From ab20754db71e55b79b9e71e36ad86d9befc89a92 Mon Sep 17 00:00:00 2001
From: Gregory Haynes <greg@greghaynes.net>
Date: Thu, 12 Feb 2015 17:51:39 -0800
Subject: [PATCH] Fix PyMySQL reference error detection

When PyMySQL experiences a constraing error a unicode string prefix is
prepended part way through the inner_exception string. As a result, we
raise a DBError when we should be raising a DBReferenceError.

Change-Id: I5de1333d933bd28ca535852f4643df2ebbc7f964
---
 oslo_db/sqlalchemy/exc_filters.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/oslo_db/sqlalchemy/exc_filters.py b/oslo_db/sqlalchemy/exc_filters.py
index 5df1eb74..777fda63 100644
--- a/oslo_db/sqlalchemy/exc_filters.py
+++ b/oslo_db/sqlalchemy/exc_filters.py
@@ -192,7 +192,7 @@ def _sqlite_dupe_key_error(integrity_error, match, engine_name, is_disconnect):
          "is not present in table "
          "\"(?P<key_table>[^\"]+)\".")
 @filters("mysql", sqla_exc.IntegrityError,
-         r".* 'Cannot add or update a child row: "
+         r".* u?'Cannot add or update a child row: "
          'a foreign key constraint fails \([`"].+[`"]\.[`"](?P<table>.+)[`"], '
          'CONSTRAINT [`"](?P<constraint>.+)[`"] FOREIGN KEY '
          '\([`"](?P<key>.+)[`"]\) REFERENCES [`"](?P<key_table>.+)[`"] ')