feat(db_api): raise exception with message for executemany() (#595)

Author: Ilya Gurov

google/cloud/spanner_dbapi/cursor.py

@@ -160,9 +160,9 @@ def _do_batch_update(self, transaction, statements, many_result_set):
         many_result_set.add_iter(res)
 
         if status.code == ABORTED:
-            raise Aborted(status.details)
+            raise Aborted(status.message)
         elif status.code != OK:
-            raise OperationalError(status.details)
+            raise OperationalError(status.message)
 
     def execute(self, sql, args=None):
         """Prepares and executes a Spanner database operation.
@@ -302,9 +302,9 @@ def executemany(self, operation, seq_of_params):
 
                         if status.code == ABORTED:
                             self.connection._transaction = None
-                            raise Aborted(status.details)
+                            raise Aborted(status.message)
                         elif status.code != OK:
-                            raise OperationalError(status.details)
+                            raise OperationalError(status.message)
                         break
                     except Aborted:
                         self.connection.retry_transaction()

tests/unit/spanner_dbapi/test_cursor.py

@@ -506,7 +506,7 @@ def test_executemany_insert_batch_failed(self):
 
         transaction = mock.Mock(committed=False, rolled_back=False)
         transaction.batch_update = mock.Mock(
-            return_value=(mock.Mock(code=UNKNOWN, details=err_details), [])
+            return_value=(mock.Mock(code=UNKNOWN, message=err_details), [])
         )
 
         with mock.patch(