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This article analyzes the transaction processing of PDO in PHP through examples. Share it with everyone for your reference, the details are as follows:
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.
Note when configuring transaction processing:
1. Turn off automatic submission of PDO;
$pdo->setAttribute(PDO::ATTR_AUTOCOMMIT, false);
2. 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.
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I hope this article will be helpful to everyone in PHP programming.