cascade =“all”或cascade =“save-update”? NHibernate一对多不会更新

时间:2014-02-19 20:51:26

标签: nhibernate updates cascade nhibernate-cascade

  

遇到问题

当我使用子集合创建一个瞬态实例时,所有内容都会被持久化。

除此之外,如果我更新其中一个子对象的实例,则在保存父对象时它不会更新。

我实际上正在使用cascade="all"

  

Problem reproduction

当我加载了所有客户,并且我更改了发票时出现问题,但我总是使用相同的ISession

var repository = new CustomerRepository(session);
var customers = repository.GetAll();
var customer = customers.Where(c => c.Name == "Stack Overflow").FirstOrDefault();           
customer.Invoices
    .Where(i => i.Number == "1234")
    .Approve(WindowsIdentity.GetCurrent().Name);    
repository.Save(customer);

逐步调试清楚地显示正在执行的repository.Save()方法,并且更改不会显示在底层数据库中。

可以直接对数据库表进行更新,因此没有任何约束导致数据库端的更新失败。

以下是一些代码,以防它可能会有所帮助。

  

Customer.hbm.xml

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" 
                   namespace="MyProject.Model" 
                   assembly="MyProject">
    <class name="Customer" table="AC_CUST" schema="AC">
      <id name="Id" column="AC_CUST_ID" type="Int32" unsaved-value="0">
        <generator class="sequence-identity">
          <param name="sequence">AC_CUST_ID_SEQ</param>
          <param name="schema">AC</param>
        </generator>
      </id>
      <property name="Name" column="AC_CUST_NAME" type="String" 
                not-null="true" />
      <property name="PhoneNumber" column="AC_CUST_PHNUM" type="Int64" 
                not-null="true" />
      <bag name="Invoices" table="ESO_RAPP_ACCES_INFO_DSQ" schema="AC" 
           fetch="join" lazy="true" inverse="true" cascade="all">
        <key column="AC_CUST_ID" foreign-key="AC_CUST_INV_FK" />
        <one-to-many class="Invoice" />
      </bag>
    </class>
</hibernate-mapping>
  

Customer

public class Customer {
    public Customer() { Invoices = new List<Invoice>(); }

    public virtual int Id { get; proected set; }
    public virtual IList<Invoice> Invoices { get; protected set; }
    public virtual string Name { get; set; }
    public virtual string PhoneNumber { get; set; }
}
  

Invoice.hbm.xml

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" 
                   namespace="MyProject.Model" 
                   assembly="MyProject">
    <class name="Invoice" table="AC_INV" schema="AC">
      <id name="Id" column="AC_INV_ID" type="Int32" unsaved-value="0">
        <generator class="sequence-identity">
          <param name="sequence">AC_INV_ID_SEQ</param>
          <param name="schema">AC</param>
        </generator>
      </id>
      <property name="Approved" column="AC_INV_APPRD" type="DateTime" 
                not-null="false" />
      <property name="Approver" column="AC_INV_APPRR" type="String" length="15" 
                not-null="false" />
      <property name="Number" column="AC_INV_NUMBR" type="String" length="15" 
                not-null="true" />
      <property name="Produced" column="AC_INV_PROD" type="DateTime" 
                not-null="false" />
      <many-to-one class="Customer" column="AC_CUST_ID" />
    </class>
</hibernate-mapping>
  

Invoice

public class Invoice {
    public Invoice() { 
        Items = new List<Item>(); 
        Produced = DateTime.Now;
    }

    public virtual DateTime? Approved { get; protected set; }
    public virtual string Approver { get; protected set; }
    public virtual Customer Customer { get; set; }
    public virtual int Id { get; proected set; }
    public virtual string Number { get; set; }
    public virtual DateTime? Produced { get; set; }

    public virtual void Approve(string approver) {
        Approved = DateTime.Now;
        Approver = approver;
    }

    public virtual void Reject() { Produced = null; }
}
  

CustomerRepository

public class CustomerRepository {
    public CustomerRepository(ISession session) { Session = session; }

    public ISession Session { get; protected set; }

    public Customer Save(Customer instance) {
        Session.SaveOrUpdate(instance);
        return Instance;
    }
}
  

相关文章

任何帮助表示感谢。

1 个答案:

答案 0 :(得分:0)

不要忘记Flush()你的会话!

NHibernate会跟踪会话生命周期中的所有更改,这些更改应仅适用于表单(桌面)或页面(Web)。

由于会话知道所有更改,因此它不一定会将更改提交到基础数据库。相反,它会将所有更改记录到字典中,然后在通过调用ISession.Flush()刷新它时,您实际上要求会话提交更改。

所以解决方案应该是:

repository.Save(customer);
session.Flush();

或者你也可以在你的资源库中编写一个Commit()方法,在调用时Flush()会话。

repository.Save(customer);
repository.Commit();

您的存储库看起来像:

// Assuming you stock your session in the `Session` property.
public void Commit() { Session.Flush(); }

这就是全部!