Go后端开发：入门指南与实战案例

package main

import (
    "fmt"
    "net/http"
)

func main() {
    // 定义一个处理请求的函数
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        fmt.Fprintf(w, "Hello, Go!")
    })

    // 启动 HTTP 服务器
    http.ListenAndServe(":8080", nil)
}

package main

import (
    "fmt"
    "time"

    "github.com/jinzhu/gorm"
    _ "github.com/jinzhu/gorm/dialects/mysql"
)

type User struct {
    ID        uint       `gorm:"primary_key"`
    Username  string     `gorm:"size:255;not null"`
    Password  string     `gorm:"size:255;not null"`
    CreatedAt time.Time  `gorm:"default:current_timestamp"`
    UpdatedAt time.Time  `gorm:"default:current_timestamp"`
    DeletedAt *time.Time `sql:"index"`
}

func main() {
    // 连接到 MySQL 数据库
    db, err := gorm.Open("mysql", "root:root@tcp(127.0.0.1:3306)/go_dev")
    if err != nil {
        panic(err)
    }
    defer db.Close()

    // 自动迁移 User 模型
    db.AutoMigrate(&User{})

    // 创建一个新用户
    user := User{Username: "testuser", Password: "password"}
    db.Create(&user)

    // 按 ID 查询用户
    var queriedUser User
    if err := db.First(&queriedUser, user.ID).Error; err != nil {
        panic(err)
    }

    // 打印查询到的用户名
    fmt.Println(queriedUser.Username)
}