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);

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