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Beego/orm/docs/zh/Object.md
2013-08-19 22:37:53 +08:00

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对象的CRUD操作

对 object 操作简单的三个方法 Read / Insert / Update / Delete

o := orm.NewOrm()
user := new(User)
user.Name = "slene"

fmt.Println(o.Insert(user))

user.Name = "Your"
fmt.Println(o.Update(user))
fmt.Println(o.Read(user))
fmt.Println(o.Delete(user))

Read

o := orm.NewOrm()
user := User{Id: 1}

err = o.Read(&user)

if err == sql.ErrNoRows {
	fmt.Println("查询不到")
} else if err == orm.ErrMissPK {
	fmt.Println("找不到主键")
} else {
	fmt.Println(user.Id, user.Name)
}

Insert

o := orm.NewOrm()
var user User
user.Name = "slene"
user.IsActive = true

fmt.Println(o.Insert(&user))
fmt.Println(user.Id)

创建后会自动对 auto 的 field 赋值

Update

o := orm.NewOrm()
user := User{Id: 1}
if o.Read(&user) == nil {
	user.Name = "MyName"
	o.Update(&user)
}

Delete

o := orm.NewOrm()
o.Delete(&User{Id: 1})

Delete 操作会对反向关系进行操作,此例中 Post 拥有一个到 User 的外键。删除 User 的时候。如果 on_delete 设置为默认的级联操作,将删除对应的 Post

删除以后会清除 auto field 的值