+--------------------------+---------------------------------+
| Variable_name
+--------------------------+---------------------------------+
| character_set_client
| character_set_connection | utf8
| character_set_database
| character_set_filesystem | binary
| character_set_results
| character_set_server
| character_set_system
| character_sets_dir
+--------------------------+---------------------------------+
则数据库的默认字符集为utf-8.
SET NAMES 'utf8';