您可以在 AND 或 OR 运算符的帮助下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; -> // Query OK, 0 rows affected (0.27 sec) mysql> DELIMITER ;
现在借助 CALL 命令调用存储过程。查询如下 -
mysql> call SP_IF ELSEDEMO();
输出
+------------------+ | Logic is Correct | +------------------+ | Logic is Correct | +------------------+ 1 row in set (0.04 sec) Query OK, 0 rows affected (0.07 sec)
