Sådan bruger du NHibernate med både MySQL-server og Microsoft SQL-server 2008

Jeg har kæmpet for en del måneder siden. Mit problem var med MS SQL Server og Oracle.

Det, jeg har gjort, er at oprette to separate konfigurationsfiler til nhibernate:

sql.nhibernate.config

<?xml version="1.0" encoding="utf-8"?>
    <hibernate-configuration xmlns="urn:nhibernate-configuration-2.2">
      <reflection-optimizer use="false" />
      <session-factory name="BpSpedizioni.MsSql">
        <property name="connection.provider">NHibernate.Connection.DriverConnectionProvider</property>
        <property name="connection.driver_class">NHibernate.Driver.SqlClientDriver</property>
        <property name="dialect">NHibernate.Dialect.MsSql2008Dialect</property>
        <!-- <property name="connection.connection_string">Data Source=(local); Initial Catalog=NHibernate; Trusted_Connection=true;</property> -->
        <property name="current_session_context_class">web</property>
        <property name="adonet.batch_size">100</property>
        <property name="command_timeout">120</property>
        <property name="max_fetch_depth">3</property>
        <property name='prepare_sql'>true</property>
        <property name="query.substitutions">true 1, false 0, yes 'Y', no 'N'</property>
        <property name='proxyfactory.factory_class'>NHibernate.ByteCode.Castle.ProxyFactoryFactory, NHibernate.ByteCode.Castle</property>
        <mapping assembly="BpSpedizioni.Services"/>
      </session-factory>
</hibernate-configuration>

ora.nhibernate.config

<?xml version="1.0" encoding="utf-8"?>
<hibernate-configuration xmlns="urn:nhibernate-configuration-2.2">
  <reflection-optimizer use="false" />
  <session-factory name="BpSpedizioni.Oracle">
    <property name="connection.provider">NHibernate.Connection.DriverConnectionProvider</property>
    <property name="connection.driver_class">NHibernate.Driver.OracleDataClientDriver</property>
    <property name="dialect">NHibernate.Dialect.Oracle10gDialect</property>
    <!-- <property name="connection.connection_string">Data Source=(local); Initial Catalog=NHibernate; Trusted_Connection=true;</property> -->
    <property name="current_session_context_class">web</property>
    <property name="adonet.batch_size">100</property>
    <property name="command_timeout">120</property>
    <property name="max_fetch_depth">3</property>
    <property name='prepare_sql'>true</property>
    <property name="query.substitutions">true 1, false 0, yes 'Y', no 'N'</property>
    <property name='proxyfactory.factory_class'>NHibernate.ByteCode.Castle.ProxyFactoryFactory, NHibernate.ByteCode.Castle</property>
    <mapping assembly="BpSpedizioni.Services"/>
  </session-factory>
</hibernate-configuration>

Jeg bruger denne enkle klasse til at bygge min nhibernate SessionFactory:

    public class NHibernateSessionFactory
    {
        private ISessionFactory sessionFactory;

        private readonly string ConnectionString = "";
        private readonly string nHibernateConfigFile = "";

        public NHibernateSessionFactory(String connectionString, string nHConfigFile)
        {
            this.ConnectionString = connectionString;
            this.nHibernateConfigFile = nHConfigFile;
        }

        public ISessionFactory SessionFactory
        {
            get { return sessionFactory ?? (sessionFactory = CreateSessionFactory()); }
        }

        private ISessionFactory CreateSessionFactory()
        {
            Configuration cfg;
            cfg = new Configuration().Configure(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, this.nHibernateConfigFile));

            // With this row below Nhibernate searches for the connection string inside the App.Config.
            // cfg.SetProperty(NHibernate.Cfg.Environment.ConnectionStringName, System.Environment.MachineName);
            cfg.SetProperty(NHibernate.Cfg.Environment.ConnectionString, this.ConnectionString);

#if DEBUG
            cfg.SetProperty(NHibernate.Cfg.Environment.GenerateStatistics, "true");
            cfg.SetProperty(NHibernate.Cfg.Environment.ShowSql, "true");
#endif

            return (cfg.BuildSessionFactory());
        }
    }

Som du kan se, sender jeg en forbindelsesstreng til min NHibernateSessionFactory (jeg foretrækker at gemme den i min app-konfigurationsfil) og navnet (uden stien) på nhibernate-konfigurationsfilen.

Jeg bruger personligt en DI-beholder (StructureMap), og du kan opnå noget meget cool ved at definere en registreringsklasse:

public class NhibernateRegistry : Registry
{
    public NhibernateRegistry()
    {

        For<ISessionFactory>()
        .Singleton()
        .Add(new NHibernateSessionFactory(<oracle connection string>, "ora.nhibernate.config").SessionFactory)
        .Named("OracleSF");

        For<ISession>()
        .HybridHttpOrThreadLocalScoped()
        .Add(o => o.GetInstance<ISessionFactory>("OracleSF").OpenSession())
        .Named("OracleSession");

        For<ISessionFactory>()
        .Singleton()
        .Add(new NHibernateSessionFactory(<ms sql connection string>, "sql.nhibernate.config").SessionFactory)
        .Named("MsSqlSF");

        For<ISession>()
        .HybridHttpOrThreadLocalScoped()
        .Add(o => o.GetInstance<ISessionFactory>("MsSqlSF").OpenSession())
        .Named("MsSqlSession");
    }
}

hvor du kan bruge navngivne forekomster. Mit servicelag bruger end en StructureMap-registreringsklasse, hvor du kan definere konstruktørerne:

this.For<IOrdersService>()
     .HybridHttpOrThreadLocalScoped()
     .Use<OrdersService>()
     .Ctor<ISession>("sessionMDII").Is(x => x.TheInstanceNamed("OracleSession"))
     .Ctor<ISession>("sessionSpedizioni").Is(x => x.TheInstanceNamed("MsSqlSession"));

Til din serviceimplementering:

public class OrdersService : IOrdersService
{
        private readonly ISession SessionMDII;
        private readonly ISession SessionSpedizioni;

        public OrdersService(ISession sessionMDII, ISession sessionSpedizioni)
        {
            this.SessionMDII = sessionMDII;
            this.SessionSpedizioni = sessionSpedizioni;
        }

    ...
}