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                            # Coroutine\\MySQL->begin
[TOC]
開啟事務。函數原型：

~~~
function Coroutine\MySQL->begin->begin() | bool;

~~~

*   啟動一個`MySQL`事務，成功返回`true`，失敗返回`false`，請檢查`$db->errno`獲取錯誤原因
*   與`commit`和`rollback`結合實現`MySQL`事務處理
*   同一個`MySQL`連接對象，同一時間只能啟動一個事務
*   必須等到上一個事務`commit`或`rollback`才能繼續啟動新事務
*   否則底層會拋出`Swoole\MySQL\Exception`異常，異常`code`為`21`

## 使用實例

~~~
$db->begin();
$db->query("update userinfo set level = 22 where id = 1");
$db->commit();
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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