Sunday, September 29, 2013

Getting Started with NHibernate and ASP.NET MVC- CRUD Operations

In this post we are going to learn how we can use NHibernate in ASP.NET MVC application.

What is NHibernate:


Nhibernate
ORMs(Object Relational Mapper) are quite popular this days. ORM is a mechanism to map database entities to Class entity objects without writing a code for fetching data and write some SQL queries. It automatically generates SQL Query for us and fetch data behalf on us.

NHibernate is also a kind of Object Relational Mapper which is a port of popular Java ORM Hibernate. It provides a framework for mapping an domain model classes to a traditional relational databases. Its give us freedom of writing repetitive ADO.NET code as this will be act as our database layer. Let’s get started with NHibernate.

How to download:


There are two ways you can download this ORM. From nuget package and from the source forge site.
  1. Nuget - http://www.nuget.org/packages/NHibernate/
  2. Source Forge-http://sourceforge.net/projects/nhibernate/

Creating a table for CRUD:


I am going to use SQL Server 2012 express edition as a database. Following is a table with four fields Id, First Name, Last name, Designation.

NhibernateASPNETMVCTable

Creating ASP.NET MVC project for NHibernate:


Let’s create a ASP.NET MVC project for NHibernate via click on File-> New Project –> ASP.NET MVC 4 web application.

NhibernateASPNETMVCProject

Installing NuGet package for NHibernate:


I have installed nuget package from Package Manager console via following Command.

NhibernateNugetPackage

It will install like following.

PackageManagerConsoleNhibernate

NHibertnate configuration file:


Nhibernate needs one configuration file for setting database connection and other details. You need to create a file with ‘hibernate.cfg.xml’ in model Nhibernate folder of your application with following details.
<?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="connection.driver_class">
      NHibernate.Driver.SqlClientDriver
    </property>
    <property name="connection.connection_string">
      Server=(local);database=LocalDatabase;Integrated Security=SSPI;
    </property>
    <property name="dialect">
      NHibernate.Dialect.MsSql2012Dialect
    </property>
  </session-factory>
</hibernate-configuration>

Here you have got different settings for NHibernate. You need to selected driver class, connection provider as per your database. If you are using other databases like Orcle or MySQL you will have different configuration. ThisNHibernate ORM can work with any databases.

Creating a model class for NHibernate:


Now it’s time to create model class for our CRUD operations. Following is a code for that. Property name is identical to database table columns.
namespace NhibernateMVC.Models
{
    public class Employee
    {
        public virtual int Id { get; set; }
        public virtual string FirstName { get; set; }
        public virtual string LastName { get; set; }
        public virtual string Designation { get; set; }
    }
}

Creating a mapping file between class and table:



Now we need a xml mapping file between class and model with name “Employee.hbm.xml” like following in Nhibernate folder.
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" auto-import="true" assembly="NhibernateMVC" namespace="NhibernateMVC.Models">
  <class name="Employee" table="Employee" dynamic-update="true" >
    <cache usage="read-write"/>
    <id name="Id" column="Id" type="int">
      <generator class="native" />
    </id>
    <property name="FirstName" />
    <property name="LastName" />
    <property name="Designation" />
  </class>
</hibernate-mapping>

Creating a class to open session for NHibernate:


I have created a class in models folder called NHIbernateSession and a static function it to open a session for NHibertnate.
using System.Web;
using NHibernate;
using NHibernate.Cfg;

namespace NhibernateMVC.Models
{
    public class NHibertnateSession
    {
        public static ISession OpenSession()
        {
            var configuration = new Configuration();
            var configurationPath = HttpContext.Current.Server.MapPath(@"~\Models\Nhibernate\hibernate.cfg.xml");
            configuration.Configure(configurationPath);
            var employeeConfigurationFile = HttpContext.Current.Server.MapPath(@"~\Models\Nhibernate\Employee.hbm.xml");
            configuration.AddFile(employeeConfigurationFile);
            ISessionFactory sessionFactory = configuration.BuildSessionFactory();
            return sessionFactory.OpenSession();
        }
    }
}

Listing:


Now we have our open session method ready its time to write controller code to fetch data from the database. Following is a code for that.
using System;
using System.Web.Mvc;
using NHibernate;
using NHibernate.Linq;
using System.Linq;
using NhibernateMVC.Models;

namespace NhibernateMVC.Controllers
{
    public class EmployeeController : Controller
    {

        public ActionResult Index()
        {
            using (ISession session = NHibertnateSession.OpenSession())
            {
                var employees = session.Query<Employee>().ToList();
                return View(employees);
            }
           
        }
    }
}

Here you can see I have get a session via OpenSession method and then I have queried database for fetching employee database. Let’s create a new for this you can create this via right lick on view on above method.We are going to create a strongly typed view for this.

Getting Started with NHibernate and asp.net mvc

Our listing screen is ready once you run project it will fetch data as following.

EmployeeListingusingNhibernateandaspnetmvc

Create/Add:


Now its time to write add employee code. Following is a code I have written for that. Here I have used session.save method to save new employee. First method is for returning a blank view and another method with HttpPost attribute will save the data into the database.
public ActionResult Create()
{
    return View();
}

      
[HttpPost]
public ActionResult Create(Employee emplolyee)
{
    try
    {
        using (ISession session = NHibertnateSession.OpenSession())
        {
            using (ITransaction transaction = session.BeginTransaction())
            {
                session.Save(emplolyee);
                transaction.Commit();
            }
        }

        return RedirectToAction("Index");
    }
    catch(Exception exception)
    {
        return View();
    }
}

Now let’s create a create view strongly typed view via right clicking on view and add view.

