about partitioning

On 4/1/06, fufay <fufay@126.com> wrote:

dear all,
i created a master table and a sub table which inherits the main table.
and then i made a trigger and a function that want to keep the master table
empty.
but the trigger didn't work anyway.when i inserted data into the table
"news",both the master table
and the sub table were inserted.
why? i just want the empty master table,any good ideas?
lots of thanks for all.

here r DDls:
-------------------------------------------------------------------------
--master table；
CREATE TABLE "public"."news" (
"id" SERIAL,
"title" VARCHAR(100) NOT NULL,
"content" VARCHAR NOT NULL,
"author" VARCHAR(50) NOT NULL,
"date" DATE DEFAULT now(),
CONSTRAINT "news_pkey" PRIMARY KEY("id")
)WITHOUT OIDS;

--rule；
CREATE RULE "news_current_partition" AS ON INSERT TO "public"."news"
DO INSTEAD (INSERT INTO news_001 (title, content, author) VALUES (new.title,
new.content, new.author));

--trigger；
CREATE TRIGGER "news_triggers" BEFORE INSERT
ON "public"."news" FOR EACH ROW
EXECUTE PROCEDURE "public"."deny_insert"();

--function；
CREATE OR REPLACE FUNCTION "public"."deny_insert" () RETURNS trigger AS
$body$
BEGIN
RETURN NULL;
END;
$body$
LANGUAGE 'plpgsql' IMMUTABLE CALLED ON NULL INPUT SECURITY INVOKER;

--sub table；
CREATE TABLE "public"."news_001" (
CONSTRAINT "news_001_date_check" CHECK ((date >= '2006-03-29'::date) AND
(date < '2006-04-28'::date))
) INHERITS ("public"."news")
WITHOUT OIDS;

Since the fields don't exist in news_001, it has to store them
somewhere - in the table it inherits from.

Inheritence is meant to be used to change something in the
substructure/child table/whatever.

If that object isn't in the child, it has to go back to the parent to
work out what to do (in your case, store the entry).

--
Postgresql & php tutorials
http://www.designmagick.com/

hi chris
as u know i'm a chinese and a freshman to postgres so forgive my poor
english.
child table "news_001" dose inherit the table "news".
for that reason it gets all fields which the master has,and i changed
nothing on it.
when i executed a query like
"INSERT INTO news(title,content,author) VALUES('just a test','test
too','fufay')"
it stored data both "news" and "news_001" that falls short of my
expectations.
since i did a rule to redirect the "INSERT" to the child and a trigger on
"news"
that "RETURN NULL" when get "INSERT" action,but they didn't work any way.
if we can't restrict to insert data into parent,we'll get two copies at
all --in parent and in child.

best regards
fufay

""chris smith"" <dmagick@gmail.com> д����Ϣ
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