为什么我在 SQL Server 对象资源管理器中看不到由 UWP（桌面桥应用）创建的 localdb 数据库？

【问题标题】：Why can't I see a localdb database created by a UWP (Desktop Bridge App) in the SQL Server Object Explorer?为什么我在 SQL Server 对象资源管理器中看不到由 UWP（桌面桥应用）创建的 localdb 数据库？
【发布时间】：2019-05-23 08:51:00
【问题描述】：

UWP 是否支持 LocalDB？
我的调查表明使用 localdb 存在一些我在 SQL Server 2017 开发版中没有遇到的问题。

我设法将 winforms EF-Code First, xaf 应用程序转换为作为 UWP 应用程序运行 with the help of this blog

我设置了企业身份验证。

当我运行桌面桥应用程序时，它会在其中创建数据库和日志文件

c:\users\kirst

这是我的用户文件夹。

但是我无法在 SQL Server 对象资源管理器中看到新数据库

单击刷新没有帮助。

不使用桌面桥的类似应用程序也会在我的用户目录中创建数据库。在这种情况下，我 可以 还可以在 SQL Server 对象资源管理器中看到数据库 (localdb)\MSSQLLocalDB

在这两种情况下，连接字符串的格式为

"Integrated Security=SSPI;MultipleActiveResultSets=True;Data Source=(localdb)\mssqllocaldb;Initial Catalog=mydatabase"

和

providerName="System.Data.SqlClient"/>

我正在使用实体框架 6.2

.Net 框架 4.7.2

UWP 目标版本和最低版本 1809 Build 17763

我在 VS2017 15.9.4 IDE 中运行

在 c:\Program files\Microsoft SQL Server 中的 dos 提示符处

dir sqlservr.exe /s shows 2 files

一个在

c:\Program files\Microsoft SQL Server\130\LocalDB\Binn

一个在

c:\Program files\Microsoft SQL Server\MSSQL14.MSSQLSERVER\MSSQL\Binn

当我从程序中查询 @@Version 时，在这两种情况下我都看到了

Microsoft SQL Server 2016 (SP1) (KB3182545) - 13.0.4001.0 (X64)   
Oct 28 2016 18:17:30   Copyright (c) Microsoft Corporation  
Express Edition (64-bit) on Windows 10 Pro 6.3 <X64> 
(Build 17763: ) (Hypervisor)

如果我尝试从我的非 UWP 程序连接到由我的 UWP 应用创建的数据库，我会遇到问题

例如，此消息是关于文件夹中不存在的日志文件的消息。

This issue is linked

[更新1]

我设置了一个简单的问题演示on Github

将启动项目设置为 WAPProjThings（桌面桥）以运行它。

在演示中，如果我通过 Bridge 应用程序创建数据库作为启动然后切换到控制台应用程序运行，我得到

An unhandled exception of type 'System.Data.SqlClient.SqlException' occurred in EntityFramework.dll
Additional information: Cannot create file 'C:\Users\kirst\Things02.mdf' because it already exists. Change the file path or the file name, and retry the operation.
CREATE DATABASE failed. Some file names listed could not be created. Check related errors. occurred

