zoukankan      html  css  js  c++  java
  • Hibernate:Disjunction&Conjunction构造复杂的查询条件.

                                                                          Hibernate:Disjunction&Conjunction构造复杂的查询条件

    Disjunction和Conjunction是逻辑或和逻辑与,如下:

    用来组合一组逻辑或【or】条件的方法

    1.Restrictions.disjunction();

    用来组合一组逻辑与【and】条件的方法

    2.Restrictions.conjunction();
    


     

    实例一:构造复杂的SQL查询条件

    private void CheckBsc_lj(Criteria queryCriteria) 
     {
      Disjunction disjunction = Restrictions.disjunction();
      Criterion cirterion = Restrictions.sqlRestriction("SIMULPORTCAPACITY<SIMULPORTCAPACITYOCUPIED".toLowerCase());
      disjunction.add(cirterion);
      cirterion = Restrictions.sqlRestriction("ADSLPORTCAPACITY<ADSLPORTCAPACITYOCCUPIED".toLowerCase());
      disjunction.add(cirterion);
      cirterion = Restrictions.sqlRestriction("LANPORTCAPACITY<LANPORTCAPACITYOCCUPIED".toLowerCase());
      disjunction.add(cirterion);
      
      // ONU端口,至少要录入一种端口
      Conjunction conjunction = Restrictions.conjunction();
      cirterion = Restrictions.eq("lanportcapacity", 0);
      conjunction.add(cirterion);
      cirterion = Restrictions.eq("simulportcapacity", 0);
      conjunction.add(cirterion);
      cirterion = Restrictions.eq("adslportcapacity", 0);
      conjunction.add(cirterion);
    
      disjunction.add(conjunction);
      queryCriteria.add(disjunction);
     }
    
    构造出的条件如下:
    select *
      from aaaa this_
     where (simulportcapacity < simulportcapacityocupied or
           adslportcapacity < adslportcapacityoccupied or
           lanportcapacity < lanportcapacityoccupied or
           (this_.LANPORTCAPACITY = ? and this_.SIMULPORTCAPACITY = ? and
           this_.ADSLPORTCAPACITY = ?)) 

    实例二:构造模糊查询

            Disjunction dis=Restrictions.disjunction();   
            dis.add(Restrictions.like("chanpin", "冰箱", MatchMode.ANYWHERE));   
            dis.add(Restrictions.like("chanpin", "洗衣机", MatchMode.ANYWHERE));   
            dis.add(Restrictions.like("chanpin", "热水器", MatchMode.ANYWHERE));   
            dis.add(Restrictions.like("chanpin", "空调", MatchMode.ANYWHERE));   
            detachedCriteria.add(dis);
    



     


     

    版权声明:本文为博主原创文章,未经博主允许不得转载。

  • 相关阅读:
    redis实现与分析
    NULL, '',0 '0'的区别
    Linux strace命令
    strcpy和memcpy的区别
    图书推荐
    php与mysql通讯那点事
    linux命令汇总
    linux系统信息查询及相关概念
    LNMP zabbix安装
    lftp查看文件时间与登录服务查看文件时间相差8小时
  • 原文地址:https://www.cnblogs.com/ywx-vashon/p/4895707.html
Copyright © 2011-2022 走看看