Source code for airflow.providers.oracle.transfers.oracle_to_oracle
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from __future__ import annotations
from typing import TYPE_CHECKING, Sequence
from airflow.models import BaseOperator
from airflow.providers.oracle.hooks.oracle import OracleHook
if TYPE_CHECKING:
from airflow.utils.context import Context
[docs]class OracleToOracleOperator(BaseOperator):
"""
Moves data from Oracle to Oracle.
:param oracle_destination_conn_id: destination Oracle connection.
:param destination_table: destination table to insert rows.
:param oracle_source_conn_id: :ref:`Source Oracle connection <howto/connection:oracle>`.
:param source_sql: SQL query to execute against the source Oracle
database. (templated)
:param source_sql_params: Parameters to use in sql query. (templated)
:param rows_chunk: number of rows per chunk to commit.
"""
[docs] template_fields: Sequence[str] = ("source_sql", "source_sql_params")
[docs] template_fields_renderers = {"source_sql": "sql", "source_sql_params": "py"}
def __init__(
self,
*,
oracle_destination_conn_id: str,
destination_table: str,
oracle_source_conn_id: str,
source_sql: str,
source_sql_params: dict | None = None,
rows_chunk: int = 5000,
**kwargs,
) -> None:
super().__init__(**kwargs)
if source_sql_params is None:
source_sql_params = {}
self.oracle_destination_conn_id = oracle_destination_conn_id
self.destination_table = destination_table
self.oracle_source_conn_id = oracle_source_conn_id
self.source_sql = source_sql
self.source_sql_params = source_sql_params
self.rows_chunk = rows_chunk
def _execute(self, src_hook, dest_hook, context) -> None:
with src_hook.get_conn() as src_conn:
cursor = src_conn.cursor()
self.log.info("Querying data from source: %s", self.oracle_source_conn_id)
cursor.execute(self.source_sql, self.source_sql_params)
target_fields = [field[0] for field in cursor.description]
rows_total = 0
for rows in iter(lambda: cursor.fetchmany(self.rows_chunk), []):
dest_hook.bulk_insert_rows(
self.destination_table, rows, target_fields=target_fields, commit_every=self.rows_chunk
)
rows_total += len(rows)
self.log.info("Total inserted: %s rows", rows_total)
self.log.info("Finished data transfer.")
cursor.close()
[docs] def execute(self, context: Context) -> None:
src_hook = OracleHook(oracle_conn_id=self.oracle_source_conn_id)
dest_hook = OracleHook(oracle_conn_id=self.oracle_destination_conn_id)
self._execute(src_hook, dest_hook, context)