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
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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(); ?> |
代码二:
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<?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" ; } ?> |
以上所述就是本文的全部内容了,希望大家能够喜欢。