cakephp2.X多表联合查询join及使用分页查询的方法

public function getconditions($data){  $this->loadModel("Cm.LoginHistory");  $conditions = array();  foreach ($data as $key=>$val){    if($key=='start_date'){      $conditions['LoginHistory.logintime >=']=trim($val);    }elseif ($key=='end_date'){      $conditions['LoginHistory.logouttime <=']=trim($val);    }elseif ($key=='selectvsoftid' and $val !=''){      $conditions['LoginHistory.LOGINSUBSYSTEM LIKE']='%'.trim($val).'%';    }elseif ($key=='username' and $val !=''){      $conditions['LoginHistory.USERNAME LIKE']='%'.trim($val).'%';    }elseif ($key=='vdevicename' and $val !=''){      $conditions['LoginHistory.WINDOWNAME LIKE']='%'.trim($val).'%';    }elseif ($key=='selectvsoftid' and $val !=''){      $conditions['LoginHistory.PHDEVICENAME LIKE']='%'.trim($val).'%';    }  }  return $conditions;}

$fields = array('LoginHistory.windowname','LoginHistory.loginsubsystem','VirtualDevice.PHDEVICEID','LoginHistory.userid', 'VirtualDevice.SYSTYPEID','UserInfo.USERNAME','"SUM"(LoginHistory.LOGOUTTIME-LoginHistory.LOGINTIME) moument','UserInfo.USERNAME','DeviceInfo.DEVICENAME');$group=array('LoginHistory.windowname', 'LoginHistory.loginsubsystem', 'LoginHistory.userid','UserInfo.USERNAME','DeviceInfo.DEVICENAME','VirtualDevice.SYSTYPEID','VirtualDevice.PHDEVICEID');$this->paginate = array('conditions'=>$conditions,'fields'=>$fields,'group'=>$group,'limit'=>9,'joins' => array(   array(     'alias' => 'UserInfo',     'table' => 'SMM_USERINFO',     'type' => 'LEFT',     'conditions' => ' LoginHistory.USERID=UserInfo.USERID ',   ),   array(     'alias' => 'VirtualDevice',     'table' => 'ET_NMVIRTUALDEVICEINFO',     'type' => 'LEFT',     'conditions' => ' LoginHistory.WINDOWNAME=VirtualDevice.DEVICENAME ',   ),   array(     'alias' => 'DeviceInfo',     'table' => 'ET_NMDEVICEINFO',     'type' => 'LEFT',     'conditions' => ' VirtualDevice.PHDEVICEID=DeviceInfo.DEVICEID ',   ), ));$LoginHistory = $this->paginate('LoginHistory');$this->set('loginhistory',$LoginHistory);