mysql - 如何在MySql存储过程中同时使用Count和Like子句？

Question

我使用了下面的存储过程来动态获取表名并获取搜索关键字。

 DELIMITER $$
CREATE DEFINER=`root`@`localhost` PROCEDURE `GetTableLength`(IN TABLE_NAME VARCHAR(100),
                                                                           IN SEARCH VARCHAR(150)) BEGIN IF (SEARCH = '') THEN
SET @query = CONCAT('select count(*) as total from ',TABLE_NAME); ELSE
SET @query = CONCAT('select count(userId) as total from ',TABLE_NAME, ' WHERE userName like ', SEARCH); END IF; PREPARE stmt3
FROM @query; EXECUTE stm3; END

当我调用上面的程序时，如下所示。

   CALL GetTableLength('usertbl', 'kisan')

这里，kisan 是搜索关键字。

然后出现以下错误。怎么了？

错误代码:1054。“where 子句”中存在未知列“kisan”

Answer 1

尝试像下面这样使用:

set @query = CONCAT("select count(userId) as total from ",table_name, " WHERE userName like '", search,"'");

即使你也可以尝试:

set @query = CONCAT("select count(userId) as total from ",table_name, " WHERE userName like '%", search,"%'");