+(defgeneric db-type-has-views? (db-type)
+ (:method (db-type)
+ (declare (ignore db-type))
+ ;; SQL92 has views
+ t)
+ (:documentation "T [default] if database-type supports views."))
+
+(defgeneric db-type-has-subqueries? (db-type)
+ (:method (db-type)
+ (declare (ignore db-type))
+ t)
+ (:documentation "T [default] if database-type supports views."))
+
+(defgeneric db-type-has-boolean-where? (db-type)
+ (:method (db-type)
+ (declare (ignore db-type))
+ ;; SQL92 has boolean where
+ t)
+ (:documentation "T [default] if database-type supports boolean WHERE clause, such as 'WHERE MARRIED'."))
+
+(defgeneric db-backend-has-create/destroy-db? (db-type)
+ (:method (db-type)
+ (declare (ignore db-type))
+ t)
+ (:documentation "T [default] if backend can destroy and create databases."))
+
+(defgeneric db-type-transaction-capable? (db database)
+ (:method (db database)
+ (declare (ignore db database))
+ t)
+ (:documentation "T [default] if database can supports transactions."))