Index: Doctrine/DBAL/Driver/OCI8/OCI8Connection.php
===================================================================
--- Doctrine/DBAL/Driver/OCI8/OCI8Connection.php        (revision 104)
+++ Doctrine/DBAL/Driver/OCI8/OCI8Connection.php        (working copy)
@@ -102,7 +102,17 @@

     public function errorInfo()
     {
-        return oci_error($this->_dbh);
+        if ($this->_dbh)
+            $err = oci_error($this->_dbh);
+        else
+            $err = oci_error();
+        if (is_array($err)) {
+            return $err['message'];
+        } elseif (is_string($err)) {
+            return $err;
+        } else {
+            return;
+        }
     }

-}
\ No newline at end of file
+}