Sorry that I forgot to sent you trigger on my database.
 
CREATE OR REPLACE FUNCTION lo_manage()
  RETURNS "trigger" AS
'$libdir/lo', 'lo_manage'
  LANGUAGE 'c' VOLATILE;
ALTER FUNCTION lo_manage() OWNER TO postgres;
 
>>> Tom Lane <tgl@sss.pgh.pa.us> 11-Oct-05 10:00:53 am >>>
"Premsun Choltanwanich" <Premsun@nsasia.co.th> writes:
> The code that show below is refered to table and function that I use for =
> kept BLOB (LO).
>  
> CREATE TABLE t_data_pic
> (
>   "sysid" bigserial NOT NULL,
>   data_sysid int8 NOT NULL,
>   data_pic lo,
>   CONSTRAINT t_data_pic_pkey PRIMARY KEY ("sysid")
> ) 
> WITH OIDS;
> ALTER TABLE t_data_pic OWNER TO admin;
Why am I not seeing any trigger attached to this table?  That lo_manage
trigger is the useful part of contrib/lo --- the separate data type is
mere window dressing.
regards, tom lane