Nhibernate Unknown entity class 的解决办法

概述:

     当运行 session.Save(tnp);时,出现这个"Unknown entity class: TestCleanSnow.TestNhibernatePerson"这个异常.

     映射文件 TestNhibernatePerson.hbm.xml如下:  

 
  <? 
  xml version="1.0" encoding="utf-8" 
  ?> 
  
 
  < 
  hibernate-mapping  
  xmlns 
  ="urn:nhibernate-mapping-2.2" 
   assembly 
  ="TestCleanSnow" 
   namespace 
  ="TestCleanSnow" 
  > 
  
   
  < 
  class  
  name 
  ="TestCleanSnow.TestNhibernatePerson,TestCleanSnow" 
   table 
  ="TEST_NHIBERNATE_PERSON" 
   lazy 
  ="false" 
  > 
  
     
  < 
  id  
  name 
  ="Usertestid" 
   column 
  ="USERTESTID" 
   type 
  ="Decimal" 
  > 
  
       
  < 
  generator  
  class 
  ="sequence" 
  > 
  
         
  < 
  param  
  name 
  ="sequence" 
  > 
  emp_sequence 
  </ 
  param 
  > 
  
       
  </ 
  generator 
  > 
  
     
  </ 
  id 
  > 
  
     
  < 
  property  
  type 
  ="string" 
   not-null 
  ="true" 
   length 
  ="6" 
   name 
  ="Usertestname" 
   column 
  ="USERTESTNAME" 
    
  /> 
  
   
  </ 
  class 
  > 
  
 
  </ 
  hibernate-mapping 
  > 
 

 

操作代码如下:

 

 
  Configuration config  
  = 
    
  new 
   Configuration();              
                ISessionFactory factory  
  = 
   config.BuildSessionFactory();
                ISession session  
  = 
   factory.OpenSession();

                TestNhibernatePerson tnp  
  = 
    
  new 
   TestNhibernatePerson();
 tnp.Usertestname  
  = 
    
  " 
  test4 
  " 
  ;
  ITransaction trans  
  = 
   session.BeginTransaction();
            
  try 
  
           {
             
                
  // 
   保存记录 
  
 
                 session.Save(tnp);
               trans.Commit();
               Console.WriteLine( 
  " 
  Insert Success! 
  " 
  );

                                          
           }
            
  catch 
   (Exception ex)
           {
               trans.Rollback();
               Console.WriteLine(ex.Message);
           }

            
  finally 
  
           {
               session.Close();
           } 
 

 

配置代码app.config如下: 

 
  < 
  configuration 
  > 
  
   
  <!-- 
   Add this element  
  --> 
  
   
  < 
  configSections 
  > 
  
     
  < 
  section  
  name 
  ="hibernate-configuration" 
   type 
  ="NHibernate.Cfg.ConfigurationSectionHandler, NHibernate" 
    
  /> 
  
     
  <!-- 
  <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net" /> 
  --> 
  
   
  </ 
  configSections 
  > 
  
   
  <!-- 
   Add this element  
  --> 
  
   
  < 
  hibernate-configuration  
  xmlns 
  ="urn:nhibernate-configuration-2.2" 
     
  > 
  

     
  < 
  session-factory 
  > 
  
       
  < 
  property  
  name 
  ="dialect" 
  > 
  NHibernate.Dialect.OracleDialect 
  </ 
  property 
  > 
  
       
  < 
  property  
  name 
  ="connection.provider" 
  > 
  NHibernate.Connection.DriverConnectionProvider 
  </ 
  property 
  > 
  
       
  < 
  property  
  name 
  ="connection.connection_string" 
  > 
  user id=jkpt;data source=jkorasvr;password=designer; 
  </ 
  property 
  > 
  
       
  < 
  property  
  name 
  ="connection.isolation" 
    
  > 
  ReadCommitted 
  </ 
  property 
  > 
  
       
  < 
  property  
  name 
  ="show_sql" 
  > 
  true 
  </ 
  property 
  > 
  
       
  <!-- 
   mapping files  
  --> 
  
       
  < 
  mapping  
  assembly 
  ="TestCleanSnow" 
    
  /> 
  
     
  </ 
  session-factory 
  > 
  
   
  </ 
  hibernate-configuration 
  > 
 

 

 

说明:在操作代码中加载相应引用后 config.AddAssembly("TestCleanSnow");,就不出现错误.

如果以配置文件的形式加载引用却出现如题的错误.

 

原因分析：

解决1:

   可能是相应的映射文件没有设置成"嵌入式资源".我这里相应的映射文件为 TestNhibernatePerson.hbm.xml.

   在解决方案资源管理器中找到TestNhibernatePerson.hbm.xml该映射文件

   右击---属性----在将“生成操作”设置成“嵌入的资源”.

 

解决2：

我把 Configuration config = new Configuration();改成 Configuration config = new Configuration().Configure();

让程序去找hibernate.cfg.xml,这个配置文件的配置跟app.config中的一样。

 

解决3：
检查映射文件映射文件 TestNhibernatePerson.hbm.xml的配置是否正确，其中

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="模块名称" namespace="命名空间">
  <class name="类名" table="数据库表名" lazy="false">
    <id name="Usertestid" column="USERTESTID" type="Decimal">    //主键

 <generator class="sequence">      //主键生成方式