PkfieldsblobsWithBLOBs record = new PkfieldsblobsWithBLOBs(3, 4, "Jeff", "Smith", generateRandomBlob());
mapper.insert(record);
PkfieldsblobsWithBLOBs updateRecord = new PkfieldsblobsWithBLOBs(3, 4, null, "Jones", null);
int rows = mapper.updateByPrimaryKeySelective(updateRecord);
assertEquals(1, rows);
PkfieldsblobsKey key = new PkfieldsblobsKey(3, 4);
PkfieldsblobsWithBLOBs returnedRecord = mapper.selectByPrimaryKey(key);
assertEquals(record.getFirstname(), returnedRecord.getFirstname());