MySql Stored Procedure

Question

Hi, I am creating a stored procedure for Insert and Select data in MySql , my stored procedure is - 

DELIMITER $$

CREATE DEFINER=`root`@`localhost` PROCEDURE `new_procedure`(_action varchar(10) ,File varchar(100))

BEGIN

if _action = 'INSERT' then

insert into tab_file (File) values (File);

end if;

if _action = 'select' then

select ID,File from tab_file; 

end if;

END 

With this stored procedure i am able to insert data but select query is not working.It is giving error like "Expected 2,got 1"

Please help me how to write stored procedure in mysql forselect, insert, update and delete scripts?

Thanks