How to fetch last select statements result set? - mysql

Question

I have a stored procedure that looks like below Pseudo:
create procedure composite(IN a varchar(255),IN b varchar(255),IN c datetime,IN d datetime)
begin
DECLARE str VARCHAR(255);
DECLARE count float;
SET str = '';
SET str = CONCAT("aname like '%",a,"%' "," and bname ='",b,"' ");
set #comp = CONCAT("SELECT * from abc where ",str, "GROUP BY qname");
PREPARE stmt FROM #comp;
EXECUTE stmt;
set count = found_rows();
SET STR1 = CONCAT("aname like '%",a,"%' "," and bname ='",b,"' ");
SET #sql = CONCAT("SELECT * from xyz",str,"GROUP BY DATE(FROM_UNIXTIME(abcdate)),qname");
PREPARE stmt FROM #sql;
EXECUTE stmt;
end//
When I execute this i get 2 result-sets as output i.e. from executing 2 select statement. I want the output of only last select. Is there any way to do this?

Answer 1

Do not quite understand what you want to do. I imagine that the stored procedure is not complete.
Is it really necessary to use prepared statements in this case? Do you need to count as float?
Maybe something like this might be useful:
...
DECLARE count BIGINT UNSIGNED;
SELECT COUNT(*) INTO count /* Here you can use a user variable (#count) and avoiding the local variable (count) */
FROM (
SELECT 0
FROM abc
WHERE aname LIKE CONCAT('%', a, '%') AND bname = b
GROUP BY qname
) der;
SELECT aname, bname, qname
FROM xyz
WHERE aname LIKE CONCAT('%', a, '%') AND bname = b
GROUP BY qname;
...
The first statement will store the number of rows in the local variable count and will not return the dataset. Beware of variable names and reserved words, in this case count is allowed, but read 9.3. Reserved Words in the documentation.