在数据库中 保存和获取各种文件

http://www.aspsnippets.com/Articles/How-to-save-insert-Image-in-Database-in-ASPNet-using-C-and-VBNet.aspx

1.创建数据库--各字段如下图所示

 

注：Name：文件名

ContentType:文件的类型 （.doc  .txt）

Data:以二进制的存储的数据

2.添加文件上传控件和上传按钮

<asp:FileUpload ID="FileUpload1" runat="server" />

    <asp:Button ID="btnUpload" runat="server" Text="Upload" OnClick="btnUpload_Click" /><br />

    <asp:Label ID="lblMessage" runat="server" Text="" Font-Names = "Arial"></asp:Label>

3.添加上传文件事件

protected void btnUpload_Click(object sender, EventArgs e)

        {

            //获取上传的文件

            string filePath = FileUpload1.PostedFile.FileName;

            //获取上传文件名

            string filename = Path.GetFileName(filePath);

            //获取文件按的后缀名

            string ext = Path.GetExtension(filename);  

            string contenttype = String.Empty;



            //根据后缀名设置文件类型

            switch (ext)

            {

                case ".doc":

                    contenttype = "application/vnd.ms-word";

                    break;

                case ".docx":

                    contenttype = "application/vnd.ms-word";

                    break;

                case ".xls":

                    contenttype = "application/vnd.ms-excel";

                    break;

                case ".xlsx":

                    contenttype = "application/vnd.ms-excel";

                    break;

                case ".jpg":

                    contenttype = "image/jpg";

                    break;

                case ".png":

                    contenttype = "image/png";

                    break;

                case ".gif":

                    contenttype = "image/gif";

                    break;

                case ".pdf":

                    contenttype = "application/pdf";

                    break;

            }



            if (contenttype != String.Empty)

            {

                Stream fs = FileUpload1.PostedFile.InputStream;

                BinaryReader br = new BinaryReader(fs);

                Byte[] bytes = br.ReadBytes((Int32)fs.Length);

                //insert the file into database



                string strQuery = "insert into FileSaves(Name, ContentType, Data)" +"values (@Name, @ContentType, @Data)";

                SqlCommand cmd = new SqlCommand(strQuery);

                cmd.Parameters.Add("@Name", SqlDbType.VarChar).Value = filename;

                cmd.Parameters.Add("@ContentType", SqlDbType.VarChar).Value

                  = contenttype;

                cmd.Parameters.Add("@Data", SqlDbType.Binary).Value = bytes;

                InsertUpdateData(cmd);

                lblMessage.ForeColor = System.Drawing.Color.Green;

                lblMessage.Text = "File Uploaded Successfully";

            }

            else

            {

                lblMessage.ForeColor = System.Drawing.Color.Red;

                lblMessage.Text = "File format not recognised." +" Upload Image/Word/PDF/Excel formats";

            }

        }

View Code

4.根据查询字符串判断文件是否上传成功

  private Boolean InsertUpdateData(SqlCommand cmd)

        {

            String strConnString = System.Configuration.ConfigurationManager.ConnectionStrings["DemosDatabaseConnectionString"].ConnectionString;

            SqlConnection con = new SqlConnection(strConnString);

            cmd.CommandType = CommandType.Text;

            cmd.Connection = con;

            try

            {

                con.Open();

                cmd.ExecuteNonQuery();

                return true;

            }

            catch (Exception ex)

            {

                Response.Write(ex.Message);

                return false;

            }

            finally

            {

                con.Close();

                con.Dispose();

            }

        }

View Code