type ItemContent struct {
		gorm.Model
		ItemID       uint   `gorm:"not null"`
		Name         string `gorm:"not null;type:varchar(50)"`
		LanguageCode string `gorm:"not null;type:varchar(2)"`
	}
	type Item struct {
		gorm.Model
		Logo     string        `gorm:"not null;type:varchar(50)"`
		Contents []ItemContent `gorm:"foreignKey:ItemID"`
	}

	tx := DB.Session(&gorm.Session{})

		Number1 int64      `gorm:"default:NULL"`
		Number2 uint64     `gorm:"default:NULL"`
		Number3 float64    `gorm:"default:NULL"`
		Now     *time.Time `gorm:"defalut:NULL"`
		Item1Id string
		Item1   *QueryResetItem `gorm:"references:ID"`
		Item2Id string
		Item2   *QueryResetItem `gorm:"references:ID"`
	}

	DB.Migrator().DropTable(&QueryResetNullValue{}, &QueryResetItem{})