FireDAC 应用 （主从表关系）

 



  1 //---------------------------------------------------------------------------
  2 
  3 // This software is Copyright (c) 2015 Embarcadero Technologies, Inc.
  4 // You may only use this software if you are an authorized licensee
  5 // of an Embarcadero developer tools product.
  6 // This software is considered a Redistributable as defined under
  7 // the software license agreement that comes with the Embarcadero Products
  8 // and is subject to that software license agreement.
  9 
 10 //---------------------------------------------------------------------------
 11 // 这里可以通过界面的设置，生成对应的主从关系
 12 unit fMasterDetail;
 13 
 14 interface
 15 
 16 uses
 17   Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
 18   Dialogs, DB, StdCtrls, ExtCtrls, Grids, DBGrids, Buttons, ComCtrls,
 19   fMainCompBase,
 20   FireDAC.Stan.Intf, FireDAC.DatS, FireDAC.Stan.Option, FireDAC.Stan.Param,
 21   FireDAC.Phys.Intf,
 22   FireDAC.DApt.Intf,
 23   FireDAC.Comp.Client, FireDAC.Comp.DataSet, FireDAC.Stan.Error;
 24 
 25 type
 26   TfrmMasterDetail = class(TfrmMainCompBase)
 27     cdsOrders: TFDMemTable;
 28     cdsOrdDetails: TFDMemTable;
 29     dsOrders: TDataSource;
 30     DBGrid1: TDBGrid;
 31     DBGrid2: TDBGrid;
 32     dsOrdDetails: TDataSource;
 33     Splitter1: TSplitter;
 34     adOrders: TFDTableAdapter;
 35     adOrderDetails: TFDTableAdapter;
 36     cmOrders: TFDCommand;
 37     cmOrderDetails: TFDCommand;
 38     chbFetchOnDemand: TCheckBox;
 39     pnlFetchOnDemand: TPanel;
 40     Button1: TButton;
 41     Button2: TButton;
 42     procedure cbDBClick(Sender: TObject);
 43     procedure chbFetchOnDemandClick(Sender: TObject);
 44     procedure Button1Click(Sender: TObject);
 45     procedure Button2Click(Sender: TObject);
 46   private
 47     { Private declarations }
 48   public
 49     { Public declarations }
 50   end;
 51 
 52 var
 53   frmMasterDetail: TfrmMasterDetail;
 54 
 55 implementation
 56 
 57 uses
 58   dmMainComp;
 59 
 60 {$R *.dfm}
 61 
 62 procedure TfrmMasterDetail.cbDBClick(Sender: TObject);
 63 begin
 64   with dmlMainComp.dbMain.FetchOptions do
 65     Items := Items - [fiMeta];
 66 
 67   cdsOrders.Close;
 68   cdsOrdDetails.Close;
 69   inherited cbDBClick(Sender);
 70   cdsOrders.Active := True;
 71   cdsOrdDetails.Active := True;
 72 end;
 73 
 74 procedure TfrmMasterDetail.chbFetchOnDemandClick(Sender: TObject);
 75 begin
 76   // In this mode the client dataset fetches additional packets of data as needed (for example,
 77   // as a user scrolls through data, or conducts a search).
 78   if chbFetchOnDemand.Checked then
 79     cdsOrders.FetchOptions.Mode := fmOnDemand
 80   else
 81     cdsOrders.FetchOptions.Mode := fmManual;
 82   if chbFetchOnDemand.Checked then
 83     cdsOrdDetails.FetchOptions.Mode := fmOnDemand
 84   else
 85     cdsOrdDetails.FetchOptions.Mode := fmManual;
 86 end;
 87 
 88 procedure TfrmMasterDetail.Button1Click(Sender: TObject);
 89 begin
 90   cdsOrders.ApplyUpdates();
 91   cdsOrdDetails.ApplyUpdates();
 92 end;
 93 
 94 procedure TfrmMasterDetail.Button2Click(Sender: TObject);
 95 begin
 96   cdsOrders.CancelUpdates();
 97   cdsOrdDetails.CancelUpdates();
 98   cdsOrders.Refresh;
 99   cdsOrdDetails.Refresh;
100 end;
101 
102 end.

 

posted @ 2017-02-10 14:24  fehdd  阅读(1084)  评论(0)    收藏  举报