Summary of golang framework code examples-Golang-php.cn

Summary of golang framework code examples

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Release： 2024-06-03 12:23:57

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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.

Summary of golang framework code examples

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()
}

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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"))
}

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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)
}

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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)
}

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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)

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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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