Develop Reference

NHibernate MySqlException

I am trying use NHibernate to my MySQL but I have still issue with connection on my localhost database.
Exeptions:
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.
Code:
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>
Configuration is located in ~/bin/debug and Nhibernate can see it but still can not connect to database.
----- Sorry for my English Language.------

By default, shared memory is not enabled on Windows. This may be why your connection is failing.
Remove Protocol=memory; from your connection string to use a regular TCP/IP connection.

nhibernate set custom generator class in mapping file

i try to implement a custom generator class like this:
Creating a custom id generator for nHibernate
This example is in fluent Nhibernate and not what I want exactly. I want it for nhibernate with mapping.
I have the following lines of Code:
namespace webportale_ger_webservice.Routinen
{
public class NextKey : TableGenerator
{
private const Int32 SeedValue = 1048576;
public override object Generate(ISessionImplementor sessionimpl, object obj)
{
var session = NHibernateHelper.GetSession();
int counter = Convert.ToInt32(base.Generate(sessionimpl, obj));
return counter + SeedValue + 1;
}
}
}
Now I want to give this generator class the ID-property of the mapping document, like this:
<hibernate-mapping assembly="webportale ger webservice" namespace="webportale_ger_webservice.Model" xmlns="urn:nhibernate-mapping-2.2">
<class name="SPTPL" table="SPTPL" lazy="false" >
<id name="AR" column="AR" generator="webportale_ger_webservice.Routinen.NextKey"/>
But it doesn't work with generator="webportale_ger_webservice.Routinen.NextKey", the error message is the following:
NHibernate.Id.IdentifierGenerationException: Could not interpret id generator strategy: webportale_ger_webservice.Routinen.NextKey
bei NHibernate.Id.IdentifierGeneratorFactory.GetIdentifierGeneratorClass(String strategy, Dialect dialect)
bei NHibernate.Id.IdentifierGeneratorFactory.Create(String strategy, IType type, IDictionary`2 parms, Dialect dialect)
bei NHibernate.Impl.SessionFactoryImpl..ctor(Configuration cfg, IMapping mapping, Settings settings, EventListeners listeners)
bei NHibernate.Cfg.Configuration.BuildSessionFactory()
bei webportale_ger_webservice.DatabaseInterface.NHibernateHelper..cctor() in C:\Quellen\VSWebNeoBackEnd\VSWebNeoBackEnd\VSWebNeoBackEnd\project india webservice\DatabaseInterface\NHibernateHelper.cs:Zeile 34.
--- Ende der internen Ausnahmestapelüberwachung ---
bei webportale_ger_webservice.DatabaseInterface.NHibernateHelper.GetSession()
bei webportale_ger_webservice.india_webservice.InsertSP_Leistungsort(String vornameStr, String nachnameStr, String strasseStr, String hnrzusatzStr, Int32 hausnrStr, String plzStr, String ortStr, String mailStr, String dateStr, String telStr, String argef, String bemerkungStr, String arstrasse, String arplz) in C:\Quellen\VSWebNeoBackEnd\VSWebNeoBackEnd\VSWebNeoBackEnd\project india webservice\webportale_ger_webservice.asmx.cs:Zeile 382.
Does anyone know how to define the class correctly in mapping documents?
thank you.

In case, we provide a type, it is better to use full type name - mostly including the assembly name. So this should work:
<class name="SPTPL" table="SPTPL" lazy="false" >
//<id name="AR" column="AR" generator="webportale_ger_webservice.Routinen.NextKey"/>
<id name="AR" column="AR" generator="webportale_ger_webservice.Routinen.NextKey,webportale_ger_webservice"/>
Expecting that the assembly name is webportale_ger_webservice

