How to integrate with golang framework?

How to persist data to MongoDB using Golang application: Create a new Golang project. Install the MongoDB driver. Connect to the MongoDB instance. Create a collection. Insert data. Query data. update data. delete data.

Golang application that persists data to MongoDB

MongoDB is a powerful non-relational database that is often used with Golang application together. This guide will show you how to persist data to MongoDB using Golang’s standard library and third-party packages.

Prerequisites

• Understanding of Golang language
• Install MongoDB and the corresponding Golang driver

Steps

1. Create a new Golang project

go mod init myapp

2. Install the MongoDB driver

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

3. Connect to the MongoDB instance

import (
    "context"
    "fmt"
    "log"

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

func main() {
    // 设置连接字符串
    connectionString := "mongodb://localhost:27017"

    // 建立连接
    client, err := mongo.Connect(context.TODO(), options.Client().ApplyURI(connectionString))
    if err != nil {
        log.Fatal(err)
    }

    // 延迟关闭连接
    defer client.Disconnect(context.TODO())

    // ...
}

4. Create a collection

// 设置待创建的集合名称
collectionName := "users"

// 获取集合对象
collection := client.Database("myDatabase").Collection(collectionName)

5. Insert data

// 创建一个文档
user := map[string]interface{}{
    "name": "John Doe",
    "age":  30,
}

// 将文档插入集合中
insertResult, err := collection.InsertOne(context.TODO(), user)
if err != nil {
    log.Fatal(err)
}

// 打印插入后的 ID
fmt.Printf("Inserted document with ID: %v\n", insertResult.InsertedID)

6. Query data

// 设置要查询的过滤器
filter := bson.D{{"name", "John Doe"}}

// 查询集合
cursor, err := collection.Find(context.TODO(), filter)
if err != nil {
    log.Fatal(err)
}

// 迭代查询结果
for cursor.Next(context.TODO()) {
    var result map[string]interface{}
    err := cursor.Decode(&result)
    if err != nil {
        log.Fatal(err)
    }

    fmt.Printf("%v\n", result["name"])
}

// 关闭游标
cursor.Close(context.TODO())

7. Update data

// 设置要更新的过滤条件
filter := bson.D{{"name", "John Doe"}}

// 设置要更新的字段和值
update := bson.D{{"$set", bson.D{{"age", 31}}}}

// 更新文档
updateResult, err := collection.UpdateOne(context.TODO(), filter, update)
if err != nil {
    log.Fatal(err)
}

// 打印修改的文档数目
fmt.Printf("%v document(s) updated\n", updateResult.ModifiedCount)

8. Delete data

// 设置要删除的过滤条件
filter := bson.D{{"name", "John Doe"}}

// 删除文档
deleteResult, err := collection.DeleteOne(context.TODO(), filter)
if err != nil {
    log.Fatal(err)
}

// 打印删除的文档数目
fmt.Printf("%v document(s) deleted\n", deleteResult.DeletedCount)

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