遇到的问题
当我创建一个带有子集合的临时实例时,所有内容都会被持久化。
此外,如果我更新其中一个子对象的实例,则在保存父对象时不会更新它。
我实际上在使用cascade="all"
Problem reproduction
当我加载了我的所有客户事件,并且我更改了发票,尽管我总是使用相同的ISession
时,就会出现问题。
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了正在执行的repository.Save()
方法,并且更改不会显示在底层数据库中。
可以直接针对数据库表进行更新,因此不会在数据库端导致更新失败
这里有一些代码,以防有帮助。
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;
}
}
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感谢您的帮助。
不要忘记Flush()
您的会话!
NHibernate跟踪会话生命周期中的所有更改,会话生命周期应该只适用于表单(桌面)或页面(Web)。
因为会话知道所有的更改,所以它不一定要将更改提交到底层数据库。相反,它将所有更改的记录保存到字典中,然后当通过调用ISession.Flush()
来刷新它时,您实际上要求会话永远提交更改。
因此,解决方案应为:
repository.Save(customer);
session.Flush();
或者,您也可以在存储库中编写一个Commit()
方法,该方法将在调用时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(); }
仅此而已!