public <T> Query<T> createQuery(final String collName, final Class<T> clazz) {
        DBCollection dbCollection = ds.getDB().getCollection(getCollName(collName));
        return new QueryImpl<T>(clazz, dbCollection, ds);
    }
@author Robert HG (254963746@qq.com) on 5/28/15.
lts-core/src/main/java/com/github/ltsopensource/store/mongo/MongoTemplate.java