存储过程中的mysql动态查询 [英] mysql dynamic query in stored procedure

问题描述

我正在存储过程中创建动态查询.我的存储过程如下:

i am creating a dynamic query in stored procedure. my stored procedure is as follows:

CREATE PROCEDURE `test1`(IN tab_name VARCHAR(40),IN w_team VARCHAR(40))
BEGIN
SET @t1 =CONCAT("SELECT * FROM ",tab_name," where team=",w_team);
 PREPARE stmt3 FROM @t1;
 EXECUTE stmt3;
 DEALLOCATE PREPARE stmt3;
END

当我尝试通过以下调用运行它时:

when i try to run it with the following call:

call test1 ('Test','SPA');

我收到以下错误消息:

错误代码:1054."where子句"中的未知列"SPA"

Error Code: 1054. Unknown column 'SPA' in 'where clause'

我在没有where条件的情况下进行了测试，它可以正常工作，但是在where条件不起作用的情况下，我尝试将@与变量名一起使用，但仍然无法正常工作.

i tested without where condition and it works fine, but with the where condition its not working, i tried using @ with the variable name but it still does not work.

感谢您的帮助.

推荐答案

您错过了WHERE子句中的引号.

You missed the quotes in WHERE clause.

尝试这样:

SET @t1 =CONCAT("SELECT * FROM ",tab_name," where team='",w_team,"'");

说明:

从您的代码中查询将是:

Query from your code would be like:

SELECT * FROM Test where team=SPA

我们将其更改为:

SELECT * FROM Test where team='SPA'

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