Thread: instead of trigger in pg

Hi,

I would like to implement a 1:n relation between two
tables. 
An auto-generated number should be used as primary key
which connects both tables. 
Example:

table 1:
name | number (prim_key)

table 2:
country | number_table1 (foreign key)

View:
number_table1 | name | country 

I would like to insert into both tables in one step.
"Insert into view (name,
country)values('name','country');"

Oracle supports an instead-of-trigger but Postgres
doesn't do this.

CREATE or replace FUNCTION insertInto() RETURNS
trigger AS '   BEGIN       insert into table1(name)values(NEW.name);       insert into
table2(number,country)values(NEW.number,NEW.country);       RETURN NEW;   END;
' LANGUAGE plpgsql;

CREATE TRIGGER insert_TR BEFORE INSERT OR UPDATE ON
view   FOR EACH ROW EXECUTE PROCEDURE insertInto();


I would like to implement something like this but I
don't know how to do.

Thank you for you help!

Jakob


    
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On 12/28/05, J Crypter <jcrypter@yahoo.de> wrote:
> Hi,
>
> I would like to implement a 1:n relation between two
> tables.
> An auto-generated number should be used as primary key
> which connects both tables.
> Example:
>
> table 1:
> name | number (prim_key)
>
> table 2:
> country | number_table1 (foreign key)
>
> View:
> number_table1 | name | country
>
> I would like to insert into both tables in one step.
> "Insert into view (name,
> country)values('name','country');"
>
> Oracle supports an instead-of-trigger but Postgres
> doesn't do this.
>

postgres uses rules for this situation... and yes there are INSTEAD OF rules...

> CREATE or replace FUNCTION insertInto() RETURNS
> trigger AS '
>    BEGIN
>        insert into table1(name)values(NEW.name);
>        insert into
> table2(number,country)values(NEW.number,NEW.country);
>
>        RETURN NEW;
>    END;
> ' LANGUAGE plpgsql;
>
> CREATE TRIGGER insert_TR BEFORE INSERT OR UPDATE ON
> view
>    FOR EACH ROW EXECUTE PROCEDURE insertInto();
>
>
> I would like to implement something like this but I
> don't know how to do.
>
> Thank you for you help!
>
> Jakob
>
>
>
>
>
>
> ___________________________________________________________
> Telefonate ohne weitere Kosten vom PC zum PC: http://messenger.yahoo.de
>
> ---------------------------(end of broadcast)---------------------------
> TIP 6: explain analyze is your friend
>


--
Atentamente,
Jaime Casanova
(DBA: DataBase Aniquilator ;)