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# db2_pconnect

(PECL)

db2_pconnect -- Returns a persistent connection to a database

## 説明

resource db2_pconnect ( string database, string username, string password [, array options] )

Returns a persistent connection to an IBM DB2 Universal Database, IBM Cloudscape, or Apache Derby database. For more information on persistent connections, refer to 第41章.

Calling db2_close() on a persistent connection always returns `TRUE`, but the underlying DB2 client connection remains open and waiting to serve the next matching db2_pconnect() request.

Note that you are strongly urged to only use persistent connections on connections with autocommit turned on. If you attempt to combine transactions with persistent connections, issuing db2_commit() or db2_rollback() against a persistent connection will affect every persistent connection that is currently using the same underlying DB2 client connection. You may also rapidly experience locking escalation if you do not use autocommit for your persistent connections.

## パラメータ

database

  The database alias in the DB2 client catalog.

username

  The username with which you are connecting to the database.

password

  The password with which you are connecting to the database.

options

  An associative array of connection options that affect the behavior of the connection, where valid array keys include:

  autocommit

    Passing the DB2_AUTOCOMMIT_ON value turns autocommit on for this connection handle.

    Passing the DB2_AUTOCOMMIT_OFF value turns autocommit off for this connection handle.

## 返り値

Returns a connection handle resource if the connection attempt is successful. db2_pconnect() tries to reuse an existing connection resource that exactly matches the database, username, and password parameters. If the connection attempt fails, db2_pconnect() returns `FALSE`.

## 例

例 1. A db2_pconnect() example

In the following example, the first call to db2_pconnect() returns a new persistent connection resource. The second call to db2_pconnect() returns a persistent connection resource that simply reuses the first persistent connection resource.

`<?php
$database = 'SAMPLE';
$user = 'db2inst1';
$password = 'ibmdb2';
$pconn = db2_pconnect($database, $user, $password);
if ($pconn) {
echo "Persistent connection succeeded.";
}
else {
echo "Persistent connection failed.";
}
$pconn2 = db2_pconnect($database, $user, $password);
if ($pconn) {
echo "Second persistent connection succeeded.";
}
else {
echo "Second persistent connection failed.";
}
?>`

上の例の出力は以下となります。

    Persistent connection succeeded.
    Second persistent connection succeeded.

## 参考

db2_connect()

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