Database abstraction object. More...

Inheritance diagram for DatabaseBase:

Collaboration diagram for DatabaseBase:

Public Member Functions
	__construct ($server=false, $user=false, $password=false, $dbName=false, $flags=0, $tablePrefix= 'get from global', $foreign=false)
	Constructor.
	__destruct ()
	Run a few simple sanity checks.
	__sleep ()
	Called by serialize.
	__toString ()
	addIdentifierQuotes ($s)
	Quotes an identifier using `backticks` or "double quotes" depending on the database type.
	addQuotes ($s)
	Adds quotes and backslashes.
	aggregateValue ($valuedata, $valuename= 'value')
	Return aggregated value alias.
	anyChar ()
	Returns a token for buildLike() that denotes a '_' to be used in a LIKE query.
	anyString ()
	Returns a token for buildLike() that denotes a '' to be used in a LIKE query.
	begin ($fname=__METHOD__)
	Begin a transaction.
	bitAnd ($fieldLeft, $fieldRight)
	bitNot ($field)
	bitOr ($fieldLeft, $fieldRight)
	bufferResults ($buffer=null)
	Turns buffering of SQL result sets on (true) or off (false).
	buildConcat ($stringList)
	Build a concatenation list to feed into a SQL query.
	buildLike ()
	LIKE statement wrapper, receives a variable-length argument list with parts of pattern to match containing either string literals that will be escaped or tokens returned by anyChar() or anyString().
	cascadingDeletes ()
	Returns true if this database supports (and uses) cascading deletes.
	cleanupTriggers ()
	Returns true if this database supports (and uses) triggers (e.g.
	clearFlag ($flag)
	Clear a flag for this connection.
	clearViewsCache ()
	Reset the views process cache set by listViews()
	close ()
	Closes a database connection.
	commit ($fname=__METHOD__, $flush= '')
	Commits a transaction previously started using begin().
	conditional ($cond, $trueVal, $falseVal)
	Returns an SQL expression for a simple conditional.
	connectionErrorHandler ($errno, $errstr)
	deadlockLoop ()
	Perform a deadlock-prone transaction.
	debug ($debug=null)
	Boolean, controls output of large amounts of debug information.
	decodeBlob ($b)
	Some DBMSs return a special placeholder object representing blob fields in result objects.
	decodeExpiry ($expiry, $format=TS_MW)
	Decode an expiry time into a DBMS independent format.
	delete ($table, $conds, $fname=__METHOD__)
	DELETE query wrapper.
	deleteJoin ($delTable, $joinTable, $delVar, $joinVar, $conds, $fname=__METHOD__)
	DELETE where the condition is a join.
	doneWrites ()
	Returns true if the connection may have been used for write queries.
	dropTable ($tableName, $fName=__METHOD__)
	Delete a table.
	duplicateTableStructure ($oldName, $newName, $temporary=false, $fname=__METHOD__)
	Creates a new table with structure copied from existing table Note that unlike most database abstraction functions, this function does not automatically append database prefix, because it works at a lower abstraction level.
	encodeBlob ($b)
	Some DBMSs have a special format for inserting into blob fields, they don't allow simple quoted strings to be inserted.
	encodeExpiry ($expiry)
	Encode an expiry time into the DBMS dependent format.
	errorCount ($count=null)
	Get/set the number of errors logged.
	estimateRowCount ($table, $vars= '*', $conds= '', $fname=__METHOD__, $options=array())
	Estimate rows in dataset.
	execute ($prepared, $args=null)
	Execute a prepared query with the various arguments.
	fieldExists ($table, $field, $fname=__METHOD__)
	Determines whether a field exists in a table.
	fieldNamesWithAlias ($fields)
	Gets an array of aliased field names.
	fieldNameWithAlias ($name, $alias=false)
	Get an aliased field name e.g.
	fieldType ($res, $index)
	mysql_field_type() wrapper
	fillPrepared ($preparedQuery, $args)
	For faking prepared SQL statements on DBs that don't support it directly.
	freeResult ($res)
	Free a result object returned by query() or select().
	functionalIndexes ()
	Returns true if this database can use functional indexes.
	getDBname ()
	Get the current DB name.
	getDelimiter ()
	getFlag ($flag)
	Returns a boolean whether the flag $flag is set for this connection.
	getInfinity ()
	Find out when 'infinity' is.
	getLag ()
	Get slave lag.
	getLBInfo ($name=null)
	Get properties passed down from the server info array of the load balancer.
	getMasterPos ()
	Get the position of this master.
	getProperty ($name)
	General read-only accessor.
	getSchemaPath ()
	Return a path to the DBMS-specific schema file, otherwise default to tables.sql.
	getSearchEngine ()
	Get search engine class.
	getServer ()
	Get the server hostname or IP address.
	getServerInfo ()
	A string describing the current software version, and possibly other details in a user-friendly way.
	getServerUptime ()
	Determines how long the server has been up STUB.
	getSlavePos ()
	Get the replication position of this slave.
	getWikiID ()
	ignoreErrors ($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.
	implicitGroupby ()
	Returns true if this database does an implicit sort when doing GROUP BY.
	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.
	indexExists ($table, $index, $fname=__METHOD__)
	Determines whether an index exists Usually throws a DBQueryError on failure If errors are explicitly ignored, returns NULL on failure.
	indexUnique ($table, $index)
	Determines if a given index is unique.
	insert ($table, $a, $fname=__METHOD__, $options=array())
	INSERT wrapper, inserts an array into a table.
	insertSelect ($destTable, $srcTable, $varMap, $conds, $fname=__METHOD__, $insertOptions=array(), $selectOptions=array())
	INSERT SELECT wrapper.
	isOpen ()
	Is a connection to the database open?
	isQuotedIdentifier ($name)
	Returns if the given identifier looks quoted or not according to the database convention for quoting identifiers .
	isView ($name)
	Differentiates between a TABLE and a VIEW.
	isWriteQuery ($sql)
	Determine whether a query writes to the DB.
	lastQuery ()
	Return the last query that went through DatabaseBase::query()
	limitResult ($sql, $limit, $offset=false)
	Construct a LIMIT query with optional offset.
	listTables ($prefix=null, $fname=__METHOD__)
	List all tables on the database.
	listViews ($prefix=null, $fname=__METHOD__)
	Lists all the VIEWs in the database.
	lock ($lockName, $method, $timeout=5)
	Acquire a named lock.
	lockIsFree ($lockName, $method)
	Check to see if a named lock is available.
	lockTables ($read, $write, $method, $lowPriority=true)
	Lock specific tables.
	lowPriorityOption ()
	A string to insert into queries to show that they're low-priority, like MySQL's LOW_PRIORITY.
	makeGroupByWithHaving ($options)
	Returns an optional GROUP BY with an optional HAVING.
	makeList ($a, $mode=LIST_COMMA)
	Makes an encoded list of strings from an array.
	makeOrderBy ($options)
	Returns an optional ORDER BY.
	makeSelectOptions ($options)
	Returns an optional USE INDEX clause to go after the table, and a string to go at the end of the query.
	makeWhereFrom2d ($data, $baseKey, $subKey)
	Build a partial where clause from a 2-d array such as used for LinkBatch.
	masterPosWait (DBMasterPos $pos, $timeout)
	Wait for the slave to catch up to a given master position.
	maxListLen ()
	Return the maximum number of items allowed in a list, or 0 for unlimited.
	nextSequenceValue ($seqName)
	Returns an appropriately quoted sequence value for inserting a new row.
	onTransactionIdle ($callback)
	Run an anonymous function as soon as there is no transaction pending.
	onTransactionPreCommitOrIdle ($callback)
	Run an anonymous function before the current transaction commits or now if there is none.
	patchPath ($patch)
	Get the full path of a patch file.
	ping ()
	Ping the server and try to reconnect if it there is no connection.
	query ($sql, $fname=__METHOD__, $tempIgnore=false)
	Run an SQL query and return the result.
	realTimestamps ()
	Returns true if this database uses timestamps rather than integers.
	replace ($table, $uniqueIndexes, $rows, $fname=__METHOD__)
