Summary of golang framework code examples

These code examples demonstrate the uses of the Go framework, including building web applications (Gin), managing APIs (Echo), working with distributed systems (Consul), using event-driven communication (NATS), and managing with an ORM (GORM) database.

Go Framework Code Example: Build Powerful Web and Cloud Native Applications

Introduction## The #Go language is known for its efficiency, concurrency and cross-platform capabilities, making it useful for building web and cloud-native applications. This article compiles code examples for various Go frameworks, covering everything from web development to API management and distributed systems.

1. Web Framework

Gin: A high-performance, lightweight Web framework:

func main() {
    r := gin.Default()

    r.GET("/users/:name", func(c *gin.Context) {
        name := c.Param("name")
        c.JSON(200, gin.H{
            "name": name,
            "message": "Hello " + name,
        })
    })

    r.Run()
}

2. API management framework

Echo: A high-performance, minimalist RESTful API framework:

func main() {
    e := echo.New()

    e.GET("/users/:id", func(c echo.Context) error {
        id := c.Param("id")
        return c.JSON(http.StatusOK, map[string]interface{}{
            "id":   id,
            "name": "John Doe",
        })
    })

    e.Logger.Fatal(e.Start(":1323"))
}

3. Distributed system Framework

Consul: A lightweight, high-performance distributed service discovery and configuration management framework:

// 创建一个 Consul 客户机
client, err := consul.NewClient(consul.DefaultConfig())
if err != nil {
    log.Fatal(err)
}

// 注册一个服务
err = client.Agent().ServiceRegister(&consul.AgentServiceRegistration{
    ID:      "user-service",
    Name:    "user-service",
    Port:    8000,
    Address: "127.0.0.1",
})
if err != nil {
    log.Fatal(err)
}

4. Event-driven framework

NATS: A high-performance, message-driven communication platform:

// 创建一个 NATS 连接
conn, err := nats.Connect("nats://127.0.0.1:4222")
if err != nil {
    log.Fatal(err)
}

// 创建一个发布者
publisher, err := conn.PublishAsync("orders", nil)
if err != nil {
    log.Fatal(err)
}

// 发送消息
publisher.Msg.Data = []byte("Hello World")
publisher.Publish()

// 创建一个订阅者
subscriber, err := conn.Subscribe("orders", func(m *nats.Msg) {
    log.Println("Received a message:", string(m.Data))
})
if err != nil {
    log.Fatal(err)
}

5. Database framework

GORM: An easy and efficient ORM (Object Relational Mapping) framework:

import (
    "fmt"

    "gorm.io/driver/mysql"
    "gorm.io/gorm"
)

// 创建一个 GORM 句柄
db, err := gorm.Open(mysql.Open("user:password@tcp(127.0.0.1:3306)/database"), &gorm.Config{})
if err != nil {
    log.Fatal(err)
}

// 创建一个 User 模型
type User struct {
    ID    uint    `gorm:"primary_key"`
    Name  string  `gorm:"not null"`
    Email string  `gorm:"unique;not null"`
    Age   int     `gorm:"not null"`
    Active bool    `gorm:"default:false"`
    JoinedAt time.Time `gorm:"autoCreateTime"`
}

// 执行查询并查看结果
results := db.Model(&User{}).Where("name = ?", "John").Find(&users)
if results.Error != nil {
    log.Fatal(results.Error)
}
fmt.Println(users)

ConclusionThese code examples highlight the breadth and functionality of the Go framework, Go is proven to be an excellent choice for building robust, efficient, and scalable web and cloud-native applications.

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