El 30/06/11 05:13, Luca Olivetti escribió:
Al 29/06/2011 17:53, En/na Julio César Gázquez ha escrit:
However, I found that in the OnEditButtonClick event I can't put the
dataset in dsEdit state, the Edit procedure has no visible effect and
the field assignment triggers an exception.
The same event handler attached to a regular button OnClick event works
as intended. The dataset is a Zeos TZQuery, but I'm not sure if this
could happen on a different kind of dataset.
Is this a known or expected behavior? There is a workaround?
Works here, lazarus 0.9.30, fpc 2.4.2, zeos 6.6.4 (with some local
modifications to make it compile under current lazarus).
(In my program I used a TRxDBGrid, and I'm quite pissed that now the
headings are awful, but I also tested with a plain TDbGrid).
FYI, my event handler (the column contains a color):
Mine is similar. I even reduced it to
if not (DMAsientosModelo.QueryImputaciones.State in dsWriteModes) then
DMAsientosModelo.QueryImputaciones.Edit;
DMAsientosModelo.QueryImputacionescodcuenta.Value:='1';
DMAsientosModelo.QueryImputacionesdesccuenta.Value:='xxx';
and the problem persisted. It also happens if I disconnect the update
object and if I disabled cached updates.
Today I tracked it into the FCL (using the CPU Window, I recompiled
fcl-db as I found in the wiki but I couldn't get the debugger diving
into the source), and I found:
1)It only happens in the first record of the dataset, in that case Edit
calls Append.
Procedure TDataset.Edit;
begin
If State in [dsedit,dsinsert] then exit;
CheckBrowseMode;
If Not CanModify then
DatabaseError(SDatasetReadOnly,Self);
If FRecordCount = 0 then
begin
Append;
Exit;
end;
If I fill the first row by hand and use the cell button on the second
row, it works as intended.
2) The append failed nearly the end of the operation, Appends just wraps
DoInsertAppend, the State is set to dsInsert but is put back to dsBrowse
shortly after. I'm not sure exactly where it happens, I'll try to dig
more tomorrow.
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