How to CALL a PROCEDURE in MySQL?

https://stackoverflow.com/questions/21391811

03-10-2022
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Question

I've started to examine Procedures in MySQL, but all my efforts don't work. Here is my Procedure Creation:

DELIMITER //
CREATE PROCEDURE test(IN a INT)
BEGIN
    SELECT * 
    FROM `table`
    WHERE `id` = a;
END

MySQL returns O.K., no errors.

 DELIMITER ;

MySQL returns O.K., no errors.

But CALL-Statement does not work:

CALL test(8);

Returns an error: #1312 - PROCEDURE dbxyz.test can't return a result set in the given context

Now, I don't know what I've made wrong: a mistake in Procedure-Cration or an error in CALL-Statement.

--> ##########################

As of 6th Feb. 2014: Today, I've tried to find out, why my Stored Procedure does not work in Query Window of phpMyAdmin. A 'SELECT *' does not work within a Stored Procedure, but a SELECT column by column does work. Here is what I have found out: Use IN and OUT as well as INTO. Example:

 DELIMITER //
 CREATE PROCEDURE test(IN a INT, OUT b VARCHAR(12), OUT c INT)
 BEGIN
   SELECT b, c
   FROM `table`
   WHERE `id` = a
   INTO b, c;
 END

Now, this stored Procedure is able to run in phpMyAdmin:

 call test(5, @result1, @result2);
 SELECT @result1, @result2

If you just need ONE result instad of two or more, you could also use SET - Statement. Here we are:

   DELIMITER //
   CREATE PROCEDURE test(IN a INT, OUT b INT)
   BEGIN
        SET b = ( SELECT b
        FROM table
        WHERE id = a );
   END

Solution