datamoduleunit.pas

这是一个DELPHI7应用案例开发篇有配套程序种子光盘

unit DatamoduleUnit;

interface

uses
  {$IFDEF Linux}QForms, {$ELSE}Forms, {$ENDIF}
  SysUtils, Classes, DB, DBClient, MConnect, SConnect, DBXpress, FMTBcd,
  SqlExpr, Provider;

type
  TDataModule1 = class(TDataModule)
    cdsCustomer: TClientDataSet;
    SQLConnection1: TSQLConnection;
    tbCustomer: TSQLTable;
    dpCustomer: TDataSetProvider;
    qrBook: TSQLQuery;
    dpBook: TDataSetProvider;
    cdsBook: TClientDataSet;
    tbOrder2: TSQLTable;
    tbOrder1: TSQLTable;
    dsOrder2: TDataSource;
    cdsCarter: TClientDataSet;
    cdsCarterBookSerial: TStringField;
    cdsCarterBookCount: TBCDField;
    tb_book: TSQLTable;
    cdsCarterSellPrice: TBCDField;
    cdsCarterBookName: TStringField;
  private
  public
  end;

// Procs
  function DataModule1: TDataModule1;

implementation
{$R *.dfm}

uses
  IWInit,
  ServerController;

// Since we are threaded we cannot use global variables to store form / datamodule references
// so we store them in WebApplication.Data and we could reference that each time, but by creating
// a function like this our other code looks "normal" almost as if its referencing a global.
// This function is not necessary but it makes the code in the main form which references this
// datamodule a lot neater.
// Without this function ever time we would reference this datamodule we would use:
//   TDataModule1(WebApplication.Data).Datamodule.<method / component>
// By creating this procedure it becomes:
//   TDataModule1.<method / component>
// Which is just like normal Delphi code.
function DataModule1: TDataModule1;
begin
  Result := TUserSession(RWebApplication.Data).Datamodule1;
end;

end.