请大神指教，急急急急急急

Question

Criterion criterion = and(CxbbabaUserinfoEntity.UserID.eq(userId));

CxbbabaUserinfoEntity entity = userInfoRepository.where(criterion).singleOrDefault();
CxbbabaUserinfoEntity是与数据库中表对应的实体类，userInfoRepository是继承的CxbbabaUserinfoEntity
哪位大神能告诉我这两行代码各代表什么意思啊