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第一步：标记
type User struct {
Id int64
Name string
Version int `xorm:"version"`
}第二步：在Insert时，version标记的字段将会被设置为1
var user User
user.Name = "hehe"
engine.Insert(user)
//INSERT INTO user(name,version) values(?,?) update前需要get一下
var user User
engine.Id(1).Get(&user)
// SELECT * FROM user WHERE id = ?
engine.Id(1).Update(&user)
// UPDATE user SET ..., version = version + 1 WHERE id = ? AND version = ?