如果我使用控制台应用程序创建数据库，然后尝试使用 Bridge 应用程序打开它，则错误是 

`System.Data.SqlClient.SqlException
  HResult=0x80131904
  Message=Cannot create file 'C:\Users\kirst\Things03.mdf' because it already exists. Change the file path or the file name, and retry the operation.
CREATE DATABASE failed. Some file names listed could not be created. Check related errors.
  Source=.Net SqlClient Data Provider
  StackTrace:
   at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
   at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
   at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
   at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)
   at System.Data.SqlClient.SqlCommand.RunExecuteNonQueryTds(String methodName, Boolean async, Int32 timeout, Boolean asyncWrite)
   at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(TaskCompletionSource`1 completion, String methodName, Boolean sendToPipe, Int32 timeout, Boolean& usedCache, Boolean asyncWrite, Boolean inRetry)
   at System.Data.SqlClient.SqlCommand.ExecuteNonQuery()
   at System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.<NonQuery>b__0(DbCommand t, DbCommandInterceptionContext`1 c)
   at System.Data.Entity.Infrastructure.Interception.InternalDispatcher`1.Dispatch[TTarget,TInterceptionContext,TResult](TTarget target, Func`3 operation, TInterceptionContext interceptionContext, Action`3 executing, Action`3 executed)
   at System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.NonQuery(DbCommand command, DbCommandInterceptionContext interceptionContext)
   at System.Data.Entity.SqlServer.SqlProviderServices.<>c__DisplayClass1a.<CreateDatabaseFromScript>b__19(DbConnection conn)
   at System.Data.Entity.SqlServer.SqlProviderServices.<>c__DisplayClass33.<UsingConnection>b__32()
   at System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.<>c__DisplayClass1.<Execute>b__0()
   at System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute[TResult](Func`1 operation)
   at System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute(Action operation)
   at System.Data.Entity.SqlServer.SqlProviderServices.UsingConnection(DbConnection sqlConnection, Action`1 act)
   at System.Data.Entity.SqlServer.SqlProviderServices.UsingMasterConnection(DbConnection sqlConnection, Action`1 act)
   at System.Data.Entity.SqlServer.SqlProviderServices.CreateDatabaseFromScript(Nullable`1 commandTimeout, DbConnection sqlConnection, String createDatabaseScript)
   at System.Data.Entity.SqlServer.SqlProviderServices.DbCreateDatabase(DbConnection connection, Nullable`1 commandTimeout, StoreItemCollection storeItemCollection)
   at System.Data.Entity.Core.Common.DbProviderServices.CreateDatabase(DbConnection connection, Nullable`1 commandTimeout, StoreItemCollection storeItemCollection)
   at System.Data.Entity.Core.Objects.ObjectContext.CreateDatabase()
   at System.Data.Entity.Migrations.Utilities.DatabaseCreator.Create(DbConnection connection)
   at System.Data.Entity.Migrations.DbMigrator.EnsureDatabaseExists(Action mustSucceedToKeepDatabase)
   at System.Data.Entity.Migrations.DbMigrator.Update(String targetMigration)
   at System.Data.Entity.Internal.DatabaseCreator.CreateDatabase(InternalContext internalContext, Func`3 createMigrator, ObjectContext objectContext)
   at System.Data.Entity.Internal.InternalContext.CreateDatabase(ObjectContext objectContext, DatabaseExistenceState existenceState)
   at System.Data.Entity.Database.Create(DatabaseExistenceState existenceState)
   at System.Data.Entity.CreateDatabaseIfNotExists`1.InitializeDatabase(TContext context)
   at System.Data.Entity.Internal.InternalContext.<>c__DisplayClassf`1.<CreateInitializationAction>b__e()
   at System.Data.Entity.Internal.InternalContext.PerformInitializationAction(Action action)
   at System.Data.Entity.Internal.InternalContext.PerformDatabaseInitialization()
   at System.Data.Entity.Internal.LazyInternalContext.<InitializeDatabase>b__4(InternalContext c)
   at System.Data.Entity.Internal.RetryAction`1.PerformAction(TInput input)
   at System.Data.Entity.Internal.LazyInternalContext.InitializeDatabaseAction(Action`1 action)
   at System.Data.Entity.Internal.LazyInternalContext.InitializeDatabase()
   at System.Data.Entity.Internal.InternalContext.Initialize()
   at System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType(Type entityType)
   at System.Data.Entity.Internal.Linq.InternalSet`1.Initialize()
   at System.Data.Entity.Internal.Linq.InternalSet`1.get_InternalContext()
   at System.Data.Entity.Infrastructure.DbQuery`1.System.Linq.IQueryable.get_Provider()
   at System.Linq.Queryable.FirstOrDefault[TSource](IQueryable`1 source)
   at ClassLibrary2.ThingFuncs.ThingDo() in C:\dev\Things\ClassLibrary2\ThingFuncs.cs:line 11
   at Things.Form1.Form1_Load(Object sender, EventArgs e) in C:\dev\Things\Things\Form1.cs:line 23
   at System.Windows.Forms.Form.OnLoad(EventArgs e)
   at System.Windows.Forms.Form.OnCreateControl()
   at System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible)
   at System.Windows.Forms.Control.CreateControl()
   at System.Windows.Forms.Control.WmShowWindow(Message& m)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
   at System.Windows.Forms.Form.WmShowWindow(Message& m)
   at System.Windows.Forms.Form.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
`I

