Mongodb Java 3.0驱动程序误解

Question

I am using the java 3.0 Mongodb driver, and trying to use distinct. 我正在使用Java 3.0 Mongodb驱动程序，并尝试使用与众不同的驱动程序。

With the deprecated DBCollection I can do the following: 使用已弃用的DBCollection，我可以执行以下操作：

collection.distinct("tokens.account_id", new BasicDBObject("_id",new ObjectId(objectiId)))

However, I can't seem to accomplish the same thing using the newer MongoCollection. 但是，我似乎无法使用较新的MongoCollection完成相同的操作。

Answer 1

As per the new driver of MongoDB the API is bit changed Now we have to do 按照MongoDB的新驱动程序，API进行了更改，现在我们要做

collection.distinct("tokens.account_id",String.class).filter(new BasicDBObject("_id",new ObjectId(objectiId)))

Let me know if it works for you. 请让我知道这对你有没有用。