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About Bhagvan Kommadi

Bhagvan Kommadi is the Founder of Architect Corner & has around 20 years’ experience in the industry, ranging from large scale enterprise development to helping incubate software product start-ups. He has done Masters in Industrial Systems Engineering at Georgia Institute of Technology (1997) and Bachelors in Aerospace Engineering from Indian Institute of Technology, Madras (1993). He is member of IFX forum,Oracle JCP and participant in Java Community Process. He founded Quantica Computacao, the first quantum computing startup in India. Markets and Markets have positioned Quantica Computacao in ‘Emerging Companies’ section of Quantum Computing quadrants. Bhagvan has engineered and developed simulators and tools in the area of quantum technology using IBM Q, Microsoft Q# and Google QScript. He has reviewed the Manning book titled : "Machine Learning with TensorFlow”. He is also the author of Packt Publishing book - "Hands-On Data Structures and Algorithms with Go".He is member of IFX forum,Oracle JCP and participant in Java Community Process. He is member of the MIT Technology Review Global Panel.

Upsert in MongoDB

1. Introduction

This is an in-depth article on how to create MongoDB Upsert Example. Mongo Database is a no SQL database. It has capabilities such as query language to retrieve from the database. It also provides operational and administrative procedures. A document in Mongo Database is a data structure that has field and value pairs. These documents are like JSON objects. The values of fields can be other documents, arrays, and arrays of documents. Upsert operation is for updating a document. It is like update and insert together.

2. MongoDB Upsert

2.1 Prerequisites

MongoDB needs to be installed for the MongoDB Upsert example.

2.2 Download

You can download the Mongo DB from the Mongo Database website for Linux, windows, or macOS versions.

2.3 Setup

On macOS, you need to tap the formula repository of MongoDB. This repo needs to be added to the formula list. The command below adds the formula repository of MongoDB to the formula list:

Brew Tap Command
brew tap mongodb/brew

After setting the formula list, you can install the Mongo DB with the following command :

Brew Install command
brew install mongodb-community@4.0

2.4 MongoDB CommandLine

After installation, you can run MongoDB on the command line. To run MongoDB on the command line, the following command can be used:

Mongo Execution command
mongod --config /usr/local/etc/mongod.conf

The output of the executed command is shown below.

Fig.1: Mongod Command Line
Fig.1: Mongod Command Line

2.5 Mongo DB Operations

After starting the Mongod process, Mongo Shell can be invoked on the command line. Mongo shell can be run using the command below:Mongo Shell command

 mongo

The output of the executed command is shown below.

Fig.2: Mongo Shell
Fig.2: Mongo Shell

2.5.1 Database Initialization

You can use database_name to create a database. This command will create a new database. If the database exists, it will start using the existing database. The command below is used to create “octopus” database:Database creation command

 use octopus

The output of the executed command is shown below.

Fig.3: Create Database
Fig.3: Create Database

2.5.2 Drop Database

You can use the dropDatabase() command to drop the existing database. The command below is used to drop a database. This command will delete the database​. If use this command without db, then the default ‘test’ database is deleted. Delete Database command

 db.dropDatabase()

The output of the executed command is shown below.

Fig.4: Drop Database
Fig.4: Drop Database

2.5.3 Create Document

You can use createCollection command to create a set of documents. The created collection is used to create a document. The command below is used to create “persons” collection: Create Document command

 db.createCollection("persons")

The output of the executed command is shown below.

Fig.5: Create Collection
Fig.5: Create Collection

2.5.4 Upsert Document

You can use findAndModify() method to update the document into a collection. This method update the values in the specified document 

The command below is used to update the person’s document in the person’s collection if it exists. Otherwise, create a new person to be stored in the octopus database: Upsert command

 db.persons.findAndModify({
   query:{person:"john clay"},
   update:{
     $set: { "id": 002, "ssn": 323455678 }
   },
   upsert:true
   }
)

The output of the executed command is shown below.

> use octopus
switched to db octopus
> db.persons.findAndModify({
...    query:{person:"john clay"},
...    update:{
...      $set: { "id": 002, "ssn": 323455678 }
...    },
...    upsert:true
...    }
... )
{
	"_id" : ObjectId("629fadec92cc30a1b678322f"),
	"person" : "john clay",
	"id" : 2,
	"lastModified" : ISODate("2022-06-07T19:58:36.972Z"),
	"ssn" : 323455678
}
> db.persons.find().pretty()
{
	"_id" : ObjectId("629fad5e92cc30a1b6783225"),
	"name" : "john smith",
	"id" : 2,
	"lastModified" : ISODate("2022-06-07T19:56:14.065Z"),
	"ssn" : 323455678
}
{
	"_id" : ObjectId("629fad9892cc30a1b6783228"),
	"person" : "john smith",
	"id" : 2,
	"lastModified" : ISODate("2022-06-07T19:57:12.641Z"),
	"ssn" : 323455678
}
{
	"_id" : ObjectId("629fadec92cc30a1b678322f"),
	"person" : "john clay",
	"id" : 2,
	"lastModified" : ISODate("2022-06-07T19:58:36.972Z"),
	"ssn" : 323455678
}

You can also use the update method to modify only if the person exists. Below is an example of update methodUpdate Document command

db.persons.update(
   {person:"john clay"},
     {$set: { "ssn": 555555555 }},
   {upsert:true}
   
)

The output is as shown below:

> db.persons.update(
...    {person:"john clay"},
...      {$set: { "ssn": 555555555 }},
...    {upsert:true}
...    
... )
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
> db.persons.find().pretty()
{
	"_id" : ObjectId("629fad5e92cc30a1b6783225"),
	"name" : "john smith",
	"id" : 2,
	"lastModified" : ISODate("2022-06-07T19:56:14.065Z"),
	"ssn" : 323455678
}
{
	"_id" : ObjectId("629fad9892cc30a1b6783228"),
	"person" : "john smith",
	"id" : 2,
	"lastModified" : ISODate("2022-06-07T19:57:12.641Z"),
	"ssn" : 323455678
}
{
	"_id" : ObjectId("629fadec92cc30a1b678322f"),
	"person" : "john clay",
	"id" : 2,
	"lastModified" : ISODate("2022-06-07T19:58:36.972Z"),
	"ssn" : 555555555
}

You can use replaceOne() method to replace the existing document with the modified one. Below is the exampleReplace Document command

db.persons.replaceOne(
      { "person" : "john clay" },
      { "person" : "John May"}
   )

The output for the above command is shown below:

> db.persons.replaceOne(
...       { "person" : "john clay" },
...       { "person" : "John May"}
...    )
{ "acknowledged" : true, "matchedCount" : 1, "modifiedCount" : 1 }
> db.persons.find().pretty()
{
	"_id" : ObjectId("629fad5e92cc30a1b6783225"),
	"name" : "john smith",
	"id" : 2,
	"lastModified" : ISODate("2022-06-07T19:56:14.065Z"),
	"ssn" : 323455678
}
{
	"_id" : ObjectId("629fad9892cc30a1b6783228"),
	"person" : "john smith",
	"id" : 2,
	"lastModified" : ISODate("2022-06-07T19:57:12.641Z"),
	"ssn" : 323455678
}
{ "_id" : ObjectId("629fadec92cc30a1b678322f"), "person" : "John May" }

3. Download the Source Code

Download
You can download the full source code of this example here: Upsert in MongoDB

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