	REPLACE query wrapper.
	reportConnectionError ($error= 'Unknown error')
	reportQueryError ($error, $errno, $sql, $fname, $tempIgnore=false)
	Report a query error.
	resultObject ($result)
	Take the result from a query, and wrap it in a ResultWrapper if necessary.
	rollback ($fname=__METHOD__)
	Rollback a transaction previously started using begin().
	searchableIPs ()
	Returns true if this database can do a native search on IP columns e.g.
	select ($table, $vars, $conds= '', $fname=__METHOD__, $options=array(), $join_conds=array())
	Execute a SELECT query constructed using the various parameters provided.
	selectDB ($db)
	Change the current database.
	selectField ($table, $var, $cond= '', $fname=__METHOD__, $options=array())
	A SELECT wrapper which returns a single field from a single result row.
	selectRow ($table, $vars, $conds, $fname=__METHOD__, $options=array(), $join_conds=array())
	Single row SELECT wrapper.
	selectSQLText ($table, $vars, $conds= '', $fname=__METHOD__, $options=array(), $join_conds=array())
	The equivalent of DatabaseBase::select() except that the constructed SQL is returned, instead of being immediately executed.
	setBigSelects ($value=true)
	Allow or deny "big selects" for this session only.
	setFakeMaster ($enabled=true)
	Make this connection a fake master.
	setFakeSlaveLag ($lag)
	Set lag time in seconds for a fake slave.
	setFileHandle ($fh)
	Set the filehandle to copy write statements to.
	setFlag ($flag)
	Set a flag for this connection.
	setLBInfo ($name, $value=null)
	Set the LB info array, or a member of it.
	setSchemaVars ($vars)
	Set variables to be used in sourceFile/sourceStream, in preference to the ones in $GLOBALS.
	setSessionOptions (array $options)
	Override database's default behavior.
	sourceFile ($filename, $lineCallback=false, $resultCallback=false, $fname=false, $inputCallback=false)
	Read and execute SQL commands from a file.
	sourceStream ($fp, $lineCallback=false, $resultCallback=false, $fname=__METHOD__, $inputCallback=false)
	Read and execute commands from an open file handle.
	streamStatementEnd (&$sql, &$newLine)
	Called by sourceStream() to check if we've reached a statement end.
	strictIPs ()
	Returns true if this database is strict about what can be put into an IP field.
	strreplace ($orig, $old, $new)
	Returns a comand for str_replace function in SQL query.
	tableExists ($table, $fname=__METHOD__)
	Query whether a given table exists.
	tableName ($name, $format= 'quoted')
	Format a table name ready for use in constructing an SQL query.
	tableNames ()
	Fetch a number of table names into an array This is handy when you need to construct SQL for joins.
	tableNamesN ()
	Fetch a number of table names into an zero-indexed numerical array This is handy when you need to construct SQL for joins.
	tableNamesWithAlias ($tables)
	Gets an array of aliased table names.
	tableNameWithAlias ($name, $alias=false)
	Get an aliased table name e.g.
	tablePrefix ($prefix=null)
	Get/set the table prefix.
	textFieldSize ($table, $field)
	Returns the size of a text field, or -1 for "unlimited".
	timestamp ($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.
	timestampOrNull ($ts=null)
	Convert a timestamp in one of the formats accepted by wfTimestamp() to the format used for inserting into timestamp fields in this DBMS.
	trxLevel ($level=null)
	Gets or sets the current transaction level.
	unionQueries ($sqls, $all)
	Construct a UNION query This is used for providing overload point for other DB abstractions not compatible with the MySQL syntax.
	unionSupportsOrderAndLimit ()
	Returns true if current database backend supports ORDER BY or LIMIT for separate subqueries within the UNION construct.
	unlock ($lockName, $method)
	Release a lock.
	unlockTables ($method)
	Unlock specific tables.
	update ($table, $values, $conds, $fname=__METHOD__, $options=array())
	UPDATE wrapper.
	upsert ($table, array $rows, array $uniqueIndexes, array $set, $fname=__METHOD__)
	INSERT ON DUPLICATE KEY UPDATE wrapper, upserts an array into a table.
	useIndexClause ($index)
	USE INDEX clause.
	wasDeadlock ()
	Determines if the last failure was due to a deadlock STUB.
	wasErrorReissuable ()
	Determines if the last query error was something that should be dealt with by pinging the connection and reissuing the query.
	wasLockTimeout ()
	Determines if the last failure was due to a lock timeout STUB.
	wasReadOnlyError ()
	Determines if the last failure was due to the database being read-only.
	writesOrCallbacksPending ()
	Returns true if there is a transaction open with possible write queries or transaction pre-commit/idle callbacks waiting on it to finish.
Static Public Member Functions
static	factory ($dbType, $p=array())
	Given a DB type, construct the name of the appropriate child class of DatabaseBase.
static	generalizeSQL ($sql)
	Removes most variables from an SQL query and replaces them with X or N for numbers.
Public Attributes
	$mDBname
	$mFakeMaster = false
	$mPassword
	$mUser
const	DEADLOCK_DELAY_MAX = 1500000
	Maximum time to wait before retry.
const	DEADLOCK_DELAY_MIN = 500000
	Minimum time to wait before retry, in microseconds.
const	DEADLOCK_TRIES = 4
	Number of times to re-try an operation in case of deadlock.
Protected Member Functions
	closeConnection ()
	Closes underlying database connection.
	doBegin ($fname)
	Issues the BEGIN command to the database server.
	doCommit ($fname)
	Issues the COMMIT command to the database server.
	doQuery ($sql)
	The DBMS-dependent part of query()
	doRollback ($fname)
	Issues the ROLLBACK command to the database server.
	escapeLikeInternal ($s)
	fillPreparedArg ($matches)
	preg_callback func for fillPrepared() The arguments should be in $this->preparedArgs and must not be touched while we're doing this.
	freePrepared ($prepared)
	Free a prepared query, generated by prepare().
	getDefaultSchemaVars ()
	Get schema variables to use if none have been set via setSchemaVars().
	getSchemaVars ()
	Get schema variables.
	indexName ($index)
	Get the name of an index in a given table.
	indexNameCallback ($matches)
	Index name callback.
	installErrorHandler ()
	makeInsertOptions ($options)
	Helper for DatabaseBase::insert().
	makeUpdateOptions ($options)
	Make UPDATE options for the DatabaseBase::update function.
	nativeReplace ($table, $rows, $fname)
	REPLACE query wrapper for MySQL and SQLite, which have a native REPLACE statement.
	prepare ($sql, $func= 'DatabaseBase::prepare')
	Intended to be compatible with the PEAR::DB wrapper functions.
	replaceSchemaVars ($ins)
	Database independent variable replacement.
	replaceVars ($ins)
	Replace variables in sourced SQL.
	restoreErrorHandler ()
	runOnTransactionIdleCallbacks ()
	Actually any "on transaction idle" callbacks.
	runOnTransactionPreCommitCallbacks ()
	Actually any "on transaction pre-commit" callbacks.
	tableNameCallback ($matches)
	Table name callback.
	tableNamesWithUseIndexOrJOIN ($tables, $use_index=array(), $join_conds=array())
	Get the aliased table name clause for a FROM clause which might have a JOIN and/or USE INDEX clause.
Protected Attributes
Process	$allViews = null
	$delimiter = ';'
file	$fileHandle = null
	$htmlErrors
	$mConn = null
	$mDefaultBigSelects = null
	$mDoneWrites = false
	$mErrorCount = 0
	$mFakeSlaveLag = null
	$mFlags
	$mForeign
	$mLastQuery = ''
	$mLBInfo = array()
	$mOpened = false
	$mPHPError = false
	$mSchemaVars = false
	$mServer
	$mTablePrefix
callable[]	$mTrxIdleCallbacks = array()
	*
	$mTrxLevel = 0
callable[]	$mTrxPreCommitCallbacks = array()
	*
	$preparedArgs
Private Attributes
Bool	$mTrxAutomatic = false
	Record if the current transaction was started implicitly due to DBO_TRX being set.
Bool	$mTrxDoneWrites = false
	Record if possible write queries were done in the last transaction started.
String	$mTrxFname = null
	Remembers the function name given for starting the most recent transaction via begin().

