mybatis在操作數據庫時遇到列 一級二級三級 排序不正確時候的操作

借用case when

  <!--個人中心列表展示 union 因爲上部是可以和patent匹配的數據，而下面是用戶自己輸入的可能在patent裏沒有記錄的公開號信息，辣眼睛-->
  <select id="selectPersonCenterList" resultMap="BasePatentMonitorSetVO">
      select * from( select a.abs,b.project_name,a.patent_id,a.id,a.pubNumer ,a.appDate,a.title,
      a.applicationName,a.lprs,a.patent_level,a.appNumer,a.pubDate,
      a.iapp,a.ipub,a.divideInitAppNo,a.priority,a.inventroName,a.sameApp,a.den,a.agencyName
      from   (select b.id as patent_id,a.project_id,a.id,a.pubNumber as pubNumer ,b.title,a.apply_date as appDate,
      a.apply_name as applicationName,a.lprs,
      CASE a.patent_level WHEN '一級' THEN 1
      WHEN '二級' THEN 2
      ELSE 3 END
      as patent_level,
      b.appNumer,b.pubDate,
      b.iapp,b.ipub,b.divideInitAppNo,b.priority,b.inventroName,b.sameApp,b.den,b.agencyName,b.abs from patent_monitoring_set a,patent b
      where a.pubNumber=b.pubNumer and a.emp_id=#{map.empId} )a left join patent_project b
      on a.project_id=b.id
      union
      select null as abs,b.project_name,null as patent_id,c.id,c.pubNumer,c.appdate as appDate,c.title,c.applicationname as applicationName,c.lprs,c.patent_level,c.appNumer,c.pubDate,
      c.iapp,c.ipub,c.divideInitAppNo,c.priority,c.inventroname,c.sameApp,c.den,c.agencyName from (select a.project_id,id,a.pubNumber as pubNumer,null as title,a.apply_date as appdate,a.apply_name as applicationname,
      a.lprs,
      CASE a.patent_level WHEN '一級' THEN 1
      WHEN '二級' THEN 2
      ELSE 3 END
      as patent_level,
      null as appNumer, null as pubDate,
      null as iapp,null as ipub,null as divideInitAppNo, null as priority,
      null as inventroname,null as sameApp,
      null as den,null as agencyName
      from patent_monitoring_set a where a.emp_id=#{map.empId} and a.id not in(select a.id from patent_monitoring_set a,patent b
      where a.pubNumber=b.pubNumer and a.emp_id=#{map.empId}))c left join patent_project b
      on c.project_id=b.id)c
      WHERE 1=1
    <if test="map.projectName!='all'">
      and c.project_name like concat('%',#{map.projectName},'%')
    </if>
    <if test="map.pubNumber!='' and  map.pubNumber!=null">
      and c.pubNumer like concat('%',#{map.pubNumber},'%')
    </if>
  </select>

one two more

 SELECT id,CASE 'teacher' WHEN 'dd' THEN 'one'
  WHEN 2 THEN 'two' 
 ELSE 'more' END
 as testCol from employee