Go语言中GORM存取数组/自定义类型数据

type Strs []string

func (m *Strs) Scan(val interface{}) error {
	s := val.([]uint8)
	ss := strings.Split(string(s), "|")
	*m = ss
	return nil
}

func (m Strs) Value() (driver.Value, error) {
	str := strings.Join(m, "|")
	return str, nil
}

type User struct {
	ID   uint `gorm:"primary_key"`
	Name string
	Pics Strs `gorm:"type:longtext"`  // 自定义的数组类型，在数据库中存为长文本类型
}

func SaveUser(user User) error {
	var err error
	err = db.Save(&user).Error
	return err
}

func GetUser(name string) (User, error) {
	var user User
	err := db.First(&user, "name = ?", name).Error
	return user, err
}

func TestSaveUser() {
   user := User{
      Name: "Jason",
      Pics: Strs{
         "123124",
         "gtsrbxrzsfcv",
      },
   }
   err := SaveUser(user)
   if err != nil {
      log.Panicln("保存失败！", err)
   } else {
      log.Println("保存成功！")
   }
}

func TestGetUser() {
   user, err := GetUser("Jason")
   if err != nil {
      log.Panicln("获取失败！", err)
   } else {
      log.Println("获取成功！", user)
   }
}

mysql> select *from users;
+----+-------+---------------------+
| id | name  | pics                |
+----+-------+---------------------+
|  3 | Jason | 123124|gtsrbxrzsfcv |
+----+-------+---------------------+
1 row in set (0.00 sec)

type User struct {
   ID    uint `gorm:"primary_key"`
   Name  string
   Cards Card `gorm:"json"`
}

type Card struct {  // 指定json的Tag。
   Type     int    `json:"type"`
   Account  string `json:"account"`
   Password string `json:"password"`
}

// Scan 解码json字符串
func (card *Card) Scan(val interface{}) error {
   b, _ := val.([]byte)
   return json.Unmarshal(b, card)
}

// Value 编码json
func (card Card) Value() (value driver.Value, err error) {
	return json.Marshal(card)
}

type User struct {
   ID    uint `gorm:"primary_key"`
   Name  string
   Cards Card `gorm:"json"`  // 指定为json类型
}