PHP+Mysql基于事务处理实现转账功能的方法

本文实例讲述了PHP+Mysql基于事务处理实现转账功能的方法。分享给大家供大家参考。具体如下：

<?php

header("Content-Type:text/html;charset=utf-8");

$mysqli=new mysqli("localhost","root","","test");

if(mysqli_connect_errno())

{

printf("连接失败:%s<br>",mysqli_connect_error());

exit();

}

$success=TRUE;

$price=8000;

$result=$mysqli->query("select cash from account where name='userA'");

while($row=$result->fetch_assoc())

{

$value=$row["cash"];

echo $value;

}

$mysqli->autocommit(0);

if($value>=$price){

$result=$mysqli->query("UPDATE account set cash=cash-$price where name='userA'");

}else {

echo '余额不足';

exit();

}

if(!$result or $mysqli->affected_rows!=1)

{

$success=FALSE;

}

$result=$mysqli->query("UPDATE account set cash=cash+$price where name='userB'");

if(!result or $mysqli->affected_rows!=1){

$success=FALSE;

}

if($success)

{

$mysqli->commit();

echo '转账成功!';

}else

{

$mysqli->rollback();

echo "转账失败!";

}

$mysqli->autocommit(1);

$query="select cash from account where name=?";

$stmt=$mysqli->prepare($query);

$stmt->bind_param('s',$name);

$name='userA';

$stmt->execute();

$stmt->store_result();

$stmt->bind_result($cash);

while($stmt->fetch())

echo "用户userA的值为：".$cash;

$mysqli->close();

?>

数据库SQL语句如下：

create table account{

userID smallint unsigned not null auto_increment,

name varchar(45) not null,

cash decimal(9,2) not null,

primary key(userID)

)type=InnoDB;

insert into account(name,cash) values ('userA','2000');

insert into account(name,cash) values ('userB','10000');

希望本文所述对大家的php程序设计有所帮助。