From: Ray Madigan <ray@madigans.org>
To: Pgsql-Sql <pgsql-sql@postgresql.org>
Subject: Rules with sequence columns
Date: Wed, 28 Mar 2007 08:25:17 -0800
Message-ID: <460A96ED.9000001@madigans.org> (raw)
I have the following situation that I would appreciate your input on:
I have a table with a column that I use to uniquely identify its rows.
The table also has a rule on insert that stores the row identifier into
another table for reference at some other point.
The table is defined as
CREATE SEQUENCE foo_seq;
CREATE TABLE foo ( fooK INTEGER DEFAULT NEXTVAL ( 'foo_seq' ),
fooN VARCHAR(32) NOT NULL UNIQUE,
link INTEGER NOT NULL
DEFAULT 0 );
The rule does an insert into another table and I have implemented the
rule in two ways.
CREATE RULE insertCD AS ON INSERT TO foo
DO INSERT INTO cdFoo ( contextK, componentK )
SELECT currval ( 'foo_seq' ), componentK
FROM Component
WHERE componentN = 'Division';
or
CREATE RULE insertCD AS ON INSERT TO foo
DO INSERT INTO cdFoo ( contextK, componentK )
SELECT new.fooK, componentK
FROM Component
WHERE componentN = 'Division';
The situation is that every time the rule fires, the foo sequence is
incremented
for each row in the foo table. and the reference value is not the same
in the table.
I have tried to take the default nextval ( 'foo_seq' ) from the row
initialization and move it to the insert
insert into foo ( fook, fooN ) values ( nextval ( 'foo_seq' ), 'Name' );
with the same result.
The only way I have been able to make it work is ugly.
int fooK = select nextval ( 'foo_seq' );
insert into foo ( fooK, fooN ) values ( fooK, 'Name' );
Does anyone have any suggestion?
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To: pgsql-sql@postgresql.org
Cc: ray@madigans.org
Subject: Re: Rules with sequence columns
In-Reply-To: <460A96ED.9000001@madigans.org>
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