Storing Data in MongoDB with Go - 04

• First check the Go version by running the command

go version

• Create a folder

mkdir <folder_name>

• Switch to created folder

cd <folder_name>

• Initialize the go project by running the given command. You will get go.mod file.

go mod init <folder_name>

• Create a main.go file, use terminal or bash

notepad main.go 
touch main.go

• Let's write some basic code in main.go file.

package main 

import (
    "fmt"
)


func main () {
    fmt.Println("Hello From Go")
}

• Run the code by following command

go run main.go 

• You will see this output in console

Hello From Go

• Install some packages to connect MongoDB. Here are commands

go get go.mongodb.org/mongo-driver
go get go.mongodb.org/mongo-driver/mongo

• Revisit the main.go file to connect MongoDB. Add some code to connect MongoDB. This is how it will look after adding.

package main 

// package importing
import (
    "fmt"

    "log"
    "context"

    "go.mongodb.org/mongo-driver/mongo"
    "go.mongodb.org/mongo-driver/mongo/options"
)


// mongodb connections
var collection *mongo.Collection
var ctx = context.TODO()

func init() {
    clientOptions := options.Client().ApplyURI("mongodb://localhost:27017/")
    client, err := mongo.Connect(ctx, clientOptions)
    if err != nil {
        log.Fatal(err)
    }

    // check connection
    err = client.Ping(ctx, nil)
    if err != nil {
        log.Fatal(err)
    }
    fmt.Println("Connected to MongoDB!")

    collection = client.Database("testingWithGo").Collection("movies")
}



// entry point 
func main () {
    fmt.Println("Hello From Go")
}

• Run the code by following command

go run main.go 

• You will see this output in console

Connected to MongoDB!
Hello From Go

• Till, Our MongoDB is connected. Now let's add some data. We are going to add movie data. So, let's make a movie structure.

// movie model or structure 
type Movie struct {
    ID    string `json:"id"`
    Title string `json:"title"`
}

• Now write a function to add movie to database.

// to add movie to db
func addMovie(id, title string) {

    movie := Movie{
        ID:    id,
        Title: title,
    }

    _, err := collection.InsertOne(ctx, movie)
    if err != nil {
        log.Fatal(err)
    }

    fmt.Println("Movie added successfully!")
}

• Call the addMovie function to main function.

addMovie("1", "Captain America")

• This is how our code will look like after completing above steps

package main 

// package importing
import (
    "fmt"

    "log"
    "context"

    "go.mongodb.org/mongo-driver/mongo"
    "go.mongodb.org/mongo-driver/mongo/options"
)




// mongodb connections
var collection *mongo.Collection
var ctx = context.TODO()

func init() {
    clientOptions := options.Client().ApplyURI("mongodb://localhost:27017/")
    client, err := mongo.Connect(ctx, clientOptions)
    if err != nil {
        log.Fatal(err)
    }

    // check connection
    err = client.Ping(ctx, nil)
    if err != nil {
        log.Fatal(err)
    }
    fmt.Println("Connected to MongoDB!")

    collection = client.Database("testingWithGo").Collection("movies")
}



// movie model or structure 
type Movie struct {
    ID    string `json:"id"`
    Title string `json:"title"`
}


// to add movie to db
func addMovie(id, title string) {

    movie := Movie{
        ID:    id,
        Title: title,
    }

    _, err := collection.InsertOne(ctx, movie)
    if err != nil {
        log.Fatal(err)
    }

    fmt.Println("Movie added successfully!")
}




// entry point 
func main () {
    fmt.Println("Hello From Go")

    // callig addMovie 
    addMovie("1", "Captain America")
}

• Run the code by following command

go run main.go 

• You will see this output in console

Connected to MongoDB!
Hello From Go
Movie added successfully!

• We have successfully added some data to MongoDB, you can verify in your database, which is your localhost.

mongodb://localhost:27017/

That's for this article. Thank You.