Обсуждение: how to pass tablename to a function

Hi, All

I like to pass the tablename to function but not using execute clause, here
is my script

CREATE OR REPLACE FUNCTION functions.pgsql_event_unpack_batch(IN _tbl text,
IN jobid bigint, IN jobtime timestamp with time zone, IN startid bigint, IN
stopid bigint)
  RETURNS TABLE(events bigint, errors bigint[]) AS
$BODY$
BEGIN

RETURN QUERY
WITH
     unpacking (raw_id, time, userid, eventtype, pagename, userhost,
application, status, error)
     AS (
        select
              id as raw_id,
              (up).time,
              (up).userid,
              coalesce((up).eventtype, ''),
              coalesce((up).pagename, ''),
              (up).userhostaddress as userhost,
              coalesce((up).application, ''),
              (up).status,
              (up).error
         from(
              select id,
                     functions.python_events_unpack(event_object) up
              from  _tbl
              where id between startid and stopid
         ) a
         where (up).userid is not NULL
      )


I want to pass the _tbl to the select query integrated in the unpacking(),
how can I make it?

thanks

Alec






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-----Original Message-----
From: pgsql-general-owner@postgresql.org [mailto:pgsql-general-owner@postgresql.org] On Behalf Of alecinvan
Sent: Thursday, September 04, 2014 6:28 PM
To: pgsql-general@postgresql.org
Subject: [GENERAL] how to pass tablename to a function

Hi, All

I like to pass the tablename to function but not using execute clause, here is my script

CREATE OR REPLACE FUNCTION functions.pgsql_event_unpack_batch(IN _tbl text, IN jobid bigint, IN jobtime timestamp with
timezone, IN startid bigint, IN stopid bigint) 
  RETURNS TABLE(events bigint, errors bigint[]) AS $BODY$ BEGIN

RETURN QUERY
WITH
     unpacking (raw_id, time, userid, eventtype, pagename, userhost, application, status, error)
     AS (
        select
              id as raw_id,
              (up).time,
              (up).userid,
              coalesce((up).eventtype, ''),
              coalesce((up).pagename, ''),
              (up).userhostaddress as userhost,
              coalesce((up).application, ''),
              (up).status,
              (up).error
         from(
              select id,
                     functions.python_events_unpack(event_object) up
              from  _tbl
              where id between startid and stopid
         ) a
         where (up).userid is not NULL
      )


I want to pass the _tbl to the select query integrated in the unpacking(), how can I make it?

thanks

Alec


You can't.
You have to use dynamic sql (EXECUTE).

Regards,
Igor Neyman