Detailed Description

Database abstraction object.

Definition at line 217 of file Database.php.

Constructor & Destructor Documentation

DatabaseBase::__construct	(	$	server = `false`,
		$	user = `false`,
		$	password = `false`,
		$	dbName = `false`,
		$	flags = `0`,
		$	tablePrefix = `'get from global'`,
		$	foreign = `false`
	)

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.

FIXME: The long list of formal parameters here is not really appropriate for MySQL, and not at all appropriate for any other DBMS. It should be replaced by named parameters as in DatabaseBase::factory().

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

Parameters:

string	$server	database server host
string	$user	database user name
string	$password	database user password
string	$dbName	database name
	$flags
string	$tablePrefix	database table prefixes. By default use the prefix gave in LocalSettings.php
bool	$foreign	disable some operations specific to local databases

Definition at line 684 of file Database.php.

DatabaseBase::__destruct ( )

Run a few simple sanity checks.

Reimplemented in DatabaseOracle.

Definition at line 3935 of file Database.php.

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 724 of file Database.php.

DatabaseBase::__toString ( )

Since:: 1.19

Definition at line 3928 of file Database.php.

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:

$s string

Returns:: string

Reimplemented in DatabaseOracle, DatabaseMssql, DatabaseMysqlBase, and DatabaseTestHelper.

Definition at line 2373 of file Database.php.

Referenced by DatabasePostgres\determineCoreSchema(), DatabasePostgres\duplicateTableStructure(), and DatabaseMysqlBaseTest\testAddIdentifierQuotes().

DatabaseBase::addQuotes ( $ s )

Adds quotes and backslashes.

Parameters:

$s string

Returns:: string

Reimplemented in DatabasePostgres, DatabaseOracle, DatabaseMssql, and DatabaseSqlite.

Definition at line 2351 of file Database.php.

Referenced by RefreshImageMetadata\execute().

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

Return aggregated value alias.

Parameters:

$valuedata
$valuename	string

Returns:: string

Reimplemented in DatabasePostgres, and DatabaseOracle.

Definition at line 2003 of file Database.php.

DatabaseBase::anyChar ( )

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

Returns:: LikeMatch

Definition at line 2438 of file Database.php.

DatabaseBase::anyString ( )

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

Returns:: LikeMatch

Definition at line 2447 of file Database.php.

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:

$fname string

Definition at line 3200 of file Database.php.

Referenced by DatabasePostgres\determineCoreSchema().

DatabaseBase::bitAnd	(	$	fieldLeft,
		$	fieldRight
	)

Parameters:

$fieldLeft
$fieldRight

Returns:: string

Reimplemented in DatabaseOracle.

Definition at line 2020 of file Database.php.

DatabaseBase::bitNot ( $ field )

Parameters:

$field

Returns:: string

Reimplemented in DatabaseOracle.

Definition at line 2011 of file Database.php.

DatabaseBase::bitOr	(	$	fieldLeft,
		$	fieldRight
	)

Parameters:

$fieldLeft
$fieldRight

Returns:: string

Reimplemented in DatabaseOracle.

Definition at line 2029 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:

$buffer null|bool

Returns:: null|bool The previous value of the flag

Definition at line 347 of file Database.php.

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

Reimplemented in DatabasePostgres, DatabaseMssql, and DatabaseSqlite.

