How to store values in MONGO DB using JAVA?

Question

I want to make a blog post in my web application. Initially I was using mysql as DB. In which i will get the post entered in the text area of blog as an object in JS and send that object to java server side. There I will write mysql query and get the object in resultset and save in database. But now i want to use mongoDB for the same. I am able to understand the basic stuff through many tutorials which I learnt. But I am unable to implement that in my application. I want to know how the object that comes from the JS will be sent inside the loop and how I should query to save the object also similarly if I need to send a object from server side to JS. How should i do.?

My Server side code:

    public DB MongoConnection(Blog blog) throws UnknownHostException, MongoException{
    Mongo m = new Mongo("localhost" , 27017); //mongo object
    DB db = m.getDB("myblog");
    System.out.println("Connected");
    //making a collection object which is table when compared to sql
    DBCollection items = db.getCollection("items"); 
    System.out.println("items got");

   //to work with document we need basicDbObject        
    BasicDBObject query = new BasicDBObject();
    System.out.println("Created mongoObject");

      //Cursor, which is like rs in sql
    DBCursor cursor = items.find();
    System.out.println("items got");
     while(cursor.hasNext()){
        System.out.println(cursor.next());
    }

In the above code i understood everything such as how a mongo connection, documents, collections and cursor's work. Now how should i save the value coming as an object from JS and save in mongoDB. Any Suggestions Please?

@williams thanks I went through this tutorial before. my question is I am not able to compare this with mysql and implement it. i donot know how to implement. If i am vague sorry for that, just i wanted to explain my situation.I am a newbie trying to go forward. thanks. — IamIronMAN
– IamIronMAN, Commented Nov 30, 2010 at 19:53

Edward83 · Accepted Answer · 2010-11-30 20:24:38Z

1

Use method save of DBCollection class something like that:

while(cursor.hasNext()){
    DBObject doc = cursor.next();

    doc.put("name", "Leo-vin");

    items.save(doc);
}

method cursor.next() returns object of type DBObject. It is your BSONObject.

Update:

to modify document (BSON) use method put of class BSONObject

edited Nov 30, 2010 at 20:24

answered Nov 30, 2010 at 19:40

Edward83

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5 Comments

IamIronMAN Over a year ago

@Edward thanks. my object blog comes from js. is that object is obj in your answer or what? Please i am confused chnage your obj means How I should change? can you say in words.I wish to understand things and do.so pl can you explain.

Edward83 Over a year ago

MongoDB does not store records like relative dbs. It stores documents;)

Edward83 Over a year ago

@Leo-vin, i changed obj to doc. It will be more understandable to read;

Edward83 Over a year ago

@Leo-vin, i think that as first step you can try to convert your tables into BSON docs. It is not very "true" conversion, but it can work! So, one table's record -> one bson document. Sorry! I can't help in such conversion because i do not have experience with relational databases;)

IamIronMAN Over a year ago

@edward thanks I am trying it. Thanks for your help. its very useful

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