Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <blockquote> <p>I can't retrieve it from database</p> </blockquote> <p>So your question is about retrieving an image from a database, right? It has strictly nothing to do with ASP.NET MVC?</p> <p>Unfortunately you haven't told us whether you are using some ORM framework to access to your database or using plain ADO.NET. Let's assume that you are using plain ADO.NET:</p> <pre><code>public byte[] GetImage(string id) { using (var conn = new SqlConnection("YOUR CONNECTION STRING COMES HERE")) using (var cmd = conn.CreateCommand()) { conn.Open(); // TODO: replace the imageData and id columns and tableName with your actual // database table names cmd.CommandText = "SELECT imageData FROM tableName WHERE id = @id"; cmd.Parameters.AddWithValue("@id", id); using (var reader = cmd.ExecuteReader()) { if (!reader.Read()) { // there was no corresponding record found in the database return null; } const int CHUNK_SIZE = 2 * 1024; byte[] buffer = new byte[CHUNK_SIZE]; long bytesRead; long fieldOffset = 0; using (var stream = new MemoryStream()) { while ((bytesRead = reader.GetBytes(reader.GetOrdinal("imageData"), fieldOffset, buffer, 0, buffer.Length)) &gt; 0) { stream.Write(buffer, 0, (int)bytesRead); fieldOffset += bytesRead; } return stream.ToArray(); } } } } </code></pre> <p>and if you are using some ORM it could be as simple as:</p> <pre><code>public byte[] GetImage(string id) { using (var db = new SomeDataContext()) { return db.Images.FirstOrDefault(x =&gt; x.Id == id).ImageData; } } </code></pre> <p>and then inside your controller action:</p> <pre><code>public ActionResult EnlargeShowcaseImage(string id) { var imageData = GetImage(id); if (imageData != null) { // TODO: adjust the MIME Type of the images return File(imageData, "image/png"); } return new HttpNotFoundResult(); } </code></pre> <p>and it is inside your view that you should create an <code>&lt;img&gt;</code> tag pointing to this controller action upon button click:</p> <pre><code>$('.enlargeImg').bind('click', function (e) { $('#imageContent').html( $('&lt;img/&gt;', { src: '/Home/EnlargeShowcaseImage/' + $(this).attr('id') }) ); $('#EnlargeContent').bPopup(); }); </code></pre> <p>But hardcoding the url to your controller action in javascript like this is very bad practice because when you deploy your application it might break. It might also break if you decide to change the pattern of your routes. You should never hardcode urls like this. I would recommend you generating this url on the server. </p> <p>For example I see that you have subscribed to some <code>.enlargeImage</code> element. Let's suppose that this is an anchor. Here's how to properly generate it:</p> <pre><code>@Html.ActionLink("Enlarge", "EnlargeShowcaseImage", "Home", new { id = item.Id }, new { @class = "enlargeImage" }) </code></pre> <p>and then adapt the click handler:</p> <pre><code>$('.enlargeImg').bind('click', function (e) { // Cancel the default action of the anchor e.preventDefault(); $('#imageContent').html( $('&lt;img/&gt;', { src: this.href }) ); $('#EnlargeContent').bPopup(); }); </code></pre>
    singulars
    1. This table or related slice is empty.
    1. POEnlarge Image On Click OF link in asp.net mvc3
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USDarin Dimitrov
    1. USDarin Dimitrov
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POEnlarge Image On Click OF link in asp.net mvc3
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTAcceptedByOriginator
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload