delete CDU

function DeletePDU(){
   global $person;
   $this->MakeSafe();

   // Do not attempt anything else if the lookup fails
   if(!$this->GetPDU()){return false;}

   // Check rights
   $cab=new Cabinet();
   $cab->CabinetID=$this->CabinetID;
   $cab->GetCabinet();

   //person 不具有写权限  ，无法删除设备
   if(!$person->canWrite($cab->AssignedTo)){return false;}

   // First, remove any connections to the PDU
   $tmpConn=new PowerConnection();
   $tmpConn->PDUID=$this->PDUID;
   $connList=$tmpConn->GetConnectionsByPDU();

   foreach($connList as $delConn){
      $delConn->RemoveConnection();
   }

   // Clear out any records from PDUStats, possible S.U.T. involving changing
   // a devicetype but leaving behind a phantom reading for a non-power device
   $sql="DELETE FROM fac_PDUStats WHERE PDUID=$this->PDUID;";
   $this->exec($sql);

   $sql="DELETE FROM fac_PowerDistribution WHERE PDUID=$this->PDUID;";
   if(!$this->exec($sql)){
      // Something went south and this didn't delete.
      return false;
   }else{
      (class_exists('LogActions'))?LogActions::LogThis($this):'';
      return true;
   }
}