I write a store procedure.But it don't take the table name as a parameter.Now how i send a table name as aparameter.Pls see my proc below:
DELIMITER $$
USE `db_test`$$
DROP PROCEDURE IF EXISTS `test_proc`$$
CREATE DEFINER=`root`@`localhost` PROCEDURE `test_proc`(IN newsInfoTable VARCHAR(100))
BEGIN 开发者_如何学JAVA
SELECT news INTO @news
FROM newsInfoTable
WHERE CURDATE()=DATE_FORMAT(date_time,'%Y-%m-%d')
ORDER BY date_time DESC LIMIT 1;
SELECT @news;
END$$
DELIMITER ;
Calling parameter:
USE db_test;
CALL test_proc('tbl_news_list');
But the ERROR is: Table 'db_test.newsinfotable' doesn't exist
How solve this problem.Pls help.
Use prepared statements in your procedure body:
SET @s = CONCAT('SELECT ... FROM ', newsInfoTable);
PREPARE stmt FROM @s;
EXECUTE stmt;
//.....
DEALLOCATE PREPARE stmt;
Your code should look like :
SET @sql_stam = CONCAT('SELECT news INTO @news FROM ',newsInfoTable,
' WHERE DATE_FORMAT(date_time,\'%Y-%m-%d\')
ORDER BY date_time DESC LIMIT 1');
...
SELECT @news;
Also, I don't see any reasons you need to use @news
variable...
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