AppDomain.Load() fails with FileNotFoundException

I'm trying to load my plugin dll into separate AppDomain, but Load() method fails with FileNotFoundException. Moreover, it seems like setting PrivateBinPath property of AppDomainSetup has no effect, because in log I see "Initial PrivatePath = NULL". All plugin have strong name. Normally each plugin is stored in [Application startp path]\postplugins\[plugindir]. If I put plugins subdirectories under [Application startp path] directory, everything works. I also have tried to change AppBase property manually but it does not change.
Here is the code:
public void LoadPostPlugins(IPluginsHost host, string pluginsDir)
{
_Host = host;
var privatePath = "";
var paths = new List<string>();
//build PrivateBinPath
var dirs = new DirectoryInfo(pluginsDir).GetDirectories();
foreach (var d in dirs)
{
privatePath += d.FullName;
privatePath += ";";
}
if (privatePath.Length > 1) privatePath = privatePath.Substring(0, privatePath.Length - 1);
//create new domain
var appDomainSetup = new AppDomainSetup { PrivateBinPath = privatePath };
Evidence evidence = AppDomain.CurrentDomain.Evidence;
var sandbox = AppDomain.CreateDomain("sandbox_" + Guid.NewGuid(), evidence, appDomainSetup);
try
{
foreach (var d in dirs)
{
var files = d.GetFiles("*.dll");
foreach (var f in files)
{
try
{
//try to load dll - here I get FileNotFoundException
var ass = sandbox.Load(AssemblyName.GetAssemblyName(f.FullName));
var f1 = f;
paths.AddRange(from type in ass.GetTypes()
select type.GetInterface("PluginsCore.IPostPlugin")
into iface
where iface != null
select f1.FullName);
}
catch (FileNotFoundException ex)
{
Debug.WriteLine(ex);
}
}
}
}
finally
{
AppDomain.Unload(sandbox);
}
foreach (var plugin in from p in paths
select Assembly.LoadFrom(p)
into ass
select
ass.GetTypes().FirstOrDefault(t => t.GetInterface("PluginsCore.IPostPlugin") != null)
into type
where type != null
select (IPostPlugin)Activator.CreateInstance(type))
{
plugin.Init(host);
plugin.GotPostsPartial += plugin_GotPostsPartial;
plugin.GotPostsFull += plugin_GotPostsFull;
plugin.PostPerformed += plugin_PostPerformed;
_PostPlugins.Add(plugin);
}
}
And here is the log:
'FBTest.vshost.exe' (Managed (v4.0.30319)): Loaded 'D:\VS2010Projects\PNotes - NET\pnfacebook\FBTest\bin\Debug\postplugins\pnfacebook\pnfacebook.dll', Symbols loaded.
A first chance exception of type 'System.IO.FileNotFoundException' occurred in FBTest.exe
System.IO.FileNotFoundException: Could not load file or assembly 'pnfacebook, Version=1.0.0.0, Culture=neutral, PublicKeyToken=9e2a2192d22aadc7' or one of its dependencies. The system cannot find the file specified.
File name: 'pnfacebook, Version=1.0.0.0, Culture=neutral, PublicKeyToken=9e2a2192d22aadc7'
at System.Reflection.RuntimeAssembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)
at System.Reflection.RuntimeAssembly.nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)
at System.Reflection.RuntimeAssembly.InternalLoadAssemblyName(AssemblyName assemblyRef, Evidence assemblySecurity, RuntimeAssembly reqAssembly, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)
at System.Reflection.RuntimeAssembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean forIntrospection)
at System.Reflection.RuntimeAssembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection)
at System.Reflection.Assembly.Load(String assemblyString)
at System.UnitySerializationHolder.GetRealObject(StreamingContext context)
at System.AppDomain.Load(AssemblyName assemblyRef)
at PNotes.NET.PNPlugins.LoadPostPlugins(IPluginsHost host, String pluginsDir) in D:\VS2010Projects\PNotes - NET\pnfacebook\FBTest\PNPlugins.cs:line 71
=== Pre-bind state information ===
LOG: User = ANDREYHP\Andrey
LOG: DisplayName = pnfacebook, Version=1.0.0.0, Culture=neutral, PublicKeyToken=9e2a2192d22aadc7
(Fully-specified)
LOG: Appbase = file:///D:/VS2010Projects/PNotes - NET/pnfacebook/FBTest/bin/Debug/
LOG: Initial PrivatePath = NULL
Calling assembly : (Unknown).
===
LOG: This bind starts in default load context.
LOG: No application configuration file found.
LOG: Using host configuration file:
LOG: Using machine configuration file from C:\Windows\Microsoft.NET\Framework\v4.0.30319\config\machine.config.
LOG: Post-policy reference: pnfacebook, Version=1.0.0.0, Culture=neutral, PublicKeyToken=9e2a2192d22aadc7
LOG: Attempting download of new URL file:///D:/VS2010Projects/PNotes - NET/pnfacebook/FBTest/bin/Debug/pnfacebook.DLL.
LOG: Attempting download of new URL file:///D:/VS2010Projects/PNotes - NET/pnfacebook/FBTest/bin/Debug/pnfacebook/pnfacebook.DLL.
LOG: Attempting download of new URL file:///D:/VS2010Projects/PNotes - NET/pnfacebook/FBTest/bin/Debug/pnfacebook.EXE.
LOG: Attempting download of new URL file:///D:/VS2010Projects/PNotes - NET/pnfacebook/FBTest/bin/Debug/pnfacebook/pnfacebook.EXE.

