datacontrol.pas

《delphi数据库设计与实例开发》随书光盘

unit DataControl;

interface

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

type
  TForm1 = class(TForm)
    Panel1: TPanel;
    DBImage1: TDBImage;
    Panel2: TPanel;
    DBMemo1: TDBMemo;
    DBNavigator1: TDBNavigator;
    DBGrid1: TDBGrid;
    DBText1: TDBText;
    DBText2: TDBText;
    Label1: TLabel;
    Label2: TLabel;
    Edit1: TEdit;
    Button1: TButton;
    Table1: TTable;
    DataSource1: TDataSource;
    procedure Button1Click(Sender: TObject);
    procedure FormCreate(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
 SetKey; //进入查询状态
 FieldByName('Species No').AsString:=edit1.text;
     {给查找字段的关键字赋值}
 if GotoKey then //执行查找
 Showmessage('查找成功！')
 else
 Showmessage('查找失败！');
 end;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  try
  Table1.Active:=true;
 except
  On E:EdatabaseError do
  ShowMessage(E.Message);
 end;
end;

end.