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Homephp教程php手册php下pdo的mysql事务处理用法实例

这篇文章主要介绍了php下pdo的mysql事务处理用法,以实例形式分析了基于pdo的事物提交与回滚操作的用法,具有一定的参考借鉴价值,需要的朋友可以参考下

本文实例讲述了php下pdo的mysql事务处理用法。分享给大家供大家参考。具体分析如下:

php+mysql事务处理的几个步骤:

1.关闭自动提交 2.开启事务处理 3.有异常就自动抛出异常提示再回滚 4.开启自动提交

注意:mysql只有这个InnoDB驱动是支持事务处理的,默认MyIsAM驱动不支持,下面是实例代码:

复制代码 代码如下:

    try{
        $pdo=new pdo("mysql:host=localhost;dbname=mydb", "root", "root", array(PDO::ATTR_AUTOCOMMIT=>0));//最后是关闭自动提交
        //$pdo->setAttribute(PDO::ATTR_AUTOCOMMIT, 0);//这个是通过设置属性方法进行关闭自动提交和上面的功能一样
        $pdo->setAttribute(PDO::ATTR_ERRMODE,  PDO::ERRMODE_EXCEPTION);//开启异常处理
    }catch(PDOException $e){
        echo "数据库连接失败:".$e->getMessage();
        exit;
    }
    /*
     * 事务处理
     *
     *   张三从李四那里买了一台 2000 元的电脑
     *     从张三帐号中扣出 2000元
     *     向李四账号中加入 2000元
     *     从商品表中减少一台电脑
     *     MyIsAM  InnoDB
     */
    try{
        $pdo->beginTransaction();//开启事务处理       
        $price=500;
        $sql="update zhanghao set price=price-{$price} where id=1";
        $affected_rows=$pdo->exec($sql);
        if(!$affected_rows)
            throw new PDOException("张三转出失败");//那个错误抛出异常
        $sql="update zhanghao set price=price+{$price} where id=3";
        $affected_rows=$pdo->exec($sql);      
        if(!$affected_rows)
            throw new PDOException("向李四转入失败");
        echo "交易成功!";
        $pdo->commit();//交易成功就提交
    }catch(PDOException $e){
        echo $e->getMessage();
        $pdo->rollback();
    }  
    $pdo->setAttribute(PDO::ATTR_AUTOCOMMIT, 1);//自动提交,,如果最后不自动提交,转账是不成功的  
    //设置错误报告模式 ERRMODE_SILENT    ERRMODE_WARNING
?>

希望本文所述对大家的php程序设计有所帮助。

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