unit5.~pas

本系统用delphi语言和sql数据库

unit Unit5;

interface

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

type
  TForm5 = class(TForm)
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    Edit1: TEdit;
    Edit2: TEdit;
    Edit3: TEdit;
    Button1: TButton;
    Button2: TButton;
    DataSource1: TDataSource;
    Table1: TTable;
    Label4: TLabel;
    procedure Button2Click(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form5: TForm5;

implementation

{$R *.dfm}

procedure TForm5.Button2Click(Sender: TObject);
begin
close;
end;

procedure TForm5.Button1Click(Sender: TObject);
var
pwd:string;
begin
if (length(edit1.text)>20) or (length(edit2.text)>20) or (length(edit3.text)>20) then
begin
showmessage('密码长度超过20位！');
edit1.text:='';
edit2.Text:='';
edit3.Text:='';
exit;
end;
table1.Open;
table1.first;
pwd:=table1['pass'];
if (edit1.Text=pwd) then
begin
if (edit2.text=edit3.Text) then
begin
table1.edit;
table1['pass']:=edit2.Text;
table1.Post;
table1.Refresh;
edit1.text:='';
edit2.Text:='';
edit3.Text:='';
showmessage('密码已修改！');
table1.Close;
close;
end
else
begin
showmessage('新密码两次输入不同！');
edit1.text:='';
edit2.Text:='';
edit3.Text:='';
end;
end
else begin
showmessage('旧密码不正确！');
end;
table1.Close;
end;

end.