Question

I don’t know if this post is duplicate.I found some php file which consist of JQuery DataTable and was made by someone(I don’t know where the developer lies).

Clientside

Serverside

This query’s function is to show data inside Database, The query like:

case 'average' :
                $needfieldname=false;
                $month=getVar('calcmonth');
                $sql="SELECT SQL_CALC_FOUND_ROWS ID,name,remark,avrusepmonth 
                , CONCAT('<input type=''checkbox''id=''cb' , ID ,''' name=''check[]'' value=''',ID,''' >'
                ,'<label class=''lbcb'' for=''cb', ID,'''><=update=</label>') as checkb 
                , moq, leadtime 
                FROM test_media ";
                break;

what I want to ask here is this part :

monthavrage(ID,".$month.") as latestavr

what kind of Mysql function at query above? cause I got an error like:

FUNCTION TestMediaControl.monthavrage does not exist

Answer 1

i have found a SQL file which declare of monthavrage function.
I’m just need to execute this file, so my problem is disappear.

USE testmediacontrol;

DROP FUNCTION IF EXISTS  monthavrage;


delimiter //

CREATE FUNCTION monthavrage (mediaID MEDIUMINT ,amonth DECIMAL(2)) RETURNS DECIMAL(6,2)
BEGIN
        DECLARE avguse DECIMAL(6,2);
        DECLARE howlongmonth DECIMAL(2);

        SELECT DATEDIFF(NOW(),startuse)/30.4 
            INTO howlongmonth from media_use 
            WHERE media_ID=mediaID
            ORDER BY startuse 
            LIMIT 0,1;
        IF howlongmonth < amonth THEN
            SET amonth=howlongmonth;
        END IF;
        IF amonth <= 0 THEN
            RETURN 0;
        END IF;
        SELECT count(*)/amonth 
            INTO avguse from media_use 
            WHERE media_ID=mediaID and startuse  BETWEEN SUBDATE(now(),INTERVAL 6 MONTH) and  now();
        RETURN avguse;
END