diff --git a/lib/Doctrine/Connection/Sqlite.php b/lib/Doctrine/Connection/Sqlite.php
index 2e81479bb..b3e8e8342 100644
--- a/lib/Doctrine/Connection/Sqlite.php
+++ b/lib/Doctrine/Connection/Sqlite.php
@@ -74,6 +74,13 @@ class Doctrine_Connection_Sqlite extends Doctrine_Connection_Common
         $this->options['server_version'] = '';
         */
         parent::__construct($manager, $adapter);
+
+        if ($this->isConnected) {
+            $this->dbh->sqliteCreateFunction('mod',    array('Doctrine_Expression_Sqlite', 'modImpl'), 2);
+            $this->dbh->sqliteCreateFunction('concat', array('Doctrine_Expression_Sqlite', 'concatImpl'));
+            $this->dbh->sqliteCreateFunction('md5', 'md5', 1);
+            $this->dbh->sqliteCreateFunction('now', 'time', 0);
+        }
     }
     /**
      * initializes database functions missing in sqlite
@@ -83,6 +90,10 @@ class Doctrine_Connection_Sqlite extends Doctrine_Connection_Common
      */
     public function connect() 
     {
+        if ($this->isConnected) {
+            return false;
+        }
+
         parent::connect();
 
         $this->dbh->sqliteCreateFunction('mod',    array('Doctrine_Expression_Sqlite', 'modImpl'), 2);