I'm using CodeConfig as opposed to XML files for Spring.NET using Fluent NHibernate to read/write to the database.
But for transaction management, I still want to use Spring's [Transaction] attribute on my service methods. In XML I would do
<tx:attribute-driven/>
I can get around this by handling the transaction myself like this
public WorkItem SaveWorkItem(WorkItem workItem)
{
using (ITransaction tx = CurrentSession.BeginTransaction())
{
CurrentSession.SaveOrUpdate(workItem);
tx.Commit();
}
return workItem;
}
But is there a CodeConfig-only way of allowing this using an attribute instead, like this:
[Transaction]
public WorkItem SaveWorkItem(WorkItem workItem)
{
CurrentSession.SaveOrUpdate(workItem);
return workItem;
}
Thanks
I have a spring code config example on github for the TransactionAttribute:
https://github.com/gergroen/spring-net-getting-started-guide/blob/master/Spring.Net.GettingStarted/Config/ConfigurationOne.cs
Related
I am working on a legacy non-Spring application, and it is being migrated from Hibernate 3 to Hibernate 5.6.0.Final (latest at this time). I have generally never used Hibernate Event Listeners in my work, so this is quite new to me, and I am studying these in Hibernate 5.
Currently in some test class we have defined the code this way for Hibernate 3:
protected static Configuration createSecuredDatabaseConfig() {
Configuration config = createUnrestrictedDatabaseConfig();
config.setListener("pre-insert", "com.app.server.services.db.eventlisteners.MySecurityHibernateEventListener");
config.setListener("pre-update", "com.app.server.services.db.eventlisteners.MySecurityHibernateEventListener");
config.setListener("pre-delete", "com.app.server.services.db.eventlisteners.MySecurityHibernateEventListener");
config.setListener("pre-load", "com.app.server.services.db.eventlisteners.EkoSecurityHibernateEventListener");
return config;
}
This is obviously no longer valid, and I believe I need to create a Hibernate Integrator, which I have done.
public class MyEventListenerIntegrator implements Integrator {
#Override
public void integrate(Metadata metadata, SessionFactoryImplementor sessionFactory,
SessionFactoryServiceRegistry serviceRegistry) {
EventListenerRegistry eventListenerRegistry = serviceRegistry.getService(EventListenerRegistry.class);
eventListenerRegistry.getEventListenerGroup(EventType.PRE_INSERT).appendListener(new MySecurityHibernateEventListener());
eventListenerRegistry.getEventListenerGroup(EventType.PRE_UPDATE).appendListener(new MySecurityHibernateEventListener());
eventListenerRegistry.getEventListenerGroup(EventType.PRE_DELETE).appendListener(new MySecurityHibernateEventListener());
eventListenerRegistry.getEventListenerGroup(EventType.PRE_LOAD).appendListener(new MySecurityHibernateEventListener());
}
So, now I believe the next step is to add this to the session via the registry builder. I am using this website to help me:
https://www.boraji.com/hibernate-5-event-listener-example
Because we were using older Hibernate 3, we had code to create our session factory as follows:
protected static SessionFactory buildSessionFactory(Database db)
{
if (db == null) {
throw new NullPointerException("Database specifier cannot be null");
}
try {
Configuration config = createSessionFactoryConfiguration(db);
String url = config.getProperty("connection.url");
String user = config.getProperty("connection.username");
String password = config.getProperty("connection.password");
try {
String dbDriver = config.getProperty("hibernate.connection.driver_class");
Class.forName(dbDriver);
Connection conn = DriverManager.getConnection(url, user, password);
}
catch (SQLException error) {
logger.info("Didn't find driver, on QA or production, so it's okay to assume we have DB connection");
error.printStackTrace();
}
SessionFactory sessionFactory = config.buildSessionFactory();
sessionFactoryConfigs.put(sessionFactory, config); // Cannot recover config from factory instance, must be stored.
return sessionFactory;
}
catch (Throwable ex) {
// Make sure you log the exception, as it might be swallowed
logger.error("Initial SessionFactory creation failed.", ex);
throw new ExceptionInInitializerError(ex);
}
}
The link that I referred to above has a much different way of creating the sessionfactory. So, I'll be testing that out to see if it works in our app.
Without Spring handling our sessions and transactions, in this app it is coded by hand the way it was done before Spring, and I haven't seen that kind of code in years.
I solved this issue with the help from the link I provided above. However, I didn't copy exactly what they did, but some of it helped. My solution is as follows:
protected static SessionFactory createSecuredDatabaseConfig() {
Configuration config = createUnrestrictedDatabaseConfig();
BootstrapServiceRegistry bootstrapRegistry =
new BootstrapServiceRegistryBuilder()
.applyIntegrator(new EkoEventListenerIntegrator())
.build();
ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder(bootstrapRegistry).applySettings(config.getProperties()).build();
SessionFactory sessionFactory = config.buildSessionFactory(serviceRegistry);
return sessionFactory;
}
This was it. I tried multiple different ways to register the events without the BootstrapServiceRegistry, but none of those worked. I did have to create the integrator. What I did NOT include was the following:
MetadataSources sources = new MetadataSources(serviceRegistry )
.addPackage("com.myproject.server.model");
Metadata metadata = sources.getMetadataBuilder().build();
// did not create the sessionFactory this way
sessionFactory = metadata.getSessionFactoryBuilder().build();
If I had gone further and use this method to create the sessionFactory, then all of my queries would have been complaining about not being able to find the parameterName, which is something else.
The Hibernate Integrator and this method to create the sessionFactory is all for the unit tests. Without registering these events, one unit test would fail, and now it doesn't. So, this solves my problem for now.
