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如何在Web窗體應用程序中使用asp.net c#將Excel數據上載到具有自動遞增ID字段的SQL Server表中?

[英]How to upload Excel data into a SQL Server table with an auto incremented Id field using asp.net c# in a web forms application?

我閱讀了Mudassar Ahmed Khan的精彩文章,網址為http://www.aspsnippets.com/Articles/Import-Upload-CSV-file-data-to-SQL-Server-database-in-ASPNet-using-C-and -VBNet.aspx 它涵蓋了如何使用asp.net和C#將Excel文件上傳到SQL Server數據庫表中。

它工作得很好,但是我想讓它適用於Id列自動遞增的表。 我想知道如何修改代碼以允許用戶上傳文件而不必為Id列指定值。

任何幫助將不勝感激。

我按原樣使用上述教程中提供的代碼-我沒有做任何更改。 在嘗試將其應用於實際應用程序之前,我只是想了解如何。

如果需要提供其他信息,請告訴我。

任何幫助將不勝感激。

謝謝,J

這是我要修改的代碼:

protected void Upload(object sender, EventArgs e) {
   //Upload and save the file
   string excelPath = Server.MapPath("~/Files/") + Path.GetFileName(FileUpload1.PostedFile.FileName);
   FileUpload1.SaveAs(excelPath);

   string conString = string.Empty;
   string extension = Path.GetExtension(FileUpload1.PostedFile.FileName);

   switch (extension)
   {
       case ".xls": //Excel 97-03
          conString = ConfigurationManager.ConnectionStrings["Excel03ConString"].ConnectionString;
          break;

      case ".xlsx": //Excel 07 or higher
          conString = ConfigurationManager.ConnectionStrings["Excel07+ConString"].ConnectionString;
          break;
   }

   conString = string.Format(conString, excelPath);

   using (OleDbConnection excel_con = new OleDbConnection(conString))
   {
       excel_con.Open();
       string sheet1 = excel_con.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null).Rows[0]["TABLE_NAME"].ToString();
       DataTable dtExcelData = new DataTable();

       //[OPTIONAL]: It is recommended as otherwise the data will be considered as String by default.
       dtExcelData.Columns.AddRange(new DataColumn[3] { new DataColumn("Id", typeof(int)),
            new DataColumn("Name", typeof(string)),
            new DataColumn("Salary",typeof(decimal)) });

       using (OleDbDataAdapter oda = new OleDbDataAdapter("SELECT * FROM [" + sheet1 + "]", excel_con))
       {
           oda.Fill(dtExcelData);
       }

       excel_con.Close();

       string consString = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;

       using (SqlConnection con = new SqlConnection(consString))
       {
           using (SqlBulkCopy sqlBulkCopy = new SqlBulkCopy(con))
           {
                //Set the database table name
                sqlBulkCopy.DestinationTableName = "dbo.tblPersons";

                //[OPTIONAL]: Map the Excel columns with that of the database table
                sqlBulkCopy.ColumnMappings.Add("Id", "PersonId");
                sqlBulkCopy.ColumnMappings.Add("Name", "Name");
                sqlBulkCopy.ColumnMappings.Add("Salary", "Salary");

               con.Open();
               sqlBulkCopy.WriteToServer(dtExcelData);
               con.Close();
           }
       }
    }
}

這是aspx頁面標記:

<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:Button Text="Upload" OnClick = "Upload" runat="server" />

以下是Excel 2003和Excel 2007或更高版本格式的Excel特定連接字符串:

<add name = "Excel03ConString" connectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source={0};Extended Properties='Excel 8.0;HDR=YES'"/>
<add name = "Excel07+ConString" connectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties='Excel 8.0;HDR=YES'"/>

由於無法將標識列用於批量復制,因此可以將列添加到數據表中:

 //...
using (OleDbDataAdapter oda = new OleDbDataAdapter("SELECT * FROM [" + sheet1 + "]", excel_con))
{
    oda.Fill(dtExcelData);
}
excel_con.Close();

dtExcelData.Columns.Add("Id", typeof(int));

int i = 0;
foreach(DataRow dr in dtExcelData.Rows)
{
    dr["Id"] = ++i;  
}
//...

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