當(dāng)前位置：首頁 > 运维知识 > 数据库 >内容正文

数据库

NHibernate利用Mindscape.NHibernateModelDesigner实现数据库与实体之间的转换及操作

發(fā)布時(shí)間：2025/3/8 数据库 32 豆豆

生活随笔收集整理的這篇文章主要介紹了 NHibernate利用Mindscape.NHibernateModelDesigner实现数据库与实体之间的转换及操作小編覺得挺不錯(cuò)的,現(xiàn)在分享給大家,幫大家做個(gè)參考.

環(huán)境：
&nbsp&nbspVisual Studio 2010

一、Mindscape.NhibernateModelDesigner安裝

&nbsp&nbsp在打開VS2010之后，我們能夠在“工具”菜單下找到“擴(kuò)展管理器，搜索：Mindscape NHibernate Model Designer 下載安裝就可以。安裝完畢后，在向項(xiàng)目中加入新項(xiàng)時(shí)假設(shè)我們拉到最下方我們會(huì)看到例如以下界面：

更加詳細(xì)的操作能夠參考：用好VS2010擴(kuò)展管理器-NHibernate生成

二、依據(jù)數(shù)據(jù)庫表結(jié)構(gòu)生成實(shí)體并通過實(shí)體進(jìn)行操作

1、加入nhmodel實(shí)體

2、打開nhmodel實(shí)體，依據(jù)數(shù)據(jù)庫表生成實(shí)體

&nbsp&nbsp左側(cè)工具欄部分切換到【server資源管理器】，連接上你想要獲取數(shù)據(jù)結(jié)構(gòu)的數(shù)據(jù)庫。就會(huì)看到展示出來的數(shù)據(jù)庫內(nèi)容：

&nbsp&nbsp拖動(dòng)你想要的表到設(shè)計(jì)器主界面。例如以下圖：

就可以獲取到數(shù)據(jù)庫表相應(yīng)的實(shí)體。

3、生成配置文件

小注：
&nbsp&nbsp假設(shè)不生成配置文件直接執(zhí)行第4步中代碼，會(huì)報(bào)出以下的錯(cuò)誤：

未處理 NHibernate.Cfg.HibernateConfigExceptionHResult=-2146232832Message=An exception occurred during configuration of persistence layer.Source=NHibernateStackTrace:在 NHibernate.Cfg.ConfigurationSchema.HibernateConfiguration..ctor(XmlReader hbConfigurationReader, Boolean fromAppSetting)在 NHibernate.Cfg.ConfigurationSchema.HibernateConfiguration..ctor(XmlReader hbConfigurationReader)在 NHibernate.Cfg.Configuration.Configure(XmlReader textReader)在 NHibernate.Cfg.Configuration.Configure(String fileName, Boolean ignoreSessionFactoryConfig)在 NHibernate.Cfg.Configuration.Configure(String fileName)在 NHibernate.Cfg.Configuration.Configure()在 DataBaseToEntity.ConfigurationHelper.CreateConfiguration() 位置 C:\Users\JianKunKing\Desktop\NHibernateStudy\NHibernateStudy\DataBaseToEntity\NHibernateModel1.cs:行號(hào) 20在 DataBaseToEntity.DataBaseToEntityForm1..ctor() 位置 C:\Users\JianKunKing\Desktop\NHibernateStudy\NHibernateStudy\DataBaseToEntity\DataBaseToEntityForm1.cs:行號(hào) 20在 DataBaseToEntity.Program.Main() 位置 C:\Users\JianKunKing\Desktop\NHibernateStudy\NHibernateStudy\DataBaseToEntity\Program.cs:行號(hào) 18在 System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)在 System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)在 Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()在 System.Threading.ThreadHelper.ThreadStart_Context(Object state)在 System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)在 System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)在 System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)在 System.Threading.ThreadHelper.ThreadStart()InnerException: System.IO.FileNotFoundExceptionHResult=-2147024894Message=未能找到文件“C:\Users\JianKunKing\Desktop\NHibernateStudy\NHibernateStudy\DataBaseToEntity\bin\Debug\hibernate.cfg.xml”。

