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
On 09/04/2014 04:42 PM, A L. wrote:
Hi, All
I like to pass the tablename to function but not using execute clause,
here is my scriptCREATE 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
$BODY$
BEGINRETURN 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?
Assuming you are using plpgsql, see here:
or use a language like plpythonu.
thanks
Alec
--
Adrian Klaver
adrian.klaver@aklaver.com
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alecinvan wrote
I like to pass the tablename to function but not using execute clause,
here is my script[...]
I want to pass the _tbl to the select query integrated in the unpacking(),
how can I make it?
There is no way to perform a query with an unknown, at design time,
identifier without using EXECUTE.
The recommended way to do this is to use "format()" and dollar-quoting -
v9.1+ required:
v_qry := format(
$qry$
WITH [...]
SELECT id, func(...) FROM %I WHERE id [...]
$qry$
, _tbl
);
RETURN QUERY EXECUTE v_qry;
David J.
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