On Mar 14, 2008, at 12:35 PM, Petite Abeille wrote:
On Mar 14, 2008, at 8:15 PM, Sennikov, Dimitri wrote:
How would I be able to do that in WO with EOF? Is there an easier way
than to get qualifiers for each month and create new
FetchSpecifications
for each of the months? Wouldn't this method create too much overhead
(ie 12 queries just for one report).
Short answer: don't bother with EOF for reporting and let the
database do the heavy lifting. You can always make the resulting
data set available to EOF through your favorite database level
representation such as views, store procedures, pipelined functions
or such.
EOF is meant to shield you away from SQL, in the same way as WOF
shield you from HTTP.
But for any non-trivial DMLs, you most likely want to use SQL
directly.
Good advice. However, the only thing I would add to this is that EOF's
role is to manage an object graph and relationships - and it does so
by hiding the sql. The SQL you're trying to run appears to be pretty
abstracted from that focus. If your data model included a relationship
between "months" and "projects" then it would be quite simple to
create a report like this. Or, even if there were just a "month"
entity, each month could use raw rows to get the count of projects
that fall between its own begin and end dates.
You probably already understand this and I'm just talking. :-)
T
-----
Timothy Worman
Programmer/Analyst
Graduate School of Education and Information Studies
University of California Los Angeles
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