Hướng dẫn dùng define rollback trong PHP

[PHP 5 >= 5.1.0, PHP 7, PHP 8, PECL pdo >= 0.1.0]

PDO::rollBack — Rolls back a transaction

Description

public PDO::rollBack[]: bool

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.

Parameters

This function has no parameters.

Return Values

Returns true on success or false on failure.

Errors/Exceptions

Throws a PDOException if there is no active transaction.

Note: An exception is raised even when the PDO::ATTR_ERRMODE attribute is not PDO::ERRMODE_EXCEPTION.

Examples

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.