From: Mulham freshcode <mulhamcode@yahoo.com>
To: aklaver@comcast.net
To: pgsql-sql@postgresql.org
Subject: Re: select into
Date: Fri, 24 Nov 2006 20:17:43 -0800 (PST)
Message-ID: <20061125041743.60657.qmail@web90513.mail.mud.yahoo.com> (raw)
In-Reply-To: <200611240730.33837.aklaver@comcast.net>
Hi Adrian,
I have number of similar tables that have different number of fields (similar in functionality). An in my stored procedure am trying to select a row from one of these tables (that i don't know in advance, hence the use of record) and return the data in the form of a table that has column_name:value pairs. where column name is that from the original table. I have no problem finding the column names but I don't know how to say data[column_name] to get the corresponding value. Is there a way to do it in pgsql?
here is my code so far
sql_str1 = 'select * from ' || svc_tbl_name || ' where uid = ' || sub_id ;
for svc_data_rec in execute sql_str1 loop
end loop;
-- get service_user table's column names
for col_name in select column_name
from information_schema.columns
where table_name~svc_tbl_name loop
raise notice 'Column name:%', col_name.column_name;
raise notice 'Value: %', svc_data_rec[col_name.column_name];
end loop;
Thank you,
Mustafa ...
Adrian Klaver <aklaver@comcast.net> wrote: On Thursday 23 November 2006 10:54 pm, Mulham freshcode wrote:
> Hi Tom,
>
> Thanks for the help. Am using version 8.0 and it seems like RECORD is not
> that dynamic still. I tried with the FOR ... IN EXECUTE ... LOOP and it
> does the trick. But am still finding it hard to move forward with this. I
> have the name of table field in a varchar variable that i got from
> information_schema.columns and I have the records variable that stores the
> contains the data from that table. Usually I'd do something like
> data_rec.col_name to extract the data from the record but now I don't know
> the name per se. how can i say something like data_rec[col_name] where
> col_name is a variable that has the actual column name. I found no examples
> in the docs that explain this. Can it be done in version 8.0.1?
>
> I find variable substitution kind of confusing. I mean why is there no way
> of saying explicitly replace this variable with its content before
> executing the statement?
>
> Sorry for the long question,
> and thanks again for the help
>
> Mustafa...
>
> Tom Lane wrote: Mulham freshcode writes:
> > execute sql_str1 into svc_data_rec ;
> >
> > svc_data_rec is a RECORD, which is supposed to be dynamic.
>
> This should work --- in PG 8.1 or later. In older versions you'd have
> to fool around with a FOR ... IN EXECUTE ... loop.
>
> regards, tom lane
>
I am trying to sort this out. Are you trying to find the data for a single
field from each table, or for some set of fields?. If you are looking for
data from a single field couldn't you dispense with the RECORD variable and
just build a query of the form SELECT col_name FROM tbl_name. If you want to
go through a set of fields then it would involve some nested loops.
--
Adrian Klaver
aklaver@comcast.net
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To: pgsql-sql@postgresql.org
Cc: mulhamcode@yahoo.com, aklaver@comcast.net
Subject: Re: select into
In-Reply-To: <20061125041743.60657.qmail@web90513.mail.mud.yahoo.com>
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