unit4.~pas

可以显示数据库中图书的信息以及读者的信息

unit Unit4;

interface

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

type
  TForm4 = class(TForm)
    ADOQuery1: TADOQuery;
    DataSource1: TDataSource;
    Button1: TButton;
    Label1: TLabel;
    Edit1: TEdit;
    Button2: TButton;
    DBNavigator1: TDBNavigator;
    DBGrid1: TDBGrid;
    Label2: TLabel;
    Edit2: TEdit;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Formclose(Sender: TObject; var Action: TCloseAction);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form4: TForm4;

implementation

uses Unit2;

{$R *.dfm}

procedure TForm4.Button1Click(Sender: TObject);
begin
  ADOQuery1.Close;
  ADOQuery1.SQL.Clear;
  ADOQuery1.SQL.Text:='SELECT * FROM 读者信息';
  ADOQuery1.open;
end;

procedure TForm4.Button2Click(Sender: TObject);
begin
  ADOQuery1.Close;
  ADOQuery1.SQL.Clear;
  ADOQuery1.SQL.Add('SELECT * FROM 读者信息 where(' + label1.Caption + ' like '+''''+'%' + edit1.Text + '%'+''''+')');
  ADOQuery1.SQL.Add('and(' + label2.Caption + ' like '+''''+'%' + edit2.Text + '%'+''''+')');
  ADOQuery1.open;
end;

procedure TForm4.Formclose(Sender: TObject; var Action: TCloseAction);
begin
   Form2.show;
   Form4.hide;
end;

end.