01-04-01【Nhibernate (版本3.3.1.4000) 出入江湖】原生的SQL查询

Nhibernate 支持原生的SQL查询 ：

         /// <summary>
         /// 使用原生的SQL查询
         /// </summary>
         /// <param name="datetime"></param>
         /// <returns></returns>
         public IList<Customer> GetCustomersByDateTimeUsingSql(string datetime)
         {
             IList<Customer> resuCustomers = null;

             ISession session = _sessionManager.GetSession();
             ITransaction transaction = session.BeginTransaction();

             ;
             try
             {
                 //方式一：直接拼装SQL语句
                 //String sql = String.Format("select distinct CustomerAlias.* " +
                 //                           " from Customer CustomerAlias inner join [Order] " +
                 //                           " on CustomerAlias.CustomerId = [Order].CustomerId" +
                 //                           " where [Order].OrderDate >='{0}';", datetime);
                 ////用原生的SQL语句查询时，用AddEntity拼装实体类
                 //resuCustomers = session.CreateSQLQuery(sql).AddEntity("CustomerAlias", typeof(Customer)).List<Customer>();

                 //方式二：使用查询参数
                 String sqlusingParameter = String.Format("select distinct CustomerAlias.* " +
                                                          " from Customer CustomerAlias inner join [Order] " +
                                                          " on CustomerAlias.CustomerId = [Order].CustomerId" +
                                                          " where [Order].OrderDate >=:paraDatetime And CustomerAlias.Age=:paraAge;");
                 //用原生的SQL语句查询时，用AddEntity拼装实体类
                 resuCustomers = session.CreateSQLQuery(sqlusingParameter).AddEntity("CustomerAlias", typeof(Customer))
                     .SetString("paraDatetime", datetime)
                     .SetInt32("paraAge", )
                     .List<Customer>();

                 transaction.Commit();
             }
             catch (Exception)
             {
                 transaction.Rollback();
                 throw;
             }
             finally
             {
                 //如果已经打开了支持延迟，当外部用到延迟加载属性，
                 //session早已关闭，所以会抛出异常。
                 session.Close();
             }

             return resuCustomers;
         }