对springdata jpa 的 @Query和select的理解

package com.yanshu.sso.dao;import com.yanshu.sso.pojo.User;import org.springframework.data.jpa.repository.JpaRepository;import org.springframework.data.jpa.repository.Query;import org.springframework.data.repository.Repository;import org.springframework.data.repository.query.Param;import java.util.List;public interface UserDao extends JpaRepository<User,Integer> {    User findOne(Integer integer);    User findByPwd(String pwd);    User findByName(String name);    User findByNameAndPwd(String name,String pwd);    @Query("SELECT U FROM User U ")    User selectXuanze();    /**     * select u.name ,u.statues from User u where u.name=?1 and u.pwd=?2     * 不能用实体传参，只能用list传参     * @param name     * @param pwd     * @return     */     @Query("select u.name ,u.statues from User u where u.name=?1 and u.pwd=?2 ")     List<User> selectstatuc(String name, String pwd);    @Query("SELECT U.name,U.statues FROM User U WHERE U.name=?1 AND U.pwd=?2")    void  selectname(String name,String pwd);}