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# oci_pconnect

(PHP 5)

oci_pconnect -- Connect to an Oracle database using a persistent connection

## Description

resource oci_pconnect ( string username, string password [, string db [, string charset [, int session_mode]]] )

oci_pconnect() creates a persistent connection to an Oracle server and logs on. Persistent connections are cached and re-used between requests, resulting in reduced overhead on each page load; a typical PHP application will have a single persistent connection open against an Oracle server per Apache child process (or PHP FastCGI/CGI process). See the Persistent Database Connections section for more information.

> 注: Starting with version 1.1 of the oci8 extension, the lifetime and maximum amount of persistent Oracle connections can be tuned by setting the following configuration values: oci8.persistent_timeout, oci8.ping_interval and oci8.max_persistent.

The optional third parameter can either contain the name of the local Oracle instance or the name of the entry in `tnsnames.ora`. If the third parameter is not specified, PHP uses environment variables ORACLE_SID and TWO_TASK to determine the name of local Oracle instance and location of `tnsnames.ora` accordingly.

Parameter session_mode is available since version 1.1 and accepts the following values: `OCI_DEFAULT`, `OCI_SYSOPER` and `OCI_SYSDBA`. If either `OCI_SYSOPER` or `OCI_SYSDBA` were specified, oci_connect() will try to establish privileged connection using external credentials. Privileged connections are disabled by default. To enable them you need to set oci8.privileged_connect to On.

> 注: If you're using PHP with Oracle Instant Client, you can use easy connect naming method described here: http://download-west.oracle.com/docs/cd/B12037_01/network.101/b10775/naming.htm#i498306. Basically this means you can specify "//db_host[:port]/database_name" as database name. But if you want to use the old way of naming you must set either `ORACLE_HOME` or `TNS_ADMIN`.

Using Oracle server version 9.2 and greater, you can indicate charset parameter, which will be used in the new connection. If you're using Oracle server < 9.2, this parameter will be ignored and NLS_LANG environment variable will be used instead.

oci_pconnect() returns connection identifier or `FALSE` on error.

> 注: In PHP versions before 5.0.0 you must use ociplogon() instead. This name still can be used, it was left as alias of oci_pconnect() for downwards compatability. This, however, is deprecated and not recommended.

See also oci_connect() and oci_new_connect().

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