我有以下存储过程:
CREATE PROCEDURE getLastValueAutomaticShelter(IN fieldName varchar(30), position_number INT)
BEGIN
SET @query = CONCAT('SELECT * FROM automatic_changes WHERE',fieldName,'IS NOT NULL AND P_id=?');
PREPARE stmt FROM @query;
SET @position_number=position_number;
EXECUTE stmt USING @position_number;
DEALLOCATE PREPARE stmt;
END
然后我正在运行它:
mysql> call getLastValueAutomaticShelter('current_level', 500)//
收到以下错误:
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that
corresponds to your MySQL server version for the right syntax to use near 'NOT N
ULL AND P_id=?' at line 1
有什么想法吗?感谢。
答案 0 :(得分:2)
你需要在那里添加一些空格:
SET @query = CONCAT('SELECT * FROM automatic_changes WHERE ',fieldName,' IS NOT NULL AND P_id=?');
/* right ^ here....and ^ here*/
否则您的最终查询可能如下所示:
SELECT * FROM automatic_changes WHEREcolumnameIS NOT NULL AND P_id='whatever';
你明白了这一点:)