(PECL ibm_db2:1.0-1.6.2)
db2_pconnect — Returns a persistent connection to a database
Returns a persistent connection to an IBM DB2 Universal Database, IBM Cloudscape, or Apache Derby database. For more information on persistent connections, refer to 数据库永久连接.
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.
The database alias in the DB2 client catalog.
The username with which you are connecting to the database.
The password with which you are connecting to the database.
An associative array of connection options that affect the behavior of the connection, where valid array keys include:
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.
Passing the DB2_CASE_NATURAL value specifies that column names are returned in natural case.
Passing the DB2_CASE_LOWER value specifies that column names are returned in lower case.
Passing the DB2_CASE_UPPER value specifies that column names are returned in upper case.
Passing the DB2_FORWARD_ONLY value specifies a forward-only cursor for a statement resource. This is the default cursor type and is supported on all database servers.
Passing the DB2_SCROLLABLE value specifies a scrollable cursor for a statement resource. This mode enables random access to rows in a result set, but currently is supported only by IBM DB2 Universal Database.
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.
Example#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.";
}
?>
上例将输出：
Persistent connection succeeded. Second persistent connection succeeded.