asked on

How to delete the last record of a filtered ADO dataset.

Hi,

I have three TADOTables (1=TCompanies, 2=TClients, 3=TCompanyClients).
The last two tables are connected to the same DatabaseTable = Clients.

PROBLEM 1:
When I am on the company level and want to display a grid with the clients belonging to that company I use a filter on the TClients table.
When I an on the client level I use the Clients table without a filter.
When I delete the last record in the filtered dataset (TClients) and try to do a refresh of the table then I get an errormessage saying that the record is out of range (row changed, index bla bla bla).

PROBLEM 2:
The table TCompanyClients is only used to quickly determine if the company has any clients. It has the TCompany datasource assigned to it as the Mastersource.
If the selected company has at least one client then a menuitem "Show Clients of this company" is shown (else it will be hidden).
This table isn't updated correctly after I post or delete records into the TClients table. So the menuoption isn't correctly updated also.

Now I have solved this by closing and opening (in stead of refreshing) the TClients and TCompanyClients tables. But this is not a good solution as you can imagine.

*************************************************************
One remark: I don't want to change datasources on DBGrids, DBedits etc. on my form
*************************************************************

Please supply me with some code that will solve these two problems correctly.

Thanks a lot.
The Wiz

esoftbg

Would you like to use TADOQuery instead of TADOTable ?

esoftbg

This works for me:

procedure TForm1.adoqClientsNewRecord(DataSet: TDataSet);
begin
adoqClients.FieldByName('COMPANY_ID').AsInteger := adoqCompanies.FieldByName('ID').AsInteger;
end;

procedure TForm1.TClientsNewRecord(DataSet: TDataSet);
begin
TClients.FieldByName('COMPANY_ID').AsInteger := CompanyID;
end;

procedure TForm1.TCompaniesAfterScroll(DataSet: TDataSet);
begin
CompanyID := TCompanies.FieldByName('ID').AsInteger;
TClients.Filtered := False;
TClients.Filter :=''
+ 'COMPANY_ID = '
+ IntToStr(TCompanies.FieldByName('ID').AsInteger)
+ '';
TClients.Filtered := True;
if TClients.Active then
TClients.Requery([]);
end;

procedure TForm1.TClientsAfterDelete(DataSet: TDataSet);
begin
TClients.Requery([]);
TCompanyClients.Requery([]);
end;

procedure TForm1.TClientsAfterPost(DataSet: TDataSet);
begin
TCompanyClients.Requery([]);
end;

esoftbg

Please remove:

procedure TForm1.adoqClientsNewRecord(DataSet: TDataSet);
begin
adoqClients.FieldByName('COMPANY_ID').AsInteger := adoqCompanies.FieldByName('ID').AsInteger;
end;

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esoftbg

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Stef Merlijn

ASKER

Thanks a lot. Again..... :-)

esoftbg

You are welcome Delphiwizard !
:-))

Stef Merlijn