日志是这个样子

[10:02:04.267][DEBUG][com.mmall.dao.UserMapper.checkUsername][http-bio-8088-exec-8] ==>  Preparing: select count(1) from mmall_user where username = ?
[10:02:04.301][DEBUG][com.mmall.dao.UserMapper.checkUsername][http-bio-8088-exec-8] ==> Parameters: admin(String)
[10:02:04.322][DEBUG][com.mmall.dao.UserMapper.checkUsername][http-bio-8088-exec-8] <==      Total: 1
[10:02:04.338][DEBUG][com.mmall.dao.UserMapper.selectLogin][http-bio-8088-exec-8] ==>  Preparing: SELECT id, username, password, email, phone, question, answer, role, create_time, update_time from mmall_user where username = ? and password = ?
[10:02:04.339][DEBUG][com.mmall.dao.UserMapper.selectLogin][http-bio-8088-exec-8] ==> Parameters: admin(String), 21232F297A57A5A743894A0E4A801FC3(String)
[10:02:04.339][DEBUG][com.mmall.dao.UserMapper.selectLogin][http-bio-8088-exec-8] <==      Total: 0

结果是这个样子