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 181c3edeee490678d82963ce2ef9a9f33c7f11cf..4cd8a6e28cc9bffe07607b3861a68e1d65538a41 100644 (file)
--- a/db-aodbc/aodbc-sql.lisp
+++ b/db-aodbc/aodbc-sql.lisp
@@ -159,11 +159,11 @@
   (let ((table-name (%sequence-name-to-table sequence-name)))
     (database-execute-command
      (concatenate 'string "CREATE TABLE " table-name
-                 " (id int NOT NULL PRIMARY KEY AUTO_INCREMENT)")
+                 " (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 (0)")
+                 " VALUES (1,1,1,'f')")
      database)))
 
 (defmethod database-drop-sequence (sequence-name
@@ -183,16 +183,41 @@
                                            (position integer)
                                            (database aodbc-database))
   (database-execute-command
-   (format nil "UPDATE ~A SET id=~A" (%sequence-name-to-table sequence-name)
+   (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))
-  (warn "Not implemented."))
-
+  (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))
-  (declare (ignore sequence-name)))
+  (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."))