Java Hibernate Criteria选择子类 [英] Java Hibernate Criteria select subclass

问题描述

我想使用Criteria API通过从搜索值中获取输入来选择实体。文档可以包含更多收件人。收件人有许多子类

I want to use the Criteria API to select entities by taking the input from a search value. A document can have more recipients. A recipient has many subclasses

@Entity
public class Document implements Serializable {
  @OneToMany(mappedBy="document")
  private List<Recipient> recipients = new ArrayList<Recipient>();


@Entity
public class RecipientAccount extends Recipient {
  String name;

如何选择具有特定名称的ReciepientAccount的所有文件？
我需要搜索所有子类并用OR连接它们。有优雅的方式吗？

How can i select all documents which have a ReciepientAccount with a certain name? I need to do search all subclasses and connect them with an OR. Is there an elegant way?

问候
m

推荐答案

以下应该有效：

Criteria c = session.createCriteria(Document.class, "document");
c.createAlias("document.recipients", "recipient");
c.add(Restrictions.in("recipient.class", Arrays.asList(SubClass1.class, 
                                                       SubClass2.class,
                                                       SubClass3.class)));
c.add(Restrictions.eq("recipient.name", theName));

这篇关于Java Hibernate Criteria选择子类的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！