How to update the MongoDB database in the program in Java

If the document has been stored, and now you want to add a description attribute to the document, you can update it like this: Mongo mongo = “bh_code_a_Java_keywords”>new Mongo( “bh_code_a_Java_keywords”>this.host, “bh_code_a_Java_keywords”>this.port); GridFS fs = “bh_code_a_Java_keywords”>new GridFS(mongo.getDB(“database”)); GridFSDBFile file = fs.find( “bh_code_a_Java_keywords”>new ObjectId(document.getId())); file.put( “bh_code_a_Java_string”>”description”, document.getDescription()); file. save(); You can also use the update method of DBCollection to update, DBObject queryCOndition= “bh_code_a_Java_keywords”>new BasicDBObject(); queryCondition. put( “bh_code_a_Java_string”>”_id”, document.getId()); Mongo mongo = “bh_code_a_Java_keywords”>new Mongo( “bh_code_a_Java_keywords”>this.host, “bh_code_a_Java_keywords”>this.port); DB db = mongo.getDB( “bh_code_a_Java_string”>”database”) DBCollection c = db.getCollection( “bh_code_a_Java_string”>”fs.files”); DBObject updatedValue= “bh_code_a_Java_keywords”>new BasicDBObject(); updatedValue. put( “bh_code_a_Java_string”>”description”, document.getDescription()); DBObject updateSetValue= “bh_code_a_Java_keywords”>new BasicDBObject( “bh_code_a_Java_string”>”$set”,updatedValue); c.update(updateSetValue, updateSetValue);