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How to Save an Image in a SQL Server Database?
Many web applications have many images used in them. These images are usually stored in a folder on the web server and are available by providing the same path as the file in respect of the website directory. With .Net being the current distribution platform, ASP.Net can be used to store small images to be stored in databases such as SQL Server 2000 and later versions. For this reason the SQL Server database provides a data type called “image” which is used to store images in the database.
To access these images stored in the database we will be using ADO.Net classes. To learn how to insert and retrieve an image into a SQL Server database, you can create an .aspx page that contains an HTMLInputFile control that is used to select the image file that should be stored in the database. You can also create a control box where you can add an image name or comment or a saved image id. Use the edit button to upload the image to the database. Namespaces such as System.Data.SqlClient, System.Drawing, System.Data, System.IO, and System.Drawing.Imaging are used for this function.
In the OnClick property of the button you can write the following code to upload the image to the database.
// create bytes for the uploaded image file
int imagelen = Upload.PostedFile.ContentLength;
bath picbyte = new byte[imagelen];
Upload.PostedFile.InputStream.Read(picbyte, 0, imagelen);
// Load the image and image ID into the database
SqlConnection conn = new SqlConnection (@”provide a connection string
SqlCommand cmd = new SqlCommand(“insert into ImageTable”
+ “(ImageField, ImageID) values (@pic, @imageid)”,
You can rewrite the code above and call the function in the OnClick event of the upload button. The code given above does the following by inserting an image into the database.
1. Find the height of the image to be uploaded
2. Create a byte to save the image
3. Read the input of the uploaded file
4. Create a link object
5. Open the connection item
6. Create a command object
7. Add parameters to the command object
8. Execute the sql command using the ExecuteNonQuery method of the command object
9. Close the connection element
To retrieve the image from SQL Database you can do this.
1. Create a MemoryStream object. The code can be like, MemoryStream mstream = new MemoryStream();
2. Create a link object
3. Open the database connection
4. Create a command object to issue a command to retrieve the image
5. Use the ExecuteScalar method of the command object to retrieve the image
6. Cast the result of the ExecuteScalar method to a byte
bath image = (byte) rule.ExecuteScalar ();
7. Type mstream. Write(image, 0, image.Length);
8. Create a bitmap object to hold the stream Bitmap bitmap = new Bitmap(stream);
9. Set the content type to “image/gif” Response.ContentType = “image/gif”;
10. Use the Save method of the bitmap object to output the image to the OutputStream.
11. Close the connection
12. Close mstream. Close ();
Using the above methods you can access and display the image from the database to the website.
You can use these algorithms and take advantage of the “image” feature available in the SQLServer 2000 database to store small images that correspond to a particular record in the database table. This storage option avoids the tedious task of tracing the web folder path if the images are stored in a web folder.
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