Definition at line 2038 of file Database.php.

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

Reimplemented in DatabaseSqlite.

Definition at line 2413 of file Database.php.

DatabaseBase::cascadingDeletes ( )

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

Returns:: bool

Reimplemented in DatabasePostgres, DatabaseOracle, and DatabaseMssql.

Definition at line 472 of file Database.php.

DatabaseBase::cleanupTriggers ( )

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

on the page table)

Returns:: bool

Reimplemented in DatabasePostgres, DatabaseOracle, and DatabaseMssql.

Definition at line 481 of file Database.php.

DatabaseBase::clearFlag ( $ flag )

Clear a flag for this connection.

Parameters:

$flag,: same as setFlag()'s $flag param

Definition at line 604 of file Database.php.

DatabaseBase::clearViewsCache ( ) [final]

Reset the views process cache set by listViews()

Since:: 1.22

Definition at line 3366 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.

Definition at line 840 of file Database.php.

Referenced by DatabaseOracle\__destruct(), DatabaseMssql\open(), DatabaseOracle\open(), and DatabasePostgres\open().

DatabaseBase::closeConnection ( ) [abstract, protected]

Closes underlying database connection.

Since:: 1.20

Returns:: bool: Whether connection was closed successfully

Reimplemented in DatabasePostgres, DatabaseOracle, DatabaseTestHelper, DatabaseMssql, DatabaseSqlite, DatabaseMysqli, DatabaseMysql, and FakeDatabaseMysqlBase.

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:

	$fname	string
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 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.

Definition at line 3258 of file Database.php.

Referenced by DatabasePostgres\determineCoreSchema(), and DatabaseSqlite\doBegin().

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

Definition at line 2899 of file Database.php.

DatabaseBase::connectionErrorHandler	(	$	errno,
		$	errstr
	)

Parameters:

$errno
$errstr

Access:: private

Definition at line 829 of file Database.php.

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.

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

Extra arguments are passed through to the specified callback function.

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

Returns:: bool

Reimplemented in DatabaseSqlite.

Definition at line 2989 of file Database.php.

DatabaseBase::debug ( $ debug = null )

Boolean, controls output of large amounts of debug information.

Parameters:

$debug

bool|null

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 321 of file Database.php.

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:

$b string

Returns:: string

Reimplemented in DatabasePostgres, DatabaseMssql, DatabaseOracle, and DatabaseSqlite.

Definition at line 3511 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
	$format	integer: TS_* constant, defaults to TS_MW

Returns:: String

Definition at line 3906 of file Database.php.

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

DELETE query wrapper.

Parameters:

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

Exceptions:

DBUnexpectedError

Returns:: bool|ResultWrapper

Reimplemented in DatabaseOracle.

Definition at line 2757 of file Database.php.

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:

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

Exceptions:

DBUnexpectedError

Reimplemented in DatabaseMysqlBase.

Definition at line 2690 of file Database.php.

DatabaseBase::doBegin ( $ fname ) [protected]

Issues the BEGIN command to the database server.

See also:: DatabaseBase::begin()

Parameters:

type $fname

Reimplemented in DatabaseOracle, DatabaseMssql, and DatabaseSqlite.

Definition at line 3241 of file Database.php.

References query().

DatabaseBase::doCommit ( $ fname ) [protected]

Issues the COMMIT command to the database server.

See also:: DatabaseBase::commit()

Parameters:

type $fname

Reimplemented in DatabaseOracle, DatabaseMssql, and DatabaseSqlite.

Definition at line 3288 of file Database.php.

References query().

DatabaseBase::doneWrites ( )

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

Should return true if unsure.

Returns:: bool

Definition at line 556 of file Database.php.

DatabaseBase::doQuery ( $ sql ) [abstract, protected]

The DBMS-dependent part of query()

Parameters:

$sql	String: SQL query.

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

Reimplemented in DatabasePostgres, DatabaseOracle, DatabaseSqlite, DatabaseTestHelper, DatabaseMssql, DatabaseMysqli, DatabaseMysql, and FakeDatabaseMysqlBase.

DatabaseBase::doRollback ( $ fname ) [protected]

Issues the ROLLBACK command to the database server.

See also:: DatabaseBase::rollback()

Parameters:

type $fname

Reimplemented in DatabaseOracle, DatabaseMssql, and DatabaseSqlite.

Definition at line 3322 of file Database.php.

References query().

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

Delete a table.

Parameters:

$tableName	string
$fName	string

Returns:: bool|ResultWrapper

Since:: 1.18

Reimplemented in DatabaseMysqlBase, and DatabaseOracle.

Definition at line 3855 of file Database.php.

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
	$temporary	Boolean: whether the new table should be temporary
string	$fname	calling function name

Exceptions:

MWException

Returns:: Boolean: true if operation was successful

Reimplemented in DatabasePostgres, DatabaseMysqlBase, DatabaseSqlite, and DatabaseOracle.

Definition at line 3344 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 DatabaseBase::insert().

Parameters:

$b string

Returns:: string

Reimplemented in DatabasePostgres, DatabaseMssql, DatabaseOracle, and DatabaseSqlite.

Definition at line 3500 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

Definition at line 3893 of file Database.php.

References getInfinity(), and timestamp().

DatabaseBase::errorCount ( $ count = null )

Get/set the number of errors logged.

Only useful when errors are ignored

Parameters:

int $count The count to set, or omitted to leave it unchanged.

Returns:: int The error count

Definition at line 390 of file Database.php.

DatabaseBase::escapeLikeInternal ( $ s ) [protected]

Parameters:

$s string

Returns:: string

Definition at line 2393 of file Database.php.

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

Estimate 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 DatabaseBase::select().

Parameters:

string	$table	table name
array \| string	$vars	: unused
array \| string	$conds	: filters on the table
string	$fname	function name for profiling
array	$options	options for select

Returns:: Integer: row count

Reimplemented in DatabasePostgres, DatabaseMysqlBase, and DatabaseMssql.

Definition at line 1613 of file Database.php.

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

Execute a prepared query with the various arguments.

Parameters:

string	$prepared	the prepared sql
	$args	Mixed: Either an array here, or put scalars as varargs

Returns:: ResultWrapper

Definition at line 1106 of file Database.php.

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

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(); WebInstaller_DBConnect::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, driver

Returns:: DatabaseBase subclass or null

Definition at line 749 of file Database.php.

Referenced by ForeignDBRepo\getMasterDB(), MysqlInstaller\openConnection(), LoadBalancer\reallyOpenConnection(), MysqlInstaller\setupUser(), 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:: Boolean: whether $table has filed $field

Reimplemented in DatabaseMssql.

