magento迁移后后台无法登录解决方法

执行以下查询即可：

SET FOREIGN_KEY_CHECKS = 0 ;
UPDATE `core_store` SET store_id = 0 WHERE code = 'admin';
UPDATE `core_store_group` SET group_id = 0 WHERE name = 'Default';
UPDATE `core_website` SET website_id = 0 WHERE code = 'admin' ;
UPDATE `customer_group` SET customer_group_id = 0 WHERE customer_group_code = 'NOT LOGGED IN';
SET FOREIGN_KEY_CHECKS = 1 ;