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* Parent table has not oid?
@ 2002-11-10 06:04 Zhidian Du <duzhidian@hotmail.com>
0 siblings, 1 reply; 3+ messages in thread
From: Zhidian Du @ 2002-11-10 06:04 UTC (permalink / raw)
To: pgsql-php@postgresql.org; pgsql-sql; sszabo@megazone23.bigpanda.com
Dear All:
Please disregerd my last email.
I want to create a delete cascade in children tables. The primary key of
parent table is oid.
CREATE TABLE Link (
Protein_ID oid
CONSTRAINT one
REFERENCES Protein (oid)
ON DELETE CASCADE,
Link varchar(128)
);
Create child table is ok.
When I insert a record into this child table, it says
"ERROR: constraint one: table protein does not have an attribute oid"
Why?
Thanks.
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^ permalink raw reply [nested|flat] 3+ messages in thread
* Re: [SQL] Parent table has not oid?
@ 2002-11-10 13:50 Tom Lane <tgl@sss.pgh.pa.us>
parent: Zhidian Du <duzhidian@hotmail.com>
0 siblings, 1 reply; 3+ messages in thread
From: Tom Lane @ 2002-11-10 13:50 UTC (permalink / raw)
To: Zhidian Du <duzhidian@hotmail.com>; +Cc: pgsql-php@postgresql.org; pgsql-sql; sszabo@megazone23.bigpanda.com
"Zhidian Du" <duzhidian@hotmail.com> writes:
> CREATE TABLE Link (
> Protein_ID oid
> CONSTRAINT one
> REFERENCES Protein (oid)
> ON DELETE CASCADE,
> Link varchar(128)
> );
> When I insert a record into this child table, it says
> "ERROR: constraint one: table protein does not have an attribute oid"
How old is your Postgres?
IIRC, this was made to work in 7.2 or thereabouts.
Note that using OID as a foreign key is not really a good idea, because
it's problematic to dump and restore. You'd be better off with a serial
column as primary key.
regards, tom lane
^ permalink raw reply [nested|flat] 3+ messages in thread
* Re: [SQL] Parent table has not oid?
@ 2002-11-12 17:12 scott.marlowe <scott.marlowe@ihs.com>
parent: Tom Lane <tgl@sss.pgh.pa.us>
0 siblings, 0 replies; 3+ messages in thread
From: scott.marlowe @ 2002-11-12 17:12 UTC (permalink / raw)
To: Zhidian Du <duzhidian@hotmail.com>; +Cc: pgsql-php@postgresql.org; pgsql-sql
On Sun, 10 Nov 2002, Tom Lane wrote:
> "Zhidian Du" <duzhidian@hotmail.com> writes:
> > CREATE TABLE Link (
> > Protein_ID oid
> > CONSTRAINT one
> > REFERENCES Protein (oid)
> > ON DELETE CASCADE,
> > Link varchar(128)
> > );
> > When I insert a record into this child table, it says
> > "ERROR: constraint one: table protein does not have an attribute oid"
>
> How old is your Postgres?
>
> IIRC, this was made to work in 7.2 or thereabouts.
>
> Note that using OID as a foreign key is not really a good idea, because
> it's problematic to dump and restore. You'd be better off with a serial
> column as primary key.
Yeah, I found that out the hardway and spent a couple days rewriting an
app that had used OIDs in a way it really shouldn't have.
The only time I use OIDs now is to get rid of duplicate rows by hand or
such like that.
^ permalink raw reply [nested|flat] 3+ messages in thread
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-- links below jump to the message on this page --
2002-11-10 06:04 Parent table has not oid? Zhidian Du <duzhidian@hotmail.com>
2002-11-10 13:50 ` Tom Lane <tgl@sss.pgh.pa.us>
2002-11-12 17:12 ` scott.marlowe <scott.marlowe@ihs.com>
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