IBM DB2 函数
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db2_rollback

(PECL ibm_db2 >= 1.0.0)

db2_rollback Rolls back a transaction

说明

bool db2_rollback ( resource $connection )

Rolls back an in-progress transaction on the specified connection resource and begins a new transaction. PHP applications normally default to AUTOCOMMIT mode, so db2_rollback() normally has no effect unless AUTOCOMMIT has been turned off for the connection resource.

Note: If the specified connection resource is a persistent connection, all transactions in progress for all applications using that persistent connection will be rolled back. For this reason, persistent connections are not recommended for use in applications that require transactions.

参数

connection

A valid database connection resource variable as returned from db2_connect() or db2_pconnect().

返回值

如果成功则返回 TRUE,失败则返回 FALSE

范例

Example #1 Rolling back a DELETE statement

In the following example, we count the number of rows in a table, turn off AUTOCOMMIT mode on a database connection, delete all of the rows in the table and return the count of 0 to prove that the rows have been removed. We then issue db2_rollback() and return the updated count of rows in the table to show that the number is the same as before we issued the DELETE statement. The return to the original state of the table demonstrates that the roll back of the transaction succeeded.

<?php
$conn 
db2_connect($database$user$password);

if (
$conn) {
    
$stmt db2_exec($conn"SELECT count(*) FROM animals");
    
$res db2_fetch_array$stmt );
    echo 
$res[0] . "\n";
    
    
// Turn AUTOCOMMIT off
    
db2_autocommit($connDB2_AUTOCOMMIT_OFF);
   
    
// Delete all rows from ANIMALS
    
db2_exec($conn"DELETE FROM animals");
    
    
$stmt db2_exec($conn"SELECT count(*) FROM animals");
    
$res db2_fetch_array$stmt );
    echo 
$res[0] . "\n";
    
    
// Roll back the DELETE statement
    
db2_rollback$conn );
    
    
$stmt db2_exec$conn"SELECT count(*) FROM animals" );
    
$res db2_fetch_array$stmt );
    echo 
$res[0] . "\n";
    
db2_close($conn);
}
?>

上例将输出:

7
0
7

参见


IBM DB2 函数
php 手册 | 脚本学堂 | 脚本编程 | 网站编程 | 系统管理 | 服务器配置 | 数据库管理 | Php教程 | python教程 | 正则表达式 | 批处理脚本 | Centos教程 | Linux基础教程