--- a/cubicweb/server/sqlutils.py	Tue Mar 15 14:59:24 2016 +0100
+++ b/cubicweb/server/sqlutils.py	Fri Mar 04 12:17:58 2016 +0100
@@ -97,7 +97,8 @@
         try:
             # some dbapi modules doesn't accept unicode for sql string
             execute(str(sql))
-        except Exception:
+        except Exception as ex:
+            print(ex, file=sys.stderr)
             if cnx:
                 cnx.rollback()
             failed.append(sql)