Pkfieldsblobs returnedRecord = mapper.selectByPrimaryKey(record.getId1(), record.getId2());
assertNotNull(returnedRecord);
assertTrue(TestUtilities.blobsAreEqual(record.getBlob1(), returnedRecord.getBlob1()));
record.setBlob1(TestUtilities.generateRandomBlob());
rows = mapper.updateByPrimaryKey(record);
assertEquals(1, rows);
returnedRecord = mapper.selectByPrimaryKey(record.getId1(), record.getId2());
assertNotNull(returnedRecord);
assertTrue(TestUtilities.blobsAreEqual(record.getBlob1(), returnedRecord.getBlob1()));