diff --git a/lib/sqlite_extension.rb b/lib/sqlite_extension.rb
index 743475a..ce63bb2 100644
--- a/lib/sqlite_extension.rb
+++ b/lib/sqlite_extension.rb
@@ -30,11 +30,15 @@ if ActiveRecord::Base.connection.adapter_name =~ /^sqlite$/i
     func.set_result(Math.sqrt(value))
   end
 
-#  database.create_function('dist', 5, :numeric) do |func, lat1, long1, lat2, long2, radius|
-#    lat2, long2 = [lat2, long2].map{|l|l * Math::PI/180.0}
-#    func.set_result = radius * Math.acos([1,
-#      Math.cos(lat1.to_f) * Math.cos(long1.to_f) * Math.cos(lat2.to_f) * Math.cos(long2.to_f) + 
-#      Math.cos(lat1.to_f) * Math.sin(long1.to_f) * Math.cos(lat2.to_f) * Math.sin(long2.to_f) + 
-#      Math.sin(lat1.to_f) * Math.sin(lat2.to_f)].min)
-#  end
+  database.create_function('spheric_distance', 5, :real) do |func, lat1, long1, lat2, long2, radius|
+    func.set_result(
+      radius.to_f * Math.acos(
+	[1,
+        Math.cos(lat1.to_f) * Math.cos(long1.to_f) * Math.cos(lat2.to_f) * Math.cos(long2.to_f) + 
+         Math.cos(lat1.to_f) * Math.sin(long1.to_f) * Math.cos(lat2.to_f) * Math.sin(long2.to_f) + 
+         Math.sin(lat1.to_f) * Math.sin(lat2.to_f)
+        ].min
+      )
+    )
+  end
 end
diff --git a/script/extract_sies_data.rb b/script/extract_sies_data.rb
index 03d6896..a74c46b 100644
--- a/script/extract_sies_data.rb
+++ b/script/extract_sies_data.rb
@@ -1,3 +1,5 @@
+#!/usr/bin/ruby
+
 $LOAD_PATH.unshift('/usr/share/rails/activerecord/lib')
 $LOAD_PATH.unshift('/usr/share/rails/activesupport/lib')
 
@@ -6,13 +8,8 @@ require 'active_support'
 
 LIMIT = 5
 
-ActiveRecord::Base.establish_connection(
-  :adapter => 'mysql',
-  :host => 'localhost',
-  :database => 'farejador',
-  :username => 'root',
-  :password => 'root'
-)
+# To connect with the database that contains the data to be extracted cofigure it in the 'database_farejador.yml' with the name 'farejador'
+ActiveRecord::Base.establish_connection(YAML::load(IO.read('database_farejador.yml'))['farejador'])
 
 class Enterprise < ActiveRecord::Base
   set_table_name 'cons_dadosbasicos'
diff --git a/test/unit/sqlite_extension_test.rb b/test/unit/sqlite_extension_test.rb
index 958067a..9dc3363 100644
--- a/test/unit/sqlite_extension_test.rb
+++ b/test/unit/sqlite_extension_test.rb
@@ -32,8 +32,9 @@ class SQliteExtensionTest < Test::Unit::TestCase
     assert_in_delta 1.4142, ActiveRecord::Base.connection.execute('select sqrt(2) as sqrt').first['sqrt'], 0.0001
   end
 
-#  should 'have a distance function' do
-#    assert_in_delta 2.28402, ActiveRecord::Base.connection.execute('select dist(32.918593, -96.958444, 32.895155, -96.958444, 3963.19) as dist').first['dist'], 0.0001
-#  end
+  should 'have a distance function' do
+    args = [32.918593, -96.958444, 32.951613, -96.958444].map{|l|l * Math::PI/180}
+    assert_in_delta 2.28402, ActiveRecord::Base.connection.execute("select spheric_distance(#{args.inspect[1..-2]}, 3963.19) as dist").first['dist'], 0.0001
+  end
 
 end
--
libgit2 0.21.2