dsy19811981
2019-06-21 09:13
浏览 344
已采纳

在插入mysql数据库时获取上次插入ID的最可靠方法是什么

I have found two way to get the last insert id

Result, err := s.DB.ExecContext(ctx, query, qp)
if err != nil {
    return 0, err
}
ID, err := Result.LastInsertId()

and another way is to use mysql's 

select LAST_INSERT_ID();

How different are these two methods and what should i do in-case the first method throws an error, would it mean my insert failed or would it mean just that method failed to return the id ?

图片转代码服务由CSDN问答提供 功能建议

我发现了两种获取最后一个插入ID的方法 

 结果，错误：= s.DB.ExecContext（ctx，query，qp）
if错误！= nil {
返回0，错误
} 
ID，错误：= Result.LastInsertId（）
   
 
 
，另一种方法是使用mysql的 
 
 
  select LAST_INSERT_ID（）; 
   
  
 
这两个方法有何不同？万一第一个方法抛出错误，我该怎么办？这是否意味着我的插入操作失败了，还是意味着该方法无法返回ID？
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1条回答 默认 最新

  • dptpn06684 2019-06-21 09:18
    已采纳

    Use Result.LastInsertId(). This is always reliable.

    Doing your own SELECT is not reliable, due to the way the Go driver handles pools of connection. If you do, say:

    INSERT foo INTO bar ...

    in one statement, then later:

    SELECT LAST_INSERT_ID();

    in another statement, you may get different connections to the database for each statement.

    This means your manually-selected ID may correspond with some completely unrelated INSERT statement which just happened to occur on that same connection in the past, or you may get nothing at all.

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