定义函数

CREATE DEFINER=`root`@`localhost` FUNCTION `test_fun1`(num1 FLOAT,num2 FLOAT) RETURNS float
BEGIN
	DECLARE SUM FLOAT DEFAULT 0;
	SET SUM=num1+num2;
	RETURN SUM;
END

<select id="cunchu" resultType="java.util.Map">
    SELECT test_fun1(1,2) as result
</select>