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- db.getSiblingDB()
db.getSiblingDB()¶
Definition¶
- db.getSiblingDB(<database>)¶
Parameter Type Description database string The name of a MongoDB database. 返回: A database object. Used to return another database without modifying the db variable in the shell environment.
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.)