AddViewwithNhibertnateandaspnetmvc

Once you run this application and click on create new it will load following screen.

AddViewScreenwithNhibernateandaspnetmvc

Edit/Update:


Now let’s create a edit functionality with NHibernate and ASP.NET MVC. For that I have written two action result method once for loading edit view and another for save data. Following is a code for that.
public ActionResult Edit(int id)
{
    using (ISession session = NHibertnateSession.OpenSession())
    {
        var employee = session.Get<Employee>(id);
        return View(employee);
    }
   
}


[HttpPost]
public ActionResult Edit(int id, Employee employee)
{
    try
    {
        using (ISession session = NHibertnateSession.OpenSession())
        {
            var employeetoUpdate = session.Get<Employee>(id);

            employeetoUpdate.Designation = employee.Designation;
            employeetoUpdate.FirstName = employee.FirstName;
            employeetoUpdate.LastName = employee.LastName;

            using (ITransaction transaction = session.BeginTransaction())
            {
                session.Save(employeetoUpdate);
                transaction.Commit();
            }
        }
        return RedirectToAction("Index");
    }
    catch
    {
        return View();
    }
}

Here in first action result I have fetched existing employee via get method of NHibernate session and in second I have fetched and changed the current employee with update details. You can create view for this via right click –>add view like below. I have created a strongly typed view for edit.

EditViewwithNhibernateandaspnetmvc

Once you run code it will look like following.

EditViewScreenwithNhibernateandaspnetmvc

Details:


Now it’s time to create a detail view where user can see the employee detail. I have written following logic for details view.
public ActionResult Details(int id)
      {
          using (ISession session = NHibertnateSession.OpenSession())
          {
              var employee = session.Get<Employee>(id);
              return View(employee);
          }
      }

You can add view like following via right click on actionresult view.

Detailsviewwithnhibernateandaspnetmvc

now once you run this in browser it will look like following.

Delete:


Now its time to write delete functionality code. Following code I have written for that.
public ActionResult Delete(int id)
{
    using (ISession session = NHibertnateSession.OpenSession())
    {
        var employee = session.Get<Employee>(id);
        return View(employee);
    }
}

       
[HttpPost]
public ActionResult Delete(int id, Employee employee)
{
    try
    {
        using (ISession session = NHibertnateSession.OpenSession())
        {
            using (ITransaction transaction = session.BeginTransaction())
            {
                session.Delete(employee);
                transaction.Commit();
            }
        }
        return RedirectToAction("Index");
    }
    catch(Exception exception)
    {
        return View();
    }
}

Here in the above first action result will have the delete confirmation view and another will perform actual delete operation with session delete method.

Deleteviewwithaspnetmvcandnhibernate

When you run into the browser it will look like following.

DeleteScreenwithaspnetmvcandnhibernate

That’s it. It’s very easy to have crud operation with NHibernate. Stay tuned for more.
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Sunday, September 8, 2013

DotNetJalps- My 600th blog post!!

I don’t know how I have reached there but woohoo!! I am writing my 600th blog post. I feel very proud writing this blog post. This is a great journey and I have learned lots of things during this great journey.

First of all I like to thank my family members my family members for continuous support they are providing me to maintain this blog and supporting that everything I do. On this occasion I would like to thank all the readers and visitors of this blog without your love and support I could not have been achieved what I am. You are the inspiration for me to writing blogs.

600blogpost

I would also like to thanks all my friends, colleagues and employers without there it was not possible to achieve this.

Again I would also like thank all the people who have ever read post , retweeted a  tweet,liked a facebook status, left a comment, repinned a pin, share a link of my blog and recommended a link  and a friend.

If you want to get this blog update on your email. Please subscribe to my blog feeds. My feeds link is

http://feeds.feedburner.com/DotNetJalps.

Thank you again for reading this..Stay tuned for more.
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Code Lens in Visual Studio 2013

This post will be a part of Visual Studio 2013 features series.

Microsoft has recently launched a Preview version of Visual Studio 2013 and I am using that more then a month now and discovering new features every day. In this blog post we will learn about code lens in Visual Studio 2013.

When you launch a code view you view in Visual Studio 2013. You will notice the references information show on the top of each of methods.

VisualStudio2013References


Once you mouse over this you will get a lens popup where you can find this information of references of a method.

VisualStudio2013CodeLens

Once you click on any method it will show a glimpse of code where it used.

DiggingOfMethodInVisualStudio2013

Once you double click this it will go to the page where code is written.

CodeWrittenVisualStudio2013

It is indeed a useful feature when you do code review or dig into code. Hope you like it. Stay tuned for more…
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Saturday, September 7, 2013

Project Management National Conference 2013

banners for blogs 3

Project Management Institute of India (www.pmi.org.in) organizing a event for project managers on 27th and 28th September at Gurgaon. It will be a great event for all the aspiring project managers. Last year more then thousand of delegates attended this annual event to reap benefits. This year also I would also like to encourage you to participate and gain knowledge.



Image 01

You should attend this event because..
  • You will get a chance to meet lots of people around country with same position It’s a great way to extend your network.
  • 11 visionary speakers sharing their knowledge including Dr. Shashi Tharoor, Mr. Arjun Maira, Mr. Nandan Nilekani , Swami Sukhabodhananda and others on the same podium.
  • 2 Projects will presented as case studies.
  • 14 paper presentations by experts.
Following is a link from where you can have your registration and get more information
http://pmi.org.in/pmconf2013/?utm_source=blogger&utm_medium=blogs&utm_campaign=p005#


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