6CC001 Workshop - week 04

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Your job today is to implement a blog similar to this one:

• http://mi-linux.wlv.ac.uk/~in9352/OO/blog/index.php

The different steps are:

1. Step 1 - Create and populate database
2. Step 2 - Create the index.php file, front controller and registry class
3. Step 3 - Handling user request and creating appropriate command
4. Step 4 - Accessing the database
5. Step 5 - Creating our first view
6. Step 6 - Adding messages
7. Step 7 - Deleting messages

Let's take it one step at a time... and remember: read and understand the code before pasting it into your text editor!

Step 7 - Deleting messages

Finally, let’s create a new action in charge of message deletion.

Again if you browse the mouse over the “delete this message” links, you will see URLs such as “index.php?cmd=BlogDelete&id=19”

So we need a new Command_BlogDelete class. Here is the code:

// Command_BlogDelete.php

//############################################################################
// SearchVenueCommand class
//############################################################################
class Command_BlogDelete extends Command
{
  //############################################################################
  // doExecute
  //############################################################################ 
  function doExecute(Request $request)
  {
    // Get data from request
    $id = $request->getProperty('id');
    
    // Create manager object
    $manager = new ManagerMessage();    
    
    // Add to database
    $manager->deleteMessage($id);
    
    // Redirect to index
    header("location:index.php");
  }
}

Nothing too complicated here...

Checkpoint

You should now be able to delete messages.

Note: It is always better practice to ask users to confirm deletion first... but you can do that bit ;)