

Returns: string

Implements IDatabase.

Definition at line 2855 of file Database.php.

References TS_MW, and wfTimestamp().

Referenced by encodeExpiry(), WatchedItemQueryService\getStartFromConds(), User\makeUpdateConditions(), and timestampOrNull().

DatabaseBase::timestampOrNull ( $ts = null )

Convert a timestamp in one of the formats accepted by wfTimestamp() to the format used for inserting into timestamp fields in this DBMS.

If NULL is input, it is passed through, allowing NULL values to be inserted into timestamp fields.

The result is unquoted, and needs to be passed through addQuotes() before it can be included in raw SQL.

Parameters

string | int $ts

Returns: string

Implements IDatabase.

Definition at line 2859 of file Database.php.

References timestamp().

DatabaseBase::trxLevel ( )

Gets the current transaction level.

Historically, transactions were allowed to be "nested". This is no longer supported, so this function really only returns a boolean.

Returns: int The previous value

Implements IDatabase.

Definition at line 231 of file Database.php.

References $mTrxLevel.

Referenced by close(), and runOnTransactionIdleCallbacks().

DatabaseBase::trxTimestamp ( )

Get the UNIX timestamp of the time that the transaction was established.

This can be used to reason about the staleness of SELECT data in REPEATABLE-READ transaction isolation level.

Returns: float|null Returns null if there is not active transaction

Since: 1.25

Implements IDatabase.

Definition at line 235 of file Database.php.

Referenced by getTransactionLagStatus().

DatabaseBase::unionQueries	(	$sqls,
		$all
	)

Construct a UNION query This is used for providing overload point for other DB abstractions not compatible with the MySQL syntax.

Parameters

array	$sqls	SQL statements to combine
bool	$all	Use UNION ALL

Returns: string SQL fragment

Implements IDatabase.

Definition at line 2335 of file Database.php.

DatabaseBase::unionSupportsOrderAndLimit ( )

Returns true if current database backend supports ORDER BY or LIMIT for separate subqueries within the UNION construct.

Returns: bool

Implements IDatabase.

Definition at line 2331 of file Database.php.

DatabaseBase::unlock	(	$lockName,
		$method
	)

Release a lock.

Named locks are not related to transactions

Parameters

string	$lockName	Name of lock to release
string	$method	Name of the calling method

Returns: int Returns 1 if the lock was released, 0 if the lock was not established by this thread (in which case the lock is not released), and NULL if the named lock did not exist

Implements IDatabase.

Definition at line 3226 of file Database.php.

Referenced by getScopedLockAndFlush().

DatabaseBase::unlockTables ( $method )

Unlock specific tables.

Parameters

string $method The caller

Returns: bool

Definition at line 3270 of file Database.php.

DatabaseBase::update	(	$table,
		$values,
		$conds,
		$fname = `__METHOD__`,
		$options = `[]`
	)

UPDATE wrapper.

Takes a condition array and a SET array.

Parameters

string	$table	Name of the table to UPDATE. This will be passed through DatabaseBase::tableName().
array	$values	An array of values to SET. For each array element, the key gives the field name, and the value gives the data to set that field to. The data will be quoted by IDatabase::addQuotes().
array	$conds	An array of conditions (WHERE). See IDatabase::select() for the details of the format of condition arrays. Use '*' to update all rows.
string	$fname	The function name of the caller (from METHOD), for logging and profiling.
array	$options	An array of UPDATE options, can be: IGNORE: Ignore unique key conflicts LOW_PRIORITY: MySQL-specific, see MySQL manual.

Returns: bool

Implements IDatabase.

Definition at line 1506 of file Database.php.

References $fname, $options, LIST_AND, LIST_SET, makeList(), makeUpdateOptions(), query(), and tableName().

Referenced by LocalFileMoveBatch\doDBUpdates(), PopulateContentModel\updatePageRows(), PopulateContentModel\updateRevisionOrArchiveRows(), and upsert().

DatabaseBase::upsert	(		$table,
		array	$rows,
		array	$uniqueIndexes,
		array	$set,
			$fname = `__METHOD__`
	)

INSERT ON DUPLICATE KEY UPDATE wrapper, upserts an array into a table.

This updates any conflicting rows (according to the unique indexes) using the provided SET clause and inserts any remaining (non-conflicted) rows.

$rows may be either:

A single associative array. The array keys are the field names, and the values are the values to insert. The values are treated as data and will be quoted appropriately. If NULL is inserted, this will be converted to a database NULL.
An array with numeric keys, holding a list of associative arrays. This causes a multi-row INSERT on DBMSs that support it. The keys in each subarray must be identical to each other, and in the same order.

It may be more efficient to leave off unique indexes which are unlikely to collide. However if you do this, you run the risk of encountering errors which wouldn't have occurred in MySQL.

Usually throws a DBQueryError on failure. If errors are explicitly ignored, returns success.

