CREATE TABLE sqlite_master ( 
type TEXT, 
name TEXT, 
tbl_name TEXT, 
rootpage INTEGER, 
sql TEXT 
); 

SELECT * FROM sqlite_master WHERE type='table';

PRAGMA table_info(表名);
示例：
PRAGMA table_info(sqlite_sequence);

class DBOperate(object):
  """
  数据库操作类
  """
  def __init__(self, db_file_path):
    # 连接 sqlite db
    # 关于commit()，如果isolation_level隔离级别默认，那么每次对数据库的操作，都需要使用该命令，
    # 设置 isolation_level=None，变为自动提交模式
    self._db_file_path = db_file_path
    self.conn = sqlite3.connect(self._db_file_path, check_same_thread=False, isolation_level=None, timeout=1000)
    # 创建游标
    self.cur = self.conn.cursor()

  def queryall(self, sql):
    """
    查询所有的数据及对应的列名
    :param sql:
    :return:
    """
    self.cur.execute(sql)
    # TODO 获取查询结果的列名
    columns_tuple = self.cur.description
    # columns_tuple示例： (('TACHE_NAME', None, None, None, None, None, None), ('avgtime', None, None, None, None, None, None), ('DATE', None, None, None, None, None, None), ('ANALYSIS_TIME', None, None, None, None, None, None))
    columns_list = [field_tuple[0] for field_tuple in columns_tuple]
    # TODO 获取查询结果
    query_result = self.cur.fetchall()
    self.cur.close()
    return query_result, columns_list

  def close(self):
    """
    关闭数据库连接
    :return:
    """
    if self.cur is not None:
      self.cur.close()
    if self.conn is not None:
      self.conn.close()