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php+mysqli事务控制实现银行转账实例_php技巧

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Release: 2016-05-16 20:24:27
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本文实例讲述了php+mysqli事务控制实现银行转账的方法。分享给大家供大家参考。具体分析如下:

事务控制,也就是说所有的语句执行成功后,才会提交。否则,如果前面有语句执行成功,而后面没有执行成功,则回滚到执行之前的状态。通过银行转账的案例来说明这个应用。一个账号转了钱出去,另一个账号必须有钱转入,这样才算成功。

代码如下:

<&#63;php
//1、创建数据库连接对象
$mysqli = new MySQLi("localhost","root","123456","liuyan");
if($mysqli->connect_error){
 die($mysqli->connect_error);
}
$mysqli->query("set names 'GBK'");

$mysqli->autocommit(false);
//首先设置autocommit为false,也就是不自动提交

$sql1 = "update account set balance=balance-2 where id=1;";
$sql2 = "update account set balance=balance+2 where id=2;";
$res1 =$mysqli->query($sql1) or die($mysqli->error);
$res2 =$mysqli->query($sql2) or die($mysqli->error);

if(!$res1 || !$res2){
 echo "转账失败";
 $mysqli->rollback();//如果有一条不成功,则回滚
}else{
 $mysqli->commit();//两条语句都执行成功,则提交
 echo "转账成功";
}
&#63;>
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希望本文所述对大家的php程序设计有所帮助。

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