Обсуждение: Re: Work Around For Oracle Feature

Hi!
I've been unable to get nested queries to work.  e.g:

select x,y from z where y in (select r from t);

fails in a JDBC call (JBoss JDBC Driver).  I wound up having to do =>

select r from t;

iterate through the result set and build a string list of  str = 'a,b,c...',
then do a select like:

"select x,y from z where y in (" + str + ")"

Anyone have any ideas?

"David Griffiths" <dgriffiths@boats.com> wrote in message
news:a4bu6e$2ipc$1@jupiter.hub.org...
> One of our two databases uses context indexes on a column.
>
> If your not familiar, this is part of the Oracle interMedia option. The
idea
> here is to be able to search for words within a text block. The text block
> is in a row, in one of the columns. It can also be HTML, a Word document,
> etc. When you index the column, it speeds up finding matching words.
>
> Once that's done, you can search like this:
>
> SELECT SCORE(1) title FROM news_items
>            WHERE CONTAINS(text, 'Bolivia', 1) > 0;
>
> This would find all rows in the table "news_item" that has the text
> "Bolivia" in the "title" column.
>
> SELECT SCORE(1) title FROM news_items
>            WHERE CONTAINS(text, 'Bolivia OR Peru', 1) > 0;
>
> This would find all rows in the table "news_item" that has the text
> "Bolivia" or "Peru" in the "title" column in any order.
>
> This is the most basic usage of the interMedia (you can get it to do a
> soundex to match a sound, or get a "near" match or fuzzy match rather than
> an exact match, etc.)
>
> But I'm looking for the basic "return all rows where the text in this
column
> returns this word or these words".
>
> My two thoughts are, write my own function in PERL, or store the text in a
> file outside the database and use some OS-features to do the search
>
> Any suggestions?
>
> David
>
>
>

"Kelly McTiernan" <kelly.mctiernan@verizon.net> writes:

> Hi!
> I've been unable to get nested queries to work.  e.g:
>
> select x,y from z where y in (select r from t);
>
> fails in a JDBC call (JBoss JDBC Driver).  I wound up having to do =>

"Fails".  What's the error message you get?  That kind of query works
fine in general.  Have you tried the same query in 'psql' to see if it
works there?

-Doug
--
Let us cross over the river, and rest under the shade of the trees.
   --T. J. Jackson, 1863

"Kelly McTiernan" <kelly.mctiernan@verizon.net> writes:
> I've been unable to get nested queries to work.  e.g:

> select x,y from z where y in (select r from t);

Looks fine to me.  What happens exactly?

            regards, tom lane

On Sat, 23 Feb 2002, Kelly McTiernan wrote:

> Hi!
> I've been unable to get nested queries to work.  e.g:
>
> select x,y from z where y in (select r from t);

What error do you get?

My apologies.  I don't know what I wac doing wrong, but when I tried coding
it for a second time, it worked just fine!  I do still have a problem with
container managed transactions, but that's a JBoss issue (for that matter
Weblogic has similar issues).  I can get around that one by setting
transaction not-supported, and doing my own commits.  Thanks.

Kelly McTiernan
----- Original Message -----
From: "Stephan Szabo" <sszabo@megazone23.bigpanda.com>
To: "Kelly McTiernan" <kelly.mctiernan@verizon.net>
Cc: <pgsql-general@postgresql.org>
Sent: Monday, February 25, 2002 8:20 AM
Subject: Re: [GENERAL] Work Around For Oracle Feature


> On Sat, 23 Feb 2002, Kelly McTiernan wrote:
>
> > Hi!
> > I've been unable to get nested queries to work.  e.g:
> >
> > select x,y from z where y in (select r from t);
>
> What error do you get?
>
>
>