passing LIMIT as parameters to MySQL sproc

Question

I'm creating a paging class and need to pass in two parameters to my MySQL stored procedure for the LIMIT clause.

I'm passing them in as INTs and trying something like this

SELECT *
FROM
`MyTable`
LIMIT
MyFirstParamInt, MySecondParamInt

it gives me an error when I try and save the sproc though. Is there a way to do this that I'm just missing? Or am I going to have to EVAL the whole query and EXECUTE it?

Answer 1

Best pagination example may help you

call user_list(v_private_key,v_user_id,v_pageIndex,v_limit,v_image_path, @o_rec_count, @o_error_code, @o_error_message)

DECLARE v_QueryLimit TEXT DEFAULT "";
DECLARE v_Select TEXT DEFAULT "";
DECLARE v_where TEXT DEFAULT '';
DECLARE v_From TEXT DEFAULT "";
DECLARE v_group_by TEXT DEFAULT " ";
DECLARE v_having TEXT DEFAULT "";
DECLARE v_OrderBy TEXT DEFAULT "";


SET o_error_code = '200';

SET v_Select = CONCAT(" SELECT
        AES_DECRYPT(email,'",v_private_key,"') AS email,
        AES_DECRYPT(first_name,'",v_private_key,"') AS first_name,
        AES_DECRYPT(last_name,'",v_private_key,"') AS last_name,
        AES_DECRYPT(mobile_no,'",v_private_key,"') AS mobile_no,
        CONCAT(AES_DECRYPT(first_name,'",v_private_key,"'),' ', AES_DECRYPT(last_name,'",v_private_key,"')) as full_name,
        CONCAT('",v_image_path,"','profile/',IFNULL(thumb,'user_thumb.png')) AS thumb,
        CONCAT('",v_image_path,"','profile/small/',IFNULL(thumb,'user_thumb.png')) AS thumb_small,
        IFNULL(country_code,'+91') as  country_code,
        IFNULL(unique_code,'') as user_code
    ");


SET v_From = CONCAT(" FROM userinfo WHERE role_group = 2  AND  id != ",v_user_id," ");

IF (v_PageIndex) > 0 THEN
    SET v_QueryLimit = CONCAT(" LIMIT ", v_limit, "," , v_pageIndex);
END IF;

-- set v_group_by = concat(' GROUP BY  ut.user_card_id,  ');        

SET @rec_Query= CONCAT(v_Select
            ,v_From
            ,v_Where
            ,v_group_by
            ,v_having
            ,v_OrderBy);

/**************** Get Record Count **************/
SET @cnt_Query = CONCAT("Select Count(*) INTO @o_rec_count FROM (",@rec_Query,") AS tmp");
PREPARE c2 FROM @cnt_Query;
EXECUTE c2;

SET o_rec_count=@o_rec_count;   

/**************** Calculate Limit **************/
IF (v_limit != "" && v_pageIndex != "")  AND @o_rec_count>0 THEN 
    CALL Calculate_Paging_Index(@o_rec_count ,v_limit,v_pageIndex,@new_start_limit);        
    SET v_QueryLimit = CONCAT(" LIMIT ",@new_start_limit, ",",v_limit);
END IF;

SET @vv2_Query= CONCAT(v_Select
            ,v_From
            ,v_Where
            ,v_group_by
            ,v_having
            ,v_OrderBy
            ,v_QueryLimit); 

PREPARE s2 FROM @vv2_Query;
EXECUTE s2;

SET o_error_message = "success";

calculate page index SP

CREATE PROCEDURE calculate_paging_index(in_count,in_limit,in_page,@out_start_limit)enter code here`

DECLARE count1 INT;
DECLARE total_pages INT;

SET count1  = in_count;
IF( count1 > 0 ) THEN 
    SET total_pages = CEIL(count1/in_limit);
ELSE 
    SET total_pages = 0;
END IF;

IF (in_page > total_pages) THEN 
SET in_page=total_pages;

END IF;
SET out_start_limit = in_limit * in_page - in_limit;