封装一下CakePHP的Model，增加链式操作

class AppModel extends Model {
public function save($data=null, $validate=true, $fieldList=array()) {
if (isset($this->data) && isset($this->data[$this->name])) {
unset($this->data[$this->name]['modified']);
}
if (isset($data) && isset($data[$this->name])) {
unset($data[$this->name]['modified']);
}
return parent::save($data, $validate, $fieldList);
}

protected $_params;
/*
* custom data query method goes here
*/
public function relation($params) { $this->_params['recursive'] = $params; return $this; }

public function where($params) { $this->_params['conditions'] = $params; return $this; }

public function order($params) { $this->_params['order'] = $params; return $this; }

public function fields($params) { $this->_params['fields'] = $params; return $this; }

public function page($params) { $this->_params['page'] = $params; return $this; }

public function limit($params) { $this->_params['limit'] = $params; return $this; }

public function offset($params) { $this->_params['offset'] = $params; return $this; }

public function joins($params) { $this->_params['joins'] = $params; return $this; }

public function group($params) { $this->_params['group'] = $params; return $this; }

public function count() {
$r = $this->find('count', $this->_params);
$this->_params = array();
return $r;
}

public function first() {
$r = $this->find('first', $this->_params);
$this->_params = array();
return $r;
}

public function select() {
$r = $this->find('all', $this->_params);
$this->_params = array();
return $r;
}

public function lists() {
$r = $this->find('list', $this->_params);
$this->_params = array();
return $r;
}

public function threaded() {
$r = $this->find('threaded', $this->_params);
$this->_params = array();
return $r;
}

public function neighbors() {
$r = $this->find('neighbors', $this->_params);
$this->_params = array();
return $r;
}

public function drop($cascade=false) {
if (!empty($this->_params['conditions'])) {
$r = $this->deleteAll($this->_params['conditions'], $cascade);
} else {
$r = array();
}
$this->_params = array();
return $r;
}
}