adding bind value substitution

activerecord/lib/active_record/connection_adapters/abstract_adapter.rb

@@ -97,6 +97,12 @@ module ActiveRecord
         quote_column_name(name)
       end
 
+      # Returns a bind substitution value given a +column+ and list of current
+      # +bind_values+
+      def substitute_for(column, bind_values)
+        Arel.sql '?'
+      end
+
       # REFERENTIAL INTEGRITY ====================================
 
       # Override to turn off referential integrity while executing <tt>&block</tt>.

activerecord/test/cases/adapters/sqlite3/sqlite3_adapter_test.rb

@@ -51,6 +51,15 @@ module ActiveRecord
                                        :timeout => 100
         assert_equal 'UTF-8', conn.encoding
       end
+
+      def test_bind_value_substitute
+        conn = Base.sqlite3_connection :database => ':memory:',
+                                       :adapter => 'sqlite3',
+                                       :timeout => 100
+
+        bind_param = conn.substitute_for('foo', [])
+        assert_equal Arel.sql('?'), bind_param
+      end
     end
   end
 end