deleteTestData();
DataContext context = createDataContext();
ObjectContext childContext = context.createChildContext();
Painting childMaster = childContext.newObject(Painting.class);
childMaster.setPaintingTitle("Master");
PaintingInfo childDetail1 = childContext.newObject(PaintingInfo.class);
childDetail1.setTextReview("Detail1");
childDetail1.setPainting(childMaster);