u_rdm.pas

此案例是多层分布式应用程序,需要首先执行服务器应用程序prdmdemo3.exe

unit u_rdm;

{$WARN SYMBOL_PLATFORM OFF}

interface

uses
  Windows, Messages, SysUtils, Classes, ComServ, ComObj, VCLCom, DataBkr,
  DBClient, prdmdemo3_TLB, StdVcl, DBTables, Provider, ADODB, DB;

type
  TRDMDemo3 = class(TRemoteDataModule, IRDMDemo3)
    dspqry1: TDataSetProvider;
    dsptbl1: TDataSetProvider;
    Session1: TSession;
    dspqry2: TDataSetProvider;
    Query1: TQuery;
    Query2: TQuery;
    Table1: TTable;
    Database1: TDatabase;
    ADOConnection1: TADOConnection;
    ADOQuery1: TADOQuery;
    dspadoqry1: TDataSetProvider;
    ADOTable1: TADOTable;
    ADOQuery2: TADOQuery;
    dspadotbl1: TDataSetProvider;
    dspadoqry2: TDataSetProvider;
    ADOQuery3: TADOQuery;
  private
    { Private declarations }
  protected
    class procedure UpdateRegistry(Register: Boolean; const ClassID, ProgID: string); override;
    procedure querybysql(const sql: WideString); safecall;
  public
    { Public declarations }
  end;

implementation

{$R *.DFM}

class procedure TRDMDemo3.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 TRDMDemo3.querybysql(const sql: WideString);safecall;
begin
   query1.SQL.Clear;
   query1.SQL.Add(sql);
   query1.Prepare;
   query1.Open;
end;

initialization
  TComponentFactory.Create(ComServer, TRDMDemo3,
    Class_RDMDemo3, ciMultiInstance, tmApartment);
end.