XCIII. ODBC and DB2 functions (PDO_ODBC)

Einführung

Warnung

Diese Erweiterung ist EXPERIMENTELL. Das Verhalten dieser Erweiterung, einschließlich der Funktionsnamen, und alles Andere was hier dokumentiert ist, kann sich in zukünftigen PHP-Versionen ohne Ankündigung ändern. Seien Sie gewarnt und verwenden Sie diese Erweiterung auf eigenes Risiko.

PDO_ODBC is a driver that implements the PHP Data Objects (PDO) interface to enable access from PHP to databases through ODBC drivers or through the IBM DB2 Call Level Interface (DB2 CLI) library.

On Windows, PDO_ODBC is built into the PHP core by default. It is linked against the Windows ODBC Driver Manager so that PHP can connect to any database cataloged as a System DSN, and is the recommended driver for connecting to Microsoft SQL Server databases.

Laufzeit Konfiguration

Das Verhalten dieser Funktionen wird durch Einstellungen in der php.ini beeinflusst.

Tabelle 1. PDO_ODBC Configuration Options

NameDefaultChangeableChangelog
pdo_odbc.connection_pooling"strict"PHP_INI_ALL 
For further details and definitions of the PHP_INI_* constants, see the Anhang G.

Hier eine kurze Erklärung der Konfigurationsoptionen:

pdo_odbc.connection_pooling string

Whether to pool ODBC connections. Can be one of "strict", "relaxed" or "off" (equals to ""). The parameter describes how strict the connection manager should be when matching connection parameters to existing pooled connections. strict is the recommend default, and will result in the use of cached connections only when all the connection parameters match exactly. relaxed will result in the use of cached connections when similar connection parameters are used. This can result in increased use of the cache, at the risk of bleeding connection information between (for example) virtual hosts.

This setting can only be changed from the php.ini file, and affects the entire process; any other modules loaded into the process that use the same ODBC libraries will be affected too, including the Unified ODBC extension.

Warnung

relaxed matching should not be used on a shared server, for security reasons.

Tipp: Leave this setting at the default strict setting unless you have good reason to change it.

Inhaltsverzeichnis
PDO_ODBC DSN -- Connecting to ODBC or DB2 databases