db.getSiblingDB()
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Definition
Example
You can use db.getSiblingDB()
as an alternative to the use
<database>
helper. This is particularly useful when writing scripts
using the mongo
shell where the use
helper is not
available. Consider the following sequence of operations:
db = db.getSiblingDB('users') db.active.count()
This operation sets the db
object to point to the database named
users
, and then returns a count of the collection named
active
. You can create multiple db
objects, that refer to
different databases, as in the following sequence of operations:
users = db.getSiblingDB('users') records = db.getSiblingDB('records') users.active.count() users.active.findOne() records.requests.count() records.requests.findOne()
This operation creates two db
objects referring to different
databases (i.e. users
and records
) and then returns a
count and an
example document from
one collection in that database (i.e. active
and requests
respectively.)