工作中bug总结

1 常见传入参数strTime 格式问题 2018-08-09 而数据库要求的是20180809 数据库中数据类型有可能是int

2      DefraudingEffect et = new DefraudingEffect();
       displayList.add(et); list中只存的是对对象的引用，
       displayList.add(et);
       displayList.get(4).setTelno("15220092297");
       displayList.get(4).setEventTime("2018-08-13 20:03:00");
       displayList.get(4).setMeasureType("电话外呼");

       displayList.get(3).setTelno("15220092342");
       displayList.get(3).setEventTime("2018-08-13 20:03:00");
       displayList.get(3).setMeasureType("电话外呼11111111");

最后加入list的值是最后设置的数据，之前的数据会被覆盖

3 Exception in thread “main” java.lang.UnsupportedClassVersionError: javaee/appTest : Unsupported major.minor version 52.0
原因分析：高版本编译器编译后不能在低版本的JVM上运行，而本机上安装了多个跨版本的JDK
解决方案：将IDE编译器与JVM虚拟机版本改为相同。

4 mybatis中的return类型，sql，参数为一个的时候<if test="_parameter !=null">

当有序列的时候：要使用 nextval（'序列名称'）

<select id="selectSeq" resultType="java.lang.Long">
select nextval('gis2_msg_info_id_seq') as seqid
</select>

<insert id="batchInsert" parameterType="java.util.ArrayList">
   insert into
       gis2_msg_info_ext(msg_id, tag_name, tag_value)
   values
   <foreach item="sms" collection="list" separator="," >
       (#{sms.msgId,jdbcType=BIGINT}, #{sms.tagName,jdbcType=VARCHAR}, #{sms.tagValue,jdbcType=VARCHAR})
   </foreach>
</insert>

5    select
       a.custtitle,
(select count(*) from gis2_sms_response msgrep
where msgrep.taskid=a.id) as replayCount // 嵌套查询
   from
       gis2_msg_info a
   left JOIN channel_info b
       on a.channel_id=CAST(b.id as varchar) // 强制转换成字符
   left join system_user c
       on a.edit_user_id=c.user_id
   where
       <if test="editDate!=null and editDate!=''">
       and   to_date(to_char(a.edit_time, 'YYYY-MM-DD'),'YYYY-MM-DD') = to_date(#{editDate},'YYYY-MM-DD')
       </if>
       <if test="startDate!=null and startDate!=''">
       and a.edit_time >=to_date(#{startDate},'YYYY-MM-DD HH24:MI:SS')
       </if>
       <if test="endDate!=null and endDate!=''">
       and a.edit_time <= to_date(#{endDate},'YYYY-MM-DD HH24:MI:SS') // 转换时间
       </if>
       <if test="msgContent!=null and msgContent!=''">
       and a.msg_content like CONCAT(CONCAT('%', #{msgContent}), '%') // 字符拼接
       </if>

   <if test="countyId!=null and countyId!=0 ">
       and county_id = #{countyId}::numeric // 将countyId转换成数字
   </if>
       <if test="status!=null and status.size>0">
       and a.status in
           <foreach collection="status" index="index" item="state" separator="," open="(" close=")">
          #{state}
       </foreach>
       </if>
       order by a.id desc
       limit #{pageSize} offset #{pageNo}

select (
select
sum(CAST(sendcount as numeric(16))) as todayCount
from
       gis2_msg_info
where start_time like CONCAT(CONCAT(#{strTime}), '%')
   ) as todayCount
,
(
select count(*) from gis2_sms_response where taskid in
(
select    id
from gis2_msg_info

where start_time like CONCAT(CONCAT(#{strTime}), '%')
)
) as todayReply

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