实体框架抛出“System.Data.EntityException：底层提供程序在打开时失败。”在移动 10k+ 条记录时

【问题标题】：Entity Framework throws "System.Data.EntityException: The underlying provider failed on Open." while moving 10k+ records实体框架抛出“System.Data.EntityException：底层提供程序在打开时失败。”在移动 10k+ 条记录时
【发布时间】：2010-10-23 07:14:58
【问题描述】：

我有一个应用程序，我在同一个数据库中将数据从一个表移动到另一个表（完成了一些简单的计算）。我使用实体框架从第一个表中选择数据并将其添加到另一个表中。我尝试传输appx。 100k 行，问题是它似乎终止了与我的数据库的连接。运行一段时间后，我收到以下错误。有谁知道为什么会发生这种情况？ 注意。我正在运行 ms 2008 express。

See the end of this message for details on invoking 
just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************
System.Data.EntityException: The underlying provider failed on Open. ---> System.Data.SqlClient.SqlException: A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: TCP Provider, error: 0 - No connection could be made because the target machine actively refused it.)
   at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection)
   at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj)
   at System.Data.SqlClient.TdsParser.Connect(ServerInfo serverInfo, SqlInternalConnectionTds connHandler, Boolean ignoreSniOpenTimeout, Int64 timerExpire, Boolean encrypt, Boolean trustServerCert, Boolean integratedSecurity, SqlConnection owningObject)
   at System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo serverInfo, String newPassword, Boolean ignoreSniOpenTimeout, Int64 timerExpire, SqlConnection owningObject)
   at System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(String host, String newPassword, Boolean redirectedUserInstance, SqlConnection owningObject, SqlConnectionString connectionOptions, Int64 timerStart)
   at System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(SqlConnection owningObject, SqlConnectionString connectionOptions, String newPassword, Boolean redirectedUserInstance)
   at System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, Object providerInfo, String newPassword, SqlConnection owningObject, Boolean redirectedUserInstance)
   at System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection)
   at System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnection owningConnection, DbConnectionPool pool, DbConnectionOptions options)
   at System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject)
   at System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject)
   at System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject)
   at System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection)
   at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory)
   at System.Data.SqlClient.SqlConnection.Open()
   at System.Data.EntityClient.EntityConnection.OpenStoreConnectionIf(Boolean openCondition, DbConnection storeConnectionToOpen, DbConnection originalConnection, String exceptionCode, String attemptedOperation, Boolean& closeStoreConnectionOnFailure)
   --- End of inner exception stack trace ---
   at System.Data.EntityClient.EntityConnection.OpenStoreConnectionIf(Boolean openCondition, DbConnection storeConnectionToOpen, DbConnection originalConnection, String exceptionCode, String attemptedOperation, Boolean& closeStoreConnectionOnFailure)
   at System.Data.EntityClient.EntityConnection.Open()
   at System.Data.Objects.ObjectContext.EnsureConnection()
   at System.Data.Objects.ObjectQuery`1.GetResults(Nullable`1 forMergeOption)
   at System.Data.Objects.ObjectQuery`1.System.Collections.Generic.IEnumerable<T>.GetEnumerator()
   at System.Linq.Enumerable.First[TSource](IEnumerable`1 source)
   at System.Data.Objects.ELinq.ObjectQueryProvider.<GetElementFunction>b__0[TResult](IEnumerable`1 sequence)
   at System.Data.Objects.ELinq.ObjectQueryProvider.ExecuteSingle[TResult](IEnumerable`1 query, Expression queryRoot)
   at System.Data.Objects.ELinq.ObjectQueryProvider.System.Linq.IQueryProvider.Execute[S](Expression expression)
   at System.Linq.Queryable.First[TSource](IQueryable`1 source)
   at DataExtractProgram.Form1.ect()
   at System.Windows.Forms.Control.OnClick(EventArgs e)
   at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ButtonBase.WndProc(Message& m)
   at System.Windows.Forms.Button.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)


