in query variables....

Started by Rhys A.D. Stewartover 17 years ago3 messagesgeneral
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#1Rhys A.D. Stewart
rhys.stewart@gmail.com

Hi all,

this is from the is there a way file.
Is there a way to get the name of the relation or relations in a query
from within the query? Like some kind of magic variable...?
for example :
"select *, <some_magic_variable> from thistable"
where <some_magic_variable> would be replaced by thistable.

Rhys
Peace & Love|Live Long & Prosper

#2Ismael ....
ismaelpsp@hotmail.com
In reply to: Rhys A.D. Stewart (#1)
Re: in query variables....

Hi all,

this is from the is there a way file.
Is there a way to get the name of the relation or relations in a query
from within the query? Like some kind of magic variable...?
for example :
"select *, from thistable"
where would be replaced by thistable.

Rhys
Peace & Love|Live Long & Prosper

No as far as I know, but you can create a stored procedure and pass
as parameter the table and then "create" your own query and
execute it from within the stored procedure

http://www.postgresql.org/docs/8.2/static/plpgsql-statements.html

EXECUTE 'UPDATE '|| some_magic_variable || ' SET '
|| quote_ident(colname)
|| ' = '
|| quote_literal(newvalue)
|| ' WHERE key = '
|| quote_literal(keyvalue);

I haven't tried it thought.
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#3Alvaro Herrera
alvherre@2ndquadrant.com
In reply to: Rhys A.D. Stewart (#1)
Re: in query variables....

Rhys A.D. Stewart escribi�:

Is there a way to get the name of the relation or relations in a query
from within the query? Like some kind of magic variable...?
for example :
"select *, <some_magic_variable> from thistable"
where <some_magic_variable> would be replaced by thistable.

select *, tableoid::regclass from thistable

--
Alvaro Herrera http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support