add support for ranges to bdb/simple

lib/bdb/simple.rb

@@ -31,20 +31,32 @@ class Bdb::Simple
   end
 
   def [](key)    
-    key = Marshal.dump(key)
+    if key.kind_of?(Range)
-    
-    if dup?
       values = []
       cursor = db.cursor(nil, 0)
-      data = cursor.get(key, nil, Bdb::DB_SET)
+      k,v = cursor.get(Marshal.dump(key.first), nil, Bdb::DB_SET_RANGE)
-      while data
+      while k and key.include?(Marshal.load(k))
-        values << Marshal.load(data[1])
+        values << Marshal.load(v)
-        data = cursor.get(nil, nil, Bdb::DB_NEXT_DUP)
+        k, v = cursor.get(nil, nil, Bdb::DB_NEXT)
       end
       cursor.close
       values
     else
-      Marshal.load(db.get(nil, key, nil, 0))
+      key = Marshal.dump(key)
+      if dup?
+        values = []
+        cursor = db.cursor(nil, 0)
+        k,v = cursor.get(key, nil, Bdb::DB_SET)
+        while data
+          values << Marshal.load(v)
+          k,v = cursor.get(nil, nil, Bdb::DB_NEXT_DUP)
+        end
+        cursor.close
+        values
+      else
+        v = db.get(nil, key, nil, 0)
+        Marshal.load(v) if v
+      end
     end
   end