************** Loaded Assemblies **************
mscorlib
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
    CodeBase: file:///C:/WINDOWS/Microsoft.NET/Framework64/v2.0.50727/mscorlib.dll
----------------------------------------
DataExtractProgram
    Assembly Version: 1.0.0.0
    Win32 Version: 1.0.0.0
    CodeBase: file:///C:/Documents%20and%20Settings/Administrator/Local%20Settings/Apps/2.0/6LPXQTY9.K57/NMK5LWCH.01M/data..tion_edf9c07719516f7e_0001.0000_b19bec20c89bf848/DataExtractProgram.exe
----------------------------------------
System.Windows.Forms
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
    CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Windows.Forms/2.0.0.0__b77a5c561934e089/System.Windows.Forms.dll
----------------------------------------
System
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
    CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System/2.0.0.0__b77a5c561934e089/System.dll
----------------------------------------
System.Drawing
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
    CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Drawing/2.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll
----------------------------------------
DataLayer
    Assembly Version: 1.0.0.0
    Win32 Version: 1.0.0.0
    CodeBase: file:///C:/Documents%20and%20Settings/Administrator/Local%20Settings/Apps/2.0/6LPXQTY9.K57/NMK5LWCH.01M/data..tion_edf9c07719516f7e_0001.0000_b19bec20c89bf848/DataLayer.DLL
----------------------------------------
System.Data.Entity
    Assembly Version: 3.5.0.0
    Win32 Version: 3.5.30729.1 built by: SP
    CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Data.Entity/3.5.0.0__b77a5c561934e089/System.Data.Entity.dll
----------------------------------------
System.Core
    Assembly Version: 3.5.0.0
    Win32 Version: 3.5.30729.1 built by: SP
    CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Core/3.5.0.0__b77a5c561934e089/System.Core.dll
----------------------------------------
BusinessLayer
    Assembly Version: 1.0.0.0
    Win32 Version: 1.0.0.0
    CodeBase: file:///C:/Documents%20and%20Settings/Administrator/Local%20Settings/Apps/2.0/6LPXQTY9.K57/NMK5LWCH.01M/data..tion_edf9c07719516f7e_0001.0000_b19bec20c89bf848/BusinessLayer.DLL
----------------------------------------
System.Data
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
    CodeBase: file:///C:/WINDOWS/assembly/GAC_64/System.Data/2.0.0.0__b77a5c561934e089/System.Data.dll
----------------------------------------
System.Configuration
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
    CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Configuration/2.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll
----------------------------------------
System.Xml
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
    CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Xml/2.0.0.0__b77a5c561934e089/System.Xml.dll
----------------------------------------
System.Web
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
    CodeBase: file:///C:/WINDOWS/assembly/GAC_64/System.Web/2.0.0.0__b03f5f7f11d50a3a/System.Web.dll
----------------------------------------
System.Runtime.Serialization
    Assembly Version: 3.0.0.0
    Win32 Version: 3.0.4506.2152 (SP.030729-0100)
    CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Runtime.Serialization/3.0.0.0__b77a5c561934e089/System.Runtime.Serialization.dll
----------------------------------------
System.Transactions
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
    CodeBase: file:///C:/WINDOWS/assembly/GAC_64/System.Transactions/2.0.0.0__b77a5c561934e089/System.Transactions.dll
----------------------------------------
System.EnterpriseServices
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
    CodeBase: file:///C:/WINDOWS/assembly/GAC_64/System.EnterpriseServices/2.0.0.0__b03f5f7f11d50a3a/System.EnterpriseServices.dll
----------------------------------------
Anonymously Hosted DynamicMethods Assembly
    Assembly Version: 0.0.0.0
    Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
    CodeBase: file:///C:/WINDOWS/assembly/GAC_64/mscorlib/2.0.0.0__b77a5c561934e089/mscorlib.dll
----------------------------------------

************** JIT Debugging **************
To enable just-in-time (JIT) debugging, the .config file for this
application or computer (machine.config) must have the
jitDebugging value set in the system.windows.forms section.
The application must also be compiled with debugging
enabled.

For example:

<configuration>
    <system.windows.forms jitDebugging="true" />
</configuration>

When JIT debugging is enabled, any unhandled exception
will be sent to the JIT debugger registered on the computer
rather than be handled by this dialog box.

【问题讨论】：

    标签： sql entity-framework


    【解决方案1】：

    我将数据从同一个数据库的一个表移动到另一个表（做了一些简单的计算）

    我不确定你为什么不这样做：

    insert into destination_table( a, c, f, m, n, p)
select a, b, c, d + e, f * c + .1 * b, g || h 
from source_table
where some_predicate;

    也就是说，包括你在选择中的所有计算。

    【讨论】：

    • 一些计算可以在 SP 中完成，但我其中有一个包含汽车的字符串，例如奥迪 100，我需要在包含不同定义的表中找到对应的 ID（表包含：id、汽车、型号）。使用实体框架和 linq 更容易做到这一点。这在 SP 中是否可以轻松实现？
    • 子选择或连接：从 source_table 中选择 a.*, (select id from cartable b where model = a.model)，或者从 source-table a left 中选择 a.*, b.id外部连接 cartable b on (a.something = b.model)
    • 但是我有一张表，其中包含一个字段“Audi 100”，所以我不能只加入模型，因为我需要从该字符串中找到包含模型和公司的 carddefinitionId，并且我不能使用 Select CarDefinitionId from dbo.CarModelDefinition where CONTAINS(Model,@Cardefinition) AND Contains(Company, @Cardefinition) 因为公司或模型都不是 PK（我收到错误：Cannot use a CONTAINS or FREETEXT predicate on表或索引视图“dbo.CarModelDefinition”，因为它不是全文索引。）
    【解决方案2】：

    很难说，但看看轰炸时哪些连接处于活动状态会很有趣......也许它以某种方式产生了多个......

    但是；对于传输海量数据，我通常会推荐一个存储过程（如果可以在数据库中完成处理） - 或者如果你需要更丰富的代码，比如 SqlBulkCopy 挂钩到 IDataReader - 这将允许你以最小的缓冲/开销将数据从一个表流式传输到另一个表。

    将任意数据源表示为IDataReader（提供给SqlBulkCopy）是一件很痛苦的事情，但您可以使用SimpleDataReader。您还可以在源 SqlCommand 上使用 ExecuteReader 来使用来自源的数据。

    【讨论】：

    • 不幸的是，我需要做的计算不能在存储过程中完成。
    • 我可能会尝试使用 SqlBulkCopy，但只是认为实体框架可以做到，因为它只有 100k 行。
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