delphi把Clientdataset的Delta保存到数据库

 //ATableName-表名, AKeyField-主键，多个主键用;隔开，如 ;pid;times;  from：unit HlsImplBase;

function THlsImplBase.UpdateTableData(ATableName, AKeyField: AnsiString; var AData: Variant): Boolean;
var
  LSql: string;
  LDataSet: TDataSet;
  LProvider:  TProvider;
  LErrCount: Integer;
  I: Integer;
begin
  Result := False;
  if ATableName = '' then Exit;
  if AKeyField = '' then Exit;
 
  LSql := 'select * from ' + ATableName + ' where 1 = 2';
  LDataSet := CreateDataSet(LSql);
  if not Assigned(LDataSet) then Exit;
 
  LProvider := TProvider.Create(nil);
  LProvider.UpdateMode := upWhereKeyOnly;
  LProvider.DataSet := LDataSet;
  AKeyField := LowerCase(AKeyField);
  for I := 0 to LDataSet.FieldCount - 1 do
  begin
    if (LowerCase(LDataSet.Fields[I].FieldName) = AKeyField) or
        (Pos(';' + LowerCase(LDataSet.Fields[I].FieldName) + ';', AKeyField) > 0) then
      LDataSet.Fields[I].ProviderFlags := LDataSet.Fields[I].ProviderFlags + [pfInKey]
    else
      LDataSet.Fields[I].ProviderFlags := [];
  end;
  try
    try
      LProvider.ApplyUpdates(AData, -1, LErrCount);
    except
    end;
    Result := LErrCount = 0;
  finally
    LDataSet.Free;
    LProvider.Free;
  end;
  
end;