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NHibernate Templates for Smart Code Generator

, 11 Dec 2007 CPOL
Describes how to generate NHibernate objects and ASPX pages using Smart Code
nhibernate.zip
NHibernate
Everything-1.0.suo
Newin.scp
NHibernate
bin
Debug
NHibernateTemplates.dll
NHibernateTemplates.pdb
SmartCode.Model.DLL
SmartCode.Template.dll
mssccprj.scc
NHibernate.csproj.vspscc
NHibernateTemplates.csproj.user
Properties
vssver2.scc
vssver2.scc
Northwind
Northwind.Core
bin
Debug
Northwind.Core.dll
NorthwindDomain.dll
ProjectBase.Utils.dll
DataInterfaces
vssver2.scc
Domain
vssver2.scc
Hbm
vssver2.scc
mssccprj.scc
nhibernate-mapping.xsx
Northwind.Core.csproj.vspscc
Properties
vssver2.scc
vssver2.scc
Northwind.Data
bin
Debug
Northwind.Core.dll
Northwind.Data.dll
ProjectBase.Data.dll
ProjectBase.Utils.dll
Manager
vssver2.scc
mssccprj.scc
Northwind.Data.csproj.vspscc
Properties
vssver2.scc
vssver2.scc
Northwind.Web
bin
Castle.DynamicProxy.dll
Iesi.Collections.dll
Northwind.Core.dll
Northwind.Data.dll
Northwind.Web.dll
ProjectBase.Utils.dll
mssccprj.scc
Northwind.Web.csproj.user
Northwind.Web.csproj.vspscc
Properties
vssver2.scc
Utils
vssver2.scc
vssver2.scc
ProjectBase.Utils
bin
Debug
log4net.dll
ProjectBase.Utils.dll
ProjectBase.Utils.pdb
mssccprj.scc
ProjectBase.Utils.csproj.vspscc
Properties
vssver2.scc
vssver2.scc
Web
vssver2.scc
WebTemplates
bin
Debug
SmartCode.Model.DLL
SmartCode.Template.dll
WebTemplates.dll
WebTemplates.pdb
Edit
vssver2.scc
List
vssver2.scc
mssccprj.scc
obj
Debug
Refactor
ResolveAssemblyReference.cache
TempPE
WebTemplates.dll
WebTemplates.pdb
Properties
vssver2.scc
vssver2.scc
WebTemplates.csproj.user
WebTemplates.csproj.vspscc
using System;
using System.Collections.Generic;
using NHibernate;
using NHibernate.Expression;
using Northwind.Data;

namespace Northwind.Data
{
    public abstract class AbstractNHibernateDao<T, IdT> : IDao<T, IdT>
    {
        private Type persitentType = typeof(T);

        /// <summary>
        /// Loads an instance of type TypeOfListItem from the DB based on its ID.
        /// </summary>
        public virtual T GetById(IdT id, bool shouldLock)
        {
            T entity;

            if (shouldLock)
            {
                entity = (T)NHibernateSession.Load(persitentType, id, LockMode.Upgrade);
            }
            else
            {
                entity = (T)NHibernateSession.Load(persitentType, id);
            }

            return entity;
        }

        /// <summary>
        /// Loads every instance of the requested type with no filtering.
        /// </summary>
        public List<T> GetAll()
        {
            return GetByCriteria();
        }

        /// <summary>
        /// Loads every instance of the requested type using the supplied <see cref="ICriterion" />.
        /// If no <see cref="ICriterion" /> is supplied, this behaves like <see cref="GetAll" />.
        /// </summary>
        public List<T> GetByCriteria(params ICriterion[] criterion)
        {
            ICriteria criteria = NHibernateSession.CreateCriteria(persitentType);

            foreach (ICriterion criterium in criterion)
            {
                criteria.Add(criterium);
            }

            return criteria.List<T>() as List<T>;
        }

        public List<T> GetByExample(T exampleInstance, params string[] propertiesToExclude)
        {
            ICriteria criteria = NHibernateSession.CreateCriteria(persitentType);
            Example example = Example.Create(exampleInstance);

            foreach (string propertyToExclude in propertiesToExclude)
            {
                example.ExcludeProperty(propertyToExclude);
            }

            criteria.Add(example);

            return criteria.List<T>() as List<T>;
        }

        /// <summary>
        /// Looks for a single instance using the example provided.
        /// </summary>
        /// <exception cref="NonUniqueResultException" />
        public T GetUniqueByExample(T exampleInstance, params string[] propertiesToExclude)
        {
            List<T> foundList = GetByExample(exampleInstance, propertiesToExclude);

            if (foundList.Count > 1)
            {
                throw new NonUniqueResultException(foundList.Count);
            }

            if (foundList.Count > 0)
            {
                return foundList[0];
            }
            else
            {
                return default(T);
            }
        }

        /// <summary>
        /// For entities that have assigned ID's, you must explicitly call Save to add a new one.
        /// See http://www.hibernate.org/hib_docs/reference/en/html/mapping.html#mapping-declaration-id-assigned.
        /// </summary>
        public T Save(T entity)
        {
            NHibernateSession.Save(entity);
            return entity;
        }

        /// <summary>
        /// For entities with automatatically generated IDs, such as identity, SaveOrUpdate may 
        /// be called when saving a new entity.  SaveOrUpdate can also be called to update any 
        /// entity, even if its ID is assigned.
        /// </summary>
        public T SaveOrUpdate(T entity)
        {
            NHibernateSession.SaveOrUpdate(entity);
            return entity;
        }

        public void Delete(T entity)
        {
            NHibernateSession.Delete(entity);
        }

        /// <summary>
        /// Commits changes regardless of whether there's an open transaction or not
        /// </summary>
        public void CommitChanges()
        {
            if (NHibernateSessionManager.Instance.HasOpenTransaction())
            {
                NHibernateSessionManager.Instance.CommitTransaction();
            }
            else
            {
                // If there's no transaction, just flush the changes
                NHibernateSessionManager.Instance.GetSession().Flush();
            }
        }

        /// <summary>
        /// Exposes the ISession used within the DAO.
        /// </summary>
        private ISession NHibernateSession
        {
            get
            {
                return NHibernateSessionManager.Instance.GetSession();
            }
        }


    }
}

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Danilo Mendez
Web Developer
United States United States
Danilo is the creator of SmartRules, a Business Rules Engine. He is an industry consultant working primarily with companies interested in implementing dynamic rules programming concepts to add flexibility to their architectures on web, CE, and desktop platforms. He operates his own website, Kontac, where you will find more information.
 
To contact Danilo, email him at danilo.mendez@gmail.com.

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