mybatis 批量更新问题

  <update id="batchUpdate" parameterType="java.util.List">
        <foreach collection="list" separator=";" item="item">
           UPDATE t_warn
			SET END_TIME = #{item.endTime,jdbcType=TIMESTAMP}
			WHERE
				DATA_ARRAY_INDEX = #{item.dataArrayIndex,jdbcType=INTEGER} 
				 AND ISNULL(END_TIME)
			ORDER BY
				CREATE_DT DESC
			LIMIT 1 
        </foreach>
     </update>