hql 语句中 := 的意义

 这是一种基于别名的查询 username = ：username  ， ：的作用是用于声明后面的字是别名   

	/**
	 * 检查用户是否存在
	 * */
	public TSUser getUserByUserIdAndUserNameExits(TSUser user) {
		String password = PasswordUtil.encrypt(user.getUserName(), user.getPassword(), PasswordUtil.getStaticSalt());
		String query = "from TSUser u where u.userName = :username and u.password=:passowrd";
		Query queryObject = getSession().createQuery(query);
		queryObject.setParameter("username", user.getUserName());
		queryObject.setParameter("passowrd", password);
		List users = queryObject.list();
		if (users != null && users.size() > 0) {
			return users.get(0);
		}
		return null;
	}