Re: Does trigger only accept functions?

[veem v]

On Wed, 12 Jun 2024 at 00:26, hubert depesz lubaczewski <dep...@depesz.com>
wrote:

>
>
> No, I meant building dynamic queries and then EXECUTE-ing, like docs
> show:
>
> https://www.postgresql.org/docs/current/plpgsql-statements.html#PLPGSQL-STATEMENTS-EXECUTING-DYN
>
> Best regards,
>
> depesz
>
>
My apology, if interpreting it wrong way. It doesn't make much difference
though, but do you mean something like below?

CREATE OR REPLACE FUNCTION log_deletes()
RETURNS TRIGGER AS $$
DECLARE
    audit_table_name TEXT;
    audit_query TEXT;
BEGIN
    IF TG_TABLE_NAME = 'source_table1' THEN
        audit_table_name := 'delete_audit1';
        audit_query := 'INSERT INTO ' || audit_table_name || ' (record_id,
delete_timestamp, col1, col2, col3) VALUES ( $2, $3, $4)';
        EXECUTE audit_query USING OLD.id, OLD.col1, OLD.col2, OLD.col3;
    ELSIF TG_TABLE_NAME = 'source_table2' THEN
        audit_table_name := 'delete_audit2';
        audit_query := 'INSERT INTO ' || audit_table_name || ' ( col4,
col5, col6) VALUES ( $2, $3, $4)';
        EXECUTE audit_query USING OLD.id, OLD.col4, OLD.col5, OLD.col6;

    ELSE
        RAISE EXCEPTION 'Audit table not defined for %', TG_TABLE_NAME;
    END IF;

    RETURN OLD;
END;
$$ LANGUAGE plpgsql;