fix transaction timing in generative make.

Author: dimitri-yatsenko

datajoint/autopopulate.py

@@ -336,9 +336,9 @@ def _populate1(
                     fetched_data, ignore_iterable_order=False
                 )[fetched_data]
                 computed_result = next(gen)  # perform the computation
-                gen = make(dict(key), **(make_kwargs or {}))  # restart make
                 # fetch and insert inside a transaction
                 self.connection.start_transaction()
+                gen = make(dict(key), **(make_kwargs or {}))  # restart make
                 fetched_data = next(gen)
                 if (
                     fetch_hash

datajoint/connection.py

@@ -349,7 +349,7 @@ def query(
         except errors.LostConnectionError:
             if not reconnect:
                 raise
-            logger.warning("MySQL server has gone away. Reconnecting to the server.")
+            logger.warning("Reconnecting to MySQL server.")
             connect_host_hook(self)
             if self._in_transaction:
                 self.cancel_transaction()