find in MongoCollection

Question

I have a MongoCollection in which I assign a collection. I\'m trying to find a user by his id.

user = (Document) usersCollection         


        

Answer 1

If you using IP to connect to MongoDb here how you do it change HEREYOURIP

import static com.mongodb.client.model.Filters.eq;

public static Document GetDocumentFromDataBase(String dataBase,String DBcollection,String field, String value) {
MongoClient mongoClient = new MongoClient(  " HEREYOURIP ",27017 );
MongoDatabase database =  mongoClient.getDatabase(dataBase);
MongoCollection collection = database.getCollection(DBcollection);
Document myDoc = collection.find(eq(field, value)).first();
    mongoClient.close();
    return myDoc;}

edited found other way do it

public static String GetFromDB(String DATABASE_NAME,String collectionName, String field, String value) {
        String valueBack;
        BasicDBObject whereQuery = new BasicDBObject();
        whereQuery.put("_id", new ObjectId(value));
        
        MongoClient mongoClient = new MongoClient(System.getenv("HERE_YOUR_DB_IP"), 27017);
        MongoDatabase database = mongoClient.getDatabase(DATABASE_NAME);
        MongoCollection collection = database.getCollection(collectionName);
        Document myDoc = collection.find(whereQuery).first();
        if (myDoc != null) {

            valueBack = myDoc.toString();
            mongoClient.close();
            return valueBack;
        }
        mongoClient.close();
        return null;

    }