盒子论坛 v2.1

用dbexperss写了点东东，不过还是不能用，贴出来，大家给点建议吧！
求大伙了！编译成功，但是好像没用啊！
————————————————dm模块——————————
unit DMpkU;

interface

uses
  SysUtils, Classes, DBXpress, DB, SqlExpr, DMIntrpk;

type
  Tdmpkg = class(TDataModule)
    SQLCon: TSQLConnection;
  private
  protected
    function GetCon: TSQLConnection;
  public
    { Public declarations }
  end;

var
  dmpkg: Tdmpkg;

implementation

{$R *.dfm}
function Tdmpkg.GetCon: TSQLConnection;
begin
  Result := SQLCon;
end;
initialization
  RegisterClass(Tdmpkg);
finalization
  UnRegisterClass(Tdmpkg);
end.
——————————————dm的引用——————————
unit DMIntrpk;

interface

uses
  SqlExpr,DBXpress;

type
  IDMpk = Interface
    ['{AA5658B0-9D55-48A2-A719-37A1D638FCD5}']
    function GetCon: TSQLConnection;
  end;

implementation

end.
————————————————mainform——————————
unit uMain;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, DMIntrpk, FMTBcd, StdCtrls, ExtCtrls, DBCtrls, Grids, DBGrids,
  DB, SqlExpr, Provider, DBClient, DBXpress, SimpleDS;

type
  TForm1 = class(TForm)
    DataSource1: TDataSource;
    DBGrid1: TDBGrid;
    DBNavigator1: TDBNavigator;
    Button1: TButton;
    SQLDataSet1: TSQLDataSet;
    ClientDataSet1: TClientDataSet;
    DataSetProvider1: TDataSetProvider;
    procedure FormCreate(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
    FpkHandle: THandle;
    FpkDM: IDMpk;
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
  FpkHandle := LoadPackage('1.bpl');
  if FpkHandle = 0 then
    ShowMessage('Can not load package dbmodu.bpl');
end;
procedure TForm1.FormDestroy(Sender: TObject);
begin
  SQLDataSet1.SQLConnection := nil;
  FpkDM := nil;
  if FpkHandle <> 0 then
    UnloadPackage(FpkHandle);
end;
procedure TForm1.Button1Click(Sender: TObject);
var
    AClass: TComponentClass;
begin
  if FpkHandle <> 0 then
  begin
    AClass := TComponentClass(GetClass('TDMpk'));
    if AClass <> nil then
    begin
      FpkDM := AClass.Create(nil) as IDMPk;
      SQLDataSet1.SQLConnection := FpkDM.GetCon;
      SQLDataSet1.Active:=true;
      ClientDataSet1.Active:=true;
    end;
  end;
end;
end.
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