cha2.pas

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unit cha2;

interface

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

type
  TForm8 = class(TForm)
    Label1: TLabel;
    Label2: TLabel;
    DBText1: TDBText;
    PageControl1: TPageControl;
    TabSheet1: TTabSheet;
    Label3: TLabel;
    Label4: TLabel;
    Label5: TLabel;
    DBEdit1: TDBEdit;
    DBEdit2: TDBEdit;
    DBEdit3: TDBEdit;
    TabSheet2: TTabSheet;
    Label6: TLabel;
    Label7: TLabel;
    DBEdit4: TDBEdit;
    Button3: TButton;
    DBLookupComboBox1: TDBLookupComboBox;
    ADOConnection1: TADOConnection;
    ADOTable1: TADOTable;
    DataSource1: TDataSource;
    ADOTable2: TADOTable;
    DataSource2: TDataSource;
    DataSource3: TDataSource;
    ADOTable3: TADOTable;
    ComboBox1: TComboBox;
    procedure DBLookupComboBox1Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form8: TForm8;

implementation

{$R *.dfm}

procedure TForm8.DBLookupComboBox1Click(Sender: TObject);
begin
adotable2.Open;
adotable3.Open;
end;

procedure TForm8.Button3Click(Sender: TObject);
begin
if adotable3.Locate('选课',combobox1.Text,[]) then
messagebeep(0)
else
begin
showmessage('找不到数据');
dbedit4.Text:='';
end;
end;

end.