NHibernate开源框架Cuyahoga学习之数据访问实现

代码

using  System;
using  System.Collections;
using  System.Collections.Generic;
using  Castle.Facilities.NHibernateIntegration;
using  Castle.Services.Transaction;
using  Cuyahoga.Core.Util;
using  NHibernate;
using  NHibernate.Criterion;

using  Cuyahoga.Core.Domain;

namespace  Cuyahoga.Core.DataAccess
{
     ///   <summary>
     ///  Provides data access for user-related components.
     ///   </summary>
    [Transactional]
     public   class  UserDao : IUserDao
    {
         private  ISessionManager _sessionManager;
         private  ICommonDao _commonDao;

         ///   <summary>
         ///  Default constructor;
         ///   </summary>
         ///   <param name="sessionManager"></param>
         public  UserDao(ISessionManager sessionManager, ICommonDao commonDao)
        {
             this ._sessionManager  =  sessionManager;
             this ._commonDao  =  commonDao;
        }

         #region  IUserDao Members

         public  User GetUserByUsernameAndPassword( string  username,  string  password)
        {
            ISession session  =   this ._sessionManager.OpenSession();

            ICriteria crit  =  session.CreateCriteria( typeof (User));
            crit.Add(Expression.Eq( " UserName " , username));
            crit.Add(Expression.Eq( " Password " , password));
            IList results  =  crit.List();
             if  (results.Count  ==   1 )
            {
                 return  (User)results[ 0 ];
            }
             else   if  (results.Count  >   1 )
            {
                 throw   new  Exception(String.Format( " Multiple users found with the give username and password. Something is pretty wrong here " ));
            }
             else
            {
                 return   null ;
            }
        }

         public  IList FindUsersByUsername( string  searchString)
        {
             if  (searchString.Length  >   0 )
            {
                ISession session  =   this ._sessionManager.OpenSession();
                 string  hql  =   " from User u where u.UserName like ? order by u.UserName  " ;
                 return  session.Find(hql, searchString  +   " % " , NHibernateUtil.String);
            }
             else
            {
                 return   this ._commonDao.GetAll( typeof (User),  " UserName " );
            }
        }
         // 根据条件分页
         public  IList < User >  FindUsers( string  username,  int ?  roleId,  bool ?  isActive,  int ?  siteId,  int  pageSize,  int  pageNumber,  out   int  totalCount)
        {
            ISession session  =   this ._sessionManager.OpenSession();
            ICriteria userCriteria  =  session.CreateCriteria( typeof (User));
            ICriteria countCriteria  =  session.CreateCriteria( typeof (User),  " userCount " );

             if  ( ! String.IsNullOrEmpty(username))
            {
                 // username相似：从开始匹配
                userCriteria.Add(Expression.InsensitiveLike( " UserName " , username, MatchMode.Start));
                countCriteria.Add(Expression.InsensitiveLike( " UserName " , username, MatchMode.Start));
            }
             if  (roleId.HasValue)
            {
                userCriteria.CreateCriteria( " Roles " ,  " r1 " ).Add(Expression.Eq( " r1.Id " , roleId));
                countCriteria.CreateCriteria( " Roles " ,  " r1 " ).Add(Expression.Eq( " r1.Id " , roleId));
            }
             if  (isActive.HasValue)
            {
                userCriteria.Add(Expression.Eq( " IsActive " , isActive));
                countCriteria.Add(Expression.Eq( " IsActive " , isActive));
            }
             if  (siteId.HasValue  &&   !  roleId.HasValue)
            {
                
                DetachedCriteria roleIdsForSite  =  DetachedCriteria.For( typeof  (Role))
                    .SetProjection(Projections.Property( " Id " ))
                    .CreateCriteria( " Sites " ,  " site " ) // Sites 别名site
                    .Add(Expression.Eq( " site.Id " , siteId.Value));
                DetachedCriteria userIdsForRoles  =  DetachedCriteria.For( typeof (User))
                    .SetProjection(Projections.Distinct(Projections.Property( " Id " )))
                    .CreateCriteria( " Roles " )
                    .Add(Subqueries.PropertyIn( " Id " , roleIdsForSite));
                userCriteria.Add(Subqueries.PropertyIn( " Id " , userIdsForRoles));
                countCriteria.Add(Subqueries.PropertyIn( " Id " , userIdsForRoles));
                 // 里面的属性方法有待进一步查阅资料
            }
            userCriteria.SetFirstResult((pageNumber  -   1 )  *  pageSize);
            userCriteria.SetMaxResults(pageSize);
            countCriteria.SetProjection(Projections.RowCount());
            totalCount  =  ( int ) countCriteria.UniqueResult();
             return  userCriteria.List < User > ();
        }

         public  IList < Section >  GetViewableSectionsByUser(User user)
        {

             // :userId参数User和Role进行了关联映射所以可以用u.Rolse来获取Role的相关数据
             string  hql  =   " select s from User u join u.Roles as r, Section s join s.SectionPermissions sp  "   +
                         " where u.Id = :userId and r.Id = sp.Role.Id and sp.ViewAllowed = 1 " ;
            IQuery q  =   this ._sessionManager.OpenSession().CreateQuery(hql);
            q.SetInt32( " userId " , user.Id);
             return  q.List < Section > ();
        }

              public  IList < Section >  GetViewableSectionsByAccessLevel(AccessLevel accessLevel)
        {
             int  permission  =  ( int )accessLevel;

             string  hql  =   " select s from Section s join s.SectionPermissions sp, Role r  " +
                 " where r.PermissionLevel = :permission and r.Id = sp.Role.Id and sp.ViewAllowed = 1 " ;
            IQuery q  =   this ._sessionManager.OpenSession().CreateQuery(hql);
            q.SetInt32( " permission " , permission);
             return  q.List < Section > ();
        }
         public  IList < Role >  GetRolesByRightName( string  rightName)
        {
             string  hql  =   " select r from Role r join r.Rights right where right.Name = :rightName " ;
            IQuery q  =   this ._sessionManager.OpenSession().CreateQuery(hql);
            q.SetString( " rightName " , rightName);
             return  q.List < Role > ();
        }

         public  IList < Role >  GetAllRolesBySite(Site site)
        {
            ISession session  =   this ._sessionManager.OpenSession();
            ICriteria crit  =  session.CreateCriteria( typeof  (Role))
                .AddOrder(Order.Asc( " Name " ))
                .CreateCriteria( " Sites " )
                .Add(Expression.Eq( " Id " , site.Id));
             return  crit.List < Role > ();
        }

        [Transaction(TransactionMode.Requires)]
         public   void  SaveOrUpdateUser(User user)
        {
            ISession session  =   this ._sessionManager.OpenSession();
            session.SaveOrUpdate(user);
        }

        [Transaction(TransactionMode.Requires)]
         public   void  DeleteUser(User user)
        {
            ISession session  =   this ._sessionManager.OpenSession();
            session.Delete(user);
        }

         #endregion
    }
}