对数据库进行两次查询？

[isfong]

`@Override
public String login(String username, String password) {
UsernamePasswordAuthenticationToken upToken = new UsernamePasswordAuthenticationToken(username, password);
// Perform the security
final Authentication authentication = authenticationManager.authenticate(upToken);
SecurityContextHolder.getContext().setAuthentication(authentication);

    // Reload password post-security so we can generate token
    final UserDetails userDetails = userDetailsService.loadUserByUsername(username);
    final String token = jwtTokenUtil.generateToken(userDetails);
    return token;
}`

这个方法会对数据库进行两次用户数据的查询？是不是没有必要啊？