(sql:def-view-class vehicle
(standard-db-object standard-kb-object)
((vehicle_no :db-kind :key)
(keeper)
(owner :db-kind :join
:db-info (:home-key :keeper
:foreign-key person_id
:retrieval :deferred
:join-class person))))
defines a database class
vehicle
where the
person
object in the
keeper
slot is retrieved from the
person
table in the database using the value of the
keeper
slot as key, only when queried. In the list of superclasses, standard-kb-object should appear after
sql:standard-db-object
.
KnowledgeWorks and Prolog User Guide (Windows version) - 6 Dec 2011