docs: def load_table(self, table, rows, colnames=None, limit=None):
          """Load 'rows' into table 'table'. If 'colnames' is not provided, the
          first element of 'rows' must provide column names.
  
          """
  
          conn = self.engine.raw_connection()
          cur = conn.cursor()
  
          colnames = colnames or next(rows)
  
          cmd = 'INSERT INTO {table} ({colnames}) VALUES ({placeholders})'.format(
              table=self.tables[table],
              colnames=', '.join(colnames),
              placeholders=', '.join([self.placeholder] * len(colnames)))
  
          cur.executemany(cmd, itertools.islice(rows, limit))
          conn.commit()