写出使用beego操作mysql数据库实现增删改查的代码

好的，以下是使用beego操作mysql数据库实现增删改查的示例代码：

package controllers

import (
    "github.com/astaxie/beego"
    "github.com/astaxie/beego/orm"
    _ "github.com/go-sql-driver/mysql"
)

type UserController struct {
    beego.Controller
}

type User struct {
    Id   int
    Name string
    Age  int
}

func init() {
    orm.RegisterDriver("mysql", orm.DRMySQL)
    orm.RegisterDataBase("default", "mysql", "root:password@tcp(127.0.0.1:3306)/test?charset=utf8")
    orm.RegisterModel(new(User))
    orm.RunSyncdb("default", false, true)
}

func (c *UserController) AddUser() {
    o := orm.NewOrm()
    user := User{Name: "Tom", Age: 20}
    id, err := o.Insert(&user)
    if err == nil {
        c.Ctx.WriteString("Insert user success, id: " + string(id))
    } else {
        c.Ctx.WriteString("Insert user failed, err: " + err.Error())
    }
}

func (c *UserController) GetUser() {
    o := orm.NewOrm()
    user := User{Id: 1}
    err := o.Read(&user)
    if err == nil {
        c.Ctx.WriteString("Get user success, name: " + user.Name + ", age: " + string(user.Age))
    } else {
        c.Ctx.WriteString("Get user failed, err: " + err.Error())
    }
}

func (c *UserController) UpdateUser() {
    o := orm.NewOrm()
    user := User{Id: 1}
    if o.Read(&user) == nil {
        user.Age = 22
        if num, err := o.Update(&user); err == nil {
            c.Ctx.WriteString("Update user success, num: " + string(num))
        } else {
            c.Ctx.WriteString("Update user failed, err: " + err.Error())
        }
    }
}

func (c *UserController) DeleteUser() {
    o := orm.NewOrm()
    user := User{Id: 1}
    if num, err := o.Delete(&user); err == nil {
        c.Ctx.WriteString("Delete user success, num: " + string(num))
    } else {
        c.Ctx.WriteString("Delete user failed, err: " + err.Error())
    }
}

这段代码演示了如何使用beego的ORM模块连接mysql数据库，并实现增删改查操作。其中，init函数用于注册数据库驱动和连接数据库；AddUser函数用于新增用户；GetUser函数用于查询用户；UpdateUser函数用于更新用户；DeleteUser函数用于删除用户。