PDO->rollBack()

(PHP 5 >= 5.1.0, PECL pdo:0.1-1.0.3)

PDO->rollBack() — Rolls back a transaction

说明

PDO

bool rollBack ( void )

Rolls back the current transaction, as initiated by PDO->beginTransaction(). It is an error to call this method if no transaction is active.

If the database was set to autocommit mode, this function will restore autocommit mode after it has rolled back the transaction.

Some databases, including MySQL, automatically issue an implicit COMMIT when a database definition language (DDL) statement such as DROP TABLE or CREATE TABLE is issued within a transaction. The implicit COMMIT will prevent you from rolling back any other changes within the transaction boundary.

返回值

如果成功则返回 TRUE，失败则返回 FALSE。

范例

Example#1 Roll back a transaction

The following example begins a transaction and issues two statements that modify the database before rolling back the changes. On MySQL, however, the DROP TABLE statement automatically commits the transaction so that none of the changes in the transaction are rolled back.


<?php
/* Begin a transaction, turning off autocommit */
$dbh->beginTransaction();

/* Change the database schema and data */
$sth = $dbh->exec("DROP TABLE fruit");
$sth = $dbh->exec("UPDATE dessert
    SET name = 'hamburger'");

/* Recognize mistake and roll back changes */
$dbh->rollBack();

/* Database connection is now back in autocommit mode */
?>


	PHP5中文手册 PDO->quote() PDO->setAttribute() PDO PHP Manual PDO->rollBack() (PHP 5 >= 5.1.0, PECL pdo:0.1-1.0.3) PDO->rollBack() — Rolls back a transaction 说明 PDO bool rollBack ( void ) Rolls back the current transaction, as initiated by PDO->beginTransaction(). It is an error to call this method if no transaction is active. If the database was set to autocommit mode, this function will restore autocommit mode after it has rolled back the transaction. Some databases, including MySQL, automatically issue an implicit COMMIT when a database definition language (DDL) statement such as DROP TABLE or CREATE TABLE is issued within a transaction. The implicit COMMIT will prevent you from rolling back any other changes within the transaction boundary. 返回值如果成功则返回 `TRUE`，失败则返回 `FALSE`。范例 Example#1 Roll back a transaction The following example begins a transaction and issues two statements that modify the database before rolling back the changes. On MySQL, however, the DROP TABLE statement automatically commits the transaction so that none of the changes in the transaction are rolled back. `<?php /* Begin a transaction, turning off autocommit / $dbh->beginTransaction(); / Change the database schema and data / $sth = $dbh->exec("DROP TABLE fruit"); $sth = $dbh->exec("UPDATE dessert SET name = 'hamburger'"); / Recognize mistake and roll back changes / $dbh->rollBack(); / Database connection is now back in autocommit mode */ ?>` 参见 PDO->beginTransaction() PDO->commit() PDO->quote() PDO->setAttribute() PDO PHP Manual

PDO->rollBack()

说明

返回值

范例

参见