User Dao

package com.evs.objava33.class19;

import java.util.List;

public interface UserDao {

public String ALL_USER = "SELECT userid, username, userpass FROM user";
public String VALIDATE_USER = ALL_USER + " WHERE username=? and userpass=?";
public String ADD_USER = "INSERT INTO user (username, userpass) values (?,?)";

public User validateUser(String name, String pass);

public List<User> allUsers();

public boolean addUser(String username, String userpass);

public void deleteUser(String userid);

public boolean updateUser(String userid, String username, String userpass);

public User getUser(String userid);
}