spring security 配置问题

[beijixuem]

<authentication-provider>
<password-encoder hash="md5"/><jdbc-user-service data-source-ref="dataSource"
users-by-username-query="select username, Lower(password), 1 as enabled from V_SUMMARIZE_USER u where u.username =?"
authorities-by-username-query="select username, authority from V_SUMMARIZE_USER u where u.username = ?" />
</authentication-provider>


这里配置完后，加密的密码是小写的，但是我数据库中都是大写字母，请问这里如何配置将其也变为大写？谢谢！