when you load an assembly into the AppDomain in that way, it is the current AppDomain's PrivateBinPath that is used to find the assembly.
For your example, when I added the following to my App.config it ran fine:
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<probing privatePath="[PATH_TO_PLUGIN]"/>
</assemblyBinding>
</runtime>
This is not very useful to you though.
What I did instead was to create a new assembly that contained the IPostPlugin and IPluginsHost interfaces, and also a class called Loader that looked like this:
public class Loader : MarshalByRefObject
{
public IPostPlugin[] LoadPlugins(string assemblyName)
{
var assemb = Assembly.Load(assemblyName);
var types = from type in assemb.GetTypes()
where typeof(IPostPlugin).IsAssignableFrom(type)
select type;
var instances = types.Select(
v => (IPostPlugin)Activator.CreateInstance(v)).ToArray();
return instances;
}
}
I keep that new assembly in the application root, and it doesn't need to exist in the plugin directories (it can but won't be used as the application root will be searched first).
Then in the main AppDomain I did this instead:
sandbox.Load(typeof(Loader).Assembly.FullName);
Loader loader = (Loader)Activator.CreateInstance(
sandbox,
typeof(Loader).Assembly.FullName,
typeof(Loader).FullName,
false,
BindingFlags.Public | BindingFlags.Instance,
null,
null,
null,
null).Unwrap();
var plugins = loader.LoadPlugins(AssemblyName.GetAssemblyName(f.FullName).FullName);
foreach (var p in plugins)
{
p.Init(this);
}
_PostPlugins.AddRange(plugins);
So I create an instance of the known Loader type, and then get that to create the plugin instances from within the plug-in AppDomain. That way the PrivateBinPaths are used as you want them to be.
One other thing, the private bin paths can be relative so rather than adding d.FullName you could add pluginsDir + Path.DirectorySeparatorChar + d.Name to keep the final path list short. That's just my personal preference though! Hope this helps.

Thanks a lot to DedPicto and James Thurley ; I was able to implement a complete solution, I posted in this post.
I had the same problem as Emil Badh : if you try to return from "Loader" class an interface that represents a concrete class that is unknown in current AppDomain, you get a "Serialization Exception".
It is because the concrete type tries to be deserialized.
The solution: I was able to return from "Loader" class a concrete type of a "custom proxy" and it works. See referenced post for details :
// Our CUSTOM PROXY: the concrete type which will be known from main App
[Serializable]
public class ServerBaseProxy : MarshalByRefObject, IServerBase
{
private IServerBase _hostedServer;
/// <summary>
/// cstor with no parameters for deserialization
/// </summary>
public ServerBaseProxy ()
{
}
/// <summary>
/// Internal constructor to use when you write "new ServerBaseProxy"
/// </summary>
/// <param name="name"></param>
public ServerBaseProxy(IServerBase hostedServer)
{
_hostedServer = hostedServer;
}
public string Execute(Query q)
{
return(_hostedServer.Execute(q));
}
}
This proxy could be returned and use as if it was the real concrete type !

