oracle时间比较和分页查询

条件判断

 <select id="xx" parameterType="Map" resultType="Map">
        select * from (
        select rownum rn, person.client_id as id,
        person.client_id,
        person.name,
        person.cert_type,
        person.cert_no,
        person.birthday,
        person.sex,
        case photo.photo_state
        when '0' then
        '正常'
        when '1' then
        '注销'
        else
        '无'
        end as photo_state
        from xx
        left join xo
        on id = t_id
        where te = '0'
        <!-- 判断是否有查询内容-start -->
        <if test="search.certType != null and search.certType != ''">
            AND person.cert_Type=#{search.certType}
        </if>
        <if test="search.certNo != null and search.certNo != ''">
            AND person.cert_no=upper(#{search.certNo})
        </if>
        <if test="search.name != null and search.name != ''">
            AND person.name LIKE concat(concat('%', #{search.name}), '%')
        </if>
        <!-- 判断是否有查询内容-end -->
        <!-- 没有排序条件，自定义默认排序字段 -->
        <choose>
            <when test="order != null and order != ''">
                ORDER BY ${order}
            </when>
            <!-- 默认按照用户创建时间倒序 -->
            <otherwise>ORDER BY person.open_date desc</otherwise>
        </choose>
        )
        <!-- 分页条件 -->
        where rn &lt;= (#{start} + #{length}) and rn &gt; #{start}
    </select>

时间比较：

SELECT REGION_NO,COUNT(*) total
                  FROM xx
                  WHERE 1=1
           <if test="search.beginDate != null and search.beginDate != ''">
            <![CDATA[
               and SIGN_TIME>to_date(#{search.beginDate},'yyyy-mm-dd hh24:mi:ss')
            ]]>
           </if>
          <if test="search.endDate != null and search.endDate != ''">
            <![CDATA[
               and SIGN_TIME<to_date(#{search.endDate},'yyyy-mm-dd hh24:mi:ss')
            ]]>
          </if>
          group by REGION_NO ) z
  WHERE z.REGION_NO=d.REGION_NO
-- ==============================================================================
 where r.client_id = b.client_id and r.data_complete = '0' and r.apply_time >=to_date(#{search.beginDate},'yyyy-MM-dd')
        and r.apply_time<![CDATA[ <= ]]>to_date(concat(#{search.endDate},' 23:59:59'),'yyyy-MM-dd HH24:mi:ss')

select * from(
select rownum as rn,e.* from(
select *,to_char(t.order_time, 'yyyy-mm-dd hh24:mi:ss') order_time,t.biz_id,b.biz_name,bt.trade_name,t.CERT_NO
from xxt
WHERE b.zD=t.zx
--and order_time>to_date('2020-08-30 22:00:00','yyyy-mm-dd hh24:mi:ss')and order_time<to_date('2021-06-10 22:00:00','yyyy-mm-dd hh24:mi:ss')
)e)
-- order_time>str_to_date('2019-11-30 22:00:00','yyyy-mm-dd hh24:mi:ss')and order_time<str_to_date(ch, fmt)('2021-06-10 22:00:00','yyyy-mm-dd hh24:mi:ss')
-- and order_time>to_date('2020-08-30 22:00:00','yyyy-mm-dd hh24:mi:ss')and order_time<to_date('2021-06-10 22:00:00','yyyy-mm-dd hh24:mi:ss')

分页查询

<select id="xx" parameterType="Map" resultType="java.util.Map">
        select * from(
         select rownum as rn,e.* from(
             select t.x,t.x,s.xAS x,t.x,t.x,
                    s1.xAS x,to_char(t.order_time, 'yyyy-mm-dd hh24:mi:ss') order_time,
                    t.biz_id,b.biz_name,bt.trade_name,t.x
             from xtWHERE b.x=t.xand t.x=#{cert_no}
                  <![CDATA[
                     and order_time>to_date(#{begin_date},'yyyy-mm-dd hh24:mi:ss')
                  ]]>
                  <![CDATA[
                     and order_time<to_date(#{end_date},'yyyy-mm-dd hh24:mi:ss')
                  ]]>
         )e)
        <!-- 分页条件 -->
        where rn &lt;= (#{start} + #{length}) and rn &gt; #{start}
    </select>
========================================================================================

使用：
      --rownum关键字：oracle对外提供的自动给查询结果编号的关键字，与每行的数据没有关系。
        --注意：rownum关键字只能做< <=的判断，不能进行> >=的判断

 select rownum ,e.* from emp e;

      --查询员工信息的前5条数据 第一页数据

 select rownum r,e.* from emp e where rownum <=5;
      select * from (select rownum r,e.* from emp e where rownum <=5) t where r>0;

      --查询员工信息的6-10条数据 第二页数据

  select rownum r,e.* from emp e where rownum <=10;
      select rownum,t.* from (select rownum r,e.* from emp e where rownum <=10) t where r>5;

      --查询员工信息的11-15条数据 第三页数据    

select rownum r,e. * from emp e where rownum<=15;
      select * from (select rownum r,e. * from emp e where rownum<=15) t where r>10;

      --分页规律总结：每页显示m条数据，查询第n页数据  

  select * from (select rownum r,e. * from 要分页的表 e where rownum<=m*n) t where r>m*n-m ;

      --要分页的表既可以是真实的表，也可以是一个查询语句

      --分页查询员工信息按照工资排序

   select * from (select rownum r,t.* from (select * from emp  order by sal) t where rownum<=10 ) where r>5

注：sql代码不完整