Introduction - DSN -- The Data Source Name
Description
To connect to a database through PEAR::MDB2, you have to create a
valid DSN - data source name. This DSN
consists in the following parts:
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phptype:
Database backend used in PHP (i.e. mysql
, pgsql etc.)
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dbsyntax:
Database used with regards to SQL syntax etc.
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protocol:
Communication protocol to use ( i.e. tcp,
unix etc.)
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hostspec:
Host specification (hostname[:port])
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database:
Database to use on the DBMS server
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username:
User name for login
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password:
Password for login
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proto_opts:
Maybe used with protocol
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option:
Additional connection options in URI query string format.
options get separated by &.
The Following table shows a non complete list of options:
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Table 33-1. List of options
| Name | Description |
|---|
| charset |
Some backends support setting the client charset.
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| new_link |
Some RDBMS do not create new connections when connecting to the same host
multiple times. This option will attempt to force a new connection.
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The DSN can either be provided as an associative array or as a string.
The string format of the supplied DSN is in its fullest form:
phptype(dbsyntax)://username:password@protocol+hostspec/database?option=value |
Most variations are allowed:
phptype://username:password@protocol+hostspec:110//usr/db_file.db
phptype://username:password@hostspec/database
phptype://username:password@hostspec
phptype://username@hostspec
phptype://hostspec/database
phptype://hostspec
phptype:///database
phptype:///database?option=value&anotheroption=anothervalue
phptype(dbsyntax)
phptype |
The currently supported database backends are:
fbsql -> FrontBase
ibase -> InterBase (requires PHP 5)
mssql -> Microsoft SQL Server (NOT for Sybase. Compile PHP --with-mssql)
mysql -> MySQL
mysqli -> MySQL (supports new authentication protocol) (requires PHP 5)
oci8 -> Oracle 7/8/9
pgsql -> PostgreSQL
querysim -> QuerySim
sqlite -> SQLite |
A second DSN format is supported
phptype(syntax)://user:pass@protocol(proto_opts)/database |
If your database, option values,
username or password
contain characters used to delineate DSN parts, you
can escape them via URI hex encodings:
: = %3a / = %2f @ = %40
+ = %2b ( = %28 ) = %29
? = %3f = = %3d & = %26 |
| Warning |
Please note, that some features may be not supported by all
database backends.
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