serverdatamodule.pas

《delphi数据库设计与实例开发》随书光盘

unit ServerDataModule;

{$WARN SYMBOL_PLATFORM OFF}

interface

uses
  Windows, Messages, SysUtils, Classes, ComServ, ComObj, VCLCom, DataBkr,
  DBClient, DCOMServerPro_TLB, StdVcl, Provider, DB, ADODB;

type
  TDCOMServer = class(TRemoteDataModule, IDCOMServer)
    ADOConnection1: TADOConnection;
    ADOQuery1: TADOQuery;
    DataSetProvider1: TDataSetProvider;
    procedure ADOQuery1AfterOpen(DataSet: TDataSet);
    procedure RemoteDataModuleCreate(Sender: TObject);
    procedure RemoteDataModuleDestroy(Sender: TObject);
  private
    { Private declarations }
  protected
    class procedure UpdateRegistry(Register: Boolean; const ClassID, ProgID: string); override;
  public
    { Public declarations }
  end;

implementation

{$R *.DFM}
uses ShowCount;

class procedure TDCOMServer.UpdateRegistry(Register: Boolean; const ClassID, ProgID: string);
begin
  if Register then
  begin
    inherited UpdateRegistry(Register, ClassID, ProgID);
    EnableSocketTransport(ClassID);
    EnableWebTransport(ClassID);
  end else
  begin
    DisableSocketTransport(ClassID);
    DisableWebTransport(ClassID);
    inherited UpdateRegistry(Register, ClassID, ProgID);
  end;
end;

procedure TDCOMServer.ADOQuery1AfterOpen(DataSet: TDataSet);
begin
 Form1.IncQueryCount;
end;

procedure TDCOMServer.RemoteDataModuleCreate(Sender: TObject);
begin
 Form1.UpdateClientCount(1);
end;

procedure TDCOMServer.RemoteDataModuleDestroy(Sender: TObject);
begin
 Form1.UpdateClientCount(-1);
end;

initialization
  TComponentFactory.Create(ComServer, TDCOMServer,
    Class_DCOMServer, ciMultiInstance, tmApartment);
end.