golang学习笔记16 beego orm 数据库操作
beego ORM 是一个强大的 Go 语言 ORM 框架。她的灵感主要来自 Django ORM 和 SQLAlchemy。
目前该框架仍处于开发阶段，可能发生任何导致不兼容的改动。
官方文档：https://beego.me/docs/mvc/model/overview.md
已支持数据库驱动：
- MySQL：github.com/go-sql-driver/mysql
- PostgreSQL：github.com/lib/pq
- Sqlite3：github.com/mattn/go-sqlite3
以上数据库驱动均通过基本测试，但我们仍需要您的反馈。
ORM 特性：
- 支持 Go 的所有类型存储
- 轻松上手，采用简单的 CRUD 风格
- 自动 Join 关联表
- 跨数据库兼容查询
- 允许直接使用 SQL 查询／映射
- 严格完整的测试保证 ORM 的稳定与健壮
更多特性请在文档中自行品读。
安装 ORM：
go get github.com/astaxie/beego/orm
简单示例：
package main
import (
"fmt"
"github.com/astaxie/beego/orm"
_ "github.com/go-sql-driver/mysql" // import your used driver
)
// Model Struct
type User struct {
Id int
Name string `orm:"size(100)"`
}
func init() {
// set default database
orm.RegisterDataBase("default", "mysql", "username:password@tcp(127.0.0.1:3306)/db_name?charset=utf8", 30)
// register model
orm.RegisterModel(new(User))
// create table
orm.RunSyncdb("default", false, true)
}
func main() {
o := orm.NewOrm()
user := User{Name: "slene"}
// insert
id, err := o.Insert(&user)
fmt.Printf("ID: %d, ERR: %v\n", id, err)
// update
user.Name = "astaxie"
num, err := o.Update(&user)
fmt.Printf("NUM: %d, ERR: %v\n", num, err)
// read one
u := User{Id: user.Id}
err = o.Read(&u)
fmt.Printf("ERR: %v\n", err)
// delete
num, err = o.Delete(&u)
fmt.Printf("NUM: %d, ERR: %v\n", num, err)
}关联查询
type Post struct {
Id int `orm:"auto"`
Title string `orm:"size(100)"`
User *User `orm:"rel(fk)"`
}
var posts []*Post
qs := o.QueryTable("post")
num, err := qs.Filter("User__Name", "slene").All(&posts)SQL 查询
当您无法使用 ORM 来达到您的需求时，也可以直接使用 SQL 来完成查询／映射操作。
var maps []orm.Params
num, err := o.Raw("SELECT * FROM user").Values(&maps)
for _,term := range maps{
fmt.Println(term["id"],":",term["name"])
}事务处理
o.Begin()
...
user := User{Name: "slene"}
id, err := o.Insert(&user)
if err == nil {
o.Commit()
} else {
o.Rollback()
}在开发环境下，您可以使用以下指令来开启查询调试模式：
func main() {
orm.Debug = true
...
开启后将会输出所有查询语句，包括执行、准备、事务等。
例如：
[ORM] - 2013-08-09 13:18:16 - [Queries/default] - [ db.Exec / 0.4ms] - [INSERT INTO `user` (`name`) VALUES (?)] - `slene` ...注意：我们不建议您在部署产品后这样做。
实战例子：
model部分
// UpdateUser updates User by Id and returns error if
// the record to be updated doesn't exist
func UpdateUserById(m *User) (err error) {
o := orm.NewOrm()
v := User{Id: m.Id}
// ascertain id exists in the database
if err = o.Read(&v); err == nil {
var num int64
if num, err = o.Update(m); err == nil {
fmt.Println("Number of records updated in database:", num)
}
}
return
}
// GetUserByEmailOrMobileAndPassword
func GetUserByEmailOrMobileAndPassword(email string, password string) (maps []orm.Params, err error) {
//orm.Debug = true
o := orm.NewOrm()
//var maps []orm.Params
num, err := o.Raw("select * FROM user WHERE step>0 and (email=? or mobile=?) and password=? ", email, email,password).Values(&maps)
//beego.Debug("row nums: ", num)
if err == nil && num > 0 {
return maps, nil
}
return nil, err
}
// GetUserByEmail
func GetUserByEmail(email string) (maps []orm.Params, err error) {
o := orm.NewOrm()
//var maps []orm.Params
var num int64
num, err = o.Raw("select * FROM user WHERE email=? ", email).Values(&maps)
if err == nil && num > 0 {
//fmt.Println("maps:", maps[0])
return maps, nil
}
return nil, err
}
// UpdateUser step
func UpdateUserStepById(m *User) (err error) {
//orm.Debug = true
o := orm.NewOrm()
v := User{Id: m.Id}
// ascertain id exists in the database
if err = o.Read(&v); err == nil {
var num int64
if num, err = o.Update(m,"Step", "UpdateTime"); err == nil {
fmt.Println("Number of records updated in database:", num)
}
}
return
}Control部分（maps []orm.Params 返回的map是个interface对象，需要对里面的值做强制转换才能使用）
type RegisterReq struct {
Email string
Password string
}
// @Title Register
// @Description Register User
// @Param body body controllers.RegisterReq true "body for User register"
// @Success 201 {int} models.User
// @Failure 403 body is empty
// @router /register [post]
func (c *UserController) Register() {
var v RegisterReq
