I have Stored my resume(word document) in my database.and i just want to show that resume in txt format to user. how can i show it to user?
I'm not that good in ASP.NET, but check the links below. Maybe it's not a solution, you want, but can be useful.
Save-Read-Image-Database
There isn't that much of difference, depending on what type to you use for your resume, a varchar or maybe varbinary.
How to Create a text file in ASP .NET
Reading and Writing Text Files with the .NET Framework
Tutorials on how to read/write a file in asp.net.
Good Luck!
UPDATE:
So if it's a varbinary type, you can read as it was shown in first link. I'll paste a part with some changes.
connection.Open();
SqlCommand command1 = new SqlCommand("select <resume_content> from <resume_table> where id = #id", connection);
SqlParameter myparam = command1.Parameters.Add("#id", SqlDbType.Int);
myparam.Value = <your_value>
byte[] resume = (byte[])command1.ExecuteScalar();
MemoryStream str = new MemoryStream();
str.Write(resume, 0, resume.Length);
After that, just save the Stream to a file. Here's the link
Save a Stream to a File
UPDATE 2:
It's because you SELECT two columns. It takes FileName as the value for byte[]. For two columns you'd need to use ExecuteReader instead of ExecuteScalar.
Check this link
http://www.developerfusion.com/article/4278/using-adonet-with-sql-server/2/
Probably best to direct the user to download the document directly, and they can open it themselves.
Related
Long time lurker first time poster. Working with .Net / Linq for just a few years so I'm sure I'm missing something here. After countless hours of research I need help.
I based my code on a suggestion from https:http://damieng.com/blog/2010/01/11/linq-to-sql-tips-and-tricks-3
The following code currently saves a chosen file (pdf, doc, png, etc) which is stored in an sql database to the C:\temp. Works great. I want to take it one step further. Instead of saving it automatically to the c:\temp can I have the browser prompt so they can save it to their desired location.
{
var getFile = new myDataClass();
//retrieve attachment id from selected row
int attachmentId = Convert.ToInt32((this.gvAttachments.SelectedRow.Cells[1].Text));
//retrieve attachment information from dataclass (sql attachment table)
var results = from file in getFile.AttachmentsContents
where file.Attachment_Id == attachmentId
select file;
string writePath = #"c:\temp";
var myFile = results.First();
File.WriteAllBytes(Path.Combine(writePath, myFile.attach_Name), myFile.attach_Data.ToArray());
}
So instead of using File.WriteAllBytes can I instead take the data returned from my linq Query (myFile) and pass it into something that would prompt for the user to save the file instead?). Can this returned object be used with response.transmitfile? Thanks so much.
Just use the BinaryWrite(myFile.attach_Data.ToArray()) method to send the data since it is already in memory.
But first set headers appropriately, for example:
"Content-Disposition", "attachment; filename="+myFile.attach_Name
"Content-Type", "application/vnd.openxmlformats-officedocument.wordprocessingml.document"
Content-type guides the receiving system on how it should handle the file. Here are more MS Office content types. If they are known at the point the data is stored, the content-type should be stored, too.
Also, since the file content is the only data you want in the response, call Clear before and End after BinaryWrite.
There are around 1k records in my database which have a demographic info + an image column. All the images currently reside in a filesystem and I have been assigned with the task of picking up those images and storing it in the database.
My objective is
1. Using ASP.NET, read an image file from a filesystem
2. Store the image in SQL Server 2008 database
By far I have seen this possible only using FileUpload methods which will be very tedious.
Any help, greatly appreciated
Thanks,
neil
This is a pretty good how-to, and it includes VB and C# code: http://www.aspsnippets.com/Articles/Save-and-Retrieve-Files-from-SQL-Server-Database-using-ASP.Net.aspx
If you need to do bulk loading, just toss a loop around the code and feed it the list of files in the directories.
Asp.net is not suited for a bulk loading tasks.
Since the files are already on your file system, a simple console app could do the task.
Get all the files in your image directory
Loop over them to read the bytes
Insert the data to your db.
Code:
var files = Directory.GetFiles(#"MY_PATH");
foreach (var file in files)
{
var data = File.ReadAllBytes(file);
var fileName = Path.GetFileName(file);
string strQuery = "insert into imageData(Name, Data) values (#Name,#Data)";
SqlCommand cmd = new SqlCommand(strQuery);
cmd.Parameters.Add("#Name", SqlDbType.VarChar).Value = filename;
cmd.Parameters.Add("#Data", SqlDbType.Binary).Value = data;
cmd.ExecuteNonQuery();
}
We are storing scheduled email information in SQL Server 2005. Included in the email information are 0 - 3 attachments of varying filetype. I have a VB.net Windows service that runs 'x' number of minutes, populates a dataset with the email info from SQL Server, builds the emails, and sends them via ASPNet EMail.
Trying to build and add an attachment from a BLOB causes the email send method to time out, even if the attachment is just a 15 byte text file. Hardcoding the path directly to the file works fine. I've tried several methods and can't get it right.
