Checking the users is for meeting the requirement on MySQL

Question

I'm making an web with point and reward system where user collect points and if users point meet the requirement, user will get a reward and level up.

As example, here's my user table

id | username | level | point
1  | nameuser | 0     | 0

Award :

idaward | awardname | pointreq | badgeid
1       | LEVEL ONE | 10       | 1

and so on, I have 100+ award for user.

Award log

idlog | userid | awardid | badgeid | givendate

And my purpose is how to check if user is eligible or meet the requirement to get an award & badge ?

The flow:

Users have a point -> check if user meets the requirement to level up & get award 
-> Users will leveled up and get a reward (insert the info. to award log)
    If users already have it then ignore it.

I'm using Laravel, so if you can make the Laravel query, I will really appreciate it but I will also accept raw MySQL query.

Thank you

Answer 1

You can execute the following update query:

UPDATE user
SET level = level + 1
WHERE
id = ?
AND EXISTS (
    SELECT * FROM award WHERE pointreq <= user.point 
    AND awardid NOT IN (
        SELECT awardid from awardlog WHERE userid = user.id
    )
);

If the update returns 1 then you need to insert an entry into awardlog table, you can use following SELECT and INSERT queries for it:

SELECT * FROM award WHERE pointreq <= user.point 
AND awardid NOT IN (
   SELECT awardid from awardlog WHERE userid = user.id
);

You can get awardid and badgeid from above query and insert into awardlog.

Also, you need to make sure all 3 queries ( UPDATE , SELECT and INSERT ) get executed in a single transaction for consistency.