Zend_Db_Table_Abstract::_cascadeDelete PHP Method

    public function _cascadeDelete($parentTableClassname, array $primaryKey)
    {
        $this->_setupMetadata();
        $rowsAffected = 0;
        foreach ($this->_getReferenceMapNormalized() as $map) {
            if ($map[self::REF_TABLE_CLASS] == $parentTableClassname && isset($map[self::ON_DELETE])) {
                switch ($map[self::ON_DELETE]) {
                    case self::CASCADE:
                        $where = array();
                        for ($i = 0; $i < count($map[self::COLUMNS]); ++$i) {
                            $col = $this->_db->foldCase($map[self::COLUMNS][$i]);
                            $refCol = $this->_db->foldCase($map[self::REF_COLUMNS][$i]);
                            $type = $this->_metadata[$col]['DATA_TYPE'];
                            $where[] = $this->_db->quoteInto($this->_db->quoteIdentifier($col, true) . ' = ?', $primaryKey[$refCol], $type);
                        }
                        $rowsAffected += $this->delete($where);
                        break;
                    default:
                        // no action
                        break;
                }
            }
        }
        return $rowsAffected;
    }