library DBInstall;

{ Important note about DLL memory management: ShareMem must be the
  first unit in your library's USES clause AND your project's (select
  Project-View Source) USES clause if your DLL exports any procedures or
  functions that pass strings as parameters or function results. This
  applies to all strings passed to and from your DLL--even those that
  are nested in records and classes. ShareMem is the interface unit to
  the BORLNDMM.DLL shared memory manager, which must be deployed along
  with your DLL. To avoid using BORLNDMM.DLL, pass string information
  using PChar or ShortString parameters. }

uses
  ComServ,
  SysUtils,
  Classes,
  Forms,
  uFrmMain in 'uFrmMain.pas' {FrmMain};

{ Open the MainForm, the entertance of Library}
function OpenForm():integer; stdcall;
var
  FrmMain: TFrmMain;
begin
  FrmMain:=TFrmMain.Create(nil);
  FrmMain.ShowModal();
  result:=0;
  FrmMain.Free;
end;

exports
  DllGetClassObject,
  DllCanUnloadNow,
  DllRegisterServer,
  DllUnregisterServer,
  OpenForm;
{$R *.res}

begin
end.

unit uFrmMain;

interface

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

type
  TFrmMain = class(TForm)
    GroupBox1: TGroupBox;
    Label1: TLabel;
    Label2: TLabel;
    txtUserName: TEdit;
    txtPassword: TEdit;
    btnOK: TButton;
    dbConn: TADOConnection;
    ADOQuery1: TADOQuery;
    procedure FormShow(Sender: TObject);
    procedure btnOKClick(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

implementation

{$R *.dfm}

procedure TFrmMain.FormShow(Sender: TObject);
begin
  txtUserName.Text:='sa';
  txtPassword.Text:='';
end;

procedure TFrmMain.btnOKClick(Sender: TObject);
var
  isErrRetry: bool;
begin
  isErrRetry:=false;
  dbConn.ConnectionString:='Provider=SQLOLEDB.1;'
        +'Password='+Trim(txtPassword.Text)+';Persist Security Info=True;User ID='+Trim(txtUserName.Text)+';Data Source=localhost';
  try
    dbConn.Open();
    ADOQuery1.SQL.Text:='RESTORE DATABASE MyNwind FROM MyNwind_1';
    ADOQuery1.ExecSQL;
  except on E:Exception do
  begin
    if MessageDlg('存在错误:'+E.Message+'是否忽略',mtError,[mbRetry,mbIgnore],0)=mrRetry then
      isErrRetry:=true
    else
      isErrRetry:=false;
    end;
  end;
  dbConn.Close();

  if not isErrRetry then ModalResult:=mrOK;
end;

end.