使用C＃在客户端计算机和服务器计算机数据库之间进行文件传输

Question

I have this SQL database on a server machine in a network and I want any of the client machines to be able to upload and download files to and from the database accordingly where the files will be saved to the server machine file system and their meta data will be stored in the database.
What is the best method to perform that task? and how shall I implement it using C# winform application? thx in advance @_@

Answer 1

try
{
    if (txtFilePath.Text == pdfFilepath )
    {
        byte [] b=File .ReadAllBytes (pdfFilepath);
        SqlConnection con1=Connection.Conn();
        SqlCommand cmd=new SqlCommand ("insert into tbl_Document(Company_Id,FileNo,PdfFile)values(@cid,@fno,@file)",con1);
        cmd .Parameters .AddWithValue("@cid",txtCompanyId.Text);
        cmd .Parameters .AddWithValue("@fno",txtFileNumber.Text);
        cmd .Parameters .AddWithValue("@file",b);
        con1.Open();
        cmd .ExecuteNonQuery();
        con1.Close();
    }
    else
    {
        MessageBox.Show("Please give a valid file address.");
        this.Dispose();
    }
}
catch
{ 
    MessageBox.Show("Unable to Process.");
    this.Dispose();
}

Answer 2

Why do you want the files to be stored in a database? A file system (which I'm sure the server in question also has) is much more suited to keeping and serving files.

If the files must be in the database, then you'd probably just want to store them in a blob field. Additional fields should be added to the table with data about the files, of course. File name, file type, maybe file size if you don't want to have to calculate it from the blob on the fly, maybe the user who uploaded it, the time it was uploaded, etc.

At that point you'd interact with it just like any other database record in your application (skipping explanation of that for brevity, there's no shortage of tutorials on the subject), with the additional step of converting to and from byte arrays for the blob data. Also, no shortage of examples .

But I have to drive back to my original question. Why put files in a relational database?