cxbdeadapters.pas

来自「胜天进销存源码,国产优秀的进销存」· PAS 代码 · 共 84 行

{********************************************************************}
{                                                                    }
{       Developer Express Visual Component Library                   }
{       ExpressDataController                                        }
{                                                                    }
{       Copyright (c) 1998-2008 Developer Express Inc.               }
{       ALL RIGHTS RESERVED                                          }
{                                                                    }
{   The entire contents of this file is protected by U.S. and        }
{   International Copyright Laws. Unauthorized reproduction,         }
{   reverse-engineering, and distribution of all or any portion of   }
{   the code contained in this file is strictly prohibited and may   }
{   result in severe civil and criminal penalties and will be        }
{   prosecuted to the maximum extent possible under the law.         }
{                                                                    }
{   RESTRICTIONS                                                     }
{                                                                    }
{   THIS SOURCE CODE AND ALL RESULTING INTERMEDIATE FILES            }
{   (DCU, OBJ, DLL, ETC.) ARE CONFIDENTIAL AND PROPRIETARY TRADE     }
{   SECRETS OF DEVELOPER EXPRESS INC. THE REGISTERED DEVELOPER IS    }
{   LICENSED TO DISTRIBUTE THE EXPRESSDATACONTROLLER AND ALL         }
{   ACCOMPANYING VCL CONTROLS AS PART OF AN EXECUTABLE PROGRAM ONLY. }
{                                                                    }
{   THE SOURCE CODE CONTAINED WITHIN THIS FILE AND ALL RELATED       }
{   FILES OR ANY PORTION OF ITS CONTENTS SHALL AT NO TIME BE         }
{   COPIED, TRANSFERRED, SOLD, DISTRIBUTED, OR OTHERWISE MADE        }
{   AVAILABLE TO OTHER INDIVIDUALS WITHOUT EXPRESS WRITTEN CONSENT   }
{   AND PERMISSION FROM DEVELOPER EXPRESS INC.                       }
{                                                                    }
{   CONSULT THE END USER LICENSE AGREEMENT FOR INFORMATION ON        }
{   ADDITIONAL RESTRICTIONS.                                         }
{                                                                    }
{********************************************************************}

unit cxBDEAdapters;

{$I cxVer.inc}

interface

uses
  DB, cxDBData, cxFilter, cxDBFilter;

type
  { TcxBDEFilterOperatorAdapter }

  TcxBDEFilterOperatorAdapter = class(TcxDBFilterOperatorAdapter)
  public
    procedure PrepareOperatorClass(ASender: TObject; ADataSet: TDataSet;
      var AOperatorClass: TcxFilterOperatorClass); override;
  end;

implementation

uses
  TypInfo, DBTables, cxVariants;

{ TcxBDEFilterOperatorAdapter }

procedure TcxBDEFilterOperatorAdapter.PrepareOperatorClass(ASender: TObject;
  ADataSet: TDataSet; var AOperatorClass: TcxFilterOperatorClass);
begin
  if AOperatorClass.InheritsFrom(TcxFilterNullOperator) or
    AOperatorClass.InheritsFrom(TcxFilterNotNullOperator) then
  begin
    if ADataSet is TQuery then
    begin
      if AOperatorClass.InheritsFrom(TcxFilterNotNullOperator) then
        AOperatorClass := TcxFilterSQLNotNullOperator
      else
        AOperatorClass := TcxFilterSQLNullOperator;
    end;
  end;  
end;

initialization
  cxFilterOperatorAdapters.RegisterAdapter(TQuery, TcxBDEFilterOperatorAdapter);

finalization
  cxFilterOperatorAdapters.UnregisterAdapter(TQuery, TcxBDEFilterOperatorAdapter);

end.