code: function updateCounter($column, $number = 1) {
          return $this->update(array($column => $this->createLiteral($column, $number)));
      }
docs: 更新单个计数器，更友好的+1或-1或更新计数器的操作
  
  @param string $column
  @param int/float $number
  
  @ return int number of affected rows or false in case of an error