conversion.go

package main

import (
    "errors"
    "fmt"
    "github.com/lunny/xorm"
    _ "github.com/mattn/go-sqlite3"
    "os"
)

type Status struct {
    Name  string
    Color string
}

var (
    Registed Status            = Status{"Registed", "white"}
    Approved Status            = Status{"Approved", "green"}
    Removed  Status            = Status{"Removed", "red"}
    Statuses map[string]Status = map[string]Status{
        Registed.Name: Registed,
        Approved.Name: Approved,
        Removed.Name:  Removed,
    }
)

func (s *Status) FromDB(bytes []byte) error {
    if r, ok := Statuses[string(bytes)]; ok {
        *s = r
        return nil
    } else {
        return errors.New("no this data")
    }
}

func (s *Status) ToDB() ([]byte, error) {
    return []byte(s.Name), nil
}

type User struct {
    Id     int64
    Name   string
    Status Status `xorm:"varchar(40)"`
}

func main() {
    f := "conversion.db"
    os.Remove(f)

    Orm, err := NewEngine("sqlite3", f)
    if err != nil {
        fmt.Println(err)
        return
    }
    Orm.ShowSQL = true
    err = Orm.CreateTables(&User{})
    if err != nil {
        fmt.Println(err)
        return
    }

    _, err = Orm.Insert(&User{1, "xlw", Registed})
    if err != nil {
        fmt.Println(err)
        return
    }

    users := make([]User, 0)
    err = Orm.Find(&users)
    if err != nil {
        fmt.Println(err)
        return
    }

    fmt.Println(users)
}