Question

I want to know that the admin trying to add a user to a collection actually have created that user.
Explanation of variables:

$userid = the userid to be added to a collection

$ownerid = the admins userid

$collectionid = the collectionid the user should be added to.

IF ($userid in (SELECT id FROM ‘users’ WHERE ‘owner’ = $ownerid)) THEN INSERT INTO ‘collectionusers’
(‘collectionid’, ‘userid’) VALUES ($collectionid, $userid);

If I execute this it looks like this

IF (8 in (SELECT id FROM ‘users’ WHERE owner = 1)) THEN INSERT INTO ‘collectionusers’
(‘collectionid’, ‘userid’) VALUES (3, 8);

I have looked on:

12.6.5.2. IF Syntax

11.3.2. Comparison Functions and Operators – IN()

I can’t figure out what’s wrong with this syntax.

Answer 1

You can do it using one query. For example:

INSERT INTO collectionusers(collectionid, userid)
  SELECT 3, 8 FROM users WHERE owner = 1 AND id = 8 LIMIT 1

Also, you can write a stored procedure.