public User findUserByNameAndPwd(String name,String pwd);

   	select * from t_user where name = #{0} and pwd = #{1}

public User findUserByNameAndPwd(String name,String pwd){		Map paramMap=new HashMap();		paramMap.put("name",name);		paramMap.put("pwd", pwd);		return userDao.findUserByNameAndPwd(paramMap);}

public User findUserByNameAndPwd(Map paramMap);

  		 select * from t_user where name = #{name,jdbcType=VARCHAR} and pwd=#{pwd,jdbcType=VARCHAR}	

public User findUserByNameAndPwd(@param("name")String name,@param("pwd")String pwd);

   	select * from t_user where name = #{name,jdbcType=VARCHAR} and pwd=#{pwd,jdbcType=VARCHAR}