dsy19811981
dsy19811981
2019-06-21 09:13

在插入mysql数据库时获取上次插入ID的最可靠方法是什么

已采纳

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 ?

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  • dptpn06684 dptpn06684 2年前

    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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