[更新2]

我尝试调查 新 UWP 应用 - 非桌面网桥是否存在相同问题。 为此，我创建了一个包含 UWP 应用和 Framework 4.7.2 库的解决方案。 Nuget 让我将 Entity Framework 6.2 添加到这两个项目中。但是，当我尝试从 UWP 添加对库的引用时，我收到了一条消息

Unable to add a reference to project

紧随其后

The method or operation is not implemented

然后我收到了警告

Warning NU1701  Package 'EntityFramework 6.2.0' was restored using '.NETFramework,Version=v4.6.1'
instead of the project target framework 'UAP,Version=v10.0.17134'. 
This package may not be fully compatible with your project. App1    C:\dev\XThings2\App1\App1.csproj

[更新3]

我使用 UWP 类库创建了一个新的 UWP 应用程序来保存实体框架核心数据访问层。

但是当我尝试运行时，我收到一个错误提示

此平台不支持 LocalDB。

    System.PlatformNotSupportedException: LocalDB is not supported on this platform.
   at System.Data.SqlClient.SNI.LocalDB.GetLocalDBConnectionString(String localDbInstance)
   at System.Data.SqlClient.SNI.SNIProxy.GetLocalDBDataSource(String fullServerName, Boolean& error)
   at System.Data.SqlClient.SNI.SNIProxy.CreateConnectionHandle(Object callbackObject, String fullServerName, Boolean ignoreSniOpenTimeout, Int64 timerExpire, Byte[]& instanceName, Byte[]& spnBuffer, Boolean flushCache, Boolean async, Boolean parallel, Boolean isIntegratedSecurity)
   at System.Data.SqlClient.SNI.TdsParserStateObjectManaged.CreatePhysicalSNIHandle(String serverName, Boolean ignoreSniOpenTimeout, Int64 timerExpire, Byte[]& instanceName, Byte[]& spnBuffer, Boolean flushCache, Boolean async, Boolean parallel, Boolean isIntegratedSecurity)
   at System.Data.SqlClient.TdsParser.Connect(ServerInfo serverInfo, SqlInternalConnectionTds connHandler, Boolean ignoreSniOpenTimeout, Int64 timerExpire, Boolean encrypt, Boolean trustServerCert, Boolean integratedSecurity, Boolean withFailover)
   at System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo serverInfo, String newPassword, SecureString newSecurePassword, Boolean ignoreSniOpenTimeout, TimeoutTimer timeout, Boolean withFailover)
   at System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(ServerInfo serverInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString connectionOptions, SqlCredential credential, TimeoutTimer timeout)
   at System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(TimeoutTimer timeout, SqlConnectionString connectionOptions, SqlCredential credential, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance)
   at System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, SqlCredential credential, Object providerInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString userConnectionOptions, SessionData reconnectSessionData, Boolean applyTransientFaultHandling, String accessToken)
   at System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, DbConnectionPoolKey poolKey, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection, DbConnectionOptions userOptions)
   at System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnectionPool pool, DbConnection owningObject, DbConnectionOptions options, DbConnectionPoolKey poolKey, DbConnectionOptions userOptions)
   at System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection)
   at System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection)
   at System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal& connection)
   at System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection)
   at System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection)
   at System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)
   at System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)
   at System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry)
   at System.Data.SqlClient.SqlConnection.Open()
   at Microsoft.EntityFrameworkCore.Storage.RelationalConnection.OpenDbConnection(Boolean errorsExpected)
   at Microsoft.EntityFrameworkCore.Storage.RelationalConnection.Open(Boolean errorsExpected)
   at Microsoft.EntityFrameworkCore.Storage.RelationalConnection.BeginTransaction(IsolationLevel isolationLevel)
   at Microsoft.EntityFrameworkCore.Storage.RelationalConnection.BeginTransaction()
   at Microsoft.EntityFrameworkCore.Update.Internal.BatchExecutor.Execute(DbContext _, ValueTuple`2 parameters)
   at Microsoft.EntityFrameworkCore.SqlServer.Storage.Internal.SqlServerExecutionStrategy.Execute[TState,TResult](TState state, Func`3 operation, Func`3 verifySucceeded)
   at Microsoft.EntityFrameworkCore.Update.Internal.BatchExecutor.Execute(IEnumerable`1 commandBatches, IRelationalConnection connection)
   at Microsoft.EntityFrameworkCore.Storage.RelationalDatabase.SaveChanges(IReadOnlyList`1 entries)
   at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.SaveChanges(IReadOnlyList`1 entriesToSave)
   at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.SaveChanges(Boolean acceptAllChangesOnSuccess)
   at Microsoft.EntityFrameworkCore.DbContext.SaveChanges(Boolean acceptAllChangesOnSuccess)
   at Microsoft.EntityFrameworkCore.DbContext.SaveChanges()
   at Data.ThingFuncs.ThingDo()

