用关键字ON DUPLICATE KEY UPDATE
<insert id="saveOrUpdate" useGeneratedKeys="true" keyProperty="id">
insert into ta_user_auto_config (open_id ,auto_config_key ,auto_config_val) values(#{id},#{config_key},#{config_val})
on duplicate key update config_val = values(config_val)
</insert>
后续有时间详细描叙一下