SqlBulkCopy插入null而不是雙重

我試圖導入excel文件到我的網站，然後將其內容保存在sql服務器我的問題與sqlbulkcopy當它填充數據庫的一些列填充錯誤值是NULL！而列中有一個非空的double值！SqlBulkCopy插入null而不是雙重

這裏是代碼：

  void ImporttoDatatable() 
{ 

    try 
    { 
     if (FileUpload3.HasFile) 
     { 
      string FileName = FileUpload3.FileName; 
      string path = Path.Combine(Server.MapPath("~/ImportDocument"), Guid.NewGuid().ToString() + Path.GetExtension(FileUpload3.PostedFile.FileName)); 


      FileUpload3.PostedFile.SaveAs(path); 




      using (OleDbConnection OleDbcon = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + path + "; Extended Properties = \"Excel 8.0;HDR=Yes;IMEX=2\" ")) 
      { 


       conn.Open(); 
       OleDbcon.Open(); 
       OleDbCommand command = new OleDbCommand("Select [IdOftable], [Time],[InstrumentLeftHand],[LeftSwitch],[LeftKnob],[ForceFeedbackLeftHand],[CumTimeLeftForceOverThreshold],[CumTimeLeftForceOver2xThreshold],[TranslationLeft_x],[TranslationLeft_y],[TranslationLeft_z],[quatLeft_x],[quatLeft_y],[quatLeft_z],[quatLeft_w],[InstrumentRightHand],[RightSwitch],[RightKnob],[ForceFeedbackRightHand],[CumTimeRightForceOverThreshold],[CumTimeRightForceOver2xThreshold],[TranslationRight_x],[TranslationRight_y],[TranslationRight_z],[quatRight_x],[quatRight_y],[quatRight_z],[quatRight_w],[BloodEmittedFrame],[BloodCurrentFrame],[TotalBloodEmitted],[TotalWhiteFibreCut],[TotalRedFibreCut],[Volume0_Brain],[Volume1_Tumor],[Volume2_Tumor] from [Sheet1$]", OleDbcon); 

       //OleDbDataAdapter objAdapter1 = new OleDbDataAdapter(command); 
       DbDataReader dr = command.ExecuteReader(); 
       using (SqlBulkCopy bulkCopy = new SqlBulkCopy(conn)) 
       { 
       bulkCopy.DestinationTableName = "MyExcel"; 
        try 
        { 
         bulkCopy.BulkCopyTimeout = 400; 
         bulkCopy.WriteToServer(dr); 
         bulkCopy.BatchSize = 16000; 
        } 
        catch (Exception ex) 
        { 
         Response.Write(ex.ToString()); 
        } 
        finally 
        { 
         dr.Close(); 
        } 
        OleDbcon.Close(); 
        bulkCopy.Close(); 

       } 
      } 
     } lblmessage.Text = "The File Succssesfully Imported "; 
    } 
    catch (Exception ex) 
    { 
     Response.Write(ex.ToString()); 
    } 
}

，這是SQL表定義：

 CREATE TABLE [dbo].[MyExcel] (
[IdOftable]      NVARCHAR (50) NOT NULL, 
[Time]        FLOAT (53) NULL, 
[InstrumentLeftHand]    NVARCHAR (50) NULL, 
[LeftSwitch]      FLOAT (53) NULL, 
[LeftKnob]       FLOAT (53) NULL, 
[ForceFeedbackLeftHand]   FLOAT (53) NULL, 
[CumTimeLeftForceOverThreshold] FLOAT (53) NULL, 
[CumTimeLeftForceOver2xThreshold] FLOAT (53) NULL, 
[TranslationLeft_x]    FLOAT (53) NULL, 
[TranslationLeft_y]    FLOAT (53) NULL, 
[TranslationLeft_z]    FLOAT (53) NULL, 
[quatLeft_x]      FLOAT (53) NULL, 
[quatLeft_y]      FLOAT (53) NULL, 
[quatLeft_z]      FLOAT (53) NULL, 
[quatLeft_w]      FLOAT (53) NULL, 
[InstrumentRightHand]    NVARCHAR (50) NULL, 
[RightSwitch]      FLOAT (53) NULL, 
[RightKnob]      FLOAT (53) NULL, 
[ForceFeedbackRightHand]   FLOAT (53) NULL, 
[CumTimeRightForceOverThreshold] FLOAT (53) NULL, 
[CumTimeRightForceOver2xThreshold] FLOAT (53) NULL, 
[TranslationRight_x]    FLOAT (53) NULL, 
[TranslationRight_y]    FLOAT (53) NULL, 
[TranslationRight_z]    FLOAT (53) NULL, 
[quatRight_x]      FLOAT (53) NULL, 
[quatRight_y]      FLOAT (53) NULL, 
[quatRight_z]      FLOAT (53) NULL, 
[quatRight_w]      FLOAT (53) NULL, 
[BloodEmittedFrame]    NVARCHAR (50) NULL, 
[BloodCurrentFrame]    FLOAT (53) NULL, 
[TotalBloodEmitted]    FLOAT (53) NULL, 
[TotalWhiteFibreCut]    FLOAT (53) NULL, 
[TotalRedFibreCut]     FLOAT (53) NULL, 
[Volume0_Brain]     FLOAT (53) NULL, 
[Volume1_Tumor]     FLOAT (53) NULL, 
[Volume2_Tumor ]     FLOAT (53) NULL, 
PRIMARY KEY CLUSTERED ([IdOftable] ASC) 
);

