Frank Schönheit - Sun Microsystems Germany wrote:
Hi Drew,
I think however - and I think that Frank's response answers it - that
the question is one of 'best practices'.
Actually, I am not completely sure what the original question was :)
There is a form that is about to be displayed to the user, the form will
have some filter appended to the SQL command saved with the form at
design time. How do I do so in the most efficient manner?
1 - Open the form on the desktop - update the filter property - call reload
2 - Alter the SQL statement prior to opening the form.
Good question!
Which is faster (more efficient)
- 2 looks like a better answer, doesn't it.
Yes.
This might then lead one to
conclude that it would be better to base your form on a QueryDefinition
rather then an embedded SQL command, since doing so allows you to easily
implement the workflow expressed in line 2 above.
Truth is though that Opening, Updating and Saving a query definition has
a cost also. If Im'm not mistaken, unless that querydefinition is set to
'run sql direct' then this cost includes a trip to the server.
If you update a query definition programmatically, no server traffic
should happen.
Excellent...hmmm, that old saying comes to mind...Trust but Verify.
This would be a good point to interject - Base supports, at least for
JDBC connectors, a logging mechanism that could be employed here for
profiling purposes..I think. Specifics of using this are on the wiki.
http://wiki.services.openoffice.org/wiki/Logging_JDBC_Activity
Do you really want to close every form when the user is done with it?
When would it be better to hide form instead?
Is using a QueryDefinition the only way to achieve the workflow in line 2?
Can you use call back procedures (my term for assigning listeners, sorry
old habit) to catch the form load event, prior to the dataform actually
loading data, and add the filter condition at that point?
The XRowSetApproveListener might come handy here: It's called before the
actual execution of the RowSet/Form happens, and it should be possible
to modify the statement/filter/order/other in this callback.
Again, Excellent...now if we could do that with Sun Report Builder
generated reports that would just be supper.. or can we? (didn't see
that one coming did you...)
Drew
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
