php+Mysqli利用事务处理转账问题实例

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。具体实现方法如下：

    <?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(); 
    ?>

希望本文所述对大家的php程序设计有所帮助。