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=CRUD Operations from the Mongo Shell=

The mongo shell is a Javascript command-line interface to MongoDB that can be started by running the command <code>mongo</code>:

<pre>
$ mongo
>
</pre>

Below, we cover the four basic operations of transactional databases: create, remove, update, delete (CRUD).

==Create (Insert)==

To insert documents into a collection:
* <code>db.collection.insertOne()</code>
* <code>db.collection.insertMany()</code>

Example: <code>db.users.insertOne({name:"Sue", age:26})</code>

==Read (Query)==

To read documents from a collection,
use the find function:
* <code>db.collection.find()</code>

Example: <code>db.users.find({age:{$gt:18}})</code>

==Update==

To update documents in a collection:
* <code>db.collection.updateOne()</code>
* <code>db.collection.updateMany()</code>
* <code>db.collection.replaceOne()</code>

Example: <code>db.users.updateMany( {age:{$lt:18}, $set: {status: "reject"}} )</code>

==Delete==

Delete documents one at a time or en masse:
* <code>db.collection.deleteOne()</code>
* <code>db.collection.deleteMany()</code>

[[Category:MongoDB]]
[[Category:Databases]]

Mongo/CRUD - Revision history

Admin: Created page with "=CRUD Operations from the Mongo Shell= The mongo shell is a Javascript command-line interface to MongoDB that can be started by running the command `mongo`:
..."

Mongo/CRUD - Revision history

Admin: Created page with "=CRUD Operations from the Mongo Shell= The mongo shell is a Javascript command-line interface to MongoDB that can be started by running the command mongo: ..."

Admin: Created page with "=CRUD Operations from the Mongo Shell= The mongo shell is a Javascript command-line interface to MongoDB that can be started by running the command `mongo`:
..."