mapper.insert(record);
Pkblobs newRecord = new Pkblobs();
newRecord.setId(3);
newRecord.setBlob2(generateRandomBlob());
mapper.updateByPrimaryKeySelective(newRecord);
Pkblobs returnedRecord = mapper.selectByPrimaryKey(3);
assertNotNull(returnedRecord);
assertEquals(record.getId(), returnedRecord.getId());
assertTrue(blobsAreEqual(record.getBlob1(), returnedRecord