Updating Fields of document in MongoDB

• 
  
  MongoDB provides 4 key methods to update the document in the collection those are
  
  

  sno	Method	Description
  1	update()	Either updates or replaces a single document that match a specified filter or updates all documents that match a specified filter.
  2	updateMany()	Update all documents that match a specified filter.
  3	updateOne()	Updates at most a single document that match a specified filter even though multiple documents may match the specified filter.
  4	replaceOne()	Replaces at most a single document that match a specified filter even though multiple documents may match the specified filter.

  NOTE:
  1. All the methods will have the same signature except method names and its return concept.
  2. Means except of update() method other methods will acknowledge response with objectId.
  3. So I am mentioning update() syntax
  4. Please refer Update Operators section in this tutorial for better understanding.
  5. Please refer WildCard/RegEx section in this tutorial for better understanding.
  
  Syntax:

  db.collection.update(
  <query>, <update statement>,
  {upsert:<boolean>,
   multi: <boolean>,
   writeConcern: <document>
   })

  NOTE:
  
  1. Upsert:true will creates a new document when no document matches the query criteria.
  2. If we don’t use Field update operators ($set,$inc..) update statement will be replaced with matched ones.

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