php利用事务处理转账问题
本文实例讲述了php+Mysqli利用事务处理转账问题的方法。分享给大家供大家参考
<?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(); ?>
代码二:
<?php try{ $pdo=new PDO("mysql:host=localhost;dbname=psp","root",""); $pdo->exec("set names utf8"); $pdo->setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_EXCEPTION);//设置异常处理模式 $pdo->setAttribute(PDO::ATTR_AUTOCOMMIT,0);//关闭自动提交 }catch(PDOException $e){ echo "数据库连接失败"; exit; } try{ $age=10; $pdo->beginTransaction();//开始事务 $affected_rows1=$pdo->exec("update kfry set k_age=k_age+{$age} where k_name='user1'"); $affected_rows2=$pdo->exec("update kfry set k_age=k_age-{$age} where k_name='user2'");//随意更改使之执行成功或失败 /* if($affected_rows1&&$affected_rows2) { $pdo->commit(); echo "操作成功"; }else{ $pdo->rollback(); } */ if(!$affected_rows1) throw new PDOException("加入错误"); if(!$affected_rows2) throw new PDOException("减少错误"); echo "操作成功"; $pdo->commit();//如果执行到此处前面两个更新sql语句执行成功,整个事务执行成功 }catch(PDOException $e){ echo "操作失败:".$e->getMessage(); $pdo->rollback();//执行事务中的语句出了问题,整个事务全部撤销 } $pdo->setAttribute(PDO::ATTR_AUTOCOMMIT,1); //测试是否成功 echo "\n操作结果为:\n"; $sql="select * from kfry"; $result=$pdo->query($sql); foreach($result as $v) { echo $v['k_name']." ".$v['k_age']."\n"; } ?>
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