pytd.query_engine.PrestoQueryEngine

class pytd.query_engine.PrestoQueryEngine(apikey, endpoint, database, header)[source]

An interface to Treasure Data Presto query engine.

Parameters

apikey (str) – Treasure Data API key.
endpoint (str) – Treasure Data API server.
database (str) – Name of connected database.
header (str or bool) – Prepend comment strings, in the form “– comment”, as a header of queries.

Methods

`__init__`(apikey, endpoint, database, header)
`close`()	Close a connection to Presto.
`create_header`([extra_lines])	Build header comments.
`cursor`([force_tdclient])	Get cursor defined by DB-API.
`execute`(query, **kwargs)	Execute a given SQL statement and return results.

Attributes

`presto_api_host`	Presto API host obtained from `TD_PRESTO_API` env variable or inferred from Treasure Data REST API endpoint.
`user_agent`	User agent passed to a Presto connection.

property presto_api_host: Presto API host obtained from TD_PRESTO_API env variable or inferred from Treasure Data REST API endpoint.

cursor(force_tdclient=False, **kwargs)[source]

Get cursor defined by DB-API.

Parameters

force_tdclient (bool) – Specify whether the method always returns tdclient.cursor.Cursor. If False, returned cursor type is dynamically selected depending on **kwargs.
**kwargs –
Treasure Data-specific optional query parameters. Giving these keyword arguments forces query engine to issue a query via Treasure Data REST API provided by tdclient, rather than using a direct connection established by the prestodb package.
- db (str): use the database
- result_url (str): result output URL
- priority (int or str): priority
  - -2: “VERY LOW”
  - -1: “LOW”
  - 0: “NORMAL”
  - 1: “HIGH”
  - 2: “VERY HIGH”
- retry_limit (int): max number of automatic retries
- wait_interval (int): sleep interval until job finish
- wait_callback (function): called every interval against job itself

Return type

prestodb.dbapi.Cursor, or tdclient.cursor.Cursor