[iBatis] update문 prepend작성법

<update id="osAddressDAO.updateAddrGrpMapping" parameterClass="osAddressMap">
   UPDATE OS_ADDR_GROUP_MAPPING SET
   <dynamic prepend=" " close=" ">
      <isNotNull property="new_addr_seq" prepend=",">
         ADDR_SEQ = #new_addr_seq#
      </isNotNull>
      <isNotNull property="new_group_seq" prepend=",">
         GROUP_SEQ = #new_group_seq#
      </isNotNull>
      WHERE
         1=1
         <isNotEmpty property="addr_seqs" prepend="AND">
            ADDR_SEQ IN ($addr_seqs$)
         </isNotEmpty>
         <isNotEqual property="addr_seq" compareValue="0" prepend="AND">
            ADDR_SEQ = #addr_seq#
         </isNotEqual>
         <isNotEmpty property="group_seq" prepend="AND">
            GROUP_SEQ = #group_seq#
         </isNotEmpty>
   </dynamic>
</update>

 위 dynamic문을 안쓰면 

UPDATE OS_ADDR_GROUP_MAPPING SET ,ADDR_SEQ ~~~ 로 컴마가앞에들어가서 오류가 발생한다.

끝.