Nhibernate IsessionFactory 的 Unity Xml 配置

Question

我使用代码解析会话工厂

UnityContainer.RegisterInstance(typeof(ISessionFactory),
                new NHibernate.Cfg.Configuration().Configure().BuildSessionFactory());

我的服务将属性定义为

public class myService
{
   [Dependency]
   public ISessionFactory SessionFactory{get;set;}
}

但是不知道如何使用unity 2的XML配置来配置这个。

Answer 1

免责声明，此答案与此处https://stackoverflow.com/a/29730411/1679310（cmets）中讨论的内容更相关

让我为您提供与您的映射相关的更多详细信息。

首先，减少全名：

// here we have namespace, not needed below for classes, if is the same
<hibernate-mapping  ... namespace="NhibernateTesting.Models" >

原来的类映射被注释掉了，我的做法是替换掉：

// <class name="NhibernateTesting.Models.ProductList" table="ProductList" lazy="false">    
<class name="ProductList" table="ProductList" 
  lazy="true" // always use LAZY
  batch-size="25" // optimization for loading - avoid 1 + N
>

//<id name="Id">
//  <generator class="native" />
//</id>
// more readable version
<id name="Id" generator="native" />

// these are OK
<property name="Name" />
<property name="Owner" />

// collection should be ALWAYS lazy
// <bag name="Viewers" table="ProductListViewer" lazy="false">
// and also, optimization as batch size is needed
<bag name="Viewers" table="ProductListViewer" 
  lazy="true" // LAZY is must, 
  batch-size="25" cool optimization to avoid 1 + N
>
  <key column="ProductListId" />
  <element column="Username" type="System.String"/>
</bag>

// I would never use MANY-TO-MANY
// <bag name="Products" table="ProductListProductXRef" lazy="false" cascade="all" fetch="select">
<bag name="Products" table="ProductListProductXRef" 
   inverse="true" // in many to many only one side could be inverse
   lazy="true" 
   cascade="none"  // cascade here means, delete PRODUCTS
                  // not the pairing table, so I would expect that we need none
   fetch="select">
  <key column="ProductListId" />

  // I would avoid many to many if possible
  <many-to-many column="ProductId" class="NhibernateTesting.Models.Product" />
 ...

查看这些链接了解更多详情。

懒惰

• NHibernate When to Use lazy loading?

批量抓取

• NHibernate always hydrates many-to-one
• How to Eager Load Associations without duplication in NHibernate?

避免多对多

• many-to-many with extra columns nhibernate
• Nhibernate: How to represent Many-To-Many relationships with One-to-Many relationships?

何时使用级联

• nhibernate - Create child by updating parent, or create explicitly?

这些是我的建议，适用于所有映射。

一般来说这应该是类映射

<class 
  name="ProductList" 
  table="ProductList" 
  lazy="true"
  batch-size="25"
>

如果我们需要版本控制：

<class 
  name="ProductList" 
  table="ProductList" 
  lazy="true"
  batch-size="25"
  optimistic-lock="version" 
  dynamic-update="true" 
>

<version name="Timestamp" generated="always" unsaved-value="null" type="BinaryBlob">
  <column name="RowVersion" not-null="false" sql-type="timestamp"/>
</version>

这应该是集合映射：

<bag name="Items" 
   lazy="true" 
   inverse="true" 
   batch-size="25" 
   cascade="all-delete-orphan">
  <key column="Item_ID" />
  <one-to-many class="SomeItemClass"/>
</bag>