控制体报出的信息，可以帮忙解释一下吗，
JDBC Connection [jdbc:mysql://127.0.0.1:3306/gold?useUnicode=true&characterEncoding=utf-8, UserName=root@localhost, MySQL Connector Java] will not be managed by Spring==> Preparing: select count(1) from user where username=?
==> Parameters: 123456(String)
