Hello,
Sorry, I forgot the trigger:
-- public stuff
SET search_path = public, pg_catalog;
CREATE TABLE customer(
customer_id SERIAL,
customer_notification INTEGER,
CONSTRAINT customer_notification CHECK ((((notification = 0) OR
(notification = 1)) OR (notification = 2))),
);
CREATE TRIGGER del_customer
AFTER DELETE ON customer
FOR EACH ROW
EXECUTE PROCEDURE del_customer();
- Greg
>Hello,
>
>I have a question about inherited tables w/r to triggers... Hopefully
>this will make some sense... (I'll try to keep the schema example as
>simple as possible):
>
>
>Given the follow schema/tables:
>
>-- public stuff
>SET search_path = public, pg_catalog;
>CREATE TABLE customer(
> customer_id SERIAL,
> customer_notification INTEGER,
> CONSTRAINT customer_notification CHECK ((((notification = 0) OR
>(notification = 1)) OR (notification = 2))),
>
>);
>CREATE TABLE shipto (
> trans_id INTEGER
>);
>
>
>CREATE FUNCTION del_customer() RETURNS "trigger"
> AS '
>begin
> delete from shipto where trans_id = old.id;
> return NULL;
>end;
>'
> LANGUAGE plpgsql;
>
>
>
>-- test schema
>CREATE SCHEMA test;
>SET search_path = test, pg_catalog;
>CREATE TABLE customer () INHERITS (public.customer);
>CREATE TABLE proposals (
> proposal_id PRIMARY KEY,
> user_id INTEGER REFERENCES customer(name)
>);
>-- test2 schema
>CREATE SCHEMA test2;
>SET search_path = test2, pg_catalog;
>CREATE TABLE customer () INHERITS (test.customer);
>CREATE TABLE proposals () INHERITS (test.proposals);
>
>
>Here are some questions:
>
>#1. With regards to inserts/update/deletes on test.customer and
>test2.customer, will the trigger on public.customer fire? In this case
>the shipto table does not exist in either schema test or test2, but I
>need to make sure the trigger will fire when modifications are made to
>the customer table in those schemas.
>
>#2. Will inserts on the inherited table increment the user_id in the
>public.customer table? (I'm fairly sure that it will, just wnat to be
>certain.)
>
>#3. With regards to the constraint, will it applied to the inherited
>tables (I.E. only able to insert customer_notification when it contains a
>value of 0, 1, or 2?) (I am fairly certain it will, but want to be sure!)
>
>#4. This is where I get really confused.. :-( With regards to the
>REFERENCES customer(name), does this apply to test2.proposals with
>regards to the test2.customer table? Would it be possible to insert a
>proposal that contained a user_id contained in test.customer, but not
>test2.customer?.... I just don't understand the documentation on this
>issue of foreign keys and what is actually inherited...
>
>Is there someplace I can look for a more thorough explanation of how
>postgres handles inheritance?
>
>
>Thanks as always!
>
>- Greg
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