TIndexDefs.Update Method

Refreshes index definitions in Items to reflect the current state of the dataset.

Pascal

procedure Update; reintroduce;

C++

__fastcall Update();

Description

Call Update when the set of indexes for the dataset may have changed. Update refreshes the index definitions without opening the dataset.

C++ Examples:

Copy Code

/*
This example uses the IndexName property to sort the records
in a client dataset on the Field2 field.
*/
void __fastcall TForm1::Button3Click(TObject *Sender)
{
  // If Active is True, Update will remove Fields added in FormCreate
  // and add the DEFAULT_ORDER and CHANGEINDEX Fields
  CDS2->Active = False;
  // Get the current available indices
  CDS2->IndexDefs->Update();
  // Find a field named "Field2"
  for (int I = 0; I < CDS2->IndexDefs->Count; I++)
    if (CDS2->IndexDefs->Items[I]->Fields == "Field2")
    {
      // set that index as the current index for the dataset}
      CDS2->IndexName = CDS2->IndexDefs->Items[I]->Name;
    }
  CDS2->Active = True;
}

Delphi Examples:

Copy Code

{
This example uses the IndexName property to sort the records
in a client dataset on the Field2 field.
}
procedure TForm1.Button3Click(Sender: TObject);
var
  I : Integer;
begin
  // If Active is True, Update will remove Fields added in FormCreate
  // and add the DEFAULT_ORDER and CHANGEINDEX Fields
  CDS2.Active := False;
  { Get the current available indices }
  CDS2.IndexDefs.Update;
  { Find a field named 'Field2' }
  for I := 0 to CDS2.IndexDefs.Count - 1 do
    if CDS2.IndexDefs.Items[I].Fields = 'Field2' then
    begin
      { set that index as the current index for the dataset}
      CDS2.IndexName := CDS2.IndexDefs.Items[I].Name;
    end;
  CDS2.Active := True;
end;