FHC-Core/application/models/ressource/Zeitsperre_model.php

<?php
class Zeitsperre_model extends DB_Model
{

	/**
	 * Constructor
	 */
	public function __construct()
	{
		parent::__construct();
		$this->dbTable = 'campus.tbl_zeitsperre';
		$this->pk = 'zeitsperre_id';
	}

    public function deleteEntriesForCurrentDay()
    {
        $today = date('Y-m-d');
        $qry = "DELETE FROM " . $this->dbTable . " 
                WHERE vondatum = '" . $today . "';";

        return $this->execQuery($qry);
    }
}