X-Git-Url: http://git.kpe.io/?a=blobdiff_plain;f=base%2Fdb-interface.lisp;h=9a91a6902c2ebebe3357d9a102fa5ac7d551d637;hb=f2a0eb003af406415567c9f8545455ede786db87;hp=d874a7f67dfa15249b46bd7eae2e1368d061ea70;hpb=a4097e19c5157e87b9991549bc44f3ef598aeb90;p=clsql.git

diff --git a/base/db-interface.lisp b/base/db-interface.lisp
index d874a7f..9a91a69 100644
--- a/base/db-interface.lisp
+++ b/base/db-interface.lisp
@@ -206,13 +206,54 @@ the given lisp type and parameters."))
 
 ;;; Database backend capabilities
 
-(defgeneric db-use-column-on-drop-index? (database)
+(defgeneric database-underlying-type (database)
   (:method (database)
-	   (declare (ignore database))
-	   ;; Standard SQL does not use column name on DROP INDEX
-	   nil)
-  (:documentation "NIL [default] lif database does not use column name on DROP INDEX."))
+    (database-type database))
+  (:documentation "Returns the type of the underlying database. For ODBC, needs to query ODBC driver."))
 
+(defgeneric db-type-use-column-on-drop-index? (db-type)
+  (:method (db-type)
+	   (declare (ignore db-type))
+	   nil)
+  (:documentation "NIL [default] if database-type does not use column name on DROP INDEX."))
+
+(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-fancy-math? (db-type)
+  (:method (db-type)
+	   (declare (ignore db-type))
+	   nil)
+  (:documentation "NIL [default] if database-type does not have fancy math."))
+
+(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))
+	   ;; SQL99 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."))
 
 ;;; Large objects support (Marc Battyani)