:py:mod:`airflow.providers.google.cloud.transfers.sql_to_gcs`
=============================================================

.. py:module:: airflow.providers.google.cloud.transfers.sql_to_gcs

.. autoapi-nested-parse::

   Base operator for SQL to GCS operators.


Module Contents
---------------

Classes
~~~~~~~

.. autoapisummary::

   airflow.providers.google.cloud.transfers.sql_to_gcs.BaseSQLToGCSOperator


.. py:class:: BaseSQLToGCSOperator(*, sql, bucket, filename, schema_filename = None, approx_max_file_size_bytes = 1900000000, export_format = 'json', field_delimiter = ',', null_marker = None, gzip = False, schema = None, parameters = None, gcp_conn_id = 'google_cloud_default', delegate_to = None, impersonation_chain = None, **kwargs)

   Bases: :py:obj:`airflow.models.BaseOperator`

   Copy data from SQL to Google Cloud Storage in JSON or CSV format.

   :param sql: The SQL to execute.
   :param bucket: The bucket to upload to.
   :param filename: The filename to use as the object name when uploading
       to Google Cloud Storage. A ``{}`` should be specified in the filename
       to allow the operator to inject file numbers in cases where the
       file is split due to size.
   :param schema_filename: If set, the filename to use as the object name
       when uploading a .json file containing the BigQuery schema fields
       for the table that was dumped from the database.
   :param approx_max_file_size_bytes: This operator supports the ability
       to split large table dumps into multiple files (see notes in the
       filename param docs above). This param allows developers to specify the
       file size of the splits. Check https://cloud.google.com/storage/quotas
       to see the maximum allowed file size for a single object.
   :param export_format: Desired format of files to be exported.
   :param field_delimiter: The delimiter to be used for CSV files.
   :param null_marker: The null marker to be used for CSV files.
   :param gzip: Option to compress file for upload (does not apply to schemas).
   :param schema: The schema to use, if any. Should be a list of dict or
       a str. Pass a string if using Jinja template, otherwise, pass a list of
       dict. Examples could be seen: https://cloud.google.com/bigquery/docs
       /schemas#specifying_a_json_schema_file
   :param gcp_conn_id: (Optional) The connection ID used to connect to Google Cloud.
   :param delegate_to: The account to impersonate using domain-wide delegation of authority,
       if any. For this to work, the service account making the request must have
       domain-wide delegation enabled.
   :param parameters: a parameters dict that is substituted at query runtime.
   :param impersonation_chain: Optional service account to impersonate using short-term
       credentials, or chained list of accounts required to get the access_token
       of the last account in the list, which will be impersonated in the request.
       If set as a string, the account must grant the originating account
       the Service Account Token Creator IAM role.
       If set as a sequence, the identities from the list must grant
       Service Account Token Creator IAM role to the directly preceding identity, with first
       account from the list granting this role to the originating account (templated).

   .. py:attribute:: template_fields
      :annotation: :Sequence[str] = ['sql', 'bucket', 'filename', 'schema_filename', 'schema', 'parameters', 'impersonation_chain']

      
   .. py:attribute:: template_ext
      :annotation: :Sequence[str] = ['.sql']

      
   .. py:attribute:: template_fields_renderers
      

   .. py:attribute:: ui_color
      :annotation: = #a0e08c

      
   .. py:method:: execute(self, context)

      This is the main method to derive when creating an operator.
      Context is the same dictionary used as when rendering jinja templates.

      Refer to get_template_context for more context.


   .. py:method:: convert_types(self, schema, col_type_dict, row, stringify_dict=False)

      Convert values from DBAPI to output-friendly formats.


   .. py:method:: query(self)
      :abstractmethod:

      Execute DBAPI query.


   .. py:method:: field_to_bigquery(self, field)
      :abstractmethod:

      Convert a DBAPI field to BigQuery schema format.


   .. py:method:: convert_type(self, value, schema_type, **kwargs)
      :abstractmethod:

      Convert a value from DBAPI to output-friendly formats.