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Display databases in MongoDB
To display number of databases in MongoDB, you need to create atleast one document in a database.
Let’s say, you have created a database, but did not added any document in it. Then in the list of databases that particular database won’t be visible.
Following is the query to create a database −
> use app; switched to db app
Following is the query to display all databases −
> show dbs;
This will produce the following output. The new database “app” won’t be visible since we haven’t added atleast one document in it −
admin 0.002GB business 0.000GB config 0.000GB local 0.000GB main 0.000GB my 0.001GB sample 0.003GB sampleDemo 0.000GB studentSearch 0.000GB test 0.022GB university 0.000GB web 0.001GB webcustomertracker 0.000GB
Let us first create a collection with documents in the “app” database −
> db.demo.insert({"StudentName":"Chris"});
WriteResult({ "nInserted" : 1 })Following is the query to display all documents from a collection with the help of find() method −
> db.demo.find();
This will produce the following output −
{ "_id" : ObjectId("5e07250e25ddae1f53b62204"), "StudentName" : "Chris" }Here is the query to display all the databases in MongoDB −
> show dbs;
This will produce the following output. Now the “app” database will be visible in the list of databases −
admin 0.002GB app 0.000GB business 0.000GB config 0.000GB local 0.000GB main 0.000GB my 0.001GB sample 0.003GB sampleDemo 0.000GB studentSearch 0.000GB test 0.022GB university 0.000GB web 0.001GB webcustomertracker 0.000GB
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