How to use Table output from stored MYSQL Procedure

Question

I\'ve been looking for the last hour or so and haven\'t found a conclusive answer to this seemingly simple problem:

How do you call a stored MYSQL function/p

Answer 1

Even better solution is to create the temporary table outside of the stored procedure, and have the procedure just update/insert to it. This way results of multiple calls can be stored in one table (as long as there are the same columns inserted), and retrieved in the end with a simple SELECT.

Here is an example using the same data as #sinecospi above:

/* The data */
drop table if exists someData ;
create table someData (itemId int, itemName varchar(20), itemQty int, itemCat int) ;
insert into someData values
(1,'First', 9, 1)
,(2,'Second',50, 3)
,(3,'Third', 12, 5)
,(4,'Fourth', 7, 3)
,(5,'Fifth', 1, 2)
,(6,'Sixth', 1, 1)
,(7,'Seventh', 9, 3)
,(8,'Eighth', 0, 2);

/* The stored procedure */
DROP PROCEDURE IF EXISTS sproc;

DELIMITER //

CREATE PROCEDURE sproc(
  IN fld CHAR(64),
  IN tbl CHAR(64)
)

BEGIN
  SET @s = CONCAT('INSERT INTO results
    SELECT \'',fld,'\' AS fld, x.* FROM (
      SELECT ',fld,' AS bin, COUNT(',fld,') AS ct 
          FROM ',tbl,' 
          GROUP BY bin 
          ORDER BY bin) x;');
  PREPARE stmt FROM @s;
  EXECUTE stmt;
  DEALLOCATE PREPARE stmt;
  
END //

DELIMITER ;

/* Calls */

CREATE TEMPORARY TABLE IF NOT EXISTS results (
  fld VARCHAR(30), bin VARCHAR(30), ct FLOAT);


CALL sproc('itemQty','someData');
CALL sproc('itemCat','someData');

SELECT * FROM results;

In the end, the temporary table results has the output of 2 calls.