数码资讯
使用Hibernate Criteria实现in子查询和exists子查询
选购提示
关注价格、性能、续航、售后和真实使用场景,理性比较后再下单。
使用Criteria实现以下SQL语句的效果(in):
select * from
BK_ProjectCard this_
where
this_.resCompanyId in (
select
this_.id as y0_
from
SYSTEM_DEPARTMENT_INFO this_
)
实现代码:
Criteria criteria = this.getSessionFactory().getCurrentSession().createCriteria(ProjectCard.class);
DetachedCriteria inCriteria = DetachedCriteria.forClass(DepartmentInfo.class);
inCriteria.setProjection(Property.forName("id"));
criteria.add(Property.forName("resCompanyId").in(inCriteria));
List<ProjectCard> projectCards = criteria.list();
使用Criteria实现以下SQL语句的效果(exists):
select * from BK_ProjectCard pc where exists in(select this_.id as y0_ from SYSTEM_DEPARTMENT_INFO this_ where this_.id = pc.resCompanyId)
Criteria criteria = this.getSessionFactory().getCurrentSession().createCriteria(ProjectCard.class, "pc");
DetachedCriteria existsCriteria = DetachedCriteria.forClass(DepartmentInfo.class, "sdi");
existsCriteria.add(Property.forName("sdi.id").eqProperty(Property.forName("pc.resCompanyId")));
existsCriteria.add(Restrictions.like("name", "%test%"));
criteria.add(Subqueries.exists(existsCriteria.setProjection(Projections.property("sdi.id"))));
List<ProjectCard> projectCards = criteria.list(); PS:实体类中并没有建立两个对象的关联关系,仅在ProjectCard对象中创建了一个resCompanyId的属性,用于存储DepartmentInfo表的ID。
声明:本文内容用于数码产品信息整理与选购参考,具体价格、库存、售后政策以官方渠道和电商页面实时信息为准。