unit3.~pas

作者针对当前酒店客房管理的现状

unit Unit3;

interface

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

type
  TForm3 = class(TForm)
    Label1: TLabel;
    Edit1: TEdit;
    Query1: TQuery;
    DBGrid1: TDBGrid;
    DataSource1: TDataSource;
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    procedure Button2Click(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form3: TForm3;

implementation

{$R *.dfm}

procedure TForm3.Button2Click(Sender: TObject);
begin
    close;
end;

procedure TForm3.Button1Click(Sender: TObject);
var Query:TQuery;
begin
   if Trim(Edit1.Text)<>'' then
   begin
        Query:=TQuery.Create(nil);
       Query.DatabaseName:='高校图书管理系统';
       Query.SQL.Add('select* from cangshub where Bookname=:shum');

      Query.ParamByName('shum').Asstring:=Trim(Edit1.Text);
      Query.Open;
     if Query.RecordCount<0 then
       begin
       ShowMessage('不存在此项记录!');
       exit;
       end;

    end;

end;

procedure TForm3.Button3Click(Sender: TObject);
begin
   Edit1.Clear;
end;

end.