Question

I have the following based on another SE question ( Hash Rings On PostgreSql)

CREATE TABLE sms.tablename
(
  id uuid,
  mdate date
)

And the partitions.

CREATE TABLE sms.tablename_partition_1 ( CHECK ( sms.hash(id) = '1' ) ) INHERITS (sms.tablename);
...
CREATE TABLE sms.tablename_partition_f ( CHECK ( sms.hash(id) = 'f' ) ) INHERITS (sms.tablename);

Now here is the problems.

When i add this trigger.

CREATE TRIGGER "delete_me"
  BEFORE DELETE
  ON sms.tablename
  FOR EACH ROW
  EXECUTE PROCEDURE sms.delete_me(E'\\x');

CREATE OR REPLACE FUNCTION sms.delete_me()
  RETURNS trigger AS
$BODY$

begin

    RAISE NOTICE 'HERE !!!';
    return OLD;

end;
$BODY$
  LANGUAGE plpgsql VOLATILE SECURITY DEFINER
  COST 100;

This trigger never runs …
I can’t see the NOTICE message.
Now if i apply the same trigger to another table ( Non-Partitioned ), it works fine it does its job , the row is removed and the notice message pops up.

More Info : “PostgreSQL 9.1.6 on i686-pc-linux-gnu, compiled by
gcc-4.4.real (Ubuntu 4.4.3-4ubuntu5.1) 4.4.3, 32-bit”

I’m just trying to avoid using stored procedures on the table and keeping the ORM Clean.

EDITED :

1) No Rules Exist On The Table Or Any Of the Tables Inherited , The Same Applied to Indexes Or PK’s.

2) Running the following command.

DELETE FROM sms.tablename WHERE id = 'a5e52a04-282f-4cf4-8347-a43d68725e6b';

3) Full SQL Showing This Problem.

http://pastebin.com/mZBFEtaY

Answer 1

The delete trigger fires on the child table that contains the row, not the parent. You must add the trigger to each child table.

DO                                                                
$$
DECLARE
  h text;
BEGIN
  FOR h IN SELECT to_hex(x) FROM generate_series(0,15) x LOOP
    EXECUTE format('CREATE TRIGGER "DeleteRedirector" BEFORE DELETE ON pproblem.%I FOR EACH ROW EXECUTE PROCEDURE pproblem.delete_me('''');',
                   'tablename_partition_'||h);
  END LOOP;
END;
$$;

Demo:

regress=# begin;
BEGIN
regress=# DELETE FROM pproblem.tablename;
NOTICE:  HERE !!!
NOTICE:  HERE !!!
NOTICE:  HERE !!!
DELETE 3
regress=# rollback;
ROLLBACK