Question

我已经使用NHibernate3声明了fallowing映射：

使用FluentNHibernate

public class ActivityMap : ClassMap<Activity> {
    public ActivityMap() {
        this.Table("Activity");
        this.Cache.ReadWrite();
        this.Version(x => x.ObjectVersion);
        this.Id(x => x.Id).GeneratedBy.Assigned();

        // snipp

        this.HasOne(x => x.AppointmentRecurrence).Cascade.Delete();
    }
}

public class AppointmentRecurrenceMap : ClassMap<AppointmentRecurrence> {
    public AppointmentRecurrenceMap() {
        this.Table("AppointmentRecurrence");
        this.Cache.ReadWrite();     
        this.Version(x => x.ObjectVersion);
        this.Id(x => x.Id).GeneratedBy.Foreign("Activity");

        // snipp

        this.HasOne(x => x.Activity).Constrained();
    }
}

正在生成暂停的hbm-mapping：

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
  <class xmlns="urn:nhibernate-mapping-2.2" lazy="false" name="Prayon.Entities.Activity, Prayon.Entities, Version=1.0.0.867, Culture=neutral, PublicKeyToken=null" table="Activity">
    <cache usage="read-write" />
    <id name="Id" type="System.Guid, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
      <column name="Id" />
      <generator class="assigned" />
    </id>
    <!-- snipp -->
    <one-to-one cascade="delete" class="Prayon.Entities.AppointmentRecurrence, Prayon.Entities, Version=1.0.0.867, Culture=neutral, PublicKeyToken=null" foreign-key="FK_Activity_AppointmentRecurrence" name="AppointmentRecurrence" />
  </class>
</hibernate-mapping>


<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
  <class xmlns="urn:nhibernate-mapping-2.2" lazy="false" name="Prayon.Entities.AppointmentRecurrence, Prayon.Entities, Version=1.0.0.867, Culture=neutral, PublicKeyToken=null" table="AppointmentRecurrence">
    <cache usage="read-write" />
    <id name="Id" type="System.Guid, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
      <column name="Id" />
      <generator class="foreign">
        <param name="property">Activity</param>
      </generator>
    </id>
    <!-- snipp -->
   <one-to-one class="Prayon.Entities.Activity, Prayon.Entities, Version=1.0.0.867, Culture=neutral, PublicKeyToken=null" constrained="true" foreign-key="FK_AppointmentRecurrence_Activity" name="Activity" />
  </class>
</hibernate-mapping>

现在，当我选择Activities（带有cachable-select）时，我在NHibernate-Profiler中看到，NHibernate正在使每个Activity更正出二级缓存，但它会为每个Activity做一个选择到约会重生。我能做什么，它还需要来自缓存的AppointmentReccurrence？我试图在一对一关系上设置缓存属性，但似乎不支持。

Answer 1

您的映射的Constrained方似乎存在问题。根据Ayende的one-to-one指南：

需要注意的是我们必须使用foreign-key =“none”来指定它，因为否则NHibernate的Schema Export功能会为我们创建两个外键，这将创建一个不允许我们插入的循环引用任何东西进入数据库。

显然，FK实际上存在于您的数据库中，但错误配置可能会导致缓存出现问题：

在Fluent中指定foreign-key="none"的方法：

this.HasOne(x => x.Activity).Constrained().ForeignKey();

一对一映射不适用于二级缓存

1 个答案: