Skip to main content

Store uploaded file content in image field of SQL Server database and retrieve content back into its original file format


There is one requirement of storing file content in a database using Image data type. Image field can store up to 231-1 bytes and that equals around 2 GB. So you can store up to 2 GB data in image field of Microsoft SQL Server. Let us come to the point now; I was required to store uploaded file content in image field of database. File is uploaded through file upload control of HTML of course! While uploading the content you need to convert that content into byte array and then you can store it into the database. Now, how to convert file content into byte that I have displayed below with code.

Code: C#

Int32 intDocLength = File1.PostedFile.ContentLength;

byte[] bytDocTemp = new byte[intDocLength];

Stream objStream;

objStream = File1.PostedFile.InputStream;

objStream.Read(bytDocTemp, 0, intDocLength);


Now you can use bytDocTemp variable to store content of the file in the form of byte array into the database. Here, File1 is a file upload control and I used content length of the file to create an array of byte with exact size of the file.

I will show you how to retrieve file content from Image data type and showing it in its original form. You can display uploaded content of the file back to its original form with the following code:

Code: C#

Response.Clear();

Response.AddHeader(“Content-Disposition”, “attachment; filename=<filename>” + <File Extention>);

Response.ContentType = “application/octet-stream”;

Response.BinaryWrite(<byte array of the file>);

Response.End();


Here, replace <filename> with any of the file name that you need to display. File name must be without extension, and replace <File Extension> with your original file extension (like .doc, .pdf, .html etc). <byte array of the file> can be replaced with the content that you have fetched from the Image field of the database.

Whether you found this article useful or not? please provide your valuable comments.

Comments

Post a Comment

Popular posts from this blog

C# Generic class to parse value - "GenericConverter"

    public class GenericConverter     {         public static T Parse<T>(string sourceValue) where T : IConvertible         {             return (T)Convert.ChangeType(sourceValue, typeof(T));         }         public static T Parse<T>(string sourceValue, IFormatProvider provider) where T : IConvertible         {             return (T)Convert.ChangeType(sourceValue, typeof(T), provider);         }     }     public static class TConverter     {         public static T ChangeType<T>(object value)         {             return (T)ChangeType(typeof(T), value);         }         public static object ChangeType(Type t, object value)         {             TypeConverter tc = TypeDescriptor.GetConverter(t);             return tc.ConvertFrom(value);         }         public static void RegisterTypeConverter<T, TC>() where TC : TypeConverter         {             TypeDescriptor.AddAttributes(typeof(T), new TypeConverterAttribute(typeof(TC)));         }     } ----------------
Post a Comment
Read more

How to create a countdown timer in jquery

Create a countdown timer in jQuery First we need to include the jQuery library file to the HTML page to perform this task. To do that we need to understand that what exactly a jQuery library fie is ? JQuery library file is the library of JavaScript, which means this file contains the predefined functions of jQuery. We just need to call these functions to perform the task. jQuery functions reduces the lines of code and makes our task easy. As this jQuery library file contains the javascript functions so we need to call the function within <script> </script> tag. Now after including the file, we need to define a variable which will store that for how long you want the timer on the page(c=60) and now the time you set needs to be changed in hours , minutes and seconds using the code “ var hours = parseInt( time / 3600 ) % ;var minutes = parseInt( time / 60 ) % 60; var seconds = time % 60;” Now we need to put the condition if timer got finished (if (t
1 comment
Read more

Tip/Trick: Fix Common SEO Problems Using the URL Rewrite Extension

Search engine optimization (SEO) is important for any publically facing web-site.  A large % of traffic to sites now comes directly from search engines, and improving your site’s search relevancy will lead to more users visiting your site from search engine queries.  This can directly or indirectly increase the money you make through your site. This blog post covers how you can use the free Microsoft  URL Rewrite Extension  to fix a bunch of common SEO problems that your site might have.  It takes less than 15 minutes (and no code changes) to apply 4 simple  URL Rewrite  rules to your site, and in doing so cause search engines to drive more visitors and traffic to your site.  The techniques below work equally well with both ASP.NET Web Forms and ASP.NET MVC based sites.  They also works with all versions of ASP.NET (and even work with non-ASP.NET content). [In addition to blogging, I am also now using Twitter for quick updates and to share links. Follow me at:  twitter.com/scottg
Post a Comment
Read more