diff --git a/lib/Doctrine/Connection.php b/lib/Doctrine/Connection.php
index 1252bc6dd..884640da0 100644
--- a/lib/Doctrine/Connection.php
+++ b/lib/Doctrine/Connection.php
@@ -203,6 +203,25 @@ abstract class Doctrine_Connection extends Doctrine_Configurable implements Coun
         }
         return $text;
     }
+    /**
+     * convertBoolean
+     * some drivers need the boolean values to be converted into integers
+     * when using DQL API
+     *
+     * This method takes care of that conversion
+     *
+     * @param array $item
+     * @return void
+     */
+    public function convertBooleans(array $items)
+    {
+        foreach ($items as $k => $item) {
+            if (is_bool($item)) {
+                $items[$k] = (int) $item;
+            }
+        }
+        return $items;
+    }
     /**
      * Quote a string so it can be safely used as a table or column name
      *
diff --git a/lib/Doctrine/Expression.php b/lib/Doctrine/Expression.php
index d0e7c0a7b..5899768c3 100644
--- a/lib/Doctrine/Expression.php
+++ b/lib/Doctrine/Expression.php
@@ -272,7 +272,7 @@ class Doctrine_Expression extends Doctrine_Connection_Module
     public function concat($args)
     {
         $cols = $this->getIdentifiers($args);
-        return 'CONCAT(' . join(', ', $cols) . ')';
+        return 'CONCAT(' . join(', ', (array) $cols) . ')';
     }
     /**
      * Returns the SQL for a logical not.