u_form1.~pas

很好地delphi书籍源码

unit U_Form1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    Panel1: TPanel;
    DBGrid1: TDBGrid;
    Query1: TQuery;
    DataSource1: TDataSource;
    ComboBox1: TComboBox;
    Label1: TLabel;
    Database1: TDatabase;
    procedure FormCreate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure ComboBox1Change(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
{  with Query1 do
  begin
    Close;
    SQL.Clear;
    SQL.Add('select  distinct TKind from tbBookTicket') ;
    Open;
    First;
    while not eof do
    begin
      ComboBox1.Items.Add(FieldByName('TKind').AsString);
      Next;
    end;
  end;   }

end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  with Query1 do
  begin
    Close;
    Params[0].AsString:=ComboBox1.Text;
    Open;
  end;
end;

procedure TForm1.ComboBox1Change(Sender: TObject);
begin
  with Query1 do
  begin
    Close;
    Params[0].AsString:=ComboBox1.Text;
    Open;
  end;

end;

end.