how can I check if form button is pressed?

hi everyone,

this seems really easy, but it's giving me a headache. I have a
function in my controller:

function createABC() {

// save stuff in database
}

this function is triggered by a form in a view, named createABC.ctp.
like this

echo $form->create('ABC', array('action' => 'createABC'));
echo $form->button('save', array('type' => 'submit'));
echo $form->end();

now, I do not want to start the saving procedure everytime the view is
called. so i wanna check if this button is hit first. if it is, then
save all the data. so i tried to check it like that:

function createABC() {

if (!empty ($this->data)) {
// save stuff in database
}
}

it does not work. anybody know why?

huuuge thx

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