mybatis 处理 mysql 表中的 text类型的 字段

在mysql 中 text类型的字段： service_detail text NULL 服务描述   。 对应java文件中 model 中的 String：  private String serviceDetail;

在 mybatis 中的xml 中定义的是 ：

<resultMap id="ResultMapWithBLOBs" type="com.eachonline.goods.model.ServiceGoodsBase" extends="BaseResultMap" >
　　<result column="service_detail" property="serviceDetail" jdbcType="LONGVARCHAR" />
</resultMap>

基本表的定义：

 <resultMap id="BaseResultMap" type="com.goods.model.ServiceGoodsBase" >
    <id column="sid" property="sid" jdbcType="VARCHAR" />
    <result column="service_name" property="serviceName" jdbcType="VARCHAR" />
    <result column="service_district" property="serviceDistrict" jdbcType="VARCHAR" />
    <result column="longitude" property="longitude" jdbcType="VARCHAR" />
    <result column="latitude" property="latitude" jdbcType="VARCHAR" />
    <result column="address" property="address" jdbcType="VARCHAR" />
    <result column="service_fee" property="serviceFee" jdbcType="DOUBLE" />
    <result column="service_price" property="servicePrice" jdbcType="DOUBLE" />
    <result column="service_unit" property="serviceUnit" jdbcType="VARCHAR" />
    <result column="user_service_type_id" property="userServiceTypeId" jdbcType="VARCHAR" />
    <result column="service_type" property="serviceType" jdbcType="VARCHAR" />
    <result column="release_time" property="releaseTime" jdbcType="VARCHAR" />
    <result column="create_time" property="createTime" jdbcType="TIMESTAMP" />

 </resultMap>

 <sql id="Base_Column_List" >
    sid, service_name, service_district, longitude, latitude, address, service_fee, service_price, 
    service_unit, user_service_type_id, service_type, release_time, create_time, is_use, 
    module, check_status, check_comment, click_num, discount, service_status, service_sale_num, 
    data_source, commodity_type
  </sql>
  <sql id="Blob_Column_List" >
    service_detail
  </sql>

  <select id="selectByPrimaryKey" resultMap="ResultMapWithBLOBs" parameterType="java.lang.String" >
    select 
    <include refid="Base_Column_List" />
    ,
    <include refid="Blob_Column_List" />
    from service_goods_base
    where sid = #{sid,jdbcType=VARCHAR}
  </select>

对于修改的操作，有两个方法： updateByPrimaryKeySelective  ， updateByPrimaryKeyWithBLOBs