Delphi(Pascal) 密码修改

unit PasswordChange;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ADODB, DB, Public_Function, login,Public_Variable;

type
  TForm_PasswordChange = class(TForm)
    grp1: TGroupBox;
    edt2: TEdit;
    edt3: TEdit;
    edt4: TEdit;
    lbl2: TLabel;
    lbl3: TLabel;
    lbl4: TLabel;
    btnAlter: TButton;
    btnclear: TButton;
    btnclose: TButton;
    qryDoQuery1: TADOQuery;
    dsDoDataSet1: TADODataSet;
    procedure btncloseClick(Sender: TObject);
    procedure btnAlterClick(Sender: TObject);
    procedure btnclearClick(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form_PasswordChange: TForm_PasswordChange;

implementation

{$R *.dfm}

procedure TForm_PasswordChange.btnAlterClick(Sender: TObject);
begin
{edt2 : 旧密码
edt3 : 新密码
edt4 : 确认密码}

（*edt2 : 旧密码
edt3 : 新密码
edt4 : 确认密码*）

if edt2.Text='' then 
begin application.MessageBox('旧密码不能为空','提示',mb_ok+mb_iconinformation);
 Exit;
 end else if edt3.Text='' then 

begin application.MessageBox('新密码不能为空','提示',mb_ok+mb_iconinformation); Exit; end 

else if edt4.Text='' then begin application.MessageBox('新密码不能为空','提示',mb_ok+mb_iconinformation); exit; end 

else if edt3.Text<>edt4.text then begin application.MessageBox('新密码输入两次不一致','提示',mb_ok+mb_iconinformation); exit; 

end; if(Trim(edt3.Text)=Trim(edt4.Text)) and (edt3.Text<>'') and (edt4.Text<>'') then 

begin qryDoQuery1.Close; qryDoQuery1.Prepared; 
qryDoQuery1.sql.clear; qryDoQuery1.SQL.Add(' select User_ID from Sys_users where User_ID= '''+ Current_user_ID +'''' );
 qryDoQuery1.Open; if qryDoQuery1.RecordCount>0 then begin if qryDoQuery1.Fields[0].AsString=Current_user_ID then 

begin qryDoQuery1.Close; qryDoQuery1.Prepared; qryDoQuery1.SQL.Clear; 
qryDoQuery1.SQL.Add('update Sys_users set Psd ='''+ Encode(Edt4.Text) +''' where User_ID='''+ Current_user_ID +'''');
 qryDoQuery1.ExecSQL; ShowMessage('修改成功!'); end else ShowMessage('修改失败!');
 end else showmessage('不能为空!'#13'或者两次密码不正确!!!'); edt2.Clear; edt3.Clear; edt4.Clear; 

end 

end;
 procedure TForm_PasswordChange.btnclearClick(Sender: TObject); 
begin edt2.Clear; edt3.Clear; edt4.Clear; 

end;
 procedure TForm_PasswordChange.btncloseClick(Sender: TObject); begin Self.Close; end; end.