X-Git-Url: http://git.kpe.io/?a=blobdiff_plain;f=base%2Fdb-interface.lisp;h=3b84d95bd7e19badc6048e7ec726150ff8e13558;hb=f716bb1161cf9e89a96945c4a444244f9d303691;hp=d257a5fa3342c70616f117e4eefb23dd33c16c98;hpb=db9892632e6eb7869aea7a94c16b523a82de1501;p=clsql.git

diff --git a/base/db-interface.lisp b/base/db-interface.lisp
index d257a5f..3b84d95 100644
--- a/base/db-interface.lisp
+++ b/base/db-interface.lisp
@@ -30,13 +30,6 @@
    "The internal generic implementation for checking if
 database type library loaded successfully."))
 
-(defgeneric database-type (database)
-  (:documentation
-   "Returns database type")
-  (:method (database)
-	   (signal-no-database-error database)))
-
-
 (defgeneric database-initialize-database-type (database-type)
   (:documentation
    "The internal generic implementation of initialize-database-type."))
@@ -59,9 +52,9 @@ was called with the connection-spec."))
 	   (signal-no-database-error database))
   (:documentation "Internal generic implementation of disconnect."))
 
-(defgeneric database-query (query-expression database result-types)
-  (:method (query-expression (database t) result-types)
-	   (declare (ignore query-expression result-types))
+(defgeneric database-query (query-expression database result-types field-names)
+  (:method (query-expression (database t) result-types field-names)
+	   (declare (ignore query-expression result-types field-names))
 	   (signal-no-database-error database))
   (:documentation "Internal generic implementation of query."))
 
@@ -193,7 +186,8 @@ the given lisp type and parameters."))
   (:documentation "List all attributes in TABLE."))
 
 (defgeneric database-attribute-type (attribute table database &key owner)
-  (:documentation "Return the type of ATTRIBUTE in TABLE."))
+  (:documentation "Return the type of ATTRIBUTE in TABLE. Returns multiple values
+of TYPE_NAME (keyword) PRECISION SCALE NULLABLE."))
 
 (defgeneric database-add-attribute (table attribute database)
   (:documentation "Add the attribute to the table."))
@@ -204,6 +198,63 @@ the given lisp type and parameters."))
 (defgeneric oid (object)
   (:documentation "Return the unique ID of a database object."))
 
+;;; Database backend capabilities
+
+(defgeneric database-underlying-type (database)
+  (:method (database)
+    (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-default-case (db-type)
+  (:method (db-type)
+	   (declare (ignore db-type))
+	   ;; By default, CommonSQL converts identifiers to UPPER case. 
+	   :upper)
+  (:documentation ":upper [default] if means identifiers mapped to UPPER case SQL like CommonSQL API. However, Postgresql maps identifiers to lower case, so PostgreSQL uses a value of :lower for this result."))
+
+(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)
 
@@ -227,8 +278,8 @@ the given lisp type and parameters."))
     (signal-closed-database-error database)))
 
 (defmethod database-query :before (query-expression (database database) 
-				   result-set)
-  (declare (ignore query-expression result-set))
+				   result-set field-names)
+  (declare (ignore query-expression result-set field-names))
   (unless (is-database-open database)
     (signal-closed-database-error database)))