What should you do when creating a nhibernate session?

You should observe the following practices when creating NHibernate Sessions: Never create more than one concurrent ISession or ITransaction instance per database connection. Be extremely careful when creating more than one ISession per database per transaction.
Moreover, what is the NHibernate session in Stack Overflow?
The NHibernate session encapsulates a unit of work as specified by the unit of work pattern. Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question.
Also, which is the unit of work container in NHibernate? In NHibernate we have the Session object which is a Unit of Work (UoW) container. The session object keeps track of all objects you load, new objects you add, existing objects you delete and changes you make to any of these objects.
In this manner, how to create a new instance of NHibernate?
The first line of the test method creates a new instance of the NHibernate configuration class. This class is used to configure NHibernate. In the second line we tell NHibernate to configure itself. NHibernate will look out for configuration information since we do not provide any information here in the test method.
Thereof, do you need to worry about concurrency in NHibernate?
This approach leaves NHibernate and the database to worry about concurrency. The application never needs to synchronize on any business object, as long as it sticks to a single thread per ISession or object identity (within an ISession the application may safely use == to compare objects). 12.4. Optimistic concurrency control

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What is nhibernate session exactly?

NHibernate session is a gateway for all operations that you perform on your datastore . It also plays a role of the first-level cache, minimizing the number of roundtrips between your application and the database server.

Can a mapping document be generated in nhibernate?

Note that, even though many NHibernate users choose to define XML mappings by hand, a number of tools exist to generate the mapping document, even transparently at runtime.

Do you need to worry about concurrency in nhibernate?

This approach leaves NHibernate and the database to worry about concurrency. The application never needs to synchronize on any business object, as long as it sticks to a single thread per ISession or object identity (within an ISession the application may safely use == to compare objects). 12.4. Optimistic concurrency control

Which is the best query api for nhibernate?

HQL is extremely powerful but some people prefer to build queries dynamically, using an object oriented API, rather than embedding strings in their .NET code. For these people, NHibernate provides an intuitive ICriteria query API. If you are uncomfortable with SQL-like syntax, this is perhaps the easiest way to get started with NHibernate.

What do you need to know about nhibernate?

5 Answers 5. NHibernate is an ORM, or Object-Relational Mapper. In the same line as LINQ to SQL, Entity Framework, LLBLGen, and others, ORM tools remove most of the need to write stored procedures to handle common data access (CRUD) for your business objects.

When does the next version of nhibernate come out?

NHibernate 5.0 was released on October 10, 2017. It provides support for asynchronous programming. This version requires .NET Framework 4.6.1 or later. NHibernate 5.1 was released on March 17, 2018. It supports .NET Standard 2.0 and .NET Core 2.0. NHibernate 5.2 was released on December 4, 2018. NHibernate 5.3 was released on July 19, 2020.

How is the nhibernate profiler used in linq?

Implementation of LINQ has allowed Language Integrated Query use with NHibernate. The NHibernate Profiler is an Object–Relational Mapping tool (ORM) that serves as a real-time visual debugger for NHibernate. It identifies inefficient SQL data queries to eliminate unnecessary work by the database to boost overall performance of the application.

How do i create a project in nhibernate?

Step 2 − A new Project dialog opens. Step 3 − From the left pane, select Templates → Visual C# → Windows. Step 4 − In the middle pane, select Console Application. Step 5 − Enter the project name, ‘NHibernateDemoApp’, in the Name field and click Ok to continue.

Is the nhibernate profiler an open source tool?

As open source software, NHibernate has received many contributions from its users. Implementation of LINQ has allowed Language Integrated Query use with NHibernate. The NHibernate Profiler is an Object–Relational Mapping tool (ORM) that serves as a real-time visual debugger for NHibernate.

Can you use nullable foreign keys in nhibernate?

Nullable foreign keys are not considered to be good practice in traditional data modelling, so our examples do not use nullable foreign keys. This is not a requirement of NHibernate, and the mappings will work if you drop the nullability constraints.

Can a class be mapped more than once in nhibernate?

entity-name (optional - defaults to the class name): NHibernate allows a class to be mapped multiple times, potentially to different tables. See Section 5.3, “Mapping a class more than once” . It also allows entity mappings that are represented by dictionaries at the .Net level.

Which is nhibernate strategy to use for property access?

default-access (optional - defaults to property): The strategy NHibernate should use for accessing a property value. It can be a custom implementation of IPropertyAccessor . default-lazy (optional - defaults to true ): The default value for unspecified lazy attributes of class and collection mappings.

What does the optional proxy attribute do in nhibernate?

The optional proxy attribute enables customization of the generated proxy for lazy initialization of persistent instances of the class: by default, the proxy derives from the class. Specifying an interface causes the proxy to implement it and to use System.Object as its base class.

Is there such a thing as lazy loading in nhibernate?

It is an entirely different concept by default and NHibernate doesn't have lazy loading, for example if you load a customer, it's not going to load all of the orders. The order collection will be loaded on demand.

How to initialize related objects in nhibernate class?

If you know you need have access to related objects of the order entity you can use the NHibernateUtil class to initialize the related objects (that is: to fetch them from the database). Have a look at this test methods With this utility class you can initialize single objects as well as collection of objects.

Which is the default behavior in nhibernate 1.2?

It is recommended for maximum flexibility to define all relations in your domain as lazy loadable. This is the default behavior of NHibernate since version 1.2. But this can lead to some undesired effects if querying your data. Let's discuss these effects and how to avoid them.

Can you tell nhibernate to eagerly load all order lines?

If you know that you want to load all order items of a given order then you can tell NHibernate to do so and eagerly load all order lines together with the order in one go. The following test method shows how you can formulate a HQL query which not only loads the order but also the associated customer and order lines.

Does nhibernate work with .net core?

NHibernate works with ASP.NET Core too. This blog post shows how to use NHibernate in ASP.NET Core MVC applications. I was pleasantly suprised seeing that NHibernate is now on .NET Standard and it doesn't come with any secret dependencies to full .NET Framework or some Windows-only library.

Is there a select n + 1 issue in nhibernate?

Using an O/RM can greatly simplify your life, but is has its on set of Gotcha that you need to be aware of. One of the more serious ones is the Select N + 1 issue. To describe the issue, let's look at a typical example. Users  א M:M  א Blogs א 1:M א Posts א 1:M א Comments. Here is the diagram:

How is nhibernate used in the.net framework?

Designed to serve as a persistence layer exclusively for the .Net framework based on Object-Relational Mapping Technique. A tool that creates a "virtual representation" of database objects within the code. Used to solve the problem of impedance mismatch between Class and relational databases and tables.