How to update MongoDb database in Java?

Question

I'm newbie with the MongoDb, there are a lot of examples about updating a collection in 2.x versions but I couldn't find any source about 3.x versions.

JAVA CODE:

    MongoClient mongoClient = new MongoClient("localhost",27017);
    MongoDatabase database = mongoClient.getDatabase("dbTest");
    MongoCollection<Document> collection =    database.getCollection("colTest");
    Document updateQuery = new Document();
    updateQuery.append("$set",
    new Document().append("_id", "test"));
    Document searchQuery = new Document();
    searchQuery.append("likes", "125");
    collection.updateMulti(searchQuery, updateQuery); //.updateMulti gives an error.

There isn't any updateMulti in 3.x so how can I check the id of the database and change one of the datas?

Example MongoDB:

 { 
"_id" : "test",
   "status" : 2,
   "time" : null,
   "instagram" :{
         "description" : "database",
         "likes" : 100,
         "url" : "http://www.instagram.com/",
         "by", "users"
   },
   "batchid" : 15000234
}

Expected Output:

{ 
   "_id" : "test",
   "status" : 1,
   "time" : null,
   "instagram" :{
         "description" : "database",
         "likes" : 125,
         "url" : "http://www.instagram.com/",
         "by", "users"
   },
   "batchid" : 15000234
}

radhakrishnan · Accepted Answer · 2017-02-24 09:41:33Z

4

For Mongodb-java driver:

Use updateOne method To update single Document within the collection based on the filter,

         collection.updateOne(searchQuery, updateQuery );

Use updateMany method, To Update multiple Documents within the collection based on the filter ,

         collection.updateMany(searchQuery, updateQuery );

Example,

        MongoClient client = new MongoClient("localhost",27017);
        MongoDatabase db = client.getDatabase("TestDB");
        MongoCollection<Document> collection = db.getCollection("test");
        Document query = new Document();
        query.append("_id","test");
        Document setData = new Document();
        setData.append("status", 1).append("instagram.likes", 125);
        Document update = new Document();
        update.append("$set", setData);
        //To update single Document  
        collection.updateOne(query, update);

edited Feb 24, 2017 at 9:41

answered Feb 24, 2017 at 9:28

radhakrishnan

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Comments

Vladi · Accepted Answer · 2022-08-24 08:12:51Z

0

so i wrote this function

 public void SetValueFromDB(String collectionName, String id, String id_value, String fieldOfChange, Object changToValue) {
        MongoCollection<Document> collection = database.getCollection(collectionName);
        BasicDBObject searchQuery = new BasicDBObject();
            searchQuery.append(id, id_value);
            Document setData = new Document();
            setData.append(fieldOfChange, changToValue);
            Document updateQuery = new Document();
            updateQuery.append("$set", setData);
            collection.updateOne(searchQuery, updateQuery);
    }

so for use it

db.SetValueFromDB("MyCollection","_id","test","likes",150);

edited Aug 24, 2022 at 8:12

answered Aug 24, 2022 at 7:29

Vladi

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