Changed postgresql and postgresql_psycopg2 backends NOT to do a SELECT version() for every connection, which was ludicrous. Now the version is only retrieved if it needs to be, via a lazy loader.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@6012 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/backends/postgresql_psycopg2/base.py

@@ -64,7 +64,4 @@ class DatabaseWrapper(BaseDatabaseWrapper):
         cursor.tzinfo_factory = None
         if set_tz:
             cursor.execute("SET TIME ZONE %s", [settings.TIME_ZONE])
-        if self.ops.postgres_version is None:
-            cursor.execute("SELECT version()")
-            self.ops.postgres_version = [int(val) for val in cursor.fetchone()[0].split()[1].split('.')]
         return cursor