Hi! I found this link: http://www.mail-archive.com/[email protected]/msg03571.html
Robert -----Original Message----- From: Alvaro Coronel [mailto:[EMAIL PROTECTED] Sent: Friday, June 01, 2007 4:05 PM To: Apache Torque Users List Subject: Re: AW: Joins and performance That sounds _very_ useful ! Robert, could you post the link if you find it? Thanks in advance, Álvaro. "Vitzethum, Daniel" <[EMAIL PROTECTED]> wrote: Hi Robert, > If I've 100 companies (which are schools) and 200 buildings, I will > executes 100 * 200 queries to get all the employees. be sure to avoid this... sounds like a killer ;-) > In low level SQL > this query can be combined in one query. Is there a way to handle this > within Torque? In Torque, you can use the Criteria.addJoin() method to link two tables. Using that feature, you cannot use the Peer.doSelect() method, but have to use Peer.doSelectVillageRecords(), which will return all columns of all joined tables in a village Record object, with no big difference to plain JDBC in handling. If you need or want Torque data objects, you have to extract them one by one from the result set. For a project of us, we wrote a helper class named JoinHelper that does this business for you AND returns an tree of Torque objects. In your case, it would return COMPANY objects that can be queried for their BUILDINGs, which again know their EMPLOYEEs. Please search the thread about two years ago in Torque archive and the discussion about. JoinHelper massively uses reflection, but is tested quite well and in production. If you have more detailled questions... you're welcome. Daniel --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------- Need a vacation? Get great deals to amazing places on Yahoo! Travel. --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
