This post originated from an RSS feed registered with Java Buzz
by Brian McCallister.
Original Post: Thinking About Queries
Feed Title: Waste of Time
Feed URL: http://kasparov.skife.org/blog/index.rss
Feed Description: A simple waste of time and weblog experiment
I got into a very fun discussion with James Strachan about Groovy Data Objects -- which are modeled more after ADO than JDO. GDO looks like
collection.select {
where { b > 100 && b < 5000 }
orderBy {
ascending { [ b, c] }
desceding { x }
}
Or, for projections
collection.select {
property b {
get { bar.order.amount}
set { bar.order.amount = it }
}
where { b > 100 && b < 5000 }
orderBy {
ascending { [ b, c] }
desceding { x }
}
The idea of a query as an closure is appealing. I may have to try to do a GDO style query-as-closure for OJB during the hackathon. Groovy provides access to the AST of GroovyObjects, so traversing that building a query-by-criteria shouldn't be terrible. Off to code I go.