Definition at line 1664 of file Database.php.

DatabaseBase::fieldNamesWithAlias ( $ fields )

Gets an array of aliased field names.

Parameters:

$fields array( [alias] => field )

Returns:: array of strings, see fieldNameWithAlias()

Definition at line 2250 of file Database.php.

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 2236 of file Database.php.

DatabaseBase::fieldType	(	$	res,
		$	index
	)

mysql_field_type() wrapper

Parameters:

$res
$index

Returns:: string

Reimplemented in DatabasePostgres.

Definition at line 1717 of file Database.php.

References $res.

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	of arguments to fill it with

Returns:: string executable SQL

Definition at line 1125 of file Database.php.

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:

$matches Array

Exceptions:

DBUnexpectedError

Returns:: String

Definition at line 1142 of file Database.php.

DatabaseBase::freePrepared ( $ prepared ) [protected]

Free a prepared query, generated by prepare().

Parameters:

$prepared

Definition at line 1095 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:

$res	Mixed: A SQL result

Reimplemented in DatabasePostgres, DatabaseOracle, DatabaseSqlite, DatabaseMssql, and DatabaseMysqlBase.

Definition at line 1174 of file Database.php.

DatabaseBase::functionalIndexes ( )

Returns true if this database can use functional indexes.

Returns:: bool

Reimplemented in DatabasePostgres, and DatabaseMssql.

Definition at line 538 of file Database.php.

static DatabaseBase::generalizeSQL ( $ sql ) [static]

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 1635 of file Database.php.

DatabaseBase::getDBname ( )

Get the current DB name.

Reimplemented in DatabasePostgres, and DatabaseOracle.

Definition at line 2062 of file Database.php.

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

Reimplemented in DatabaseMysqlBase.

Definition at line 3756 of file Database.php.

Referenced by getSchemaVars().

DatabaseBase::getDelimiter ( )

Returns:: string: command delimiter used by this database engine

Definition at line 308 of file Database.php.

References DatabaseType\getServerVersion().

DatabaseBase::getFlag ( $ flag )

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

Parameters:

$flag,: same as setFlag()'s $flag param

Returns:: Boolean

Definition at line 618 of file Database.php.

Referenced by DatabaseOracle\doQuery().

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

Reimplemented in DatabaseOracle, and DatabaseMssql.

Definition at line 3883 of file Database.php.

Referenced by 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 Database replication lag in seconds

Reimplemented in DatabaseMysqlBase.

Definition at line 3479 of file Database.php.

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:: LoadBalancer|null

Definition at line 421 of file Database.php.

DatabaseBase::getMasterPos ( )

Get the position of this master.

Returns:: DBMasterPos, or false if this is not a master

Reimplemented in DatabaseMysqlBase.

Definition at line 3090 of file Database.php.

DatabaseBase::getProperty ( $ name )

General read-only accessor.

Parameters:

$name string

Returns:: string

Definition at line 629 of file Database.php.

DatabaseBase::getSchemaPath ( )

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

Returns:: string

Definition at line 649 of file Database.php.

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 3740 of file Database.php.

References getDefaultSchemaVars().

DatabaseBase::getSearchEngine ( )

Get search engine class.

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

Returns:: String

Reimplemented in DatabasePostgres, DatabaseOracle, DatabaseMssql, DatabaseMysqlBase, and DatabaseSqlite.

Definition at line 3872 of file Database.php.

DatabaseBase::getServer ( )

Get the server hostname or IP address.

Reimplemented in DatabasePostgres, and DatabaseOracle.

Definition at line 2069 of file Database.php.

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 DatabaseType.

Reimplemented in DatabaseSqlite, and DatabaseTestHelper.

Definition at line 301 of file Database.php.

DatabaseBase::getServerUptime ( )

Determines how long the server has been up STUB.

Returns:: int

Reimplemented in DatabaseMysqlBase.

Definition at line 2926 of file Database.php.

DatabaseBase::getSlavePos ( )

Get the replication position of this slave.

Returns:: DBMasterPos, or false if this is not a slave.

Reimplemented in DatabaseMysqlBase.

Definition at line 3074 of file Database.php.

DatabaseBase::getWikiID ( )

Returns:: string

Definition at line 636 of file Database.php.

References $name.

DatabaseBase::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.

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:

$ignoreErrors bool|null

Returns:: bool The previous value of the flag.

Definition at line 368 of file Database.php.

Referenced by ORMTableTest\testIgnoreErrorsOverride().

DatabaseBase::implicitGroupby ( )

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

Returns:: bool

Reimplemented in DatabasePostgres, DatabaseOracle, DatabaseSqlite, and DatabaseMssql.

Definition at line 509 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

Reimplemented in DatabasePostgres, DatabaseOracle, and DatabaseMssql.

Definition at line 519 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:

$table
$index
$fname	string

Returns:: bool|null

Reimplemented in DatabaseOracle.

Definition at line 1681 of file Database.php.

DatabaseBase::indexName ( $ index ) [protected]

Get the name of an index in a given table.

Parameters:

$index

Returns:: string

Reimplemented in DatabaseSqlite.

Definition at line 2329 of file Database.php.

Referenced by DatabasePostgres\indexUnique().

DatabaseBase::indexNameCallback ( $ matches ) [protected]

Index name callback.

Parameters:

$matches array

Returns:: string

Definition at line 3778 of file Database.php.

DatabaseBase::indexUnique	(	$	table,
		$	index
	)

Determines if a given index is unique.

Parameters:

$table	string
$index	string

Returns:: bool

Definition at line 1733 of file Database.php.

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

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 DatabaseBase::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 DatabaseBase::affectedRows().

Parameters:

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

Returns:: bool

Reimplemented in DatabasePostgres, DatabaseSqlite, DatabaseOracle, and DatabaseMssql.

Definition at line 1786 of file Database.php.

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

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 DatabaseBase::addQuotes()
array	$conds	Condition array. See $conds in DatabaseBase::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 DatabaseBase::insert() for details.
array	$selectOptions	Options for the SELECT part of the query, see DatabaseBase::select() for details.

Returns:: ResultWrapper

Reimplemented in DatabasePostgres, DatabaseOracle, and DatabaseMssql.

Definition at line 2801 of file Database.php.

DatabaseBase::installErrorHandler ( ) [protected]

Definition at line 801 of file Database.php.

Referenced by DatabasePostgres\open().

DatabaseBase::isOpen ( )

Is a connection to the database open?

Returns:: Boolean

Definition at line 576 of file Database.php.

