atoti_query.query_session module

class atoti_query.QuerySession

Used to query a remote Atoti session.

Note

The cube and table structure of a query session is expected to be immutable.

__init__(url, *, auth=None, certificate_authority=None, client_certificate=None, **kwargs)

Create a query session.

Parameters:

• url (str) – The base URL of the session. The endpoint f"{url}/versions/rest" is expected to exist.

• auth (Auth | None) – The authentication to use to access the session.

• certificate_authority (str | Path | None) – Path to the custom certificate authority file to use to verify the HTTPS connection. Required when the session has been configured with a certificate that is not signed by some trusted public certificate authority.

• client_certificate (ClientCertificate | None) – The client certificate to authenticate against the session.

property cubes: QueryCubes

Cubes of the session.

link(*, path='')

Display a link to this session.

If the atoti-jupyterlab3 plugin is:

• not enabled, the session’s local URL will be used so the link may not be reachable if Atoti is running on another machine. In that situation, the session may be reached from f{public_ip_or_domain_of_machine_hosting_atoti}:{session.port} (see atoti.Session.port()).

• enabled, the JupyterLab extension will try to access the session through (in this order):

  1. Jupyter Server Proxy if it is enabled.

  2. f"{session_protocol}//{jupyter_server_hostname}:{session.port}" for Session and session.url for QuerySession.

Parameters:

path (str) – The path to append to the session base URL. Defaults to the session home page.

Return type:

object

Example

Linking to an existing dashboard:

dashboard_id = "92i"
session.link(path=f"#/dashboard/{dashboard_id}")

query_mdx(mdx, *, keep_totals=False, timeout=datetime.timedelta(seconds=30), mode='pretty', context={}, **kwargs)

Execute an MDX query and return its result as a pandas DataFrame.

Parameters:

• mdx (str) –

  The MDX SELECT query to execute.

  Regardless of the axes on which levels and measures appear in the MDX, the returned DataFrame will have all levels on rows and measures on columns.

  Example

  >>> from datetime import date
  >>> df = pd.DataFrame(
  ...     columns=["Country", "Date", "Price"],
  ...     data=[
  ...         ("China", date(2020, 3, 3), 410.0),
  ...         ("France", date(2020, 1, 1), 480.0),
  ...         ("France", date(2020, 2, 2), 500.0),
  ...         ("France", date(2020, 3, 3), 400.0),
  ...         ("India", date(2020, 1, 1), 360.0),
  ...         ("India", date(2020, 2, 2), 400.0),
  ...         ("UK", date(2020, 2, 2), 960.0),
  ...     ],
  ... )
  >>> table = session.read_pandas(
  ...     df, keys=["Country", "Date"], table_name="Prices"
  ... )
  >>> cube = session.create_cube(table)
  

  This MDX:

  >>> mdx = (
  ...     "SELECT"
  ...     "  NON EMPTY Hierarchize("
  ...     "    DrilldownLevel("
  ...     "      [Prices].[Country].[ALL].[AllMember]"
  ...     "    )"
  ...     "  ) ON ROWS,"
  ...     "  NON EMPTY Crossjoin("
  ...     "    [Measures].[Price.SUM],"
  ...     "    Hierarchize("
  ...     "      DrilldownLevel("
  ...     "        [Prices].[Date].[ALL].[AllMember]"
  ...     "      )"
  ...     "    )"
  ...     "  ) ON COLUMNS"
  ...     "  FROM [Prices]"
  ... )
  

  Returns this DataFrame:

  >>> session.query_mdx(mdx, keep_totals=True)
                     Price.SUM
  Date       Country
  Total               3,510.00
  2020-01-01            840.00
  2020-02-02          1,860.00
  2020-03-03            810.00
             China      410.00
  2020-01-01 China
  2020-02-02 China
  2020-03-03 China      410.00
             France   1,380.00
  2020-01-01 France     480.00
  2020-02-02 France     500.00
  2020-03-03 France     400.00
             India      760.00
  2020-01-01 India      360.00
  2020-02-02 India      400.00
  2020-03-03 India
             UK         960.00
  2020-01-01 UK
  2020-02-02 UK         960.00
  2020-03-03 UK
  

  But, if it was displayed into a pivot table, would look like this:

  Country	Price.sum
  	Total	2020-01-01	2020-02-02	2020-03-03
  Total	3,510.00	840.00	1,860.00	810.00
  China	410.00			410.00
  France	1,380.00	480.00	500.00	400.00
  India	760.00	360.00	400.00
  UK	960.00		960.00

• keep_totals (bool) – Whether the resulting DataFrame should contain, if they are present in the query result, the grand total and subtotals. Totals can be useful but they make the DataFrame harder to work with since its index will have some empty values.

• timeout (timedelta) – The amount of time the query execution can take before aborting it.

• mode (Literal['pretty', 'raw']) –

  The query mode.

  • "pretty" is best for queries returning small results:

    • A QueryResult will be returned and its rows will be sorted according to the level order.

  • "raw" is best for benchmarks or large exports:

    • A faster and more efficient endpoint reducing the data transfer from Java to Python will be used.

    • A classic pandas.DataFrame will be returned.

    • include_totals="True" will not be allowed.

    • The Convert to Widget Below action provided by the atoti-jupyterlab3 plugin will not be available.

• context (Mapping[str, Any]) – Context values to use when executing the query.

Return type:

DataFrame

property url: str

URL of the session.

visualize(name=None)

Display an Atoti widget to explore the session interactively.

Note

This method requires the atoti-jupyterlab3 plugin.

The widget state will be stored in the cell metadata. This state should not have to be edited but, if desired, it can be found in JupyterLab by opening the “Notebook tools” sidebar and expanding the “Advanced Tools” section.

Parameters:

name (str | None) – The name to give to the widget.

Return type:

object