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PDO transaction processing methods and example analysis in PHP
PDO transaction processing methods and example analysis in PHP
This article mainly introduces the transaction processing of PDO in PHP, combined with the example form to analyze the related skills of using PDO for transaction processing. Friends in need can refer to it
Transaction processing has four characteristics: atomicity , consistency, independence, and durability.
Not all databases support transaction processing. PDO provides transaction support for databases that can perform transaction processing.
Notes when configuring transaction processing:
1. Turn off the automatic submission of PDO;
$pdo->setAttribute(PDO::ATTR_AUTOCOMMIT, false);
2. The methods required to open a transaction ;
$pdo->beginTransaction(); // 开启一个事务 $pdo->commit(); // 提交事务 $pdo->rollback(); // 回滚事务
3. General transaction processing is run in the try...catch... statement. When the transaction fails, the catch code segment is executed.
<?php
try {
$pdo->beginTransaction(); // 开启一个事务
$row = null;
$row = $pdo->exec("xxx"); // 执行第一个 SQL
if (!$row)
throw new PDOException('提示信息或执行动作'); // 如出现异常提示信息或执行动作
$row = $pdo->exec("xxx"); // 执行第二个 SQL
if (!$row)
throw new PDOException('提示信息或执行动作');
$pdo->commit();
} catch (PDOException $e) {
$pdo->rollback(); // 执行失败，事务回滚
exit($e->getMessage());
}
?>If an error occurs in the SQL statement in the transaction, all SQL will not be executed. Only when all SQL statements are correct will they be submitted for execution.
Summary: The above is the entire content of this article, I hope it will be helpful to everyone's study.
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