Question

如何在连接表中设置限制结果的条件？考虑这两个类（仅包括与此问题相关的字段）：

// A customers account
public class PaymentAccount {
   private int paymentaccountno;
   private Set<PaymentAccountItem> accountitems;
}

// Some invoice item related to the account above
public class PaymentAccountItem {
   private int paymentaccountitemno;
   private boolean invoiced;
}

PaymentAccount和PaymentAccountItem之间存在一对多的关系，如下所示：

<class name="PaymentAccount" table="paymentaccount">
 <id name="paymentaccountno">
  <generator class="sequence">
   <param name="sequence_name">paymentaccount_paymentaccountno_seq</param>
  </generator>
 </id>
 <set name="accountitems" table="paymentaccountitem" inverse="false" lazy="true" fetch="select" cascade="all">
  <key column="paymentaccountno" />
  <one-to-many class="PaymentAccountItem" />
  </set>
</class>

<class name="PaymentAccountItem" table="paymentaccountitem">
 <id name="paymentaccountitemno">
  <generator class="sequence">
   <param name="sequence_name">paymentaccountitem_paymentaccountitemno_seq</param>
  </generator>
 </id>
 <property name="invoiced" />
</class>

我想获得所有PaymentAccount对象的列表，但是（对于这种情况），accountitems-Set应该只包含“invoiced = false”的对象。

我是否自己编写SQL查询，我会做类似的事情：

SELECT * from paymentaccount pa, paymentaccountitem pai WHERE pa.paymentaccountno=pai.paymentaccountno AND pai.invoiced=false;

我如何让Hibernate为我做这件事（如果可能的话，最好让我的代码保持良好和无SQL）。

谢谢！

Answer 1

您的查询结果不是实体，您可以尝试这样做：

Query query = session.createSQLQuery(
"SELECT * from paymentaccount pa, paymentaccountitem pai WHERE pa.paymentaccountno=pai.paymentaccountno AND pai.invoiced=false");
List result = query.list();

为已连接的tabled中的行设置选择条件

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