unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  ExtCtrls, DBCtrls, Grids, DBGrids, Db, DBTables, StdCtrls;

type
  TForm1 = class(TForm)
    Table1: TTable;
    DataSource1: TDataSource;
    DBGrid1: TDBGrid;
    DBNavigator1: TDBNavigator;
    Button1: TButton;
    Edit1: TEdit;
    Button2: TButton;
    Button3: TButton;
    Button4: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.Button1Click(Sender: TObject);
begin
  with Table1 do
  begin
    EditKey;
    FieldByName('Name').AsString := Edit1.Text;
    if not GotoKey then
      ShowMessage('Not found');
  end;
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  with Table1 do
  begin
    EditKey;
    FieldByName('Name').AsString := Edit1.Text;
    GotoNearest;
  end;
end;

procedure TForm1.Button3Click(Sender: TObject);
begin
  with Table1 do
  begin
    if not FindKey([Edit1.Text]) then
      ShowMessage('Not found');
  end;
end;

procedure TForm1.Button4Click(Sender: TObject);
begin
  with Table1 do
  begin
    FindNearest([Edit1.Text]);
  end;
end;

end.