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MongoDB update documents

In MongoDB, update() method is used to update or modify the existing documents of a collection.

Syntax:

  1. db.COLLECTION_NAME.update(SELECTIOIN_CRITERIA, UPDATED_DATA)  

Example

Consider an example which has a collection name trainingtrains. Insert the following documents in collection:

  1. db.trainingtrains.insert(  
  2.    {  
  3.      course: "java",  
  4.      details: {  
  5.         duration: "6 months",  
  6.         Trainer: "Sonoo jaiswal"  
  7.      },  
  8.      Batch: [ { size: "Small", qty: 15 }, { size: "Medium", qty: 25 } ],  
  9.      category: "Programming language"  
  10.    }  
  11. )  

After successful insertion, check the documents by following query:

  1. >db.trainingtrains.find()  

Output:

{ "_id" : ObjectId("56482d3e27e53d2dbc93cef8"), "course" : "java", "details" : 
{ "duration" : "6 months", "Trainer" : "Sonoo jaiswal" }, "Batch" : 
[ {"size" : "Small", "qty" : 15 }, { "size" : "Medium", "qty" : 25 } ],
 "category" : "Programming language" }

Update the existing course "java" into "android":

  1. >db.trainingtrains.update({'course':'java'},{$set:{'course':'android'}})  

Check the updated document in the collection:

  1. >db.trainingtrains.find()  

Output:

{ "_id" : ObjectId("56482d3e27e53d2dbc93cef8"), "course" : "android", "details" : 
{ "duration" : "6 months", "Trainer" : "Sonoo jaiswal" }, "Batch" : 
[ {"size" : "Small", "qty" : 15 }, { "size" : "Medium", "qty" : 25 } ],
 "category" : "Programming language" }
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