![]() db.collection.createIndex() : Create a new index on the collection if the index does not exist otherwise, the operation has no effect.db.leteMany() : Delete documents from the collection.db.leteOne() : Delete a single document from the collection.db.collection.updateMany() : Update multiple existing documents in the collection.When we talk about its functionality, it updates the single document, but if you pass the multi-argument, then it will update all the documents. This method can update a particular part or an entire document in the collection. db.collection.updateOne() : Update a single existing document in the collection. The MongoDB update () method updates the current document in a collection.db.collection.insertMany() : Insert multiple new documents into the collection.db.collection.insertOne() : Insert a new document into the collection.db.collection.drop() : Drops or removes the collection completely.db.createCollection() : Creates a new collection.show collections : Prints the list of collections in the current database. Javascript answers related to mongodb bulk update multiple documents mongoose bulk update insert property multiple documents mongodb merge in mongodb working with multiple db in single query mongodb mongodb group by several fields node js mongodb update nested object Update multiple documents by id set.The returned document shows that the command found and updated multiple documents. db : Displays the current database in use. The update modifies all documents that match the query specified in the q field, namely the empty query which matches all documents in the collection.show dbs : Print a list of all databases on the server.This application may be built using any technology (.NET, Java, PHP, Node, Python, etc), it doesn't matter. You can also connect your own custom application. Behind the scenes, both the Shell and Compass issues the same commands to the database server. MongoDB Compass is a GUI (Graphical User Interface) for querying, visualizing and modifying database data. We can also use it to perform administrative operations like creating databases, collections etc. When an _id field is not specified, MongoDB automatically creates a document with this _id containing an ObjectId value (as conducted by the insert() method).MongoDB Shell is an interactive JavaScript interface for querying and modifying database data. Otherwise, when it does not exist, it will create one. As the save() method is used, the document that exists will get updated. In other words, it can be said that the save() is a blend of both update() as well as insert(). ![]() $set: for creating a new document is also possible as no document goes with the query.Īs you have encountered so far the update() method which helps in updating the Mongo database values in any existing document on the other hand, the save() method is used to replace a document with another document conceded in the form of a parameter. So, now let us update the list of instrument played by this person, by making use of the $set operator for updating a single field. Select which Field Name you wish for modifying and go into the new value consequently.Then make use of the set command for modifying the Field Name. ![]() Let us assume an example where you want to update your document which is having an id 4.
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