致命錯誤讀取

我做的定期更新表掃描致命錯誤讀取

Using connect1 As New MySqlConnection(ConnectLocalhost.serverString) 
    connect1.Open() 
    Dim cmd = New MySqlCommand("set net_write_timeout=99999; set net_read_timeout=99999", connect1) ' // Setting tiimeout on mysqlServer 
    cmd.ExecuteNonQuery() 

    Dim BusinessReader = selectSomeQuery("Select * from tablebusiness limit 800,10000000", connect1) 

    Do While BusinessReader.Read 'random exception here

有時候，我得到這個錯誤

MySql.Data.MySqlClient.MySqlException was unhandled 
    ErrorCode=-2147467259 
    Message=Fatal error encountered during data read. 
    Number=0 
    Source=MySql.Data 
    StackTrace: 
     at MySql.Data.MySqlClient.MySqlDataReader.Read() 
     at dreamhost.Business.InsertLocalhost() in \\work\c\business\fromwork\currentprojects\program\library\vb.net\badger.vb:line 1849 
     at dreamhost.Business.surFoursquare() in \\work\c\business\fromwork\currentprojects\program\library\vb.net\badger.vb:line 1939 
     at dreamhost.traverseweb._Lambda$__92() in \\work\c\business\fromwork\currentprojects\program\library\vb.net\traverseweb.vb:line 77 
     at dreamhost.buttonClicking.startAndStopClickingButton(Object sender, Action SomeSub) in \\work\c\business\fromwork\currentprojects\program\library\vb.net\buttonclicking.vb:line 45 
     at dreamhost.traverseweb.foursquare_Click(Object sender, EventArgs e) in \\work\c\business\fromwork\currentprojects\program\library\vb.net\traverseweb.vb:line 77 
     at System.Windows.Forms.Control.OnClick(EventArgs e) 
     at System.Windows.Forms.Button.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.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) 
     at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg) 
     at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData) 
     at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context) 
     at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context) 
     at System.Windows.Forms.Application.Run(ApplicationContext context) 
     at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnRun() 
     at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.DoApplicationModel() 
     at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Run(String[] commandLine) 
     at dreamhost.My.MyApplication.Main(String[] Args) in 17d14f5c-a337-4978-8281-53493378c1071.vb:line 81 
     at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args) 
     at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args) 
     at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() 
     at System.Threading.ThreadHelper.ThreadStart_Context(Object state) 
     at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx) 
     at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) 
     at System.Threading.ThreadHelper.ThreadStart() 
    InnerException: MySql.Data.MySqlClient.MySqlException 
     ErrorCode=-2147467259 
     Message=Reading from the stream has failed. 
     Number=0 
     Source=MySql.Data 
     StackTrace: 
      at MySql.Data.MySqlClient.MySqlStream.LoadPacket() 
      at MySql.Data.MySqlClient.MySqlStream.ReadPacket() 
      at MySql.Data.MySqlClient.NativeDriver.FetchDataRow(Int32 statementId, Int32 columns) 
      at MySql.Data.MySqlClient.Driver.FetchDataRow(Int32 statementId, Int32 columns) 
      at MySql.Data.MySqlClient.ResultSet.GetNextRow() 
      at MySql.Data.MySqlClient.ResultSet.NextRow(CommandBehavior behavior) 
      at MySql.Data.MySqlClient.MySqlDataReader.Read() 
     InnerException: System.IO.IOException 
      Message=Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. 
      Source=MySql.Data 
      StackTrace: 
       at MyNetworkStream.HandleOrRethrowException(Exception e) 
       at MyNetworkStream.Read(Byte[] buffer, Int32 offset, Int32 count) 
       at MySql.Data.MySqlClient.TimedStream.Read(Byte[] buffer, Int32 offset, Int32 count) 
       at System.IO.BufferedStream.Read(Byte[] array, Int32 offset, Int32 count) 
       at MySql.Data.MySqlClient.MySqlStream.ReadFully(Stream stream, Byte[] buffer, Int32 offset, Int32 count) 
       at MySql.Data.MySqlClient.MySqlStream.LoadPacket() 
      InnerException: System.Net.Sockets.SocketException 
       ErrorCode=10054 
       Message=An existing connection was forcibly closed by the remote host 
       NativeErrorCode=10054 
       Source=System 
       StackTrace: 
         at System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags) 
         at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size) 
       InnerException:

所有我想要的是程序只是「繼續」時，這事情發生。但那似乎是不可能的。所以我想我需要一種方法來確保這個錯誤不會發生。它隨機發生800個條目左右。

在我看來，連接被遠程主機強制關閉。在那種情況下，我只想去事情發生的地方，然後重新開始。

來源

2012-06-21 J. Chang

可能重複（http://stackoverflow.com/questions/2546115/mysql-exception-fatal-error-encountered-during-數據讀取） – nawfal

可能有很多原因導致連接丟失（服務器負載，網絡問題等）。您的程序崩潰表明您的數據庫代碼不受try聲明的保護。如果你做這樣的事情：

try 
    Using connect1 As New MySqlConnection(ConnectLocalhost.serverString) 
     connect1.Open() 
     Dim cmd = New MySqlCommand("set net_write_timeout=99999; _ 
      set net_read_timeout=99999", connect1) 
     cmd.ExecuteNonQuery() 

     Dim BusinessReader = selectSomeQuery("Select *...", connect1) 

     Do While BusinessReader.Read 
      'random exception here' 
      '...more code' 
     Loop 
    End Using 
Catch ex As Exception 
    ' code breaks here on exception - recover from this point ' 
End Try

我不會進入異常處理曠日持久的論文，但也有很多的資源在那裏，如果你看看。你如何處理它將取決於你的具體情況 - 是否記錄異常，記錄最後一次成功的操作，是否嘗試從原來的位置恢復，或者是否嘗試再次完成整個事情，通知用戶等

MSDN - Try/Catch/Finally

[MySQL的異常 - 致命錯誤期間遇到數據讀取]的

來源

2012-06-21 13:17:27

致命錯誤讀取

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