我有一对多项(ID,姓名)的订单(ID,姓名):
我怎么能只获取这些命令它有一个CriteriaBuilder名“香蕉”的项目:
@Override
public Order orderQuery() {
CriteriaBuilder cb = entityManager.getCriteriaBuilder();
CriteriaQuery criteriaQuery = cb.createQuery(Order.class);
Root root = criteriaQuery.from(Order.class);
root.fetch("items", JoinType.INNER);
CriteriaQuery d = criteriaQuery.select(root);
criteriaQuery.where(cb.equal(root.get("item.name"), "banana"));
return (Order)this.entityManager.createQuery(criteriaQuery).getSingleResult());
}
我得到的错误:
Unable to locate Attribute with the the given name [item.name] on
你需要使用一个加入。周围的东西这些行:
Join< Order ,Item> joinItems = root.join("items");
criteriaQuery.where(cb.equal(joinItems.get("item.name"), "banana"));
或者你可以这样做:
criteriaQuery.where(cb.equal(root.get("items").get("name"), "banana"));