NHibernate错误集合

（1）Nhibernate错误”No persister for ”

          Nhibernate错误”No persister for <entity name>”

         例如：”No persister for DomainModel.Entities.User”

    1.检查hibernate.cfg.xml是否配置mapping 如：<mapping                          assembly="”DomainModel”/">

    2.检查User.hbm.xml文件属性“生成操作”的值，从“内容”修改为“嵌入的资源”

(2)Could not find the dialect in the configuration这个错误，

     这是数据库配置问题

     <hibernate-mapping xmlns="urn:nhibernate-mapping-2.0">

    换成

    <hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">

（3）The ProxyFactoryFactory was not configured 报错

     因为没有引用上面那个配置中的工厂类所以在引用下             Required_For_LazyLoading文件夹下的 LinFu下的NHibernate.ByteCode.LinFu.dll当然也可以用 Castle 那要改下配置</hibernate-mapping></hibernate-mapping></mapping></entity>

(4)、Could not compile the mapping document

 解决办法:

  调试查看到InnerText为,不应该为<hibernate-mapping xmlns="urn:nhibernate-mapping-2.0">,然后我把改为

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">后,此问题解决.

（5）NHibernate.InvalidProxyTypeException

        The following types may not be used as proxies: TestCleanSnow.BjkptOaxtCleanupsnow: method set_IsDeleted should be virtual TestCleanSnow.BjkptOaxtCleanupsnow: method set_IsChanged should be virtual TestCleanSnow.BjkptOaxtCleanupsnow: method Clone should be virtual TestCleanSnow.BjkptOaxtCleanupsnow: method get_IsChanged should be virtual TestCleanSnow.BjkptOaxtCleanupsnow: method get_IsDeleted should be virtual

解决办法： 在XML的 <class name="TestCleanSnow.BjkptOaxtCleanupsnow,TestCleanSnow" table="B_JKPT_OAXT_CLEANUPSNOW"> 添加  lazy="false" .

（6）在执行 session.Save(cs);

时,出现could not get next sequence value[SQL: SQL not available] Nhibernate

解决办法:

把相应XML的

 <generator class="native" /> 改为 <generator class="assigned" />

以上我做Oracle时出现的错误,操作sqlserver的时候应该为 <generator class="native" />.

（7）转载与： http://hi.baidu.com/zsea/blog/item/7d999e3d8a54c203baa1678d.html

一、Test.Model.Person.hbm.xml(2,2): XML validation error: 未能找到元素“urn:nhibernate-mapping-2.0:hibernate-mapping”的架构信息。

       将2.0改为2.2

二、 The following types may not be used as proxies:
         Test.Model.Person: method set_Id should be virtual
         Test.Model.Person: method get_Name should be virtual
         Test.Model.Person: method set_Name should be virtual
         Test.Model.Person: method get_Id should be virtual

         类配置文件中Class的Lazy改为false
         网上搜到的三种解决方案：
        1.   You can follow the advice of the exception and add "virtual" to all of your properties, and make sure your class is non-sealed. Obviously you'll want to do this if you think you might want to take advantage of the lazy-initializing proxy feature.   However, changing your classes may not be practical or advisable if you have a legacy codebase, or it may just bother you that a "transparent" persistence framework is dictating how you design certain aspects of your value classes.   That's where Options 2 and 3 come in.   Both of those involve changing back to the old behavior.

          2.  To change the lazy-initialization proxy setting for a specific class, you can add a "lazy='false'" attribute to the <class> mapping element.   This might look something like:

<class
     name="NorthwindClasses.Category, NorthwindClasses"
     table="Categories"
     lazy="false"
>

        3.  To change the lazy-initialization proxy setting for all classes in a given mapping file, you can add a "default-lazy='false'" attribute to the <hibernate-mapping> element, as follows:

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.0" default-lazy="false">

Unfortunately, Option 3 doesn't really help you much if you do one <class> mapping per <hibernate-mapping> file, a practice which I personally follow and recommend.   It's too bad, but there doesn't seem to be any way to set this default in the <nhibernate> global configuration.   But if you do happen to have all of your <class>'s in one .hbm.xml file, "default-lazy" can help you out.

hbm.xmlNHibernate文件中版本号可能引起的问题. 

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">        
  此处的2.2代表了NHibernate的版本号,必须与你安装的NHibernate的产品版本号相符.否则的话,举个例子,若为urn:nhibernate-mapping-2.0,则会出现如下错误: Could not find schema information for the element 'urn:nhibernate-mapping-2.0:hibernate-mapping'. 或是:"NHibernate.Cfg.Environment的类型初始值设定项引发异常".

在对照类中如果属性没有加virtual关键字,可能报

NHibernate.InvalidProxyTypeException: The following types may not be used as proxies:
Model.FriendLink: method set_Description should be virtual
Model.Type: method get_TypeName should be virtual.....
这是一种解决方案是给属性加上virtual关键字,另一种解决方法是在映射文件中加入default-lazy="false".

in expected: <end-of-text> (possibly an invalid or unmapped class name was used in the query)．

映射文件没有将属性设为＂嵌入的资源＂或者调方法时表名大小写问题

"Could not find the dialect in the configuration"异常

异常描述:

NHibernate.MappingException: Could not compile the mapping document: Model.FriendLink.hbm.xml ---> System.InvalidOperationException: Could not find the dialect in the configuration
  在 NHibernate.Dialect.Dialect.GetDialect(IDictionary`2 props)
  在 NHibernate.Cfg.Configuration.AddValidatedDocument(NamedXmlDocument doc)
解决方法:

配置文件中xmlns="urn:nhibernate-configuration-2.2"千万不能忘记,确保没有忘掉xmlns="urn:nhibernate-configuration-2.2"就可以解决这个bug.

另参见：http://blog.csdn.net/lateknow/archive/2009/12/02/4924856.aspx