From: Robert Wimmer <seppwimmer@hotmail.com>
To: pgsql-interfaces@postgresql.org
Subject: check foreign constraints before delete
Date: Wed, 21 Sep 2005 23:43:23 +0000
Message-ID: <BAY109-F12955AB36E2BB06F87D1D5D0940@phx.gbl> (raw)
hi,
i want to write a function in plpgsql, which checks a foreign key constraint
violation on deleting a special value in my table. for example
CREATE TABLE to (n NAME PRIMARY KEY);
CREATE TABLE t1 (n_name NAME REFERENCES to(n), id INTEGER ...);
CREATE FUNCTION check_before_delete(..some value ...) RETURNS INTEGER AS '
..
IF foreign_key_violation THEN RETURN -1 END IF;
RETURN 0;
..
END;
...
so i can avoid the database errormessages.
i checked some 'd' commands with the 'E' option. but i have no idea for a
smart solution of this problem
thanx in advance (tom?)
sepp
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To: pgsql-interfaces@postgresql.org
Cc: seppwimmer@hotmail.com
Subject: Re: check foreign constraints before delete
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