Source=mscorlib FileName=C:\Users\JianKunKing\Desktop\NHibernateStudy\NHibernateStudy\DataBaseToEntity\bin\Debug\hibernate.cfg.xml StackTrace: 在 System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath) 在 System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost) 在 System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize) 在 System.Xml.XmlDownloadManager.GetStream(Uri uri, ICredentials credentials, IWebProxy proxy, RequestCachePolicy cachePolicy) 在 System.Xml.XmlUrlResolver.GetEntity(Uri absoluteUri, String role, Type ofObjectToReturn) 在 System.Xml.XmlTextReaderImpl.OpenUrlDelegate(Object xmlResolver) 在 System.Threading.CompressedStack.runTryCode(Object userData) 在 System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData) 在 System.Threading.CompressedStack.Run(CompressedStack compressedStack, ContextCallback callback, Object state) 在 System.Xml.XmlTextReaderImpl.OpenUrl() 在 System.Xml.XmlTextReaderImpl.Read() 在 System.Xml.XmlTextReader.Read() 在 System.Xml.XmlCharCheckingReader.Read() 在 System.Xml.XsdValidatingReader.Read() 在 System.Xml.XPath.XPathDocument.LoadFromReader(XmlReader reader, XmlSpace space) 在 System.Xml.XPath.XPathDocument..ctor(XmlReader reader, XmlSpace space) 在 System.Xml.XPath.XPathDocument..ctor(XmlReader reader) 在 NHibernate.Cfg.ConfigurationSchema.HibernateConfiguration..ctor(XmlReader hbConfigurationReader, Boolean fromAppSetting) InnerException:

4、通過實(shí)體來操作數(shù)據(jù)庫：

//獲取映射關(guān)系及配置 ISessionFactory sessionFactory = ConfigurationHelper.CreateConfiguration().Configure().BuildSessionFactory(); //此處新增 TbNHibernate entity = new TbNHibernate();entity.UserName = "UserName1";entity.UserPwd = "UserPwd1";using (ISession session = sessionFactory.OpenSession()){try{var a = session.Save(entity);session.Flush();}catch (Exception ee){MessageBox.Show(ee.ToString());}} //部分字段更新 using (ISession session = sessionFactory.OpenSession()){ITransaction trans = session.BeginTransaction();try{string sql = " update tb_NHibernate set userPWD=" + value + " where id='" + id + "'";ISQLQuery Query = session.CreateSQLQuery(sql).AddEntity(typeof(TbNHibernate));Query.ExecuteUpdate();session.Flush();trans.Commit();}catch (Exception ex){MessageBox.Show(ex.ToString());IsSuccess = false;trans.Rollback();}finally{if (session != null){session.Clear();}}}

三、依據(jù)實(shí)體生成數(shù)據(jù)庫表結(jié)構(gòu)并通過實(shí)體進(jìn)行操作

兩者之間的操作與之前一樣
小注：
&nbsp&nbsp

1、假設(shè)在選擇主鍵生成方式的時(shí)候選擇了HiLo選項(xiàng)

，那么生成表的主鍵字段是uniqueidentifier類型的：

CREATE TABLE [dbo].[DataBaseToEntity1]( [Id] [uniqueidentifier] NOT NULL, [Name] [nvarchar](max) NOT NULL, [Code] [nvarchar](max) NOT NULL, PRIMARY KEY CLUSTERED ( [Id] ASC )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] ) ON [PRIMARY] GO

&nbsp&nbsp假設(shè)在主鍵類型你選擇的是Guid

&nbsp&nbsp那么此時(shí)。你實(shí)體類中的主鍵字段是Guid類型的，假設(shè)你通過Guid.NewGuid()給你主鍵字段賦值會(huì)報(bào)出例如以下錯(cuò)誤：

