mongodb_go_driver_atlas_connect_and_find_document.go

1package main
2
3import (
4	"context"
5	"encoding/json"
6	"fmt"
7	"log"
8	"os"
9
10	"github.com/joho/godotenv"
11	"go.mongodb.org/mongo-driver/bson"
12	"go.mongodb.org/mongo-driver/mongo"
13	"go.mongodb.org/mongo-driver/mongo/options"
14)
15
16func main() {
17	if err := godotenv.Load(); err != nil {
18		log.Println("No .env file found")
19	}
20
21	uri := os.Getenv("MONGODB_URI")
22	if uri == "" {
23		log.Fatal("You must set your 'MONGODB_URI' environment variable. See\n\t https://www.mongodb.com/docs/drivers/go/current/usage-examples/#environment-variable")
24	}
25
26	client, err := mongo.Connect(context.TODO(), options.Client().ApplyURI(uri))
27	if err != nil {
28		panic(err)
29	}
30
31	defer func() {
32		if err := client.Disconnect(context.TODO()); err != nil {
33			panic(err)
34		}
35	}()
36
37	coll := client.Database("sample_mflix").Collection("movies")
38	title := "Back to the Future"
39
40	var result bson.M
41	err = coll.FindOne(context.TODO(), bson.D{{"title", title}}).Decode(&result)
42	if err == mongo.ErrNoDocuments {
43		fmt.Printf("No document was found with the title %s\n", title)
44		return
45	}
46	if err != nil {
47		panic(err)
48	}
49
50	jsonData, err := json.MarshalIndent(result, "", "    ")
51	if err != nil {
52		panic(err)
53	}
54
55	fmt.Printf("%s\n", jsonData)
56}