Nhibernate

axx45 2007-08-15 02:05:25
我在根据 Nhibernet的 quickstart的时候 系统提示一个异常
“QuickStart.NHibernateHelper”的类型初始值设定项引发异常。


protected void btnInsert_Click(object sender, EventArgs e)
{
ISession session = NHibernateHelper.GetCurrentSession();
ITransaction tx=session.BeginTransaction();
Cat princess = new Cat();
princess.Name = "Princess";
princess.Sex = 'F';
princess.Weight = 7.4f;
session.Save(princess);
tx.Commit();
NHibernateHelper.CloseSession();
}


ISession session = NHibernateHelper.GetCurrentSession();
就是这一行出现的问题



请高人指教
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axx45 2007-08-15
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运行时没有错误 我在网页上有个按钮 点击按钮时 就出现了这个异常
axx45 2007-08-15
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配置文件我也都写好了 应该没有问题的
axx45 2007-08-15
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怎么看出来是nbh的配置有问题呢


我才开始学 对nhb不了解啊 555
Jinglecat 2007-08-15
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晕,那是你的 NHB 配置有误 ......
axx45 2007-08-15
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对啊 最跟本的原因是这个 但是我知道应该怎么解决 确信没有写错55
Jinglecat 2007-08-15
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不信,你就在这句上打个断点,然后 debug
Jinglecat 2007-08-15
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运行时错误 ....
axx45 2007-08-15
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怎么没有人 回复呢 急死我了
照葫芦花瓢还会出问题
axx45 2007-08-15
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没有错误
Jinglecat 2007-08-15
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检查 以下

sessionFactory = new Configuration().Configure().BuildSessionFactory();

是否有错
axx45 2007-08-15
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补充:public sealed class NHibernateHelper
{
private const string CurrentSessionKey = "nhibernate.current_session";
private static readonly ISessionFactory sessionFactory;

static NHibernateHelper()
{
sessionFactory = new Configuration().Configure().BuildSessionFactory();
}

public static ISession GetCurrentSession()
{
HttpContext context = HttpContext.Current;
ISession currentSession = context.Items[CurrentSessionKey] as ISession;

if (currentSession == null)
{
currentSession = sessionFactory.OpenSession();
context.Items[CurrentSessionKey] = currentSession;
}

