On Wednesday 05 December 2001 06:47, kiyo taka wrote:
> hi all.
>
> i'd like to noe how to create trigger which will insert tablez old data
> into an archive table before any(insert,update,delete) operation is
> executed.
>
> i've tried "if inserting ...." but it didnt work.
> is there any function that will do it?
Assuming an example table thus: CREATE TABLE mytable(id INTEGER, whatever VARCHAR(16));
and an identical archive table: CREATE TABLE mytable_archive(id INTEGER, whatever VARCHAR(16));
you can create the following function and trigger for that
table:
DROP FUNCTION mytable_archive_proc();
CREATE FUNCTION mytable_archive_proc() RETURNS opaque AS ' BEGIN IF TG_OP = ''DELETE'' THEN INSERT INTO
mytable_archiveVALUES(old.id, old.whatever); RETURN old; ELSE INSERT INTO mytable_archive
VALUES(new.id,new.whatever); END IF; RETURN new; END;' LANGUAGE 'plpgsql';
DROP TRIGGER mytable_archive_trigger ON mytable;
CREATE TRIGGER mytable_archive_trigger BEFORE INSERT OR UPDATE OR DELETE ON mytable FOR EACH ROW EXECUTE PROCEDURE
mytable_archive_proc();
Which should write all changes in "mytable" to "mytable_archive".
> any help will be greatly appreciated.
>
> thanx.
Dou itashimashite
Ian Barwick