How to use NHibernate with both MySQL server and Microsoft SQL server 2008

How can I configure NHibernate to connect to both a MySQLserver and a Microsoft SQL server 2008? I do want to copy data from one server to another. I heard of NHibernate shared.

I've struggled quite a bit few months ago.
My problem was with MS Sql Server and Oracle.
What I've done is to create two separate config files for 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>
I use this simple class to build my 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());
}
}
As you can see I pass to my NHibernateSessionFactory a connection string (I prefer to save it in my app config file) and the name (without the path) of the nhibernate config file.
I personally use a DI container (StructureMap) and you can achieve something very cool defining a registry class:
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");
}
}
in which you can use named instances.
My services layer than uses a StructureMap registry class where you can define the constructors:
this.For<IOrdersService>()
.HybridHttpOrThreadLocalScoped()
.Use<OrdersService>()
.Ctor<ISession>("sessionMDII").Is(x => x.TheInstanceNamed("OracleSession"))
.Ctor<ISession>("sessionSpedizioni").Is(x => x.TheInstanceNamed("MsSqlSession"));
For your Service implementation:
public class OrdersService : IOrdersService
{
private readonly ISession SessionMDII;
private readonly ISession SessionSpedizioni;
public OrdersService(ISession sessionMDII, ISession sessionSpedizioni)
{
this.SessionMDII = sessionMDII;
this.SessionSpedizioni = sessionSpedizioni;
}
...
}

It's not clear what your use case is, but you will simply need to create 2 session factories. One will use your mySQL dialect, connection string, etc... and the other will use the SQL Server equivalents.
Just avoid including any custom SQL in your mappings and this should work fine.

Could not create the driver from NHibernate.Driver.OracleDataClientDriver

Here's the code raising the exception:
public static class NHibernateSessionManager
{
private static ISessionFactory sessionFactory = new Configuration().Configure().BuildSessionFactory();
public static ISession GetSession(string clientId)
{
if (ContextSession == null)
ContextSession = sessionFactory.OpenSession(new OracleIntercerptor(clientId.ToUpper()));
else
((OracleConnection)ContextSession.Connection).ClientId = clientId;
return ContextSession;
}
// - snip -
}
and the call to the code where the exception is raised:
private ISession NHibernateSession
{
get
{
return NHibernateSessionManager.GetSession(SessionWrapper.GetUser());
}
}
I get a TypeInitializationException
{"The type initializer for
'Sigaf.Presupuesto.EntidadesDAL.NHibernate.NHibernateSessionManager'
threw an exception."}
With an inner exception of
{"Could not create the driver from
NHibernate.Driver.OracleDataClientDriver."}
A few more inner exceptions lead me to a NRE:
Object reference not set to an
instance of an object.
at
NHibernate.Driver.OracleDataClientDriver..ctor()
NHibernate v3.0
Target Framework v4.0
This code implementation is working for other, similar, solutions.
Oh, the Hibernate.config file:
<?xml version="1.0"?>
<hibernate-configuration xmlns="urn:nhibernate-configuration-2.2">
<session-factory>
<property name="connection.provider">NHibernate.Connection.DriverConnectionProvider</property>
<property name="dialect">NHibernate.Dialect.Oracle10gDialect</property>
<property name="current_session_context_class">web</property>
<property name="proxyfactory.factory_class">NHibernate.ByteCode.LinFu.ProxyFactoryFactory, NHibernate.ByteCode.LinFu</property>
<property name="connection.driver_class">NHibernate.Driver.OracleDataClientDriver</property>
<property name="connection.connection_string_name">Sigaf</property>
<property name="default_schema">PRE</property>
<property name="show_sql">true</property>
<mapping assembly="Sigaf.Presupuesto.EntidadesDAL" />
</session-factory>
</hibernate-configuration>

Make sure the actual Oracle driver is in your application bin folder.
In Visual Studio you should add a reference to Oracle.DataAcess.dll in your project for example.
Select the DLL => Right click it => In the Properties grid select Copy Local = True.
This should solve your problem.