無法實例化連接提供程序：NHibernate.Driver.MySqlDataDriver

Question

我正在使用NHibernate製作一個簡單的Web項目，每當我嘗試構建sessionfactory時，我都會陷入此錯誤。

導致異常的行是這樣的

ISessionFactory sessionFactory = new Configuration().Configure().BuildSessionFactory(); 

人有類似的問題似乎被引用Mysql.data.dll，我已經完成了解決這些問題，並檢查該DLL是在我的倉夾。

我懷疑故障出在我的hibernate.cfg.xml它看起來像這樣

<hibernate-configuration xmlns="urn:nhibernate-configuration-2.2"> 
<session-factory> 
<property name="dialect">NHibernate.Dialect.MySQLDialect</property> 
<property name="connection.provider">NHibernate.Driver.MySqlDataDriver</property> 
<property name="connection.driver_class">NHibernate.Driver.SqlServerCeDriver</property> 
<property name="connection.connection_string">connectionstring</property> 
<property name='proxyfactory.factory_class'>NHibernate.ByteCode.Castle.ProxyFactoryFactory, NHibernate.ByteCode.Castle</property> 
<mapping assembly="Mcgvd" /> 
</session-factory> 
</hibernate-configuration> 

教程我也跟着做這個項目是使用助手類來創建的SessionFactory這樣看

public sealed class NHibernateHelper 
{ 
    private const string CurrentSessionKey = "nhibernate.current_session"; 
    private static readonly ISessionFactory sessionFactory; 

    static NHibernateHelper() 
    { 
     sessionFactory = new Configuration().Configure().BuildSessionFactory(); 
    } 

    public static ISession GetCurrentSession() 
    { 
     HttpContext context = HttpContext.Current; 
     ISession currentSession = context.Items[CurrentSessionKey] as ISession; 

     if (currentSession == null) 
     { 
      currentSession = sessionFactory.OpenSession(); 
      context.Items[CurrentSessionKey] = currentSession; 
     } 

     return currentSession; 
    } 

    public static void CloseSession() 
    { 
     HttpContext context = HttpContext.Current; 
     ISession currentSession = context.Items[CurrentSessionKey] as ISession; 

     if (currentSession == null) 
     { 
      // No current session 
      return; 
     } 

     currentSession.Close(); 
     context.Items.Remove(CurrentSessionKey); 
    } 

    public static void CloseSessionFactory() 
    { 
     if (sessionFactory != null) 
     { 
      sessionFactory.Close(); 
     } 
    } 
} 

hibernate.cfg.xml和hibernate.hbm.xml都位於我的項目的根目錄。

我在這裏做錯了什麼？

Answer 1

除了故障傑米發現我不得不改變我在那裏因某種原因已mysqldatadriver把connection.provider財產。

這是我最終的工作配置。

<hibernate-configuration xmlns="urn:nhibernate-configuration-2.2"> 
<session-factory> 
<property name="dialect">NHibernate.Dialect.MySQLDialect</property> 
<property name="connection.provider">NHibernate.Connection.DriverConnectionProvider</property> 
<property name="connection.driver_class">NHibernate.Driver.MySqlDataDriver</property> 
<property name="connection.connection_string">connectionstring</property> 
<property name='proxyfactory.factory_class'>NHibernate.ByteCode.Castle.ProxyFactoryFactory, NHibernate.ByteCode.Castle</property> 
<mapping assembly="Mcgvd" /> 
</session-factory> 
</hibernate-configuration> 

Answer 2

您的配置錯誤。

<property name="connection.provider">NHibernate.Driver.MySqlDataDriver</property> 
<property name="connection.driver_class">NHibernate.Driver.SqlServerCeDriver</property> 

當您明顯使用MySQL時，您已經爲連接提供者和SQL Server CE驅動程序指定了驅動程序。嘗試：

<property name="connection.provider">NHibernate.Connection.DriverConnectionProvider</property> 
<property name="connection.driver_class">NHibernate.Driver.MySqlDataDriver</property>