これは、予定 DB の Z スキーマです。
|--AppointmentDB----------------
|attendees : P Person /** those involved in the appointment **/
|
|/** a new TYPE object to store attendees, schedule and purpose **/
|appointments : P APPOINTMENT
|hasAppointment : Person <-> APPOINTMENT
|schedule : APPOINTMENT -> DateTime
|purpose : APPOINTMENT -> Report
|
|/** a forward relation compositions to relate attendees with purpose and schedule **/
|attendeePurpose : hasAppointment;purpose
|attendeeSchedule : hasAppointment;schedule
|-----------------------------
|attendees ⊆ dom(hasAppointment)
|attendees ⊆ dom(attendeePurpose)
|appointments ⊆ ran(hasAppointment)
|-----------------------------
の名前に基づいて予定を見つける検索機能を作成したいと思いますattendees。
- 検索機能が予定オブジェクトのすべての詳細を返すようにします。
どのように設計すればよいですか？
これが私の見解です：
|--FindAppointment---------------------------------------------------
|ΞAppointmentDB
|attendees? : Person
|appointmentAttendees! : P Person
|appointmentPurpose! : Report
|appointmentSchedule! : DateTime
|-----------------------------
|/** if name of any attendees is given, then it must exist in appointments' domain
|respectively before this function can run**/
|attendees? ∈ dom(attendees)
|
|/** return the set of attendees of the same APPOINTMENT using attendees? as input **/
|appointmentAttendees! = hasAppointment~(|{attendees?}|)
|
|/** Get the image of both forward relational compositions according to set of
|attendees?**/
|appointmentPurpose! = attendeePurpose(|{attendees?}|)
|appointmentSchedule! = attendeeSchedule(|{attendees?}|)
|----------------------------------------------------------------------