diff --git a/src/dodb.cl b/src/dodb.cl
index a6e38d1..0914bbb 100755
--- a/src/dodb.cl
+++ b/src/dodb.cl
@@ -1,7 +1,4 @@
-#!/usr/local/bin/clisp
-
-;(load "~/.quicklisp/setup.lisp")
-;(ql:quickload "osicat")
+(ql:quickload "osicat")
 
 (load "./util.cl")
 (defpackage :dodb
@@ -15,14 +12,17 @@
 (in-package dodb)
 
 ;(defun ln (path &key target hard)
-;  (format t "SYMLINK: ~A -> ~A~&" path target))
-;  ; (osicat:make-link symlink-path
-;  ;   :target (concatenate 'string "../../data/" file-name)
-;  ;   :hard nil))
+;  (format t "LN: ~A -> ~A~&" path target))
+;(defun ls (path)
+;  (format t "LS: ~A~&" path target))
+  ; (osicat:make-link symlink-path
+  ;   :target (concatenate 'string "../../data/" file-name)
+  ;   :hard nil))
 
-;(defmacro alias (to fn)
-;  `(setf (fdefinition ',to) #',fn))
-;(alias ln osicat:make-link)
+(defmacro alias (to fn)
+  `(setf (fdefinition ',to) #',fn))
+(alias ln osicat:make-link)
+(alias ls osicat:list-directory)
 
 ; TODO: equivalent in Crystal
 ; cars = DODB::DataBase(Car).new "./storage"
@@ -41,7 +41,10 @@
 ; index = 1-1
 ; partition = 1-n
 ;             String      Path [String]     [String]        Int
-(defstruct db struct-name path (indexes ()) (partitions ()) (current-index 0))
+(defstruct db struct-name path (indexes ()) (partitions ()) (current-index 0)
+; {Int -> struct}
+  (data (make-hash-table))
+  )
 
 (defun db/new (struct-name path)
   (ensure-directories-exist (concatenate 'string path "/data/"))
@@ -72,14 +75,21 @@
       (concatenate 'string (db-struct-name database) "-" attribute-name)))
     object))
 
-; Returns "Corvet".
+; Example: returns "storage/cars/indexes/by_name/".
+(defun db/index/get-directory-path (database name)
+  (concatenate 'string (db-path database) "/indexes/by_" name "/" ))
+
+; Example: returns "storage/cars/partitions/by_color/".
+(defun db/partition/get-directory-path (database name value)
+  (concatenate 'string (db-path database) "/partitions/by_" name "/" value "/"))
+
+; Example: returns "Corvet".
 (defun db/index/get-filename (database index-name object)
   (get-object-attribute database index-name object))
 
 (defun db/index/get-symlink-path (database index-name object)
   (concatenate 'string
-    (db-path database)
-    "/indexes/by_" index-name "/"
+    (db/index/get-directory-path database index-name)
     (db/index/get-filename database index-name object)))
 
 (defun db/index/new (database index-name object file-name)
@@ -92,15 +102,12 @@
       :hard nil)
   ))
 
-; Returns "Red".
-(defun db/partition/get-filename (database partition-name object)
-  (get-object-attribute database partition-name object))
-
 (defun db/partition/get-symlink-path (database partition-name object file-name)
   (concatenate 'string
-    (db-path database)
-    "/partitions/by_" partition-name "/"
-    (db/partition/get-filename database partition-name object) "/"
+    (db/partition/get-directory-path database partition-name
+      ; example: "Red"
+      (get-object-attribute database partition-name object))
+    ; example: "000000000000018.data"
     file-name
     ))
 
@@ -135,24 +142,46 @@
     (loop for index in (db-indexes database)
        do (db/index/new database index object file-name))
 
-    ; TODO: handle partitions
+    ; handle partitions
     (loop for partition in (db-partitions database)
        do (db/partition/new database partition object file-name))
     )
+
+    ; store new in-memory data
+    (setf (gethash (db-current-index database) (db-data database)) object)
   )
 
 ; test structure
 (defstruct vehicle name color)
 
-; TODO
-(setf cars (db/new "vehicle" "./storage/cars/"))
+(defparameter cars (db/new "vehicle" "./storage/cars/"))
 
 (db/new-index cars "name")
 (db/new-partition cars "color")
 
 (db/add cars (make-vehicle :name "Corvet" :color "Red"))
+(db/add cars (make-vehicle :name "Deudeuch" :color "Beige"))
+
 (format t "~&~S~&" cars)
 
+(defun db/get-by-index (database index-name value)
+  ; (format t "db/get-by-index ~A => ~A" index-name value)
+  ; TODO: should we search for the data from the FS or in-memory?
+  ; (ls (db/index/get-directory-path database index-name))
+  (util:read-object-from-file (concatenate 'string
+    (db/index/get-directory-path database index-name) "/" value)))
+
+(defun db/get-by-partition (database name value)
+  ; (format t "db/get-by-partition ~A => ~A" name value)
+  ;(ls (db/partition/get-directory-path database name value)))
+  (loop for car in (ls (db/partition/get-directory-path database name value))
+        collect (util:read-object-from-file car)))
+
+(format t "db/get-by-index ~S~&" (db/get-by-index cars "name" "Corvet"))
+(format t "db/get-by-partition red cars:~&")
+(loop for car in (db/get-by-partition cars "color" "Red")
+      do (format t "- ~S~&" car))
+
 ; (setf cars_by_name (db/new-index cars "name"))
 ; (db/get-by-index cars "name" "foo"))
 ; (setf cars_by_name (db/new-index cars "name" (optional: (lambda (x) (vehicle-name x)))))