#mongo insert

[nofatclips]

Inserting Documents in MongoDB From Java

To insert an object into MongoDB, you create it and then invoke the insert() method on the DBCollection into which it has to be pushed into.

https://gist.github.com/nofatclips/5637783

The output shows that the driver added an ID field upon the call:

{ "site" : "nofatclips.com" , "author" : "DeK"} { "site" : "nofatclips.com" , "author" : "DeK" , "_id" : { "$oid" : "519e4cdb04089e005378ac14"}}

The ID can also be added explicitly, as a new instance of ObjectId:

doc.put("_id", new ObjectId());

[nofatclips]

Adding data to MongoDB

Before updating a collection, one obviously needs to insert data in it. The insert() method will create a new record:

db.products.insert( { item: "card", qty: 15 } )

An _id (primary key) value will be added automatically if not specified. If the primary key is specified but a document with that value already exist, you'll get an error:

> var card = db.products.findOne({"item": "card"}) > db.products.insert(card) E11000 duplicate key error index:     dek.products.$_id_  dup key:         { : ObjectId('5194973a65642aa95f1eb40f') }

If you want to insert a document (if new) or update an existing one, Mongo provides a useful wrapper around insert() and update(), the save() method:

> card.qty-=1 14 > db.products.save(card) > db.products.findOne() {         "_id" : ObjectId("5194973a65642aa95f1eb40f"),         "item" : "card",         "qty" : 14 }