How do I fetch all collections in MongoDB?

How do I fetch all collections in MongoDB?

To obtain a list of MongoDB collections, we need to use the Mongo shell command show collections . This command will return all collections created within a MongoDB database.

What does find () do in MongoDB?

Find() Method. In MongoDB, find() method is used to select documents in a collection and return a cursor to the selected documents. Cursor means a pointer that points to a document, when we use find() method it returns a pointer on the selected documents and returns one by one.

How do I export a whole database from MongoDB compass?

Procedure

  1. Connect to the deployment containing the collection you wish to export data from.
  2. Navigate to your desired collection.
  3. Click Collection in the top-level menu and select Export Collection.
  4. Select document fields to include in your exported file.
  5. Choose a file type and export location.
  6. Click Export.

How do I show all records in MongoDB?

If you want to check your databases list, use the command show dbs. Your created database (mydb) is not present in list. To display database, you need to insert at least one document into it. In MongoDB default database is test.

How do I search multiple values in MongoDB?

MongoDB provides the find() that is used to find multiple values or documents from the collection. The find() method returns a cursor of the result set and prints all the documents. To find the multiple values, we can use the aggregation operations that are provided by MongoDB itself.

How do I export data from MongoDB to JSON?

mongoexport command is used to export MongoDB Collection data to a CSV or JSON file. By default, the mongoexport command connects to mongod instance running on the localhost port number 27017. Field_name(s) – Name of the Field (or multiple fields separated by comma (,) ) to be exported.

How do I import multiple collections in MongoDB?

I had a look at our MongoDB and if you turn the MongoDB Input tool into a batch macro you are able to loads in multiple collections.

  1. Place the MongoDB input on the canvas and configure it for just 1 collection.
  2. Add a control parameter and connect it to the input.
  3. Add a Macro Output and save the file.

How do I show all databases in MongoDB?

Use show dbs command from mongo shell to list all the available databases on MongoDB server. This will show the database name with there size. You can select any database using the use statement and work on it.

Which of the following command will return all items from inventory collection in MongoDB?

The Answer is A. The db. inventory. find() method with no parameter is used to return all documents from a collection and returns all fields for the documents.

What does DB collection find return?

The statement db. collection. find() returns the cursor of Result Set of a query by which you can iterate over the result set or print all documents.