I want to access ISession directly from application services (without using repository (http://ayende.com/blog/3955/repository-is-the-new-singleton)) but application services unit test is hard and Nhibernate data access code increase complexity of code (no repository mock and I don't want to mock repository or in memory db like sqllite for testing)
Is there any efficient way access to ISession from service layer?
I use a sessionHelper which basically holds the ISessionFactory - and then have methods like this:
public T WrapQueryInTransaction<T>(Func<ISession, T> query)
{
using (var tx = Session.BeginTransaction())
{
try
{
var result = query(Session);
tx.Commit();
return result;
}
}
}
I then have similar methods for common functionality - ie. xxxUpdaters which basically loads the object in question, makes the updates and then closes the ISession again.
And then usage is as follows for queries:
var entities = _sessionHelper.WrapQueryInTransaction(s => s.QueryOver<SomeEntity>().List());
For complex queries I have these incapsulated in a query class which can also be thrown at the sessionHelper.
It works for me - hope you can use it.
I've got a method helper in my tests base class that looks like this:
protected TEntity Fetch<TEntity>(Guid id) where TEntity : Entity
{
using (var session = GetSession())
return session.Get<TEntity>(id);
}
So I can call it from an integration test as such:
var persistedFoo = Fetch<Foo>(foo.Id);
How can I set the session in my Fetch method to eager fetch all properties in TEntity?
According to NHibernate docs here you should use NHibernateUtility class, so change your code into something like this should help:
using(var session = GetSession())
{
var entity = session.Get<TEntity>(id);
NHibernateUtil.Initialize(entity);
}
alternatively, you can use one of nHib's querying APIs (I personally prefer QueryOver), to do something like
session.QueryOver<Cat>().Where(cat => cat.Id == id).Fetch(c => c.Kittens).Eager.
This gives you the added bonus of controlling exactly which properties / collections would be fetched.
Also, it's recommended that you do NOT abstract-away your ISession usage in repositories.
It would prevent you from benefiting from such nHibernate features as batching (see ayende's post here)
I am trying to write a test for my NHibernate mappings that will automatically pick up and test any new mappings that get added.
At the moment I have a test that opens a session to a known test database then attempts to load the first entity of each type and asserts that it is not null.
This all works fine but it means that every time I add a new entity mapping, I need to remember to update the test.
So, what I want to do is to inspect the mappings and try to load one of each of the mapped entities, but the NHibernate Configuration object that the sessionfactory is built from is not visible to my test so I was wondering if there is a way to access a list of mapped entities from the session or do I need to expose the original Configuration instead?
You can get SessionFactory from Session and SessionFactory has method GetAllClassMetadata() which returns list of IClassMetadata. And from IClassMetadata you can get MappedClass (GetMappedClass())
But you will need some extra work to get subclasses. This code can help:
var metaData = this.session.SessionFactory.GetClassMetadata(baseClass);
if (metaData != null && metaData.HasSubclasses)
{
foreach (string entityName in ((NHibernate.Persister.Entity.IEntityPersister)metaData).EntityMetamodel.SubclassEntityNames)
{
var metadata = this.session.SessionFactory.GetClassMetadata(entityName);
result.Add(metadata.GetMappedClass(EntityMode.Poco));
}
}
I expose the configuration object and do a mapping that queries all of my entities like this. It will output all errors from each of my mappings.:
[TestMethod()]
public void AllNHibernateMappingsAreOkay()
{
bool failed = false;
log4net.Config.XmlConfigurator.Configure();
using (ISession session = SessionFactory.GetCurrentSession())
{
foreach (var s in SessionFactory.GetConfig().ClassMappings)
{
try
{
SessionFactory.GetCurrentSession().CreateQuery(string.Format("from {0} e", s.MappedClass.Name))
.SetFirstResult(0).SetMaxResults(50).List();
}
catch (Exception ex)
{
failed = true;
log.ErrorFormat("\r\n\r\n {0} \r\n {1} \r\n\r\n", ex.Message, ex.InnerException.Message);
}
}
}
Assert.IsFalse(failed, "One or more mappings have errors in them. Please refer to output or logs.");
}
if you have only one row per entity then you could issue session.QueryOver<object>().List();
Is there any way to set a default value for max_lo that will take effect for all mapped entities? All of my entities are currently mapped via Xml. I know the default is 32678, but I would like to reduce this to 1000.
I've had a look through the NH configuration xsd and I can't see any settings in there. I think that you should be able to achieve this ok if you are mapping by code, but I am currently using Xml and don't fancy changing across.
Thanks.
you can also override the value on SessionFactory generation, which is only done once:
private void InitSessionFactory()
{
var cfg = new Configuration().Configure();
foreach (var cm in cfg.ClassMappings) {
if (cm.Identifier.IsSimpleValue) {
var simpleVal = cm.Identifier as SimpleValue;
if (simpleVal.IdentifierGeneratorStrategy == "hilo"){
simpleVal.IdentifierGeneratorProperties["max_lo"] = "1000";
}
}
}
sessionFactory = cfg.BuildSessionFactory();
}
this NH2 code so for NH3 there might be some differences
No way to configure default/global from hbm. Int16.MaxValue is simply hardcoded in NHibernate (as of 3.2). TableHiLoGenerator source:
public override void Configure(IType type, ...)
{
...
maxLo = PropertiesHelper.GetInt64(MaxLo, parms, Int16.MaxValue);
...
}
I guess you can open feature request here.
It looks like it may be possible to do this by extending the NH hilo generator as per http://daniel.wertheim.se/2011/03/08/nhibernate-custom-id-generator/