[更新4]

回到我原来的程序，我发现 UWP 应用程序的创建数据库行为在发布模式下运行与在调试模式下运行时是不同的。

当通过 Bridge 项目在发布模式下运行时，CheckDatabaseCompatibility 不会触发 xaf DatabaseVersionMismatch 事件。在控制台项目中以发布模式运行时，它会这样做。 （SQL Server Developer 版本也会出现这种特殊行为）可能我应该把它写成一个单独的问题，但我在这里提到它以防它被链接。

【问题讨论】：

  • 如果没有修改配置，则数据库路径为(localdb)\mssqllocaldb，目前为c:\users\kirst。它们是一样的吗？
  • 是的，数据库在 c:\users\kirst 中为两者创建。
  • 我想知道是否将我的发现记录在 [Update1] 之后作为第二个问题，但我怀疑这两个问题是由同一件事引起的...... EF2 与桌面桥交互的某种错误跨度>
  • docs.microsoft.com/en-us/windows/uwp/data-access/…
  • 不确定它是否有效并且可能听起来很假，因为我不知道 localdb，但只是为了澄清一下，您是否尝试将您的 db 文件移动到除c:\users\kirst 之外的其他位置？比如c:\users\kirst\AppData\Local\Packages\YourDesktopBridgeAppName\LocalState。

标签： entity-framework-6 xaf desktop-bridge sql-server-2016-localdb


【解决方案1】：

我得出的结论是 localdb 不是 SQL Server 的生产支持版本。

As explained here

LocalDB 是 SQL Server 引擎的一个特殊的低影响版本，它不作为 Windows 服务安装，而是由 ADO.NET 客户端打开与它的连接按需启动（运行）。它适用于单用户场景，不适用于任何生产用途 - 对于生产，您应该使用 SQL Server Express（或更高版本）

【讨论】：

    【解决方案2】：

    有一种方法可以将 UWP 连接到 localdb，您必须使用 winforms sql 数据工厂方法问题是虽然您可以访问 System.Data.SQLClient，但您没有 SqlDataAdapter，因此您无法创建用户登录系统。但是，您可以从数据库中读取数据并创建 ObservableCollections。为了节省您的时间，适配器客户端也不起作用。我认为我们必须等待已添加所有 SQL 库的另一个更新。

    【讨论】：

    • 谢谢，但是我的问题是我在 sql server 对象资源管理器中看不到 localdb。我能够连接。
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