LAST_INSERT_ID() MySQL

问题描述

我有一个 MySQL 问题，我认为它一定很简单.当我运行以下 MySql 查询时，我需要从 table1 返回 LAST INSERTED ID:

I have a MySQL question that I think must be quite easy. I need to return the LAST INSERTED ID from table1 when I run the following MySql query:

INSERT INTO table1 (title,userid) VALUES ('test',1); 
INSERT INTO table2 (parentid,otherid,userid) VALUES (LAST_INSERT_ID(),4,1);
SELECT LAST_INSERT_ID();

如您所知，当前代码只会返回 table2 的 LAST INSERT ID 而不是 table1，即使我插入 table2 之间，我如何从 table1 获取 ID?

As you can understand the current code will just return the LAST INSERT ID of table2 instead of table1, how can I get the id from table1 even if I insert into table2 between?

推荐答案

您可以将最后一个插入 id 存储在一个变量中:

You could store the last insert id in a variable :

INSERT INTO table1 (title,userid) VALUES ('test', 1); 
SET @last_id_in_table1 = LAST_INSERT_ID();
INSERT INTO table2 (parentid,otherid,userid) VALUES (@last_id_in_table1, 4, 1);    

或者从 table1 中获取最大 id(警告.请参阅 Rob Starling 评论中的注释，关于使用最大 id 时竞争条件可能导致的错误)

Or get the max id from table1 ( Warning. See note in comments from Rob Starling about possible errors from race conditions when using the max id)

INSERT INTO table1 (title,userid) VALUES ('test', 1); 
INSERT INTO table2 (parentid,otherid,userid) VALUES (LAST_INSERT_ID(), 4, 1); 
SELECT MAX(id) FROM table1;  

(警告:正如 Rob Starling 在

(Warning: as Rob Starling points out in the

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