php中mysql事务回滚无效怎么办
php中mysql事务回滚无效是因为数据库引擎设置为“MyISAM”了,该引擎是不支持事务回滚的,所以产生事务回滚无效,其解决办法就是将引擎更换为“InnoDB”即可恢复正常。
php中mysql事务回滚无效怎么办?
我的测试环境:AppServ
<?php header("Content-type:text/html;charset=utf-8"); $pdo = new PDO('mysql:host=localhost;dbname=data','root','root'); $pdo->exec('set names utf8'); $pdo->setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_EXCEPTION);#修改报错模式 #开启事务 $pdo->beginTransaction(); try{ #第一次操作 $sql = 'delete from books where bId=40'; $smt = $pdo->prepare($sql); $smt->execute(); #第二次操作 $sql = 'delete from1 books where bId=39'; $smt = $pdo->prepare($sql); $smt->execute(); #成功提交 $pdo->commit(); }catch(PDOException $e){ echo $e->getMessage().'<br>'.$e->getLine(); #失败撤回 $pdo->rollBack(); } ?>
如上:第二次操作出错的情况下 第一条操作没有被回滚
这时候赶紧去看看你的数据库引擎,你肯定看到是MyISAM,很不幸这个引擎不支持事务回滚。切换到 InnoDB 即可 。
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