Since: 1.22

Parameters

string	$table	Table name. This will be passed through DatabaseBase::tableName().
array	$rows	A single row or list of rows to insert
array	$uniqueIndexes	List of single field names or field name tuples
array	$set	An array of values to SET. For each array element, the key gives the field name, and the value gives the data to set that field to. The data will be quoted by IDatabase::addQuotes().
string	$fname	Calling function name (use METHOD) for logs/profiling

Exceptions

Exception

Returns: bool

Implements IDatabase.

Definition at line 2135 of file Database.php.

References $e, $fname, $mTrxLevel, as, begin(), commit(), insert(), LIST_AND, LIST_OR, makeList(), rollback(), and update().

DatabaseBase::useIndexClause ( $index )

USE INDEX clause.

Unlikely to be useful for anything but MySQL. This is only needed because a) MySQL must be as efficient as possible due to its use on Wikipedia, and b) MySQL 4.0 is kind of dumb sometimes about which index to pick. Anyway, other databases might have different indexes on a given table. So don't bother overriding this unless you're MySQL.

Parameters

string $index

Returns: string

Definition at line 2049 of file Database.php.

Referenced by makeSelectOptions().

DatabaseBase::wasConnectionError ( $errno )

Determines if the given query error was a connection drop STUB.

Parameters

integer | string $errno

Returns: bool

Definition at line 2380 of file Database.php.

DatabaseBase::wasDeadlock ( )

Determines if the last failure was due to a deadlock STUB.

Returns: bool

Implements IDatabase.

Definition at line 2357 of file Database.php.

Referenced by deadlockLoop().

DatabaseBase::wasErrorReissuable ( )

Determines if the last query error was something that should be dealt with by pinging the connection and reissuing the query.

STUB

Returns: bool

Implements IDatabase.

Definition at line 2365 of file Database.php.

Referenced by query().

DatabaseBase::wasLockTimeout ( )

Determines if the last failure was due to a lock timeout STUB.

Returns: bool

Implements IDatabase.

Definition at line 2361 of file Database.php.

DatabaseBase::wasReadOnlyError ( )

Determines if the last failure was due to the database being read-only.

STUB

Returns: bool

Implements IDatabase.

Definition at line 2369 of file Database.php.

DatabaseBase::writesOrCallbacksPending ( )

Returns true if there is a transaction open with possible write queries or transaction pre-commit/idle callbacks waiting on it to finish.

Returns: bool

Implements IDatabase.

Definition at line 394 of file Database.php.

References $mTrxPreCommitCallbacks.

Referenced by LoadBalancer\commitMasterChanges(), and query().

DatabaseBase::writesPending ( )

Returns: bool Whether there is a transaction open with possible write queries

Since: 1.27

Implements IDatabase.

Definition at line 390 of file Database.php.

References $mTrxDoneWrites.

Member Data Documentation

string [] DatabaseBase::$allViews = null

protected

Since: 1.22 Process cache of VIEWs names in the database

Definition at line 178 of file Database.php.

Referenced by DatabaseMysqlBase\listViews().

DatabaseBase::$delimiter = ';'

protected

Definition at line 78 of file Database.php.

Referenced by getDelimiter().

resource DatabaseBase::$fileHandle = null

protected

Since: 1.21 File handle for upgrade

Definition at line 172 of file Database.php.

DatabaseBase::$htmlErrors

protected

Definition at line 76 of file Database.php.

IDatabase null DatabaseBase::$lazyMasterHandle

private

Lazy handle to the master DB this server replicates from.

Definition at line 166 of file Database.php.

Referenced by getLazyMasterHandle().

resource DatabaseBase::$mConn = null

protected

Database connection.

Definition at line 52 of file Database.php.

Referenced by __toString(), DatabaseMysqlBase\getBindingHandle(), DatabaseMssql\open(), and DatabaseOracle\open().

DatabaseBase::$mDBname

Definition at line 46 of file Database.php.

Referenced by getDBname(), getWikiID(), and DatabaseMysqlBase\listViews().

DatabaseBase::$mDefaultBigSelects = null

protected

Definition at line 69 of file Database.php.

Referenced by DatabaseMysqlBase\setBigSelects().

DatabaseBase::$mDoneWrites = false

protected

Definition at line 43 of file Database.php.

Referenced by doneWrites().

DatabaseBase::$mFlags

protected

Definition at line 66 of file Database.php.

DatabaseBase::$mForeign

protected

Definition at line 67 of file Database.php.

DatabaseBase::$mLastQuery = ''

protected

Definition at line 42 of file Database.php.

Referenced by lastQuery().

DatabaseBase::$mLBInfo = []

protected

Definition at line 68 of file Database.php.

Referenced by getLBInfo().

array DatabaseBase::$mNamedLocksHeld = []

private

Map of (name => 1) for locks obtained via lock()

Definition at line 163 of file Database.php.

DatabaseBase::$mOpened = false

protected

Definition at line 53 of file Database.php.

