Question

I’m trying to create a trigger in phpMyadmin (MySQL)

I have two tables, members and subscriptions. subscriptions has a date field (the date when the subscription expires) and so does members. The two tables have a common member.ID field.

When a new subscription record is inserted, I want to update the expiry date field in the members table.

The trigger setup is on table subscriptions, update after insert

This what I have entered into the create trigger dialouge in phpmyadmin:

UPDATE members
SET members.mbrshp_expiry_date = subscriptions.expiry_date
WHERE  members.mbrshp_number = subscriptions.mbrshp_number

When this code triggers it comes back with an error. The two subscription fields referenced in the clause are not found.

Any help would be greatly appreciated.

Answer 1

Fields can be referenced in a trigger by using the NEW prefix.

UPDATE members 
SET members.mbrshp_expiry_date = NEW.expiry_date 
WHERE members.mbrshp_number = NEW.mbrshp_number

This functions correctly 🙂