unit1.pas

一系列DELPHI的控件如何使用的例子,例子有的比较简单,但是能详细的说明了控件的使用,对许多刚涉足DELPHI的朋友会很有帮助的

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    GroupBox1: TGroupBox;
    Button1: TButton;
    Panel1: TPanel;
    DBGrid1: TDBGrid;
    Query1: TQuery;
    DataSource1: TDataSource;
    Edit1: TEdit;
    procedure Edit1Change(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Edit1Change(Sender: TObject);
begin
   with query1 do
     begin
     sql.Clear;
     sql.Add('select * from country where name like :demo');
     parambyname('demo').AsString:='%'+edit1.Text+'%';
     open;
     end;

end;

procedure TForm1.Button1Click(Sender: TObject);
begin
   close;
end;

end.