thinkphp5 model used in the lock operation

 1 public static function alter($aid, $rid)
 2     {
 3         $incDec = GoldRule::where(['gold_rule_isdel'=>1,'gold_rule_status'=>2])
 4             ->where('gold_rule_id', $rid)
 5             ->value('gold_rule_num');
 6         $isHas = self::where('gold_aid', $aid)->find();
 7 
 8         $model = new Gold();
 9         if ($isHas) {
10             try{
. 11                  $ Model -> startTrans (); // open transaction 
12 is                  $ Gold = $ Model -> Lock ( to true ) -> WHERE ( 'gold_aid', $ AID ) -> Find (); // lock 
13 is                  $ RES = Gold $ -> WHERE ( 'gold_aid', $ AID ) -> update ([ 'gold_number' => $ isHas [ 'gold_number'] + $ incDec ]); // perform an update
 14          　　　　　// SLEEP (. 5); // You can use sleep () function to verify lock plus successful second update will first wait for the update to complete 
15                  $ Model -> the commit (); // transaction commits 
16                  return  $ RES ;
 17             }catch(\Exception $exception){
18                 $model->rollback();
19                 throw $exception;
20             }
21         } else {
22 
23             $model->gold_aid = $aid;
24             $model->gold_number = $incDec;
25             return $model->save();
26         }
27     }