NPersistence - .NET Persistence API

Step 6 - Create a utility class

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In this step, we create a utility class to help us obtain the required object for using NPersistence.

  • Right click on the ‘code’ folder node, click ‘Add New Item…’
  • In the opened dialog, choose 'Class', name it PersistenceUtils.cs and click Add.

  • Go to the newly created PersistenceUtils class and paste the following code into it:
using NPersistence;
public class PersistenceUtils
{
    private static EntityManager em;
    private static EntityManagerFactory emf;
    public static EntityManager getEm()
    {
        if (em == null)
        {
            emf = Persistence.CreateEntityManagerFactory("testPersistenceUnit");
            em = emf.CreateEntityManager();
        }
        if (!em.IsOpen())
        {
            em = emf.CreateEntityManager();
        }
        return em;
    }
    internal static EntityManagerFactory getEmf()
    {
        return emf;
    }
}

Next: Step 7 - Configure NPersistence