return currentSession;
}
NHibernate 之旅(1):开篇有益.............................................................................................5 NHibernate 开篇有益 ................................................................................................5 NHibernate 是什么 ....................................................................................................5 NHibernate 的架构 ....................................................................................................6 NHibernate 资源 ........................................................................................................7 欢迎加入 NHibernate 中文社区 ...............................................................................7 NHibernate 之旅(2):第一个 NHibernate 程序..............................................................8 开始使用 NHibernate ................................................................................................8 1.获取 NHibernate ....................................................................................................9 2.建立数据库表 ..............................................................................................................9 3.创建 C#类库项目 .....................................................................................................10 4.编写 DomainModel 层 ........................................................................................11 5.编写数据访问层 ........................................................................................................13 6.编写数据访问层的测试 ............................................................................................15 结语.................................................................................................................................17 NHibernate 之旅(3):探索查询之 NHibernate 查询语言(HQL)..............................17 NHibernate 中的查询方法 ......................................................................................18 NHibernate 查询语言(HQL).................................................................................18 实例分析.........................................................................................................................22 结语.................................................................................................................................23 NHibernate 之旅(4):探索查询之条件查询(Criteria Query) ...................................24 NHibernate 中的查询方法 ......................................................................................24 条件查询(Criteria Query).....................................................................................24 根据示例查询(Query By Example) ...................................................................26 实例分析.........................................................................................................................27 结语.................................................................................................................................28 NHibernate 之旅(5):探索 Insert, Update, Delete 操作 .......................................28 操作数据概述.................................................................................................................28 1.新建对象 ....................................................................................................................29 2.删除对象 ....................................................................................................................29 3.更新对象 ....................................................................................................................30 4.保存更新对象 ............................................................................................................31 结语.................................................................................................................................32 NHibernate 之旅(6):探索 NHibernate 中的事务........................................................32 事务概述.........................................................................................................................33 1.新建对象 ....................................................................................................................34 2.删除对象 ....................................................................................................................37 3.更新对象 ....................................................................................................................37 4.保存更新对象 ............................................................................................................38 结语.................................................................................................................................39 NHibernate 之旅(7):初探 NHibernate 中的并发控制................................................39 什么是并发控制?.........................................................................................................39 悲观并发控制(Pessimistic Concurrency) ......................................................40 乐观并发控制(Optimistic Concurrency) ........................................................40 NHibernate 支持乐观并发控制 ..............................................................................40 实例分析.........................................................................................................................41 结语.................................................................................................................................44 NHibernate 之旅(8):巧用组件之依赖对象.......................................................................44 引入.................................................................................................................................45 方案 1:直接添加.........................................................................................................45 方案 2:巧用组件.........................................................................................................45 实例分析.........................................................................................................................46 结语.................................................................................................................................50 NHibernate 之旅(9):探索父子关系(一对多关系)...........................................................50 引入.................................................................................................................................50 NHibernate 中的集合类型 ......................................................................................51 建立父子关系.................................................................................................................51 父子关联映射.................................................................................................................53 结语.................................................................................................................................57 NHibernate 之旅(10):探索父子(一对多)关联查询........................................................57 关联查询引入.................................................................................................................58 一对多关联查询.............................................................................................................58 结语.................................................................................................................................62 NHibernate 之旅(11):探索多对多关系及其关联查询 ....................................................62 多对多关系引入.............................................................................................................63 多对多映射关系.............................................................................................................64 多对多关联查询.............................................................................................................66 结语.................................................................................................................................69 NHibernate 之旅(12):初探延迟加载机制 ........................................................................70 引入.................................................................................................................................70 延迟加载(Lazy Loading) .......................................................................................71 实例分析.........................................................................................................................72 1.一对多关系实例 ........................................................................................................72 2.多对多关系实例 ........................................................................................................74 结语.................................................................................................................................78 NHibernate 之旅(13):初探立即加载机制 ........................................................................78 引入.................................................................................................................................78 立即加载.........................................................................................................................79 实例分析.........................................................................................................................79 1.一对多关系实例 ........................................................................................................79 2.多对多关系实例 ........................................................................................................82 结语.................................................................................................................................86 NHibernate 之旅(14):探索 NHibernate 中使用视图.................................................86 引入.................................................................................................................................87 1.持久化类 ....................................................................................................................87 2.映射文件 ....................................................................................................................88 3.测试 ............................................................................................................................89 结语.................................................................................................................................90 NHibernate 之旅(15):探索 NHibernate 中使用存储过程(上) ................................90 引入.................................................................................................................................90 使用 MyGeneration 生成存储过程........................................................................90 实例分析.........................................................................................................................94 结语.................................................................................................................................97 NHibernate 之旅(16):探索 NHibernate 中使用存储过程(中) ................................97 引入.................................................................................................................................97 实例分析.........................................................................................................................97 结语...............................................................................................................................102 NHibernate 之旅(17):探索 NHibernate 中使用存储过程(下) ..............................102 引入...............................................................................................................................103 实例分析.......................................................................................................................103 拾遗...............................................................................................................................107 结语...............................................................................................................................108 NHibernate 之旅(18):初探代码生成工具使用 ..............................................................108 引入...............................................................................................................................108 代码生成工具...............................................................................................................109 结语...............................................................................................................................117 NHibernate 之旅(19):初探 SchemaExport 工具使用............................................117 引入...............................................................................................................................118 SchemaExport 工具 .............................................................................................118 SchemaUpdate 工具 ............................................................................................119 实例分析.......................................................................................................................119 结语...............................................................................................................................124 NHibernate 之旅(20):再探 SchemaExport 工具使用............................................124 引入...............................................................................................................................125 实例分析.......................................................................................................................125 1.表及其约束 ..............................................................................................................125 2.存储过程、视图 ......................................................................................................130 结语...............................................................................................................................132 NHibernate 之旅(21):探索对象状态 ..............................................................................132 引入...............................................................................................................................132 对象状态.......................................................................................................................133 对象状态转换...............................................................................................................133 结语...............................................................................................................................137 NHibernate 之旅(22):探索 NHibernate 一级缓存...................................................137 引入...............................................................................................................................137 NHibernate 一级缓存介绍 ....................................................................................137 NHibernate 一级缓存管理 ....................................................................................141 结语...............................................................................................................................142 NHibernate 之旅(23):探索 NHibernate 二级缓存(上) ..........................................142 引入...............................................................................................................................143 介绍 NHibernate 二级缓存 ...................................................................................143 NHibernate 二级缓存提供程序 ............................................................................143 实现 NHibernate 二级缓存 ...................................................................................144 结语...............................................................................................................................149 NHibernate 之旅(24):探索 NHibernate 二级缓存(下) ..........................................149 引入...............................................................................................................................149 使用 NHibernate 二级缓存 ...................................................................................150 启用缓存查询...............................................................................................................151 管理 NHibernate 二级缓存 ...................................................................................154 结语...............................................................................................................................158

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