编写mysql函数但失败了

Question

尝试在mysql中编写此函数，但它给出的错误是：

Error Code : 1064 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 'IF Per='hour' THEN SET t=Price ; END IF; IF Per='day' THEN SET t=Price/24; END ' at line 8

DELIMITER$$
CREATE  FUNCTION PricePerHour (Price REAL, Per VARCHAR(5))  
RETURNS REAL 
DETERMINISTIC

BEGIN 
DECLARE t REAL;
IF Price IS NOT NULL AND Per IS NOT NULL

IF Per='hour' THEN SET t=Price ; END IF;
IF Per='day' THEN SET t=Price/24; END IF;
IF Per='week' THEN SET t=Price/7/24; END IF;
IF Per='month' THEN SET t=Price/30/24; END IF;
IF Per='year' THEN SET t=Price/365/30/24; END IF;

RETURN t;
END IF;
END $$
DELIMITER;

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Answer 1

缺少那个？

DELIMITER$$
CREATE  FUNCTION PricePerHour (Price REAL, Per VARCHAR(5))  
RETURNS REAL 
DETERMINISTIC

BEGIN 
DECLARE t REAL;
IF Price IS NOT NULL AND Per IS NOT NULL   **THEN**

IF Per='hour' THEN SET t=Price ; END IF;
IF Per='day' THEN SET t=Price/24; END IF;
IF Per='week' THEN SET t=Price/7/24; END IF;
IF Per='month' THEN SET t=Price/30/24; END IF;
IF Per='year' THEN SET t=Price/365/30/24; END IF;

RETURN t;
END IF;
END $$
DELIMITER;