unit1.pas

成绩管理系统 主要实现：学生（学号

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Image1: TImage;
    Label1: TLabel;
    Label2: TLabel;
    Edit1: TEdit;
    Edit2: TEdit;
    Button1: TButton;
    Button2: TButton;
    ADOConnection1: TADOConnection;
    ADOQuery1: TADOQuery;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

uses Unit2;


{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
      if Edit1.text='' then
          showmessage('帐号不能够为空！请重新输入')
       else
           begin
               if Edit2.text=''then
                   showmessage('密码不能够为空，请确认后重新输入！')
                else
                    begin
                         adoquery1.Close;
                         adoquery1.SQL.Clear;
                         adoquery1.SQL.Add('select user_no from [user] where user_no='''+Edit1.Text+'''');
                         adoquery1.Open;

                         if adoquery1.RecordCount=0 then
                             showmessage('帐号输入有误请重新输入！')
                         else
                              begin
                                    adoquery1.Close;
                                    adoquery1.SQL.Clear;
                                    adoquery1.SQL.Add('select user_no from [user] where user_no='''+Edit1.Text+'''and user_pwd='''+Edit2.Text+'''');
                                    adoquery1.Open;
                                    if adoquery1.RecordCount=0 then
                                         showmessage('密码有误，请重新输入！')
                                    else
                                         begin
                                            form2.Show;
                                         end
                              end //}form2.show;

                    end
           end
//form2.show;
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
form1.Close;
end;



end.