DatabaseBase::isQuotedIdentifier ( $ name )

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

Parameters:

$name string

Returns:: boolean

Reimplemented in DatabaseOracle, DatabaseMssql, and DatabaseMysqlBase.

Definition at line 2385 of file Database.php.

DatabaseBase::isView ( $ name )

Differentiates between a TABLE and a VIEW.

Parameters:

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

Exceptions:

MWException

Since:: 1.22

Definition at line 3392 of file Database.php.

Referenced by DatabaseMysqlBaseTest\testIsView().

DatabaseBase::isWriteQuery ( $ sql )

Determine whether a query writes to the DB.

Should return true if unsure.

Parameters:

$sql string

Returns:: bool

Reimplemented in DatabaseSqlite.

Definition at line 900 of file Database.php.

DatabaseBase::lastQuery ( )

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

Returns:: String

Definition at line 546 of file Database.php.

Referenced by MockDatabaseSqlite\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
	$limit	Integer the SQL limit
	$offset	Integer\|bool the SQL offset (default false)

Exceptions:

DBUnexpectedError

Returns:: string

Reimplemented in DatabasePostgres, DatabaseOracle, and DatabaseMssql.

Definition at line 2859 of file Database.php.

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

Reimplemented in DatabasePostgres, DatabaseMysqlBase, DatabaseSqlite, and DatabaseOracle.

Definition at line 3358 of file Database.php.

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

Since:: 1.22

Reimplemented in DatabaseMysqlBase.

Definition at line 3381 of file Database.php.

Referenced by DatabaseMysqlBaseTest\testListviews().

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

Acquire a named lock.

Abstracted from Filestore::lock() so child classes can implement for their own needs.

Parameters:

string	$lockName	name of lock to aquire
string	$method	name of method calling us
	$timeout	Integer: timeout

Returns:: Boolean

Reimplemented in DatabasePostgres, and DatabaseMysqlBase.

Definition at line 3805 of file Database.php.

DatabaseBase::lockIsFree	(	$	lockName,
		$	method
	)

Check to see if a named lock is available.

This is non-blocking.

Parameters:

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

Returns:: Boolean

Since:: 1.20

Reimplemented in DatabasePostgres, and DatabaseMysqlBase.

Definition at line 3790 of file Database.php.

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

Lock specific tables.

Parameters:

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

Returns:: bool

Reimplemented in DatabaseMysqlBase.

Definition at line 3833 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

Reimplemented in DatabaseMysqlBase.

Definition at line 2742 of file Database.php.

Referenced by makeUpdateOptions().

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 1311 of file Database.php.

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

DatabaseBase::makeInsertOptions ( $ options ) [protected]

Helper for DatabaseBase::insert().

Parameters:

$options array

Returns:: string

Reimplemented in DatabaseSqlite.

Definition at line 1749 of file Database.php.

References $options.

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 DatabaseBase::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

Definition at line 1911 of file Database.php.

Referenced by DatabasePostgres\insert(), DatabasePostgres\insertSelect(), and DatabaseMssql\tableNamesWithUseIndexOrJOIN().

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 1336 of file Database.php.

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

Reimplemented in DatabasePostgres, DatabaseOracle, DatabaseMssql, and DatabaseSqlite.

Definition at line 1227 of file Database.php.

DatabaseBase::makeUpdateOptions ( $ options ) [protected]

Make UPDATE options for the DatabaseBase::update function.

Parameters:

array $options The options passed to DatabaseBase::update

Returns:: string

Reimplemented in DatabaseSqlite.

Definition at line 1844 of file Database.php.

References $options, array(), and lowPriorityOption().

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:: Mixed: string SQL fragment, or false if no items in array.

Definition at line 1976 of file Database.php.

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

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

Parameters:

$pos	DBMasterPos object
$timeout	Integer: the maximum number of seconds to wait for synchronisation

Returns:: integer: zero if the slave was past that position already, greater than zero if we waited for some period of time, less than zero if we timed out.

Reimplemented in DatabaseMysqlBase.

Definition at line 3041 of file Database.php.

DatabaseBase::maxListLen ( )

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

Returns:: int

Definition at line 3488 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	$rows	Rows to insert
string	$fname	Caller function name

Returns:: ResultWrapper

Reimplemented in DatabaseTestHelper.

Definition at line 2559 of file Database.php.

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:

$seqName string

Returns:: null

Reimplemented in DatabasePostgres, DatabaseOracle, and DatabaseMssql.

Definition at line 2462 of file Database.php.

DatabaseBase::onTransactionIdle ( $ callback ) [final]

Run an anonymous function 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.

Parameters:

callable $callback

Since:: 1.20

Definition at line 3112 of file Database.php.

DatabaseBase::onTransactionPreCommitOrIdle ( $ callback ) [final]

Run an anonymous function 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.

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.

Parameters:

callable $callback

Since:: 1.22

Definition at line 3130 of file Database.php.

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 3580 of file Database.php.

DatabaseBase::ping ( )

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

Returns:: bool Success or failure

Reimplemented in DatabaseMysqlBase.

Definition at line 3465 of file Database.php.

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:

$sql	string
$func	string

Returns:: array

Definition at line 1084 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:

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

Exceptions:

MWException

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

Reimplemented in DatabaseTestHelper, and MockDatabaseSqlite.

Definition at line 926 of file Database.php.

DatabaseBase::realTimestamps ( )

Returns true if this database uses timestamps rather than integers.

Returns:: bool

Reimplemented in DatabasePostgres, DatabaseOracle, and DatabaseMssql.

Definition at line 500 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	$rows	Can be either a single row to insert, or multiple rows, in the same format as for DatabaseBase::insert()
array	$uniqueIndexes	is an array of indexes. Each element may be either a field name or an array of field names
string	$fname	Calling function name (use __METHOD__) for logs/profiling

Reimplemented in DatabaseSqlite, and DatabaseMysqlBase.

Definition at line 2502 of file Database.php.

DatabaseBase::replaceSchemaVars ( $ 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 (eg: 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.
/ *$var* / is just encoded, besides traditional table prefix and table options its use should be avoided.

Parameters:

string $ins SQL statement to replace variables in

Returns:: String The new SQL statement with variables replaced

Definition at line 3700 of file Database.php.

DatabaseBase::replaceVars ( $ ins ) [protected]

Replace variables in sourced SQL.

Parameters:

$ins string

Returns:: string

Reimplemented in DatabasePostgres, DatabaseSqlite, and MockDatabaseSqlite.

Definition at line 3720 of file Database.php.

