Re: Getting the OID of inserted row in a rule
От | Michael Fuhr |
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Тема | Re: Getting the OID of inserted row in a rule |
Дата | |
Msg-id | 20040922152643.GA92429@winnie.fuhr.org обсуждение исходный текст |
Ответ на | Getting the OID of inserted row in a rule (Bradley Kieser <brad@kieser.net>) |
Ответы |
Re: Getting the OID of inserted row in a rule
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Список | pgsql-admin |
On Wed, Sep 22, 2004 at 02:21:42PM +0100, Bradley Kieser wrote: > I have a rule on a view that needs to insert into two tables. The one > table has a serial ID as its unique key. The second table links to the > first one in one of its columns. > > I would prefer to keep this as a rule-based solution and not have to > write a function as I hope to relicate the solution across many views. > > I need to either be able to select nextval() the ID for the first table > and somehow store this in the rule (but I don't see that rules support > variables) or I need to somehow obtain the OID from the first insert in > order to select back the ID that was assigned during the insert and pass > it to the second insert (trivial to do as the second insert is then > simply a select-based insert, provided that I know the OID of that first > row!). The second insert should be able to use currval() to get the current value of the sequence used in the first insert. Here's an example: CREATE RULE v_ins AS ON INSERT TO v DO INSTEAD ( INSERT INTO a (xxx) VALUES (NEW.xxx); INSERT INTO b (col1, col2, col3) VALUES (NEW.col1, NEW.col2, currval('a_id_seq')) ); -- Michael Fuhr http://www.fuhr.org/~mfuhr/
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