Re: Writing my first trigger

Am 19.05.22 um 20:18 schrieb Chris Tsongas:
> Working on my first trigger to create a fullName value from firstName,
> optional preferredFirstName, and lastName fields, where the full name
> uses the optional preferred first name if it exists, otherwise it uses
> the first name and of course the required last name.
>
> Would be great to get feedback on the following code before I try
> running it (note I already have an employee table, just including the
> CREATE TABLE statement for clarity):
>
> CREATE TABLE employee (
> firstName text NOT NULL,
> preferredFirstName text,
> lastName text NOT NULL,
> fullName text,
> );
>
> CREATE OR REPLACE FUNCTION update_employee() RETURNS TRIGGER AS $$
> BEGIN
> IF (OLD."preferredFirstName" IS NOT NULL) THEN
> NEW."fullName" = OLD."preferredFirstName" || ' ' || OLD."lastName";
> ELSE
> NEW."fullName" = OLD."firstName" || ' ' || OLD."lastName";
> END IF;
> NEW."updatedAt" = now();
> RETURN NEW;
> END;
> $$ LANGUAGE plpgsql;
>
> CREATE TRIGGER fullName
> INSTEAD OF INSERT OR UPDATE ON employee
> FOR EACH ROW EXECUTE FUNCTION update_employee();
>

your table doesn't contain the field "updatedA". I would suggest to
calculate the fullName at select-time and not via TRIGGER.

Andreas

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