Source code for airflow.operators.generic_transfer

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from typing import List, Optional, Union

from airflow.hooks.base import BaseHook
from airflow.models import BaseOperator

[docs]class GenericTransfer(BaseOperator): """ Moves data from a connection to another, assuming that they both provide the required methods in their respective hooks. The source hook needs to expose a `get_records` method, and the destination a `insert_rows` method. This is meant to be used on small-ish datasets that fit in memory. :param sql: SQL query to execute against the source database. (templated) :type sql: str :param destination_table: target table. (templated) :type destination_table: str :param source_conn_id: source connection :type source_conn_id: str :param destination_conn_id: source connection :type destination_conn_id: str :param preoperator: sql statement or list of statements to be executed prior to loading the data. (templated) :type preoperator: str or list[str] """
[docs] template_fields = ('sql', 'destination_table', 'preoperator')
[docs] template_ext = ( '.sql', '.hql',
[docs] template_fields_renderers = {"preoperator": "sql"}
[docs] ui_color = '#b0f07c'
def __init__( self, *, sql: str, destination_table: str, source_conn_id: str, destination_conn_id: str, preoperator: Optional[Union[str, List[str]]] = None, **kwargs, ) -> None: super().__init__(**kwargs) self.sql = sql self.destination_table = destination_table self.source_conn_id = source_conn_id self.destination_conn_id = destination_conn_id self.preoperator = preoperator
[docs] def execute(self, context): source_hook = BaseHook.get_hook(self.source_conn_id)"Extracting data from %s", self.source_conn_id)"Executing: \n %s", self.sql) results = source_hook.get_records(self.sql) destination_hook = BaseHook.get_hook(self.destination_conn_id) if self.preoperator:"Running preoperator")"Inserting rows into %s", self.destination_conn_id) destination_hook.insert_rows(table=self.destination_table, rows=results)

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