有，當我跑的代碼，但沒有例外，當我檢查了數據的服務器裏面有一些值不爲空值=（

我使用visual studio express 2012 for web。怎麼辦才能糾正它？

謝謝

來源

2014-11-06 seetah

但除了一個所有的字段可以有NULL值... – e4rthdog 2014-11-06 08:38:02

我沒有檢查的'SqlBulkCopy.WriteToServer（IDataReader的）內部工作'，但我的猜測是，由於從電子表格讀不給一個強類型的讀者，在那裏我是一個相當寬鬆的轉換器，在轉換失敗時使用'DbNull'。我昨天遇到了這個問題，並發現添加額外的代碼來顯式迭代讀者，並用顯式轉換填充一個強類型的'DataTable'，然後將這個表寫入服務器的速度比試圖反映.NET更快準確找出發生這種情況的原因。 – GarethD 2014-11-06 08:40:07

@ e4rthdog謝謝你的回覆，但是當我改變它不爲null異常「system.invalidoperationexception列」列名'不允許dbnull.value「會出現這意味着相同的問題出來與null或沒有它=（ – seetah 2014-11-06 09:33:20

感謝大家的幫助終於它與我的作品時，我用什麼@GarethD說

我會後編輯的代碼在任何人的情況下，需要：

string name = (string)(Session["LoginUserName"]); 
    if(FileUpload3.FileName == null){ 

    lblmessage.Text = "Choose the file First then click import "; 
    string display = "    Choose the file First then click import     "; 
    ClientScript.RegisterStartupScript(this.GetType(), "myalert", "alert('" + display + "');", true); 
    } 
    else 
    { 


     string path = Path.Combine(Server.MapPath("~/ImportDocument"), Guid.NewGuid().ToString() + name + Path.GetExtension(FileUpload3.PostedFile.FileName)); 


    FileUpload3.PostedFile.SaveAs(path); 
    OleDbConnection dbConnection = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + path + "; Extended Properties = \"Excel 8.0;HDR=Yes;IMEX=2\" "); 
    dbConnection.Open(); 
    try 
    {  

     // Get the name of the first worksheet: 
     DataTable dbSchema = dbConnection.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null); 
     if (dbSchema == null || dbSchema.Rows.Count < 1) 
     { 
      throw new Exception("Error: Could not determine the name of the first worksheet."); 
     } 
     string firstSheetName = dbSchema.Rows[0]["TABLE_NAME"].ToString(); 

     // Now we have the table name; proceed as before: 
     OleDbCommand dbCommand = new OleDbCommand("Select [IdOftable], [Time],[InstrumentLeftHand],[LeftSwitch],[LeftKnob],[ForceFeedbackLeftHand],[CumTimeLeftForceOverThreshold],[CumTimeLeftForceOver2xThreshold],[TranslationLeft_x],[TranslationLeft_y],[TranslationLeft_z],[quatLeft_x],[quatLeft_y],[quatLeft_z],[quatLeft_w],[InstrumentRightHand],[RightSwitch],[RightKnob],[ForceFeedbackRightHand],[CumTimeRightForceOverThreshold],[CumTimeRightForceOver2xThreshold],[TranslationRight_x],[TranslationRight_y],[TranslationRight_z],[quatRight_x],[quatRight_y],[quatRight_z],[quatRight_w],[BloodEmittedFrame],[BloodCurrentFrame],[TotalBloodEmitted],[TotalWhiteFibreCut],[TotalRedFibreCut],[Volume0_Brain],[Volume1_Tumor],[Volume2_Tumor] from [" + firstSheetName + "]", dbConnection); 
     OleDbDataReader dbReader = dbCommand.ExecuteReader(); 

     using (SqlBulkCopy bulkCopy = new SqlBulkCopy(conn)) 
     { 

      bulkCopy.DestinationTableName = "MyExcel"; 
      try 
      { 
       conn.Open(); 
       bulkCopy.BulkCopyTimeout = 400; 
       bulkCopy.WriteToServer(dbReader); 
       bulkCopy.BatchSize = 16000; 
       conn.Close(); 

      } 

      catch (Exception ex) 
      { 
       Response.Write(ex.ToString()); 
      } 
      finally 
      { 
       bulkCopy.Close(); 
       dbReader.Close(); 
       //lblmessage.Text = " data successfully imported "; 
      // Response.Write(@"<script language=""javascript"">alert('Details saved successfully')</script>"); 
       string display = "    Data Duccessfully Imported Now Click On Calculate the result to calculate your results taking in your account The calculation will take a while , please wait "; 
       ClientScript.RegisterStartupScript(this.GetType(), "myalert", "alert('" + display + "');", true); 
      } 



     } 
    } 
    finally 
    { 
     dbConnection.Close(); 
    } 
}

來源

2014-11-09 08:27:26 seetah

SqlBulkCopy插入null而不是雙重

回答

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