Hmm, I've done a similar thing. For each of my attachments I store the data as a binary column, and a separate column containing the size of the file in bytes. To obtained from the database I wrote something like (usingSqlCommand and SqlDataReader classes):
attachment = new byte[size];
sqlReader.GetBytes(sqlReader.GetOrdinal("attachment"), 0, attachment, 0, size);
System.IO.MemoryStream s = new System.IO.MemoryStream(attachment, true);
s.Write(attachment, 0, attachment.Length);
And too attached to a MailMessage class (mm for short);
System.IO.MemoryStream s = new System.IO.MemoryStream(attachment, false);
Attachment attached = new Attachment(s, "some file name");
mm.Attachments.Add(attached);
Maybe these extracts will help! I've pulled the code from two different custom classes, so it's a little clunky with the MemoryStream object in each extract.
I'm currently patching an asp.net program where I need to be able to send an image to an SQL Server 2005 DB. It works fine when I use the asp:fileupload control, but the trick is that when the user deletes the image, I'm supposed to replace it with an image from the server saying "empty", in code-behind.
I know how to open, use and save text files in vb, but I can't find any information anywhere on how to open an image / binary file in a similar manner so that I can use it as an sql-parameter on the update query.
Below is an example of how easy it is to use a file from the fileupload control.
Dim t_id As Integer = Convert.ToInt32(Request.QueryString("id"))
open()
Dim picture As New SqlParameter("#picture", pictureFileUpload.FileBytes)
Dim id As New SqlParameter("#id", t_id)
myCommand = New SqlCommand("spChangeImage")
myCommand.CommandType = CommandType.StoredProcedure
myCommand.Connection = conn
myCommand.Parameters.Add(picture)
myCommand.Parameters.Add(id)
myCommand.ExecuteNonQuery()
close()
Now I need a way to open an image file and set it as a parameter in a similar manner, but I've no clue as to how to go about doing that. All the search results are focused on opening and viewing an image in html, I just need the binary to use it in the query. I'm trying to use binaryreader but even then I've no idea how to actually map the file to begin with.
Thanks in advance for any help!
Personally, I wouldn't store this image in the database when the user deletes their value. I would set the column to null. When writing the image I would detect if the column is null, then read the file and write it to the response. If you do this, then you won't need to accumulate anything into a local buffer, you can just write each buffer to the response as it is read. You can use FileInfo.Length to determine the content length of the response.
If you insist on putting the image in the DB, you can also use FileInfo.Length to determine the size of buffer you need to hold the image. Use your BinaryReader to read this length of bytes into the buffer. The buffer then becomes your parameter to the SQL command.
this might help.
I have a sql server database that returns byte for the image. If I use the tableadapter wizard and set it to my stored procedure and preview data, it pulls back an image. It automatically turns it into an image in the preview data. I don't see it as a string of Ints or anything.
How can I display it on my asp.net webpage with a gridview and objectdatasource?
I have searched and foudn where the imagefield can point to a url on another page that does the byte transformation but I'm not sure it's the best. I found another way that creates a temp file.
Just trying to see the best way to do it.
edit - I am trying not to use a temp file. If I cannot use a gridview a regular image field is ok.
asp.net 2.0, c#.
Thank you for any help.
edit
ended up with:
protected void Page_Load(object sender, EventArgs e)
{
string id = Request["id"];
string connstr = "DSN=myserver";
OdbcConnection conn = new OdbcConnection(connstr);
OdbcCommand cmd = new OdbcCommand("{call mySP (?)}", conn);
cmd.CommandType = CommandType.StoredProcedure;
// Add the input parameter and set its properties.
OdbcParameter parameter = new OdbcParameter();
parameter.ParameterName = "#MyParam";
parameter.OdbcType = OdbcType.VarChar;
parameter.Direction = ParameterDirection.Input;
parameter.Value = id;
// Add the parameter to the Parameters collection.
cmd.Parameters.Add(parameter);
conn.Open();
OdbcDataReader dr = cmd.ExecuteReader();
while (dr.Read())
{
byte[] buffer = (byte[])dr[0];
Response.ContentType = "image/jpg";
Response.BinaryWrite(buffer);
Response.Flush();
}
}
and this on the calling page:
<asp:Image ID="Image1" ImageAlign="Middle" ImageUrl="show.aspx?id=123" Runat="server" />
Two options:
Create a temp file - The problem with this approach is that you have to create the file, which means your web must have write access to a directory which is not a great thing. You also need to have a way to clean up the images.
Serve it from another URL - This is my preferred method, as you have no disk access required. A simple http handler (ashx) is a great method to serve up the image.
Edit
If you need session state in the ashx, check out: Asp.net System.Web.HttpContext.Current.Session null in global.asax.
Edit
Couple more thoughts. There are some cases where using a temp file might be better. For example if your images are requested frequently by a lot of users. Then storing the images on the disk would make sense, since you could write the file once, this does increase the maintance complexity but depending on traffic it might be worth it since this would let you avoid calling back into the .net stack and leverage IIS caching of static content.
I wrote the SqlReader plugin for open-source ImageResizing.Net library to allow you to serve and display images from a SQL database in the most performance-optimal way.
Even if you don't need to do any image processing whatsoever, it's still (a) the easiest, and (b) the most efficient way to do it. You can combine it with disk caching (which provides automatic cleanup) to get the best performance that is possible.
Installation is easy - 2 nuget commands, or copy & paste into Web.Config, your pick.
If you need help, support is free and fast.
The sample code you added is good but you should move it to a .ashx file which is meant for such things.
Here is some example code on how to do this.