1.首先dao層mapper.java需要繼承原來的接口

　　原dao層接口

public interface TagMapper {
    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table t_tag
     *
     * @mbg.generated
     */
    long countByExample(TagExample example);

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table t_tag
     *
     * @mbg.generated
     
 
*/
    int deleteByExample(TagExample example);
}

　　擴展後的dao層接口

public interface TagExtendMapper extends TagMapper {
    ...
}

2.繼承原始mapper.xml的結果映射

　　原始mapper.xml的結果映射

<mapper namespace="com.dreamcloudprint.dao.mapper.TagMapper">
  <resultMap id="BaseResultMap" type="com.dreamcloudprint.dao.Tag"
 
>
    <!--
      WARNING - @mbg.generated
      This element is automatically generated by MyBatis Generator, do not modify.
    -->
    <id column="id" jdbcType="CHAR" property="id" />
    <result column="tag_name" jdbcType="VARCHAR" property="tagName" />
    <result column
 
="tag_alias" jdbcType="VARCHAR" property="tagAlias" />
  </resultMap>
</mapper>

　　擴展mapper.xml的結果映射

<mapper namespace="com.dreamcloudprint.dao.TagExtendMapper">
    <select id="xxxxx" resultMap="com.dreamcloudprint.dao.mapper.TagMapper.BaseResultMap"> <!-- 這裏時原始命名空間加上結果集id -->
    </select>
</mapper>

　　或者是

<mapper namespace="com.dreamcloudprint.dao.TagExtendMapper">
   <resultMap id="ExtBaseResultMap" type="com.dreamcloudprint.dao.Tag" extend="com.dreamcloudprint.dao.mapper.TagMapper.BaseResultMap">
       ...
  </resultMap>
</mapper>

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Mybatis的XML映射文件的繼承問題