if err := json.Unmarshal(c.Ctx.Input.RequestBody, &v); err == nil {
md5pwd := c.GetMd5String(v.Password + beego.AppConfig.String("MD5_SALT"))
var u models.User
u.Email = v.Email
u.Password = md5pwd
u.Step = 0
u.Status = 0
u.Level = 0
u.Role = 0
u.Nickname = strings.Split(v.Email, "@")[0]
u.CreateTime = time.Now()
u.UpdateTime = time.Now()
if _, err := models.AddUser(&u); err == nil {
//c.Ctx.Output.SetStatus(201)
c.Data["json"] = u
utils.SendmailForVerify(v.Email)
} else {
//"Error 1062: Duplicate entry 'xxx' for key 'email'"
c.Data["json"] = err.Error()
}
} else {
c.Data["json"] = err.Error()
}
c.ServeJSON()
}
type LoginReq struct {
LoginId string `description:"Email or Phone"`
Password string
}
// @Title Login
// @Description Login
// @Param body body controllers.LoginReq true "body for User login"
// @Success 201 {int} models.User
// @Failure 403 body is empty
// @router /login [post]
func (c *UserController) Login() {
var v LoginReq
if err := json.Unmarshal(c.Ctx.Input.RequestBody, &v); err == nil {
md5pwd := c.GetMd5String(v.Password + beego.AppConfig.String("MD5_SALT"))
user, _ := models.GetUserByEmailOrMobileAndPassword(v.LoginId,md5pwd)
if user != nil {
// get token uid nickname
id, _ := strconv.Atoi(user[0]["id"].(string))
nickname := user[0]["nickname"].(string)
tokenString := utils.GetToken(id, v.LoginId, nickname)
c.Data["json"] = map[string]interface{}{"success": 0, "msg": "登录成功","token":tokenString,"email":v.LoginId,"nickname":nickname,"id":id}
} else {
c.Data["json"] = map[string]interface{}{"success": -1, "msg": "账号密码不对或邮箱未验证激活"}
}
} else {
c.Data["json"] = err.Error()
}
c.ServeJSON()
}
type ChangePasswordReq struct {
OldPassword string
NewPassword string
}
// @Title Change Password
// @Description Change Password
// @Security mySecurityApiKey
// @Param body body controllers.ChangePasswordReq true "body for Change Password"
// @Success 201 {int} models.User
// @Failure 403 body is empty
// @router /change_password [put]
func (c *UserController) ChangePassword() {
email := c.GetUserMailByToken()
var v ChangePasswordReq
if err := json.Unmarshal(c.Ctx.Input.RequestBody, &v); err == nil {
md5pwd := c.GetMd5String(v.OldPassword + beego.AppConfig.String("MD5_SALT"))
user, _ := models.GetUserByEmailOrMobileAndPassword(email, md5pwd)
if user != nil {
u, _ := models.GetUserByFilter("email", email)
u.Password = c.GetMd5String(v.NewPassword + beego.AppConfig.String("MD5_SALT"))
models.UpdateUserById(u)
c.Data["json"] = Response{0, "success.", nil}
} else {
c.Data["json"] = map[string]interface{}{"success": -1, "msg": "账号密码不对"}
}
} else {
c.Data["json"] = err.Error()
}
c.ServeJSON()
}
// Put ...
// @Title Put
// @Description update the User
// @Param id path string true "The id you want to update"
// @Param body body models.User true "body for User content"
// @Success 200 {object} models.User
// @Failure 403 :id is not int
// @router /:id [put]
func (c *UserController) Put() {
idStr := c.Ctx.Input.Param(":id")
id, _ := strconv.Atoi(idStr)
v := models.User{Id: id}
if err := json.Unmarshal(c.Ctx.Input.RequestBody, &v); err == nil {
if err := models.UpdateUserById(&v); err == nil {
c.Data["json"] = "OK"
} else {
c.Data["json"] = err.Error()
}
} else {
c.Data["json"] = err.Error()
}
c.ServeJSON()
}
// @Title Get user profile
// @Description get user profile
// @Security mySecurityApiKey
// @Success 200 {object} models.User
// @router /profile [get]
func (c *UserController) Profile() {
uid := c.GetUserIdByToken()
v, err := models.GetUserById(uid)
if err != nil {
c.Data["json"] = err.Error()
} else {
c.Data["json"] = v
}
c.ServeJSON()
}
// Get Funds ...
// @Get My Funds
// @Security mySecurityApiKey
// @Description get my Funds
// @Success 200 {object} []models.Fund
// @Failure 403
// @router /funds [get]
func (c *UserController) Funds() {
uid := int(c.GetUserIdByToken())
fund, _ := models.GetAllAccountByUserId(uid)
c.Data["json"] = fund
c.ServeJSON()
}
来源：oschina
链接：https://my.oschina.net/u/4388710/blog/3923792