php+Mysqli利用事务处理转账问题实例

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<?php

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

$mysqli = new mysqli("localhost", "root", "064319", "php");

$mysqli->set_charset("utf8");

if($mysqli->connect_errno) {

die('数据库连接失败'.$mysqli->connect_error);

}

$mysqli->autocommit(false); //自动提交模式设为false

$flag = true; //事务是否成功执行的标志

$query = "update account set balance=balance-1000 where id=3";

$result = $mysqli->query($query);

$affected_count = $mysqli->affected_rows;

if(!result || $affected_count == 0) { //失败

$flag = false;

}

$query = "update account set balance=balance+1000 where id=2";

$result = $mysqli->query($query);

$affected_count = $mysqli->affected_rows;

if(!$result || $affected_count == 0) {

$flag = false;

}

if($flag) {

$mysqli->commit();

echo '转账成功';

} else {

$mysqli->rollback();

echo '转账失败';

}

$mysqli->autocommit(true); //重新设置事务为自动提交

$mysqli->close();

?>