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

Parameters:

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

Exceptions:

DBConnectionError

Definition at line 874 of file Database.php.

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:

$error	String
$errno	Integer
$sql	String
$fname	String
$tempIgnore	Boolean

Exceptions:

DBQueryError

Reimplemented in DatabaseOracle, and DatabasePostgres.

Definition at line 1054 of file Database.php.

DatabaseBase::restoreErrorHandler ( ) [protected]

Returns:: bool|string

Definition at line 810 of file Database.php.

Referenced by DatabasePostgres\open().

DatabaseBase::resultObject ( $ result )

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. For compatibility with old code, ResultWrapper objects are passed through unaltered.

Parameters:

$result bool|ResultWrapper

Returns:: bool|ResultWrapper

Definition at line 3447 of file Database.php.

DatabaseBase::rollback ( $ fname = __METHOD__ ) [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:

$fname string

Definition at line 3303 of file Database.php.

Referenced by DatabasePostgres\reportQueryError().

DatabaseBase::runOnTransactionIdleCallbacks ( ) [protected]

Actually any "on transaction idle" callbacks.

Since:: 1.20

Definition at line 3143 of file Database.php.

DatabaseBase::runOnTransactionPreCommitCallbacks ( ) [protected]

Actually any "on transaction pre-commit" callbacks.

Since:: 1.22

Definition at line 3170 of file Database.php.

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

Reimplemented in DatabasePostgres, and DatabaseOracle.

Definition at line 529 of file Database.php.

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

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
	$join_conds	Array Join conditions
	$table	string\|array

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.

Parameters:

$vars string|array

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.

Parameters:

$conds string|array

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, such that the field name may match any of the elements in the array. The elements of the array 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:

Parameters:

$options string|array

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:

$join_conds string|array

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 an SQL fragment giving the join condition for that table. For example:

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

Returns:: ResultWrapper. 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.

Reimplemented in DatabaseMssql.

Definition at line 1485 of file Database.php.

Referenced by DatabasePostgres\estimateRowCount(), and RefreshImageMetadata\execute().

DatabaseBase::selectDB ( $ db )

Change the current database.

Todo:: Explain what exactly will fail if this is not overridden.

Parameters:

$db

Returns:: bool Success or failure

Reimplemented in DatabaseOracle, DatabaseMssql, DatabasePostgres, DatabaseMysqli, and DatabaseMysql.

Definition at line 2051 of file Database.php.

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

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 DatabaseBase::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 DatabaseBase::select() for details.
string	$fname	The function name of the caller.
string \| array	$options	The query options. See DatabaseBase::select() for details.

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

Definition at line 1194 of file Database.php.

Referenced by DatabasePostgres\roleExists(), DatabasePostgres\ruleExists(), and DatabasePostgres\schemaExists().

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

Single row SELECT wrapper.

Equivalent to DatabaseBase::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
	$join_conds	array\|string Join conditions

Returns:: object|bool

Reimplemented in DatabaseOracle.

Definition at line 1573 of file Database.php.

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

The equivalent of DatabaseBase::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
	$join_conds	string\|array Join conditions

Returns:: string SQL query string.

See also:: DatabaseBase::select()

Reimplemented in DatabasePostgres, and DatabaseMssql.

Definition at line 1508 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:

$value Mixed: true for allow, false for deny, or "default" to restore the initial value

Reimplemented in DatabaseMysqlBase.

Definition at line 3921 of file Database.php.

DatabaseBase::setFakeMaster ( $ enabled = true )

Make this connection a fake master.

Parameters:

$enabled bool

Reimplemented in DatabasePostgres, and DatabaseOracle.

Definition at line 463 of file Database.php.

DatabaseBase::setFakeSlaveLag ( $ lag )

Set lag time in seconds for a fake slave.

Parameters:

$lag int

Definition at line 454 of file Database.php.

DatabaseBase::setFileHandle ( $ fh )

Set the filehandle to copy write statements to.

Parameters:

$fh	filehandle

Definition at line 408 of file Database.php.

DatabaseBase::setFlag ( $ flag )

Set a flag for this connection.

Parameters:

$flag

Integer: 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

Definition at line 591 of file Database.php.

Referenced by DatabaseOracle\open().

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:

$name
$value

Definition at line 441 of file Database.php.

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.

Definition at line 3598 of file Database.php.

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:

$options Array

Returns:: void

Reimplemented in DatabaseMysqlBase.

Definition at line 3525 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	Callback: Optional function called for each complete line sent

Exceptions:

MWException
Exception\|MWException

Returns:: bool|string

Definition at line 3544 of file Database.php.

Referenced by DatabaseSqliteTest\prepareDB().

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:

	$fp	Resource: File handle
	$lineCallback	Callback: Optional function called before reading each query
	$resultCallback	Callback: Optional function called for each MySQL result
string	$fname	Calling function name
	$inputCallback	Callback: Optional function called for each complete query sent

Returns:: bool|string

Reimplemented in DatabaseOracle.

Definition at line 3615 of file Database.php.

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

Reimplemented in DatabasePostgres, and DatabaseMysqlBase.

Definition at line 3672 of file Database.php.

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

Reimplemented in DatabasePostgres, DatabaseOracle, and DatabaseMssql.

Definition at line 491 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

Definition at line 2916 of file Database.php.

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

Query whether a given table exists.

Parameters:

$table	string
$fname	string

Returns:: bool

Reimplemented in DatabaseOracle, and DatabaseTestHelper.

Definition at line 1702 of file Database.php.

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.

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

Reimplemented in DatabasePostgres, DatabaseOracle, and DatabaseSqlite.

Definition at line 2090 of file Database.php.

Referenced by DatabaseMssql\fieldExists(), DatabaseMssql\fieldInfo(), DatabaseMssql\insert(), DatabaseMssql\tableNamesWithUseIndexOrJOIN(), and DatabaseMssql\textFieldSize().

DatabaseBase::tableNameCallback ( $ matches ) [protected]

Table name callback.

Parameters:

$matches array

Returns:: string

Definition at line 3767 of file Database.php.

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 2162 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 2184 of file Database.php.

DatabaseBase::tableNamesWithAlias ( $ tables )

Gets an array of aliased table names.

Parameters:

$tables array( [alias] => table )

Returns:: array of strings, see tableNameWithAlias()

Definition at line 2217 of file Database.php.

DatabaseBase::tableNamesWithUseIndexOrJOIN	(	$	tables,
		$	use_index = `array()`,
		$	join_conds = `array()`
	)		`[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 )
	$use_index	array Same as for select()
	$join_conds	array Same as for select()

Returns:: string

Reimplemented in DatabaseMssql.

