ttc_5.0/ttc-backen/target/classes/mapper/SnowflakeMapper.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="cn.ubitech.ttc.dao.SnowflakeMapper">

    <!-- 开启二级缓存 -->
    <cache type="org.mybatis.caches.ehcache.LoggingEhcache"/>
    <select id="getlastSnowflake" resultType="cn.ubitech.ttc.entity.Snowflake">
        SELECT * FROM snowflake s order by s.groupnum desc,s.num desc limit 0,1
    </select>

</mapper>