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Update an existing document in MongoDB
Answer:
In an given collection, if you want to perform update on an existing document, the easiest way is to use the following commands.
employee = db.employees.findOne( { name : "Peter" } );
employee.position = "Project Manager";
db.employees.save( employee );Done.
Remove a document in a collection in MongoDB
Answer:
If you want to remove a document in the test collection, with a key "name" equal to "Peter", you can execute the following command in the MongoDB Interactive Shell.
db.test.remove( { name : "Peter" } )
Done.
Drop a collection in MongoDB
Answer:
To drop a collection in MongoDB, enter the interactive shell, and type:
db.foo.drop()
If you want to remove all the objects only, not dropping the collection, try
db.foo.remove()
Insert a new document to MongoDB
Answer:
To insert a new document to MongoDB, try the following statement in the shell,
# db.test.save({ "foo" : "bar"});
So you have saved a key-value pair in the test document.
Displays all the databases on MongoDB
Answer:
To display all the active databases on a MongoDB server, type
show dbs
To use it, like MySQL, try
use test
(Assume you need to use the test db)
