unit12.~pas

用户可选择不同权限进入系统。当以管理员权限进入系统时

unit Unit12;

interface

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

type
  TForm12 = class(TForm)
    ADOQuery1: TADOQuery;
    DataSource1: TDataSource;
    DBGrid1: TDBGrid;
    Label1: TLabel;
    Edit1: TEdit;
    Button1: TButton;
    procedure FormShow(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form12: TForm12;

implementation

{$R *.dfm}

procedure TForm12.FormShow(Sender: TObject);
begin
ADOQuery1.close;
ADOQuery1.SQL.Clear;
ADOQuery1.SQL.add('select 用户ID,用户姓名,学号,专业 from login ');
Adoquery1.Open;
end;

procedure TForm12.Button1Click(Sender: TObject);
begin
ADOQuery1.close;
ADOQuery1.SQL.Clear;
ADOQuery1.SQL.add('delete  from login where 用户ID = ''' +Edit1.Text+ '''');
ADOQuery1.ExecSQL;
ADOQuery1.close;
ADOQuery1.SQL.Clear;
ADOQuery1.sql.text:='select 用户ID,用户姓名,学号,专业 from login';
ADOQuery1.open;
edit1.text:='';
end;

end.