JPA2.0 Join联结查询

　2012-05-23 16:16:34　来源：WEB开发网　　　

核心提示：CriteriaBuilder cb = getEntityManager().getCriteriaBuilder(); CriteriaQuery<Photo> cq = cb.createQuery(Photo.class); Root<Photo> root_ = cq.from

CriteriaBuilder cb = getEntityManager().getCriteriaBuilder(); 
  CriteriaQuery<Photo> cq = cb.createQuery(Photo.class); 
  Root<Photo> root_ = cq.from(Photo.class); 
  Join<Photo, ServiceItem> join = root_.join(Photo_.serviceItems, 
    JoinType.LEFT); 
  cq.select(root_);

JPA2.0 join联结查询

CriteriaBuilder cb = getEntityManager().getCriteriaBuilder();
CriteriaQuery<Photo> cq = cb.createQuery(Photo.class);
Root<Photo> root_ = cq.from(Photo.class);
Join<Photo, ServiceItem> join = root_.join(Photo_.serviceItems,
		JoinType.LEFT);
cq.select(root_);