code: public function update_batch($data, $where_key)
      {
          $_data = array();
  
          foreach ($data as $key => $row) {
  
              if (false !== $row = $this->_do_pre_update($row)) {
                  $_data[$key] = $row;
              }
          }
  
          return $this->_database->update_batch($this->_table, $_data, $where_key);
      }
docs: Update all records
  @param $data
  @param $where_key
  @return