example

type User struct {
	Id        uint64         `db:"id,primarykey,autoincrement"`
	Name      string         `db:"name"`
	Age       sql.NullInt64  `db:"age"`
	Rate      float64        `db:"rate,default=0"`
	CreatedAt time.Time      `db:"created_at"`
	UpdatedAt mysql.NullTime `db:"updated_at"`
}

type UserItem struct {
	Id           uint64         `db:"id,primarykey,autoincrement"`
	UserId       uint64         `db:"user_id"`
	ItemId       string         `db:"item_id"`
	IsUsed       bool           `db:"is_used"`
	HasExtension sql.NullBool   `db:"has_extension"`
	UsedAt       mysql.NullTime `db:"used_at"`
}