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:
< 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:
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:
<!-- 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
