From: | Erwin Moller <erwin(at)darwine(dot)nl> |
---|---|
To: | |
Cc: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: Foreign Key 'walker'? |
Date: | 2008-11-18 16:34:06 |
Message-ID: | 4922EE7E.6060706@darwine.nl |
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Thread: | |
Lists: | pgsql-general |
Thomas Kellerer schreef:
> Erwin Moller, 18.11.2008 15:47:
>> Suppose I want to delete a record in tblnr1.
>> Does Postgres has some command/procedure/function to list tables that
>> have FK constraints on that table (tblnr1)
>
> That could be resolved with a query against the INFORMATION_SCHEMA
>
> Something like
>
> SELECT c.table_name || ' references ' || tu.table_name
> FROM information_schema.table_constraints c JOIN
> information_schema.constraint_table_usage tu ON
> (c.constraint_name = tu.constraint_name AND c.table_schema =
> tu.table_schema)
> WHERE c.constraint_type = 'FOREIGN KEY';
Hi Thomas,
Thanks!
That is not excactly what I need, but it gets very close. :-)
I think I can use that approach to build a (PHP)script to do the
recursive trick, so it lists all tables that are coupled via-via to the
first table.
Should be straightforward from here.
Thank you.
Regards,
Erwin Moller
>
>> and lists also the tables that have a FK constraint on tables that
>> have a FK constraint on the first? etc.
>> So I would like some kind of FK 'walker'.
>
> That would be your front-end that displays that (or some nested
> self-join using the above statement)
>
> Regards
> Thomas
>
>
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