Three methods for MongoDB to save Java objects

MongoDB has three methods to save java objects. One is to implement the DBObject interface through a class, and the other is to use the object ing function of the spring-mongodb tool, converts a java object to the BSON document of MongoDB. One is to convert the object to binary storage through a serialization instance. MongoDB supports binary data format. The following describes three methods:

1. Implement the DBObject Interface

If this method is used, the class is still a DBObject. The put and get methods are used to access object attributes, which is inconvenient. For details, refer to the example on the official website:

1. Public ClassTweetImplementsDBObject {
2. /*...*/
3. }

1. Tweet myTweet =NewTweet ();
2. MyTweet. put ("User", UserId );
3. MyTweet. put ("Message", Msg );
4. MyTweet. put ("Date",NewDate ());
6. Collection. insert (myTweet );

1. Collection. setObjectClass (Tweet.Class);
3. Tweet myTweet = (Tweet) collection. findOne ();

1. Tweet myTweet = (Tweet) collection. findOne ();
2. MyTweet. put ("Message", NewMsg );
4. Collection. save (myTweet );

You may have discovered that this method only applies to new classes. It is not suitable for the original classes.

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