CRUD using the shell

The mongo shell is equivalent to the administration console used by relational databases. Connecting to the mongo shell is as easy as typing the following:

$ mongo

Type it on the command line for standalone servers or replica sets. Inside the shell, we can view available databases simply by typing the following:

$ db

And connect to a database by typing the following:

> use <database_name>

The mongo shell can be used for querying and updating data in our databases. Finding documents from a collection named books is as easy as the following:

> db.books.find()
{ "_id" : ObjectId("592033f6141daf984112d07c"), "title" : "mastering mongoDB", "isbn" : "101" }

And inserting this document in the books collection can be done via the following:

> db.books.insert({title: 'mastering mongoDB', isbn: '101'})
WriteResult({ "nInserted" : 1 })

The result we get back from MongoDB informs us that the write succeeded and inserted one new document in the database.

Deleting this document...