品优购day14注册帐号异常信息解决Duplicate entry 'zhangsan' for key 'username'

品优购day14注册帐号异常信息解决Duplicate entry 'zhangsan' for key 'username'

异常信息

java.lang.RuntimeException: org.springframework.dao.DuplicateKeyException: 
### Error updating database.  Cause: ptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry 'zhangsan' for key 'username'
### The error may involve com.pinyougou.mapper.TbUserMapper.insert-Inline
### The error occurred while setting parameters
### SQL: insert into tb_user (id, username, password,        phone, email, created,        updated, source_type, nick_name,        name, status, head_pic,        qq, account_balance, is_mobile_check,        is_email_check, sex, user_level,        points, experience_value, birthday,        last_login_time)     values (?, ?, ?,        ?, ?, ?,        ?, ?, ?,        ?, ?, ?,        ?, ?, ?,        ?, ?, ?,        ?, ?, ?,        ?)
### Cause: ptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry 'zhangsan' for key 'username'
; SQL []; Duplicate entry 'zhangsan' for key 'username'; nested exception ptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry 'zhangsan' for key 'username'
org.springframework.dao.DuplicateKeyException: 
### Error updating database.  Cause: ptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry 'zhangsan' for key 'username'
### The error may involve com.pinyougou.mapper.TbUserMapper.insert-Inline
### The error occurred while setting parameters
### SQL: insert into tb_user (id, username, password,        phone, email, created,        updated, source_type, nick_name,        name, status, head_pic,        qq, account_balance, is_mobile_check,        is_email_check, sex, user_level,        points, experience_value, birthday,        last_login_time)     values (?, ?, ?,        ?, ?, ?,        ?, ?, ?,        ?, ?, ?,        ?, ?, ?,        ?, ?, ?,        ?, ?, ?,        ?)
### Cause: ptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry 'zhangsan' for key 'username'
; SQL []; Duplicate entry 'zhangsan' for key 'username'; nested exception sql.jdbc.