c# - NHibernate MySqlException

Question

我正在尝试使用 NHibernate 来连接我的 MySQL，但本地主机数据库的连接仍然存在问题。

异常(exception):

MySql.Data.MySqlClient.MySqlException
  HResult=0x80004005
  Message=Unable to connect to any of the specified MySQL hosts.
  Source=MySql.Data
  StackTrace:
   at MySql.Data.MySqlClient.NativeDriver.Open()
   at MySql.Data.MySqlClient.Driver.Open()
   at MySql.Data.MySqlClient.Driver.Create(MySqlConnectionStringBuilder settings)
   at MySql.Data.MySqlClient.MySqlPool.CreateNewPooledConnection()
   at MySql.Data.MySqlClient.MySqlPool.GetPooledConnection()
   at MySql.Data.MySqlClient.MySqlPool.TryToGetDriver()
   at MySql.Data.MySqlClient.MySqlPool.GetConnection()
   at MySql.Data.MySqlClient.MySqlConnection.Open()
   at NHibernate.Connection.DriverConnectionProvider.GetConnection()
   at NHibernate.Tool.hbm2ddl.SuppliedConnectionProviderConnectionHelper.Prepare()
   at NHibernate.Tool.hbm2ddl.SchemaMetadataUpdater.GetReservedWords(Dialect dialect, IConnectionHelper connectionHelper)
   at NHibernate.Tool.hbm2ddl.SchemaMetadataUpdater.Update(ISessionFactoryImplementor sessionFactory)
   at NHibernate.Impl.SessionFactoryImpl..ctor(Configuration cfg, IMapping mapping, Settings settings, EventListeners listeners)
   at NHibernate.Cfg.Configuration.BuildSessionFactory()
   at TestE.Model.NHibernateHelper.get_Session() in C:\Users\hajek\source\repos\TestE\TestE\NHibernateHelper.cs:line 24
   at TestE.Dao.DaoBase1..ctor() in C:\Users\hajek\source\repos\TestE\TestE\Dao\DaoBase.cs:line 20
   at TestE.Dao.ItemDao..ctor() in C:\Users\hajek\source\repos\TestE\TestE\Dao\ItemDao.cs:line 13
   at TestE.Program.Main(String[] args) in C:\Users\hajek\source\repos\TestE\TestE\Program.cs:line 16
Inner Exception 1:
WaitHandleCannotBeOpenedException: No handle of the given name exists.

代码:

namespace TestE.Model
{
    public class NHibernateHelper
    {
        private static ISessionFactory factory;
        private static MySqlConnectionStringBuilder conn_string = new MySqlConnectionStringBuilder();
        public static ISession Session
        {
            get
            {
                if (factory == null)
                {
                    Configuration cfg = new Configuration();
                    factory = cfg.Configure("hibernate.cfg.xml").BuildSessionFactory();

                }

                return factory.OpenSession();
            }
        }



    }
}

hibernate.cfg.xml:

<?xml version="1.0" encoding="utf-8"?>
<!-- 
This template was written to work with NHibernate.Test.
Copy the template to your NHibernate.Test project folder and rename it in hibernate.cfg.xml and change it 
for your own use before compile tests in VisualStudio.
-->
<hibernate-configuration  xmlns="urn:nhibernate-configuration-2.2" >
  <session-factory name="TestE">
    <property name="connection.driver_class">NHibernate.Driver.MySqlDataDriver</property>
    <property name="connection.connection_string">
      Database=todo_list;Data Source=localhost;User Id=root;Password=root;
      Protocol=memory;Old Guids=True;
    </property>
    <property name="dialect">NHibernate.Dialect.MySQL5Dialect</property>
  </session-factory>
</hibernate-configuration>

配置位于~/bin/debug中，Nhibernate可以看到它，但仍然无法连接到数据库。

-----对不起我的英语语言。-----

Answer 1

默认情况下，共享内存 is not enabled在 Windows 上。这可能就是您的连接失败的原因。

从连接字符串中删除 Protocol=memory; 以使用常规 TCP/IP 连接。