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php中mysql事务回滚无效怎么办

Jun 06, 2016 pm 08:50 PM
mysql php affairs

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

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(&#39;mysql:host=localhost;dbname=data&#39;,&#39;root&#39;,&#39;root&#39;);
    $pdo->exec(&#39;set names utf8&#39;);
    $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 = &#39;delete from books where bId=40&#39;;
        $smt = $pdo->prepare($sql);
        $smt->execute();
        #第二次操作
        $sql = &#39;delete from1 books where bId=39&#39;;
        $smt = $pdo->prepare($sql);
        $smt->execute();
        #成功提交
        $pdo->commit();
    }catch(PDOException $e){
        echo $e->getMessage().&#39;<br>&#39;.$e->getLine();
        #失败撤回
        $pdo->rollBack();
    }
 ?>
Copy after login

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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