Indexes (draft).

src/dodb.cl

@@ -1,7 +1,7 @@
 #!/usr/local/bin/clisp
 
-; (load "~/.quicklisp/setup.lisp")
-; (ql:quickload "osicat")
+(load "~/.quicklisp/setup.lisp")
+(ql:quickload "osicat")
 
 (load "./util.cl")
 (defpackage :dodb
@@ -45,15 +45,41 @@
   ; Add this new index to the list.
   (push attribute-name (db-indexes database)))
 
+(defun to-upper-case (some-string)
+  (format nil "~@:(~a~)" some-string))
+
+; Returns "Corvet".
+(defun db/index/get-filename (database index-name object)
+  (funcall ; example: call function "VEHICLE-NAME"
+    (find-symbol (to-upper-case
+      (concatenate 'string (db-struct-name database) "-" index-name)))
+    object))
+
+(defun db/add/new-link (database index-name object file-name)
+  (let ((symlink-path
+      (concatenate 'string
+        (db-path database)
+        "/by_" index-name "/"
+        (db/index/get-filename database index-name object))))
+
+    ; Works even when the database directory is moved.
+    (osicat:make-link symlink-path
+      :target (concatenate 'string "../data/" file-name)
+      :hard nil)
+  ))
+
 (defun db/add (database object)
-; (osicat:make-link "lien-symbolique" :target "data.dat" :hard nil)
   (incf (db-current-index database))
-  (util:write-object-to-file object (concatenate 'string
-      (db-path database)
-      "/data/"
-      (format nil "~15,'0D.data" (db-current-index database))))
-  ; TODO: handle indexes
-  ; TODO: handle partitions
+  (let ((file-name (format nil "~15,'0D.data" (db-current-index database))))
+    (util:write-object-to-file object (concatenate 'string
+        (db-path database) "/data/" file-name))
+
+    ; TODO: handle indexes
+    (loop for index in (db-indexes database)
+       do (db/add/new-link database index object file-name))
+
+    ; TODO: handle partitions
+    )
   )
 
 ; test structure