NHibernate代码映射

上一篇NHibernate学习笔记—使用 NHibernate构建一个get='_blank'>ASP.NET MVC应用程序

使用的是

新建一个抽象的数据化持久基类AbstractNHibernateDao.cs

  /// <summary>  /// 数据持久化基本  /// </summary>  /// <typeparam name="T">要持久化的数据类型</typeparam>  /// <typeparam name="TID">ID字段的数据类型</typeparam>  public abstract class AbstractNHibernateDao<T, TId> : IDao<T, TId>  {    private const string APPSETTING_NAME = "sessionPath";            /// <param name="sessionFactoryConfigPath">指定Session工厂的配置文件</param>    protected AbstractNHibernateDao(string sessionFactoryConfigPath) {      if (string.IsNullOrEmpty(sessionFactoryConfigPath))      {        sessionFactoryConfigPath = "NHibernate.config";      }      //如果路径中包含 :(盘符) 符号，则证明传入的是一个绝对路径，可直接使用。      //否则就是相对路径，在WEB环境中，用Server.MapPath转换成绝对路径，在App环境中，则加上当前运行目录      if (sessionFactoryConfigPath.Contains(":"))        SessionFactoryConfigPath = sessionFactoryConfigPath;      else if (System.Web.HttpContext.Current != null)        SessionFactoryConfigPath = System.Web.HttpContext.Current.Server.MapPath("~/"+sessionFactoryConfigPath);      else        SessionFactoryConfigPath = System.IO.Path.Combine(AppDomain.CurrentDomain.BaseDirectory, sessionFactoryConfigPath);    }    /// <summary>    /// 初始化AbstractNHibernateDao类，默认使用config文件Appsetting中 sessionPath所指定的文件进行初始化    /// </summary>    protected AbstractNHibernateDao()      : this(ConfigurationManager.AppSettings[APPSETTING_NAME])    {    }    /// <summary>    /// 根据ID从数据库获取一个类型为T的实例    /// </summary>    public T GetById(TId id, bool shouldLock)    {      T entity;      if (shouldLock)      {        entity = NHibernateSession.Get<T>(id, LockMode.Upgrade);      }      else      {        entity = NHibernateSession.Get<T>(id);      }      return entity;    }    /// <summary>    /// 根据ID从数据库获取一个类型为T的实例    /// </summary>    public T GetById(TId id)    {      return GetById(id, false);    }    /// <summary>    /// 获取所有的类型为T的对象    /// </summary>    public IList<T> GetAll() {      return GetByCriteria();    }    /// <summary>    /// 根据给定的 <see cref="ICriterion" /> 来查询结果    /// 如果没有传入 <see cref="ICriterion" />, 效果与 <see cref="GetAll" />一致.    /// </summary>    public IList<T> GetByCriteria(params ICriterion[] criterion) {      ICriteria criteria = NHibernateSession.CreateCriteria(persitentType);      foreach (ICriterion criterium in criterion) {        criteria.Add(criterium);      }            criteria.AddOrder(new Order("ID", false));      return criteria.List<T>();    }    /// <summary>    /// 根据exampleInstance的属性值来查找对象，返回与其值一样的对象对表。    /// exampleInstance中值为0或NULL的属性将不做为查找条件    /// </summary>    /// <param name="exampleInstance">参考对象</param>    /// <param name="propertiesToExclude">要排除的查询条件属性名</param>    /// <returns></returns>    public IList<T> GetByExample(T exampleInstance, params string[] propertiesToExclude)    {      ICriteria criteria = NHibernateSession.CreateCriteria(exampleInstance.GetType());      Example example = Example.Create(exampleInstance);      foreach (string propertyToExclude in propertiesToExclude) {        example.ExcludeProperty(propertyToExclude);      }      example.ExcludeNone();      example.ExcludeNulls();      example.ExcludeZeroes();      criteria.Add(example);      criteria.AddOrder(new Order("ID", false));      return criteria.List<T>();    }    public IPageOfList<T> GetByExample(T exampleInstance, int pageIndex, int pageSize, params string[] propertiesToExclude)    {      ICriteria criteria = NHibernateSession.CreateCriteria(persitentType);      