Thanks John. That's what I suspected. Keep up the great work!
Fred ----- Original Message ---- From: John Siracusa <[EMAIL PROTECTED]> To: Rose::DB::Object list <rose-db-object@lists.sourceforge.net> Sent: Thursday, January 31, 2008 11:39:41 AM Subject: Re: [RDBO] Candidate for RDBO? On Jan 30, 2008 9:23 PM, Fred Cox <[EMAIL PROTECTED]> wrote: > I've got a Postgresql DBI select: > > SELECT COUNT(*) AS voters, SUM(liked) AS liked, SUM(liked) / CAST( COUNT(*) AS > real ) AS ratio FROM review_votes WHERE reviewid=? > > that works well, but I wasn't sure whether it would be practical to try to do > this with RDBO. I know the query builder works well, but that seems to be > oriented to the WHERE clause. The Manager is not going to help you with any query that does not return a set of rows that correspond to an interconnected tree of uniquely identified rows in one or more tables. In particular, once you add an aggregate function or group by clause, the resulting rows no longer correspond to unique rows in a table and therefore cannot be represented by Rose::DB::Object-derived objects. The QueryBuilder may be of some use for building the actual SQL query, but you will then need to run it using plain old DBI. I suggest encapsulating such queries in custom Manager methods. That will hide the DBI ugliness from calling code, and you can use (or not) QueryBuilder internally depending on your needs. -John ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Rose-db-object mailing list Rose-db-object@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/rose-db-object ____________________________________________________________________________________ Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Rose-db-object mailing list Rose-db-object@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/rose-db-object
