Better error message if deferrable is used in PG < 9.1

1 files changed, 6 insertions, 0 deletions

diff --git a/psycopg/connection_type.c b/psycopg/connection_type.c
index f3a17f9..13c017e 100644
--- a/psycopg/connection_type.c
+++ b/psycopg/connection_type.c
@@ -499,6 +499,12 @@ psyco_conn_set_transaction(connectionObject *self, PyObject *args, PyObject *kwa
         }
     }
     if (Py_None != deferrable) {
+        if (self->server_version < 90100) {
+            PyErr_SetString(ProgrammingError,
+                "the 'deferrable' setting is only available"
+                " from PostgreSQL 9.1");
+            return NULL;
+        }
         if (!(c_deferrable = _psyco_conn_parse_onoff(deferrable))) {
             return NULL;
         }