PkonlyExample example = new PkonlyExample();
example.createCriteria().andIdGreaterThan(4);
int rows = mapper.updateByExampleSelective(key, example);
assertEquals(2, rows);
example.clear();
example.createCriteria()
.andIdEqualTo(5)
.andSeqNumEqualTo(3);
rows = mapper.countByExample(example);