Question

我在我的应用程序中使用bootstrap。我在sql db中存储一个excel文件。

这是我的代码;

Default.aspx

 <div class="control-group">
  <label class="control-label">
   Upload</label>
  <div class="controls">
   <input id="fileupload" type="file" runat="server"/>
  </div>
 </div>
<asp:Button ID="btnSave" runat="server" OnClick="btnSave_Click"  />

Default.aspx.cs

  protected void btnSave_Click(object sender, EventArgs e)
    {               
            string filePath = Server.MapPath("~/Upload/");
            HttpFileCollection hfc = Request.Files;

            if (!Directory.Exists(filePath))
            {
                Directory.CreateDirectory(filePath);
            }          
            if (hfc.Count != 0)
            {
                string contenttype = String.Empty;

                    HttpPostedFile hpf = hfc[i];

                    string fileExtn = Path.GetExtension(hfc[i].FileName).ToLower();

                    if (fileExtn == ".xls" || fileExtn == ".xlsx" || fileExtn == ".xlmx")
                    {                      
                        switch (fileExtn)
                        {

                            case ".xls":

                                contenttype = "application/excel";

                                break;

                            case ".xlsx":

                                contenttype = "application/excel";

                                break;

                            case ".xlmx":

                                contenttype = "application/excel";

                                break;
                        }

                        if (hpf.ContentLength > 0)
                        {
                            string SPfilePath = Server.MapPath("~/Upload/");
                            string filepath = SPfilePath + System.IO.Path.GetFileName(hpf.FileName);
                            hpf.SaveAs(filepath);                                                       
                            string ContentType = hpf.ContentType;
                            int fileLen = hpf.ContentLength;
                            byte[] fileBytes = new byte[fileLen - 1];
                            hpf.InputStream.Read(fileBytes, 0, fileBytes.Length);
                             byte[] Data = fileBytes;                     
                        }
                       new DefaultManager().SaveFile(Data , fileLen ,filepath ,ContentType );
                }
            }
            UploadMsg = auditmgr.AddClientAuditReport(, audit);         
        }
    }

此处我将ContentType保存为varchar(256)，将filepath保存为varchar(256)，将fileLen保存为int，将Data保存为varchar(max)在db中1}}它正在db中添加。但我不知道如何从db检索该excel文件。

我在SQL db中以字节为单位存储excel文件

Answer 1

首先将“Data as varchar（max）”的数据类型更改为varbinary（max），然后将文件内容保存到数据库中

//对于数据库中的retrival文件，您可以使用此代码

DataTable dt = GetFileDetailFromDatabase(fileID: 20); // here you select data from database, for Ex. fileID is 20

string strpath = @"C:\Download\" + dt.Rows[0]["FileName"].ToString(); // if you are storing file name(Only file name with extension not full file path) in database other wise give any temp file name with same extension which file had at the time of save in database

FileStream flStrm = new FileStream(strpath, FileMode.Create);
Byte[] Buffer = (Byte[])dt.Rows[0]["Data"];
flStrm.Write(Buffer, 0, Buffer.Length);
flStrm.Close();
Buffer = null;

Answer 2

 DataTable dtReport = GetDataFromDatabase(fileID: 20);     
 Response.Clear();
 Response.Buffer = true;
 Response.ContentType = Path.GetExtension(dtReport["FileName"]).ToString();
 Response.AddHeader("content-disposition", "attachment;filename=" + Path.GetFileName(dtReport["FileName"]).ToString());
 Response.ContentType = Path.GetExtension(dtReport["FileName"]).ToString();
 Response.Charset = "";
 Response.Cache.SetCacheability(HttpCacheability.NoCache);
 Response.BinaryWrite((byte[])dtReport["Data"]);
 Response.End();

如何从sql数据库中检索excel文件

2 个答案: