Support Forums: Message List - Using the JDO Query Facility and JDOQL to Find Your Data http://www.theserverside.com Most recent forum messages en Jive Forums Silver 5.5.30 (www.jivesoftware.com) Mon, 20 May 2013 05:23:55 -0400 eg http://www.theserverside.com/discussions/thread.tss?thread_id=19015 Thu, 01 May 2003 03:31:27 -0400 Thu, 01 May 2003 03:31:27 -0400 Thu, 01 May 2003 03:31:27 -0400 May 1, 2003 Gavin King 0 ad hominem http://www.theserverside.com/discussions/thread.tss?thread_id=19015 Thu, 01 May 2003 03:29:26 -0400 Thu, 01 May 2003 03:29:26 -0400 Thu, 01 May 2003 03:29:26 -0400 May 1, 2003 Gavin King 1 queries http://www.theserverside.com/discussions/thread.tss?thread_id=19015 Thu, 01 May 2003 01:38:32 -0400 Thu, 01 May 2003 01:38:32 -0400 Thu, 01 May 2003 01:38:32 -0400 May 1, 2003 nextdb 2 joins http://www.theserverside.com/discussions/thread.tss?thread_id=19015 Wed, 30 Apr 2003 10:48:24 -0400 Wed, 30 Apr 2003 10:48:24 -0400 Wed, 30 Apr 2003 10:48:24 -0400 Apr 30, 2003 Gavin King 0 Performance http://www.theserverside.com/discussions/thread.tss?thread_id=19015 ...]]> Wed, 30 Apr 2003 06:26:13 -0400 Wed, 30 Apr 2003 06:26:13 -0400 Wed, 30 Apr 2003 06:26:13 -0400 Apr 30, 2003 Raul Davidovich 0 Performance http://www.theserverside.com/discussions/thread.tss?thread_id=19015 This is horribly inefficient and is just not how relational databases are intended to be used. This kind of approach causes killer n+1 problems once applications become sufficiently complicated. Relational data MUST be accessed...]]> Tue, 29 Apr 2003 17:57:53 -0400 Tue, 29 Apr 2003 17:57:53 -0400 Tue, 29 Apr 2003 17:57:53 -0400 Apr 29, 2003 Eric Samson 2 JDO / OR MApping / ODBMS http://www.theserverside.com/discussions/thread.tss?thread_id=19015 ...]]> Tue, 29 Apr 2003 17:46:59 -0400 Tue, 29 Apr 2003 17:46:59 -0400 Tue, 29 Apr 2003 17:46:59 -0400 Apr 29, 2003 Eric Samson 0 Vision on future of ORM http://www.theserverside.com/discussions/thread.tss?thread_id=19015 Remember, joining is what relational databases *do*. It is essential to the future success of ORM that tools are able to take full advantage of the underlying relational technology. Hibernate's approach to this is an O/R query...]]> Tue, 29 Apr 2003 17:33:01 -0400 Tue, 29 Apr 2003 17:33:01 -0400 Tue, 29 Apr 2003 17:33:01 -0400 Apr 29, 2003 Eric Samson 0 JOIN JDO Expert Group http://www.theserverside.com/discussions/thread.tss?thread_id=19015
Gavin you're welcome if you want to participate and promote your vision. <>
...]]> Tue, 29 Apr 2003 17:23:11 -0400 Tue, 29 Apr 2003 17:23:11 -0400 Tue, 29 Apr 2003 17:23:11 -0400 Apr 29, 2003 Eric Samson 0 Performance http://www.theserverside.com/discussions/thread.tss?thread_id=19015 This is horribly inefficient and is just not how relational databases are intended to be used. This kind of approach causes killer n+1 problems once applications become sufficiently complicated. Relational data MUST be accessed...]]> Tue, 29 Apr 2003 17:21:22 -0400 Tue, 29 Apr 2003 17:21:22 -0400 Tue, 29 Apr 2003 17:21:22 -0400 Apr 29, 2003 Eric Samson 0 Performance http://www.theserverside.com/discussions/thread.tss?thread_id=19015 This is horribly inefficient and is just not how relational databases are intended to be used. This kind of approach causes killer n+1 problems once applications become sufficiently complicated. Relational data MUST be accessed...]]> Tue, 29 Apr 2003 17:17:08 -0400 Tue, 29 Apr 2003 17:17:08 -0400 Tue, 29 Apr 2003 17:17:08 -0400 Apr 29, 2003 Eric Samson 0 Performance http://www.theserverside.com/discussions/thread.tss?thread_id=19015 Tue, 29 Apr 2003 17:16:23 -0400 Tue, 29 Apr 2003 17:16:23 -0400 Tue, 29 Apr 2003 17:16:23 -0400 Apr 29, 2003 Eric Samson 0 Queries - Aggregations http://www.theserverside.com/discussions/thread.tss?thread_id=19015 Aggregation is "low level"?? Almost all applications need to do some kind of analysis which means sorting, grouping, ordering (all at the same time). It is NOT efficient to do this in the business tier....]]> Tue, 29 Apr 2003 17:12:23 -0400 Tue, 29 Apr 2003 17:12:23 -0400 Tue, 29 Apr 2003 17:12:23 -0400 Apr 29, 2003 Eric Samson 0 Queries - Aggregations http://www.theserverside.com/discussions/thread.tss?thread_id=19015 Aggregation is "low level"?? Almost all applications need to do some kind of analysis which means sorting, grouping, ordering (all at the same time). It is NOT efficient to do this in the business tier....]]> Tue, 29 Apr 2003 17:10:51 -0400 Tue, 29 Apr 2003 17:10:51 -0400 Tue, 29 Apr 2003 17:10:51 -0400 Apr 29, 2003 Eric Samson 0 queries http://www.theserverside.com/discussions/thread.tss?thread_id=19015
This is why, IMHO, there is no need to deal with all the SQL possibilities at the JDOQL level: the only result you can get from a JDOQL queries is a Collection of Objects. <
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