Re: Update of foreign key values

Roderick A. Anderson wrote:
> I have two tables in two databases (Pg 7.2.1 - yes I need to upgrade but
> there are several other dependencies I have to resolve first) and I need
> to update one database's tables so they can be merged into the other
> database's table.  I know I can drop the constraints and update the tables
> (primary key, and foreign key) but was hoping I'd not have to do that.
>    An attempt at using the techniques in Joel Burton's "Referential
> Integrity Tutorial & Hacking the Referential Integrity tables" was
> unsuccessful.
>
> Is there a method I can use to add 1000 to all the primary and foreign
> keys in one pass?  Searches using Google and the PostgreSQL docs turned up
> nothing useful to my situation.  I see if the table/constraint would have
> been created differently the updates would have cascaded but that did
> not happen.

Strikes me as a perfect example for having the constraint defined "ON
UPDATE CASCADE". Or making it "DEFERRABLE" and do both changes in a
transaction after setting the constraint deferred.


Jan

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