package guestbook const DateFormat = "2006-01-02 15:04:05" type Guestbook interface { Entries(page, pageSize int64) ([]*Entry, error) Count() (int64, error) NewEntry(entry *Entry) error UpdateEntry(entry *Entry) (*Entry, error) DeleteEntry(entryID int64) error NewReply(reply *Reply) error UpdateReply(reply *Reply) (*Entry, error) DeleteReply(entryID int64) error Close() error }