PkblobsExample example = new PkblobsExample();
List<Pkblobs> answer = mapper.selectByExample(example);
assertEquals(2, answer.size());
example = new PkblobsExample();
example.createCriteria().andIdLessThan(4);
int rows = mapper.deleteByExample(example);
assertEquals(1, rows);
example = new PkblobsExample();
answer = mapper.selectByExample(example);