------------------------------------------------------ NHibernate.HibernateException: error performing isolated work ---> System.FormatException: GUID 應(yīng)包括帶 4 個(gè)短劃線的 32 位數(shù)(xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx)。在 System.Guid.TryParseGuidWithNoStyle(String guidString, GuidResult& result)在 System.Guid.TryParseGuid(String g, GuidStyles flags, GuidResult& result)在 System.Guid..ctor(String g)在 NHibernate.Type.GuidType.Get(IDataReader rs, Int32 index)在 NHibernate.Id.TableGenerator.DoWorkInCurrentTransaction(ISessionImplementor session, IDbConnection conn, IDbTransaction transaction在 NHibernate.Engine.TransactionHelper.Work.DoWork(IDbConnection connection, IDbTransaction transaction)在 NHibernate.Transaction.AdoNetTransactionFactory.ExecuteWorkInIsolation(ISessionImplementor session, IIsolatedWork work, Boolean transacted)--- 內(nèi)部異常堆棧跟蹤的結(jié)尾 ---在 NHibernate.Transaction.AdoNetTransactionFactory.ExecuteWorkInIsolation(ISessionImplementor session, IIsolatedWork work, Boolean transacted)在 NHibernate.Transaction.AdoNetWithDistributedTransactionFactory.ExecuteWorkInIsolation(ISessionImplementor session, IIsolatedWork work, Boolean transacted)在 NHibernate.Engine.Transaction.Isolater.DoIsolatedWork(IIsolatedWork work, ISessionImplementor session)在 NHibernate.Engine.TransactionHelper.DoWorkInNewTransaction(ISessionImplementor session)在 NHibernate.Id.TableGenerator.Generate(ISessionImplementor session, Object obj)在 NHibernate.Id.TableHiLoGenerator.Generate(ISessionImplementor session, Object obj)在 NHibernate.Event.Default.AbstractSaveEventListener.SaveWithGeneratedId(Object entity, String entityName, Object anything, IEventSource source, Boolean requiresImmediateIdAccess)在 NHibernate.Event.Default.DefaultSaveOrUpdateEventListener.SaveWithGeneratedOrRequestedId(SaveOrUpdateEvent event)在 NHibernate.Event.Default.DefaultSaveEventListener.SaveWithGeneratedOrRequestedId(SaveOrUpdateEvent event)在 NHibernate.Event.Default.DefaultSaveOrUpdateEventListener.EntityIsTransient(SaveOrUpdateEvent event)在 NHibernate.Event.Default.DefaultSaveEventListener.PerformSaveOrUpdate(SaveOrUpdateEvent event)在 NHibernate.Event.Default.DefaultSaveOrUpdateEventListener.OnSaveOrUpdate(SaveOrUpdateEvent event)在 NHibernate.Impl.SessionImpl.FireSave(SaveOrUpdateEvent event)在 NHibernate.Impl.SessionImpl.Save(Object obj)在 DataBaseToEntity.DataBaseToEntityForm1.button1_Click(Object sender, EventArgs e) 位置 C:\Users\JianKunKing\Desktop\NHibernateStudy\NHibernateStudy\DataBaseToEntity\DataBaseToEntityForm1.cs:行號(hào) 31 --------------------------- 確定 ---------------------------

&nbsp&nbsp那么這樣的情況應(yīng)該處理呢？畢竟大多數(shù)的主鍵都是Guid類型的啊，此時(shí)須要改動(dòng)你模型主鍵的生成規(guī)則：

在這里改動(dòng)為guid類型的就能夠了

2、選擇主鍵的類型選擇int類型的時(shí)候：

&nbsp&nbsp此時(shí)通過實(shí)體操作數(shù)據(jù)是不須要填充主鍵字段的，你填充了也更新不進(jìn)去。

&nbsp&nbsp本文中有什么不正確的地方歡迎支出，謝謝

四、[NHibernate操作文檔及demo]

(http://download.csdn.net/detail/xunzaosiyecao/9398186)

作者：jiankunking 出處：http://blog.csdn.net/jiankunking

轉(zhuǎn)載于:https://www.cnblogs.com/gavanwanggw/p/7263388.html

創(chuàng)作挑戰(zhàn)賽新人創(chuàng)作獎(jiǎng)勵(lì)來咯，堅(jiān)持創(chuàng)作打卡瓜分現(xiàn)金大獎(jiǎng)

總結(jié)

以上是生活随笔為你收集整理的NHibernate利用Mindscape.NHibernateModelDesigner实现数据库与实体之间的转换及操作的全部內(nèi)容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網(wǎng)站內(nèi)容還不錯(cuò)，歡迎將生活随笔推薦給好友。

上一篇：《Java EE 7精粹》—— 第3章
下一篇： Harbor升级和数据库迁移手册