mybatis的一个奇怪问题！！

第一种写法：取出数据为2条。对的。<resultMap id="accountResult" type="account">
        <association property="addressList" column="userid" select="selectAddress"/>
    </resultMap>
    <select id="getAccountByUserid" parameterType="int" resultMap="accountResult">
        SELECT * FROM ACCOUNT WHERE USERID = #{userid}
    </select>
    <select id="selectAddress" parameterType="int" resultType="address">
        SELECT * FROM ADDRESS WHERE USERID = #{userid}
    </select>

第二种写法：取出数据为3条。错了。<resultMap id="accountResult" type="account">
<result property="userid" column="userid" />
<result property="username" column="username"/>
<result property="password" column="password"/>
<result property="createtime" column="createtime"/>
<result property="description" column="description"/>
<result property="release" column="release"/>
<collection property="addressList"
column="userid"
resultMap="addressResult"
ofType = "example.scz.usually.dto.Address"
select="selectAddress"/>
</resultMap>
<resultMap id="addressResult" type="address">
<result property="id" column="id" />
<result property="userid" column="userid"/>
<result property="address" column="address"/>
<result property="name" column="name"/>
</resultMap>

    <select id="getAccountByUserid" parameterType="int" resultMap="accountResult">
        SELECT * FROM ACCOUNT WHERE USERID = #{userid}
    </select>
    <select id="selectAddress" parameterType="int" resultType="address">
        SELECT * FROM ADDRESS WHERE USERID = #{userid}
    </select>

我想知道第二种写法错在哪里了，为什么？希望高人能帮我指点迷津，先谢谢了！ --------------------编程问答-------------------- 没人回答，沉底了，现在csdn这么没有人气啊！ --------------------编程问答-------------------- 自己顶！找有缘人

补充：Java ,  Web 开发