php+Mysqli利用事务处理转账问题实例

<?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(); ?>