If the OCI library is not available, raise an exception indicating as much. Closes #3593.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@3486 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activerecord/CHANGELOG

 *SVN*
 
+* If the OCI library is not available, raise an exception indicating as much. #3593 [schoenm@earthlink.net]
+
 * Add explicit :order in finder tests as postgresql orders results differently by default. #3577. [Rick Olson]
 
 * Make dynamic finders honor additional passed in :conditions. #3569 [Oleg Pudeyev <pudeyo@rpi.edu>, Marcel Molina Jr.]

activerecord/lib/active_record/connection_adapters/oci_adapter.rb

@@ -598,4 +598,12 @@ def exec(sql, *bindvars)
 
 rescue LoadError
   # OCI8 driver is unavailable.
+  module ActiveRecord # :nodoc:
+    class Base # :nodoc:
+      def self.oci_connection(config) # :nodoc:
+        # Set up a reasonable error message
+        raise LoadError, "Oracle/OCI libraries could not be loaded."
+      end
+    end
+  end
 end