select count(1) from SYS_USER a where del_flag = 0 and user_name = #{userName} select * from SYS_USER a where del_flag = 0 and user_name = #{userName} limit 1 UPDATE SYS_USER SET password = #{password}, changepass_date = now(), update_by = #{userName}, update_time = now() WHERE del_flag = 0 and user_name = #{userName}