key.setId(7);
key.setSeqNum(8);
mapper.insert(key);
PkonlyExample example = new PkonlyExample();
example.createCriteria().andIdGreaterThan(4);
int rows = mapper.deleteByExample(example);
assertEquals(2, rows);
example = new PkonlyExample();
List<Pkonly> answer = mapper.selectByExample(example);