thinkphp 多表 事务详解

function makeAcquire($nUsers,$nAwards)
    {
     //更新数据库
     $tranDb = new Model();
     $tranDb->startTrans();
     for($i = 0; $i < sizeof($nUsers); $i++)
     {
      //更新表Acquire
      $flagAc = $tranDb->table('Acquire')->add($acquire);
      //更新表Users
      $where = array('u_id'=>$nUsers[$i]['u_id']);
      $flagU = $tranDb->table('Users')->where($where)->setInc('u_man_count',1);
      //更新表Award
      $where = array('a_id'=>$nAwards[$i]['a_id']);
      $flagA = $tranDb->table('Award')->where($where)->setDec('a_count',1);
     }
     if($flagAc && $flagU && $flagA)
     {
      $tranDb->commit();
     }
     else 
     {
      $tranDb->rollback();
     }
    }