<update id="upSerialNum" parameterType="map">
update
T_serial_record
SET
serial_num = serial_num + 1
WHERE
meeting_id = #{ meetingId }
AND serial_num <![CDATA[ >= ]]>
#{ serialNum }
AND
serial_num <![CDATA[ < ]]>
999999999
AND del_flg = '0'
</update>
标重点 <![CDATA[ < ]]>
最里面的中括号里面写防止转义的标点符号。