MySQLi面向对象实践---事务处理

Posted 2020-10-08

在看这篇博客的时候，如果你有什么疑惑吗，可以参照一下这两篇博客

mysqli面向过程实践---事务处理http://www.cnblogs.com/-beyond/p/7577232.html

PDO实现事务处理http://www.cnblogs.com/-beyond/p/7551177.html

MySQLi面向对象的事务处理涉及以下三个函数

public bool mysqli::begin_transaction ([ int $flags [, string $name ]] )
bool mysqli::commit ( void )
bool mysqli::rollback ( void )

示例代码如下：

 最重要的莫过于关闭自动提交

 1 <?php 
 2     $db=new mysqli("localhost","root","root","test");
 3 
 4     $db->begin_transaction();
 5     $db->autocommit(FALSE);//重要
 6     try{
 7         $sql_1="delete from aaa where uid = 2;";
 8         $db->query($sql_1);
 9         if($db->affected_rows<=0){
10             throw new Exception("failed to delete data one\\n");
11             //如果操作一失败，则抛出异常，不会继续执行下个操作
12         }
13 
14         $sql_2="delete from aaa where uid = 999";
15         $db->query($sql_2);
16         if($db->affected_rows<=0){
17             throw new Exception("failed to delete data two\\n");
18             //如果操作2失败，则抛出异常
19         }
20 
21         if(!$db->commit()){
22             throw new Exception("failed to commit\\n");
23             //如果提交操作出错，则抛出异常
24         }
25         echo "success to delete two data\\n";
26     } catch (Exception $e){
27         $db->rollback();
28         echo $e->getMessage();
29         echo "haven‘t finish all works\\n";
30     }
31 
32     $db->close();
33 ?>