MongoDB – Page 23

How to Replace Existing Documents when Importing a File into MongoDB

January 5, 2021 by Ian

When you use mongoimport to import files into MongoDB, you have the option of replacing existing documents that match the ones you’re importing.

By this I mean, if an imported document has the same _id value as an existing one in the collection you’re importing into, the existing document will be replaced with the one being imported.

You can also specify another field (other than the _id field) to be the matching field if required.

The way to replace existing documents when using mongoimport is to use upsert mode.

Import a CSV File into MongoDB with mongoimport

January 4, 2021 by Ian

When using MongoDB, you can use mongoimport to import documents into a collection. mongoimport is a command line utility that imports content from an Extended JSON, CSV, or TSV file. The import file could have been created by mongoexport or some other export utility.

This article presents examples of importing a CSV file into MongoDB.

Import a JSON File into MongoDB with mongoimport

January 4, 2021 by Ian

This article presents examples of importing a JSON file into MongoDB.

The Import Modes of mongoimport

January 3, 2021 by Ian

When using mongoimport to import files into MongoDB, you have the option of specifying a mode to use. These modes determine what happens if there’s already matching documents in the collection that you’re trying to import into.

By default, mongoimport uses insert mode, but there are other modes you can use. The mode you use will depend on what you’re trying to do.

Below is an overview of each mode along with examples.

How to Export MongoDB Query Results to a CSV File

January 3, 2021 by Ian

The MongoDB Database Tools include a utility called mongoexport that enables you to export MongoDB data to a CSV or JSON file.

One of the things you can do with this utitlity is export query results. This article shows you how to use mongoexport to export MongoDB query results to a CSV file.

How to Export MongoDB Query Results to a JSON File

January 3, 2021 by Ian

The MongoDB Database Tools include a utility called mongoexport that enables you to export MongoDB data to a CSV or JSON file.

One of the things you can do with this utitlity is export query results. This article shows you how to use mongoexport to export MongoDB query results to a JSON file.

Export a MongoDB Collection to a JSON File

January 3, 2021 by Ian

The MongoDB Database Tools include a utility called mongoexport that enables you to export MongoDB data to a CSV or JSON file.

This article shows you how to use mongoexport to export a MongoDB collection to a JSON file.

Export a MongoDB Collection to a CSV File

January 2, 2021 by Ian

The MongoDB Database Tools include a utility called mongoexport that enables you to export MongoDB data to a CSV or JSON file.

This article shows you how to use mongoexport to export a MongoDB collection to a CSV file.

How to Convert a MongoDB View to a Collection

January 2, 2021 by Ian

If you have a view in a MongoDB database that you’d prefer to be a collection, you’re in the right place.

Below is an example of converting a view to a collection in MongoDB.

MongoDB countDocuments()

January 2, 2021 by Ian

In MongoDB the db.collection.countDocuments() method returns the count of documents that match the query for a collection or view.

The collection part is the name of the collection or view to perform the count operation on.