CODEWITHSUNDEEP
mongodbmongo-shell
markdsievers
markdsievers

Reputation: 7309

Specify which database to use in mongodb .js script

I just want to run a .js script against a particular mongodb database, but can't seem to get the correct syntax.

echo "print(db.address.find().limit(1));" > test.js
mongo test.js

How do I select the database that this will be executed on, I've tried various combinations of use foo with no success.

> show dbs                      
admin   (empty)
local   (empty)
foo 0.203125GB
bar 0.203125GB

I would like to use foo in this case.

Upvotes: 25

Views: 18845

Answers (2)

idrositis
idrositis

Reputation: 1376

You can use the db.getSiblingDB() method, as mentioned here and in the MongoDB documentation.

// Equivalent for "use <db>" command in mongo shell
db = db.getSiblingDB('foo')

This is particularly useful when writing scripts using the mongo shell where the use helper is not available. Or when you cannot refer to the DB on the connection string.

Upvotes: 12

Chris Barretto
Chris Barretto

Reputation: 9529

mongo <name of db> --eval "db.runCommand( <js in here> );"

Or if you dont have a specific runCommand script, you can just do:

mongo <name of db> --eval "<js in here>;"

If you are using a return value:

mongo <name of db> --eval "db.eval('return fnName()')"

For a file

mongo <name of db> some_instructions.js

Upvotes: 31

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