Zend_Db - Building a Delete Query - zend-framework

Question

I'm trying to recreate the following in Zend Framework and am not sure how to do it:
DELETE FROM mytablename WHERE date( `time_cre` ) < curdate( ) - INTERVAL 4 DAY
I was thinking something like:
$table = $this->getTable();
$db = Zend_Registry::get('dbAdapter');
$db->delete($table, array(
'date(`time_cre`) < curdate() - interval 4'
));
Does that seem correct?
What is the best way to handle something like this?
EDIT: Ack! Sorry, I was adapting this from a SELECT I was using to test and didn't change the syntax properly when I pasted it in. I've edited the example to fix it.

Answer 1

Figured it out...
public function pruneOld($days) {
$table = $this->getTable();
$db = Zend_Registry::get('dbAdapter');
$where = $db->quoteInto("DATE(`time_cre`) < CURDATE() - INTERVAL ? DAY", $days);
return $table->delete($where);
}
$table gets an reference of the table I want to edit...
$db grabs an instance of the database adapter so I can use quoteInto()...
$where builds the main part of the query accepting $days to make things a bit more flexible.
Create an action to call this method... something like:
public function pruneoldAction() {
// Disable the view/layout stuff as I don't need it for this action
$this->_helper->layout()->disableLayout();
$this->_helper->viewRenderer->setNoRender(true);
// Get the data model with a convenience method
$data = $this->_getDataModel();
// Prune the old entries, passing in the number of days I want to be older than
$data->pruneOld(2);
}
And now hitting: http://myhost/thiscontroller/pruneold/ will delete the entries. Of course, anyone hitting that url will delete the entries but I've taken steps not included in my example to deal with this. Hope this helps someone.

Answer 2

I usually do this to delete a row
$table = new yourDB;
$row = $table->fetchRow($table->select()->where(some where params));
$row->delete();

Answer 3

try:
$db->delete($table, array(
'date(time_cre) < ?' => new Zend_Db_Expr('curdate() - interval 4')
));