具有多个条件的 MySQL If 语句？
借助AND或OR运算符，您可以在具有多个条件的存储过程中使用if语句。语法如下-
DECLARE X int; DECLARE Y int; SET X = value1; SET Y = value2; IF ( (X < Y AND X > value1 AND Y >value2) OR X! = anyValueToCompare) THEN yourStatement; ELSE yourStatement; END IF
现在为了理解上面的语法，让我们创建一个存储过程。创建存储过程的查询如下-
mysql> create procedure SP_IFELSEDEMO() -> BEGIN -> DECLARE X int; -> DECLARE Y int; -> SET X=100; -> SET Y=400; -> IF ( (X < Y AND X > 99 AND Y >300) OR X! = 10 ) THEN -> SELECT 'Logic is Correct'; -> ELSE -> SELECT 'Logic is not Correct'; -> END IF; -> END; -> // mysql> DELIMITER ;
现在在CALL命令的帮助下调用存储过程。查询如下-
mysql> call SP_IF ELSEDEMO();输出结果
+------------------+ | Logic is Correct | +------------------+ | Logic is Correct | +------------------+ 1 row in set (0.04 sec)