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
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 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? Assuming you are using plpgsql, see here: http://www.postgresql.org/docs/9.3/interactive/plpgsql-statements.html#PLPGSQL-STATEMENTS-EXECUTING-DYN or use a language like plpythonu. > > thanks > > Alec -- Adrian Klaver adrian.klaver@aklaver.com
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. -- View this message in context: http://postgresql.1045698.n5.nabble.com/how-to-pass-tablename-to-a-function-tp5817864p5817871.html Sent from the PostgreSQL - general mailing list archive at Nabble.com.