r9009: add sequence fns

[clsql.git] / db-aodbc / aodbc-sql.lisp

diff --git a/db-aodbc/aodbc-sql.lisp b/db-aodbc/aodbc-sql.lisp
index 24a6e47ea34b2fd3d403d0c60e5fd49c98696fb6..4cd8a6e28cc9bffe07607b3861a68e1d65538a41 100644 (file)
--- a/db-aodbc/aodbc-sql.lisp
+++ b/db-aodbc/aodbc-sql.lisp
@@ -144,6 +144,90 @@
              (setf (car rest) elem))
        list))))
 
+;;; Sequence functions
+
+(defun %sequence-name-to-table (sequence-name)
+  (concatenate 'string "_clsql_seq_" (sql-escape sequence-name)))
+
+(defun %table-name-to-sequence-name (table-name)
+  (and (>= (length table-name) 11)
+       (string= (subseq table-name 0 11) "_clsql_seq_")
+       (subseq table-name 11)))
+
+(defmethod database-create-sequence (sequence-name
+                                    (database aodbc-database))
+  (let ((table-name (%sequence-name-to-table sequence-name)))
+    (database-execute-command
+     (concatenate 'string "CREATE TABLE " table-name
+                 " (last_value int NOT NULL PRIMARY KEY, increment_by int, min_value int, is_called char(1))")
+     database)
+    (database-execute-command 
+     (concatenate 'string "INSERT INTO " table-name
+                 " VALUES (1,1,1,'f')")
+     database)))
+
+(defmethod database-drop-sequence (sequence-name
+                                  (database aodbc-database))
+  (database-execute-command
+   (concatenate 'string "DROP TABLE " (%sequence-name-to-table sequence-name)) 
+   database))
+
+(defmethod database-list-sequences ((database aodbc-database)
+                                    &key (owner nil))
+  (declare (ignore owner))
+  (mapcar #'(lambda (s) (%table-name-to-sequence-name (car s)))
+          (database-query "SHOW TABLES LIKE '%clsql_seq%'" 
+                          database nil)))
+
+(defmethod database-set-sequence-position (sequence-name
+                                           (position integer)
+                                           (database aodbc-database))
+  (database-execute-command
+   (format nil "UPDATE ~A SET last-value=~A" 
+          (%sequence-name-to-table sequence-name)
+           position)
+   database)
+  position)
+
+(defmethod database-sequence-next (sequence-name (database aodbc-database))
+  (without-interrupts
+   (let* ((table-name (%sequence-name-to-table sequence-name))
+         (tuple
+          (car (database-query 
+                (concatenate 'string "SELECT last_value,is_called FROM " 
+                             table-name)
+                database
+                :auto))))
+     (cond
+       ((char-equal (schar (second tuple) 0) #\f)
+       (database-execute-command
+        (format nil "UPDATE ~A SET is_called='t'" table-name)
+        database)
+       (car tuple))
+       (t
+       (let ((new-pos (1+ (car tuple))))
+        (database-execute-command
+         (format nil "UPDATE ~A SET last_value=~D" table-name new-pos)
+         database)
+        new-pos))))))
+            
+(defmethod database-sequence-last (sequence-name (database aodbc-database))
+  (without-interrupts
+   (caar (database-query 
+         (concatenate 'string "SELECT last_value FROM " 
+                      (%sequence-name-to-table sequence-name))
+         database
+         :auto))))
+
+(defmethod database-create (connection-spec (type (eql :aodbc)))
+  (warn "Not implemented."))
+
+(defmethod database-destroy (connection-spec (type (eql :aodbc)))
+  (warn "Not implemented."))
+
+(defmethod database-probe (connection-spec (type (eql :aodbc)))
+  (warn "Not implemented."))
+
 #+ignore                      
 (when (clsql-base-sys:database-type-library-loaded :aodbc)
   (clsql-base-sys:initialize-database-type :database-type :aodbc))