Referenced by isOpen().

DatabaseBase::$mPassword

Definition at line 46 of file Database.php.

DatabaseBase::$mPHPError = false

protected

Definition at line 44 of file Database.php.

DatabaseBase::$mSchema

protected

Definition at line 65 of file Database.php.

DatabaseBase::$mSchemaVars = false

protected

Definition at line 70 of file Database.php.

Referenced by getSchemaVars().

DatabaseBase::$mServer

protected

Definition at line 46 of file Database.php.

Referenced by getServer().

array DatabaseBase::$mSessionVars = []

protected

Definition at line 72 of file Database.php.

DatabaseBase::$mTablePrefix

protected

Definition at line 64 of file Database.php.

array DatabaseBase::$mTrxAtomicLevels = []

private

Array of levels of atomicity within transactions.

Definition at line 139 of file Database.php.

bool DatabaseBase::$mTrxAutomatic = false

private

Record if the current transaction was started implicitly due to DBO_TRX being set.

See Also: DatabaseBase::mTrxLevel

Definition at line 132 of file Database.php.

bool DatabaseBase::$mTrxAutomaticAtomic = false

private

Record if the current transaction was started implicitly by DatabaseBase::startAtomic.

Definition at line 146 of file Database.php.

bool DatabaseBase::$mTrxDoneWrites = false

private

Record if possible write queries were done in the last transaction started.

See Also: DatabaseBase::mTrxLevel

Definition at line 124 of file Database.php.

Referenced by writesPending().

array [] DatabaseBase::$mTrxEndCallbacks = []

protected

List of (callable, method name)

Definition at line 60 of file Database.php.

string DatabaseBase::$mTrxFname = null

private

Remembers the function name given for starting the most recent transaction via begin().

Used to provide additional context for error reporting.

See Also: DatabaseBase::mTrxLevel

Definition at line 116 of file Database.php.

array [] DatabaseBase::$mTrxIdleCallbacks = []

protected

List of (callable, method name)

Definition at line 56 of file Database.php.

int DatabaseBase::$mTrxLevel = 0

protected

Either 1 if a transaction is active or 0 otherwise.

The other Trx fields may not be meaningfull if this is 0.

Definition at line 86 of file Database.php.

Referenced by query(), trxLevel(), and upsert().

array [] DatabaseBase::$mTrxPreCommitCallbacks = []

protected

List of (callable, method name)

Definition at line 58 of file Database.php.

Referenced by runOnTransactionPreCommitCallbacks(), and writesOrCallbacksPending().

string DatabaseBase::$mTrxShortId = ''

protected

Either a short hexidecimal string if a transaction is active or "".

See Also: DatabaseBase::mTrxLevel

Definition at line 94 of file Database.php.

float DatabaseBase::$mTrxSlaveLag = null

private

Lag estimate at the time of BEGIN.

Definition at line 107 of file Database.php.

Referenced by getTransactionLagStatus().

float null DatabaseBase::$mTrxTimestamp = null

private

The UNIX time that the transaction started.

Callers can assume that if snapshot isolation is used, then the data is at least up to date to that point (possibly more up-to-date since the first SELECT defines the snapshot).

See Also: DatabaseBase::mTrxLevel

Definition at line 104 of file Database.php.

string [] DatabaseBase::$mTrxWriteCallers = []

private

Track the write query callers of the current transaction.

Definition at line 153 of file Database.php.

float DatabaseBase::$mTrxWriteDuration = 0.0

private

Track the seconds spent in write queries for the current transaction.

Definition at line 160 of file Database.php.

DatabaseBase::$mUser

Definition at line 46 of file Database.php.

DatabaseBase::$preparedArgs

protected

Definition at line 74 of file Database.php.

BagOStuff DatabaseBase::$srvCache

protected

APC cache.

Definition at line 49 of file Database.php.

Referenced by DatabaseMysqlBase\getMasterServerInfo().

bool DatabaseBase::$suppressPostCommitCallbacks = false

protected

Whether to suppress triggering of post-commit callbacks.

Definition at line 62 of file Database.php.

TransactionProfiler DatabaseBase::$trxProfiler

protected

Definition at line 181 of file Database.php.

Referenced by getTransactionProfiler().

const DatabaseBase::DEADLOCK_DELAY_MAX = 1500000

Maximum time to wait before retry.

Definition at line 40 of file Database.php.

const DatabaseBase::DEADLOCK_DELAY_MIN = 500000

Minimum time to wait before retry, in microseconds.

Definition at line 37 of file Database.php.

const DatabaseBase::DEADLOCK_TRIES = 4

Number of times to re-try an operation in case of deadlock.

Definition at line 34 of file Database.php.

The documentation for this class was generated from the following file:

includes/db/Database.php

Public Member Functions

Static Public Member Functions

Public Attributes

Protected Member Functions

Static Protected Member Functions

Protected Attributes

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