1

当使用具有多层双向父子（-grandchild）一对多关系的二级缓存时，我从 NHibernate 得到非常奇怪的行为：

int id;

using(var session = sessionFactory.OpenSession())
{
    var parent = new Parent();
    var child1 = parent.AddChild();
    child1.AddGrandChild();
    var child2 = parent.AddChild();
    child2.AddGrandChild();
    session.Save(parent);
    session.Flush(); // force id generation
    id = parent.Id;
}

using(var session = sessionFactory.OpenSession())
{
    var parent = session.Get<Parent>(id);
    parent.Children.Should().HaveCount(2); // but is actually 3; second child duplicated
}

第二个孩子，有两个孙子，在集合中被复制，但具有相同的对象 id ( ReferenceEquals()is true)。当我禁用Parent.Children集合的缓存或将获取策略设置为 时Join，问题就消失了。任何想法如何找出这里发生的事情？

实体：

class Parent
{
    public virtual int Id { get; protected set; }
    public virtual List<Child> children = new List<Child>();
    public virtual IEnumerable<Child> Children
    {
        get { return children.ToList(); }
    }

    public virtual Child AddChild()
    {
        var child = new Child(this);
        this.children.Add(child);
        return child;
    }
}

class Child
{
    public Child(Parent parent)
    {
        this.Parent = parent;
    }

    public virtual int Id { get; protected set; }
    public virtual List<GrandChild> grandChildren = new List<GrandChild>();
    public virtual IEnumerable<GrandChild> GrandChildren
    {
        get { return grandChildren.ToList(); }
    }

    public virtual Parent Parent { get; protected set; }

    public virtual GrandChild AddGrandChild()
    {
        var grandChild = new GrandChild(this);
        this.grandChildren.Add(grandChild);
        return grandChild;
    }

}

class GrandChild
{
    public virtual int Id { get; protected set; }
    public virtual Child Parent { get; protected set; }

    public GrandChild(Child parent)
    {
        this.Parent = parent;
    }

}

映射：

public class ParentMap : ClassMap<Parent>
{
    public ParentMap()
    {
        Id(p => p.Id).GeneratedBy.Identity();
        HasMany(p => p.Children)
            .Access.CamelCaseField()
            .Inverse()
            .Cascade.AllDeleteOrphan()
            .Cache.ReadWrite();
        Cache.ReadWrite();
    }
}

public class ChildMap : ClassMap<Child>
{
    public ChildMap()
    {
        Id(c => c.Id).GeneratedBy.Identity();
        HasMany(c => c.GrandChildren)
            .Access.CamelCaseField()
            .Inverse()
            .Cascade.AllDeleteOrphan()
            .Cache.ReadWrite();
        References(c => c.Parent);
        Cache.ReadWrite();
    }
}

public class GrandChildMap : ClassMap<GrandChild>
{
    public GrandChildMap()
    {
        Id(c => c.Id).GeneratedBy.Identity();
        References(c => c.Parent);
        Cache.ReadWrite();
    }
}

[编辑]

我通过不为子集合启用缓存来解决这个问题。因为我首先这样做是为了避免fetch join对缓存实体的子项进行查询时出现 N+1 选择问题，所以我改为执行以下操作：

    public ChildMap()
    {
       // ...
        HasMany(c => c.GrandChildren) // removed Cache.ReadWrite() here
            /* ... */;

        // added IncludeAll() to make sure lazily fetched collections get cached
        Cache.ReadWrite().IncludeAll(); 
    }

不过，我仍然不明白这里发生了什么，所以仍然欢迎对此事有任何见解:-)。

4

1 回答 1

0

您是否尝试过使用事务而不是会话刷新？喜欢

using(var session = sessionFactory.OpenSession())
using(var transaction = session.BeginTransaction())
{
    var parent = new Parent();
    [...]
    parent.Save();
    transaction.Commit();
    id = parent.Id;
}

也许这有帮助。我曾经遇到过类似的问题，我可以通过使用事务来解决。

于 2013-03-27T20:27:25.943 回答