相当于 mySQL 中的 SQLServer 函数 SCOPE_IDENTITY()?

问题描述

mySQL 中 SQLServer 函数 SCOPE_IDENTITY() 的等价物是什么?

What is the equivalent of SQLServer function SCOPE_IDENTITY() in mySQL?

推荐答案

这是您要找的:

LAST_INSERT_ID()

为了回应 OP 的评论，我创建了以下基准测试:

In response to the OP's comment, I created the following bench test:

CREATE TABLE Foo
(
    FooId INT AUTO_INCREMENT PRIMARY KEY
);

CREATE TABLE Bar
(
    BarId INT AUTO_INCREMENT PRIMARY KEY
);

INSERT INTO Bar () VALUES ();
INSERT INTO Bar () VALUES ();
INSERT INTO Bar () VALUES ();
INSERT INTO Bar () VALUES ();
INSERT INTO Bar () VALUES ();

CREATE TRIGGER FooTrigger AFTER INSERT ON Foo
    FOR EACH ROW BEGIN
        INSERT INTO Bar () VALUES ();
    END;

INSERT INTO Foo () VALUES (); SELECT LAST_INSERT_ID();

返回:

+------------------+
| LAST_INSERT_ID() |
+------------------+
|                1 |
+------------------+

所以它使用原始表的 LAST_INSERT_ID() 而不是 INSERT 插入触发器内部的表.

So it uses the LAST_INSERT_ID() of the original table and not the table INSERTed into inside the trigger.

我意识到我的答案中显示的 SELECT LAST_INSERT_ID() 的结果是错误的，尽管最后的结论是正确的.我已将结果更新为正确的值.

I realized after all this time that the result of the SELECT LAST_INSERT_ID() shown in my answer was wrong, although the conclusion at the end was correct. I've updated the result to be the correct value.

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