db2_pconnect
(PECL ibm_db2:1.0-1.6.2)
db2_pconnect — Returns a persistent connection to a database
说明
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.
参数
- 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.
- DB2_ATTR_CASE
-
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.
- CURSOR
-
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.
返回值
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.
范例
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.
CDN