MongoDB FindOne on collection

MongoDB FindOne on collection

create application directory

go mod init github.com/freedomtutorials/mongodbfindone

import mongodb-drivers

go get go.mongodb.org/mongo-driver

Connect to MongoDB, with below code

    // set the mongodb uri 
    clientOptions := options.Client().ApplyURI("mongodb://127.0.0.1:27017")
	
    //connect to mongodb
    client, err := mongo.Connect(context.TODO(), clientOptions)

    if err != nil {
        log.Fatal(err)
    }

    err = client.Ping(context.TODO(), nil)

    if err != nil {
        log.Fatal(err)
    }

    fmt.Println("Connected to MongoDB!")

    freedomtutorialsDB := client.Database("freedomtutorials")
    mydataCollection := freedomtutorialsDB.Collection("mydata")

FindOne document on collection

    var device Device
    if err = mydataCollection.FindOne( context.TODO(), bson.M{}).Decode(&device); err != nil {
        log.Fatal(err)
    }
    fmt.Println(device)

output:

{1 Name}

FindOne document on collection with filter

    if err = mydataCollection.FindOne( context.TODO(), bson.M{"id":1}).Decode(&device); err != nil {
        log.Fatal(err)
    }
    fmt.Println(device)