Cayenne has very nice functionality for paging large lists of objects, so that the list is mostly hollow objects which are retrieved in a lazy fashion as they are accessed.
This works well to fetch 100,000 contacts in a list and only draw the ones visible to the user as they scroll. What works less well is the common use case of a list view where you might only want to show several attributes of a large record. So a list of contacts might show just: * firstName * lastName * totalSales To fetch this data requires a query on contact with a prefetch to invoices. Lots of data being loaded from two or more tables and potentially a bit slow. Some options: 1. Use DataRows. This is simple, but you lose some of the nice modelling/entity features from Cayenne. You have to type all the columns yourself. 2. Create a view in the database with just three columns (plus a PK) and create a separate read-only Cayenne model which maps to that view. But now you are hardcoding your application to a specific database and changing the representation is hard. I want something half way between the two. SQLtemplate to fetch only the columns or aggregates I need, but mapped to some sort of read-only lightweight Cayenne entity. Has anyone tried something like this? Ari -- --------------------------> Aristedes Maniatis GPG fingerprint CBFB 84B4 738D 4E87 5E5C 5EFA EF6A 7D2E 3E49 102A