Example example = Example.Create(exampleInstance);      foreach (string propertyToExclude in propertiesToExclude) {        example.ExcludeProperty(propertyToExclude);      }      example.ExcludeNone();      example.ExcludeNulls();      example.ExcludeZeroes();            int recordTotal = Convert.ToInt32((criteria.Clone() as ICriteria).SetProjection(Projections.Count("ID")).UniqueResult());      criteria.AddOrder(new Order("ID", false));      criteria.Add(example).SetFirstResult(pageIndex*pageSize).SetMaxResults(pageSize);      return new PageOfList<T>(criteria.List<T>(), pageIndex, pageSize, recordTotal);    }    /// <summary>    /// 使用<see cref="GetByExample"/>来返回一个唯一的结果，如果结果不唯一会抛出异常    /// </summary>    /// <exception cref="NonUniqueResultException" />    public T GetUniqueByExample(T exampleInstance, params string[] propertiesToExclude) {      IList<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>    /// 将指定的对象保存到数据库，并立限提交，并返回更新后的ID    /// 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);      NHibernateSession.Flush();      return entity;    }    /// <summary>    /// 将指定的对象保存或更新到数据库，并返回更新后的ID    /// </summary>    public T SaveOrUpdate(T entity)    {      NHibernateSession.SaveOrUpdate(entity);      NHibernateSession.Flush();      return entity;    }    /// <summary>    /// 从数据库中删除指定的对象    /// </summary>    public void Delete(T entity)    {      NHibernateSession.Delete(entity);      NHibernateSession.Flush();    }    public DbTransaction BeginTransaction()    {      ITransaction tran = NHibernateSession.BeginTransaction();// NHibernateSessionManager.Instance.BeginTransactionOn(SessionFactoryConfigPath);      return new DbTransaction(tran);    }    /// <summary>    /// 提交所有的事务对象，并Flush到数据库    /// </summary>    public void CommitChanges() {      if (NHibernateSessionManager.Instance.HasOpenTransactionOn(SessionFactoryConfigPath)) {        NHibernateSessionManager.Instance.CommitTransactionOn(SessionFactoryConfigPath);      }      else {        // 如果不是事务模式，就直接调用Flush来更新                NHibernateSession.Flush();      }    }    /// <summary>    /// 返回对应的Session.    /// </summary>    protected ISession NHibernateSession {      get {        return NHibernateSessionManager.Instance.GetSessionFrom(SessionFactoryConfigPath);      }    }    /// <summary>    /// 数据类型    /// </summary>    private Type persitentType = typeof(T);        /// <summary>    /// Session配置文件路径    /// </summary>    protected readonly string SessionFactoryConfigPath;    public virtual IPageOfList<T> GetByFilter(ParameterFilter filter)    {      string sql = " from " + typeof(T).Name + " a where 1=1 ";      if (filter.HasQueryString)        sql = filter.ToHql();      else        sql += filter.ToHql();      var paras = filter.GetParameters();      var countQuery = NHibernateSession.CreateQuery("select count(*) " + sql);      var query = NHibernateSession.CreateQuery("select a " + sql + filter.GetOrderString());      foreach (var key in paras.Keys)      {        countQuery.SetParameter(key, paras[key]);        query.SetParameter(key, paras[key]);      }      int pageIndex = filter.PageIndex;      int pageSize = filter.PageSize;      long recodTotal = Convert.ToInt64(countQuery.UniqueResult());      var list = query.SetFirstResult(pageIndex * pageSize).SetMaxResults(pageSize).List<T>();      return new PageOfList<T>(list, pageIndex, pageSize, recodTotal);    }  }

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原标题：NHibernate代码映射

关键词：Hibernate