record = new Fieldsonly();
record.setIntegerfield(22);
FieldsonlyExample example = new FieldsonlyExample();
example.createCriteria().andIntegerfieldEqualTo(5);
int rows = mapper.updateByExample(record, example);
assertEquals(1, rows);
example.clear();
example.createCriteria().andIntegerfieldEqualTo(22);
List<Fieldsonly> answer = mapper.selectByExample(example);