Definition at line 2270 of file Database.php.

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 2203 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.

Definition at line 399 of file Database.php.

Referenced by DatabaseSqliteStandalone\__construct().

DatabaseBase::textFieldSize	(	$	table,
		$	field
	)

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

Parameters:

$table	string
$field	string

Returns:: int

Reimplemented in DatabasePostgres, DatabaseOracle, DatabaseMssql, and DatabaseSqlite.

Definition at line 2717 of file Database.php.

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:

$ts	string\|int

Returns:: string

Reimplemented in DatabasePostgres, DatabaseOracle, and DatabaseMssql.

Definition at line 3407 of file Database.php.

Referenced by encodeExpiry().

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:

$ts	string\|int

Returns:: string

Definition at line 3424 of file Database.php.

DatabaseBase::trxLevel ( $ level = null )

Gets or sets the current transaction level.

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

Parameters:

int $level An integer (0 or 1), or omitted to leave it unchanged.

Returns:: int The previous value

Definition at line 381 of file Database.php.

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
	$all	Boolean: use UNION ALL

Returns:: String: SQL fragment

Reimplemented in DatabaseOracle, and DatabaseSqlite.

Definition at line 2885 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:: Boolean

Reimplemented in DatabaseSqlite, and DatabaseMssql.

Definition at line 2873 of file Database.php.

DatabaseBase::unlock	(	$	lockName,
		$	method
	)

Release a lock.

Parameters:

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

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

Reimplemented in DatabasePostgres, and DatabaseMysqlBase.

Definition at line 3819 of file Database.php.

DatabaseBase::unlockTables ( $ method )

Unlock specific tables.

Parameters:

string $method the caller

Returns:: bool

Reimplemented in DatabaseMysqlBase.

Definition at line 3844 of file Database.php.

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

UPDATE wrapper.

Takes a condition array and a SET array.

Parameters:

	$table	String 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 DatabaseBase::addQuotes().
	$conds	Array: An array of conditions (WHERE). See DatabaseBase::select() for the details of the format of condition arrays. Use '*' to update all rows.
	$fname	String: 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:: Boolean

Reimplemented in DatabaseOracle.

Definition at line 1885 of file Database.php.

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.

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 DatabaseBase::addQuotes().
string	$fname	Calling function name (use __METHOD__) for logs/profiling
array	$options	of options

Returns:: bool

Since:: 1.22

Reimplemented in DatabaseMysqlBase, and DatabaseOracle.

Definition at line 2618 of file Database.php.

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:

$index

Returns:: string

Reimplemented in DatabaseMysqlBase.

Definition at line 2476 of file Database.php.

Referenced by DatabaseMssql\tableNamesWithUseIndexOrJOIN().

DatabaseBase::wasDeadlock ( )

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

Returns:: bool

Reimplemented in DatabasePostgres, DatabaseMysqlBase, DatabaseOracle, and DatabaseSqlite.

Definition at line 2936 of file Database.php.

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

Reimplemented in DatabaseMysqlBase, and DatabaseSqlite.

Definition at line 2957 of file Database.php.

DatabaseBase::wasLockTimeout ( )

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

Returns:: bool

Reimplemented in DatabaseMysqlBase.

Definition at line 2946 of file Database.php.

DatabaseBase::wasReadOnlyError ( )

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

STUB

Returns:: bool

Reimplemented in DatabaseMysqlBase, and DatabaseSqlite.

Definition at line 2967 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

Definition at line 566 of file Database.php.

Member Data Documentation

Process DatabaseBase::$allViews = null [protected]

Since:: 1.22 cache of VIEWs names in the database

Definition at line 287 of file Database.php.

DatabaseBase::$delimiter = ';' [protected]

Definition at line 255 of file Database.php.

file DatabaseBase::$fileHandle = null [protected]

Since:: 1.21 handle for upgrade

Definition at line 282 of file Database.php.

DatabaseBase::$htmlErrors [protected]

Definition at line 253 of file Database.php.

DatabaseBase::$mConn = null [protected]

Reimplemented in DatabaseSqlite.

Definition at line 235 of file Database.php.

DatabaseBase::$mDBname

Definition at line 233 of file Database.php.

DatabaseBase::$mDefaultBigSelects = null [protected]

Definition at line 248 of file Database.php.

DatabaseBase::$mDoneWrites = false [protected]

Definition at line 230 of file Database.php.

DatabaseBase::$mErrorCount = 0 [protected]

Definition at line 245 of file Database.php.

DatabaseBase::$mFakeMaster = false

Definition at line 247 of file Database.php.

DatabaseBase::$mFakeSlaveLag = null [protected]

Definition at line 247 of file Database.php.

DatabaseBase::$mFlags [protected]

Definition at line 242 of file Database.php.

DatabaseBase::$mForeign [protected]

Definition at line 243 of file Database.php.

DatabaseBase::$mLastQuery = '' [protected]

Definition at line 229 of file Database.php.

DatabaseBase::$mLBInfo = array() [protected]

Definition at line 246 of file Database.php.

DatabaseBase::$mOpened = false [protected]

Definition at line 236 of file Database.php.

DatabaseBase::$mPassword

Definition at line 233 of file Database.php.

DatabaseBase::$mPHPError = false [protected]

Definition at line 231 of file Database.php.

DatabaseBase::$mSchemaVars = false [protected]

Definition at line 249 of file Database.php.

DatabaseBase::$mServer [protected]

Definition at line 233 of file Database.php.

DatabaseBase::$mTablePrefix [protected]

Definition at line 241 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 277 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 270 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 263 of file Database.php.

callable [] DatabaseBase::$mTrxIdleCallbacks = array() [protected]

*

Definition at line 238 of file Database.php.

DatabaseBase::$mTrxLevel = 0 [protected]

Definition at line 244 of file Database.php.

callable [] DatabaseBase::$mTrxPreCommitCallbacks = array() [protected]

*

Definition at line 239 of file Database.php.

DatabaseBase::$mUser

Definition at line 233 of file Database.php.

DatabaseBase::$preparedArgs [protected]

Definition at line 251 of file Database.php.

const DatabaseBase::DEADLOCK_DELAY_MAX = 1500000

Maximum time to wait before retry.

Definition at line 223 of file Database.php.

const DatabaseBase::DEADLOCK_DELAY_MIN = 500000

Minimum time to wait before retry, in microseconds.

Definition at line 221 of file Database.php.

const DatabaseBase::DEADLOCK_TRIES = 4

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

Definition at line 219 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

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