On 01/04/2011 05:18 PM, [email protected] wrote:
On Tue, 4 Jan 2011, Koenraad Lelong wrote:
Hi,
I have a database (firebird) with master-data, detail-data and
sub-detail-data.
In lazarus 0.9.28.2, svn 22279, I defined a TIBConnection, a
TSQLTransaction and three TSQLQuery's. The detail has as its datasource
a datasource coupled with the master. The subdetail has as its
datasource a datasource coupled with the detail.
To show the data I have three TDBGrids, their datasources are those
three datasources coupled with the three queries.
When I start the application, the master that shows has several details,
each having several sub-details. When I scroll the details, the
subdetails follow the detail. That's good. But when I scroll the master,
only the details follow, the subdetail-grid goes blank.
To try finding what happens I added a button that opens the
sub-detail-query. If I click on it I get the expected subdetails. When I
scroll the master again, the subdetail disappears again. Again I can get
it back by clicking my debug-button.
To debug this further, I added events for beforescroll, afterscroll,
beforeclose and beforeopen for all three queries which write to a
logfile. It seems that the beforeclose event is not fired for the
subdetail-query, although it is closed somehow.
I hope this makes sense to someone. Is there anything I'm missing ? Or
have I found a bug ?
There is no principle difference between the master/detail and the
detail/subdetail relation, so I'd expect your setup to work.
Can you check whether the AfterScroll events occur for
master/detail/subdetail ?
Michael.
That's a bug I had encountered a very long time ago.
Stephano
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