Question

我想使用连接字符串App.Config文件。也可以使用NHibernate连接到2个数据库（不同的连接字符串），如果是这样的话？

Answer 1

问题的第一部分：

<property name="connection.connection_string_name">ConnStringName</property>

然后像往常一样宣布你的<connectionStrings>。 @JMSA错了。

Answer 2

如果保持2个不同的数据库连接，Frederik Gheysels的链接是最好的答案。

AFAIK这不可能使用标准的App.config格式，如：

<强>的App.config

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <configSections>
    </configSections>
    <connectionStrings>
        <add name="ConnString1" connectionString="Data Source=.\SQLEXPRESS;Initial Catalog=NhibernateDB;Integrated Security=True" providerName="System.Data.SqlClient" />
    </connectionStrings>
</configuration>

NHibernate提供了三种读取配置信息的方法：

从App.config文件中读取配置。

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="nhibernate" type="System.Configuration.NameValueSectionHandler, System, Version=1.0.5000.0,Culture=neutral, PublicKeyToken=b77a5c561934e089"/>
  </configSections>

  <!-- NHibernate Configuration -->
  <nhibernate>
    <add key="hibernate.connection.provider" value="NHibernate.Connection.DriverConnectionProvider"/>
    <add key="hibernate.dialect" value="NHibernate.Dialect.MsSql2000Dialect"/>
    <add key="hibernate.connection.driver_class" value="NHibernate.Driver.SqlClientDriver"/>
    <add key="hibernate.connection.connection_string" value="Data Source=(local)\sqlexpress;Initial Catalog=NHibernateDB;user=sa;Password=;Integrated Security=true"/>
  </nhibernate>
</configuration>

改进了从App.config文件中读取配置的方法。

<?xml version="1.0" encoding="utf-8" ?>
<configuration>

  <configSections>
    <section name="hibernate-configuration" type="NHibernate.Cfg.ConfigurationSectionHandler, NHibernate" />
  </configSections>

  <!-- NHibernate Configuration -->
  <hibernate-configuration xmlns="urn:nhibernate-configuration-2.2">
    <session-factory>
      <property name="connection.provider">NHibernate.Connection.DriverConnectionProvider</property>
      <property name="dialect">NHibernate.Dialect.MsSql2005Dialect</property>
      <property name="connection.driver_class">NHibernate.Driver.SqlClientDriver</property>
      <property name="connection.connection_string">Data Source=(local)\sqlexpress;Initial Catalog= NHibernateDB;user=sa;Password=;Integrated Security=True;</property>
<mapping assembly="NHibernate_Test.BO"/>
    </session-factory>
  </hibernate-configuration>
</configuration>

从hibernate.cfg.xml文件中读取配置

的App.config

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
</configuration>

的hibernate.cfg.xml

<?xml version="1.0" encoding="utf-8" ?>    
<hibernate-configuration xmlns="urn:nhibernate-configuration-2.2">
  <session-factory>
    <property name="connection.provider">NHibernate.Connection.DriverConnectionProvider</property>
    <property name="dialect">NHibernate.Dialect.MsSql2000Dialect</property>
    <property name="connection.driver_class">NHibernate.Driver.SqlClientDriver</property>
    <property name="connection.connection_string">Data Source=.\SQLEXPRESS;Initial Catalog=NHibernateDB; user=sa;Password=;Integrated Security=True</property>
    <property name="show_sql">false</property>
    <!--<property name="query.substitutions">true 1, false 0, yes 'Y', no 'N'</property>-->
    <mapping assembly="NHibernate_Test.BO" />
  </session-factory>
</hibernate-configuration>

我建议你在代码中加载配置信息，如下所示：

public sealed class Persister : System.IDisposable
    {
        private NHibernate.ISessionFactory _sessionFactory;


        /// <summary> Configures NHibernate to access the data source and map entities to tables. </summary>
        public Persister()
        {
            System.Console.Out.WriteLine("Configuration of NHibernate...\n");
            const string connectionString = @"Data Source=(local)\sqlexpress;Initial Catalog=nhibernate;Integrated Security=SSPI";

            // Enable the logging of NHibernate operations
            log4net.Config.XmlConfigurator.Configure();

            // Create the object that will hold the configuration settings
            // and fill it with the information to access to the database
            NHibernate.Cfg.Configuration configuration = new NHibernate.Cfg.Configuration();
            configuration.Properties[NHibernate.Cfg.Environment.ConnectionProvider] = "NHibernate.Connection.DriverConnectionProvider";

            System.Console.Out.WriteLine("Use SQL Server database: ConnectionString = <"
                 + connectionString + ">\n");

            // These are the three lines of code to change in order to use another database
            configuration.Properties[NHibernate.Cfg.Environment.Dialect] = "NHibernate.Dialect.MsSql2000Dialect";
            configuration.Properties[NHibernate.Cfg.Environment.ConnectionDriver] = "NHibernate.Driver.SqlClientDriver";
            configuration.Properties[NHibernate.Cfg.Environment.ConnectionString] = connectionString;


            // Use NHibernate.Mapping.Attributes to create mapping information about our entities
            System.Console.Out.WriteLine("Generating the mapping information for NHibernate...\n");
            NHibernate.Mapping.Attributes.HbmSerializer.Default.Validate = true; // Enable validation (optional)
            using (System.IO.MemoryStream stream = NHibernate.Mapping.Attributes.HbmSerializer.Default.Serialize(System.Reflection.Assembly.GetExecutingAssembly()))
            {
                configuration.AddInputStream(stream); // Send the mapping information to NHibernate configuration
            }

            // Create the table in the database for the entity Message
            System.Console.Out.WriteLine("Creating the table in the database for the entity Message...");
            new NHibernate.Tool.hbm2ddl.SchemaExport(configuration).Create(true, true);


            // Build the SessionFactory
            System.Console.Out.WriteLine("\n\nBuilding the session factory, end of the configuration\n\n");
            _sessionFactory = configuration.BuildSessionFactory();
        }


        public void Dispose()
        {
            // Do not forget to close the session factory when you are done with it
            _sessionFactory.Close();
        }

Answer 3

您可以创建多个ISessionFactories;每个要连接的数据库都有一个。

检查this article。

Answer 4

可以使用Fluent NHibernate。您可以使用原始连接字符串，应用程序设置或从connectionStrings部分读取。从connectionStrings部分读取的示例是：

ISessionFactory factory = Fluently.Configure()
    .Mappings(m => m.FluentMappings.AddFromAssemblyOf<MyClass>())
    .Database(MsSqlConfiguration.MsSql2005.ConnectionString(c => c.FromConnectionStringWithKey("connectionStringKey"))
    .BuildSessionFactory();

正如Frederik所提到的，您可以通过配置多个会话工厂来处理多个数据库。

NHibernate在app.config中使用现有的ConnectionStrings

4 个答案: