<parameterMap class="User" id="insertUser-param">
  	<parameter property="username"/>
  	<parameter property="password"/>
  </parameterMap>

  <insert id="insertUser" parameterMap="insertUser-param">
  	insert into t_user values (
  		null,?,?
  	)
  	<selectKey resultClass="int" keyProperty="id">
  		SELECT @@IDENTITY AS ID
  	</selectKey>  	
  </insert>

User user = new User();
		user.setUsername("张三dd");
		user.setPassword("dd");
		
		Object obj  = sqlMapper.insert("insertUser", user);