blob 取出的数据长度总是86，怎么办？

<resultMap class="com.shensu.business.epi.orm.po.Interlog" id="abatorgenerated_InterlogResult">
    <!--
      WARNING - This element is automatically generated by Abator for iBATIS, do not modify.
      This element was generated on Sun May 20 18:08:13 CST 2007.
    -->
    <result column="STATIONCODE" property="stationCode" jdbcType="CHAR"/>
    <result column="TIME" property="time" jdbcType="TIMESTAMP"/>
    <result column="SORT" property="sort" jdbcType="CHAR"/>
  <result column="ZIP" property="zip"  jdbcType="BLOB" javaType="[B"  typeHandler="org.springframework.orm.ibatis.support.BlobByteArrayTypeHandler"/> 
</resultMap>

我用的jdbc是ojdbc14.jar， 还要怎么配置呢？