解决ClientDataSet连接脱离框架导致某些字段无法在客户端修改值的问题

function: 解决ClientDataSet连接脱离框架导致某些字段无法在客户端修改值的问题
description: 将一个复制Data的clientdataset做成可写。因为直接赋值cdsData.data=cdsTemp.data会连着datasetprovider的一些东西一起赋值，readonly属性也会赋值
error1: EDatabaseError with message "Field "AA" cannot be modified
 如果仅仅修改cdsA.field[0].ReadOnly=false，在Post的时候回报error2
error2: EDBClient with message "Trying to modify read-only field
error3: Field "AA" must have a value

}

procedure SetCdsAllFieldCanEdit(cdsData: TClientDataSet);
var
  cdsTmp: TClientDataSet;
  I: Integer;
begin
  cdsTmp := TClientDataSet.Create(nil);
  try
    cdsData.DisableControls;
    cdsTmp.Data := cdsData.Data;
    cdsData.Close;
    cdsData.FieldDefs.Clear;
    for I:=0 to cdsTmp.FieldDefs.Count - 1 do
    begin
      with cdsData.FieldDefs.AddFieldDef   do
      begin
        DataType := cdsTmp.FieldDefs[I].DataType;
        Size := cdsTmp.FieldDefs[I].Size;
        Name := cdsTmp.FieldDefs[I].Name;
      end;
    end;
    cdsData.CreateDataSet;
    with cdsTmp do
    begin
      First;
      while not Eof do
      begin
        cdsData.Append;
        for I := 0 to Fields.Count - 1 do
          cdsData.Fields[I].Value := Fields[I].Value;
        Next;
      end;
    end;
    if cdsData.State in [dsInsert, dsEdit] then
      cdsData.Post;
    cdsData.MergeChangeLog;
  finally
    cdsData.EnableControls;
    cdsTmp.Free;
  end;
end;