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Question
testing for an empty dataset before deleting a record
How can i test if the dataset is empty before allowing an button click event to delete a record?
If it is empty i want to respond with an appropriate dialog box, but i can't figure out an effective way to check first that it doesn't happen to be empty
any clues?
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by: dejohn99Posted on 1998-09-30 at 08:06:32ID: 1341295
Either of these should work.
Wherever I have used DataSet1.Delete, you should put your normal Delete processing, whatever it may be.
procedure btnDelete1Click (Sender: TComponent)
begin
if DataSet1.RecordCount = 0 then
raise Exception.Create ('Dataset '+DataSet1.Name+' is empty');
DataSet1.Delete;
end;
procedure btnDelete2Click (Sender: TComponent)
begin
if DataSet1.RecordCount = 0 then
MessageDlg ('Dataset '+DataSet1.Name+' is empty',
mtError, [ mbCancel ], 0);
else
DataSet1.Delete;
end;
If you are concerned that the RecordCount may not be kept current, you might try this:
procedure btnDelete3Click (Sender: TComponent)
begin
{ EOF and BOF will only both be true for an empty dataset }
if DataSet1.EOF and DataSet1.BOF then
MessageDlg ('Dataset '+DataSet1.Name+' is empty',
mtError, [ mbCancel ], 0)
else
DataSet1.Delete;
end;