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from airflow.hooks.oracle_hook import OracleHook
from airflow.models import BaseOperator
from airflow.utils.decorators import apply_defaults
[docs]class OracleToOracleTransfer(BaseOperator):
"""
Moves data from Oracle to Oracle.
:param oracle_destination_conn_id: destination Oracle connection.
:type oracle_destination_conn_id: str
:param destination_table: destination table to insert rows.
:type destination_table: str
:param oracle_source_conn_id: source Oracle connection.
:type oracle_source_conn_id: str
:param source_sql: SQL query to execute against the source Oracle
database. (templated)
:type source_sql: str
:param source_sql_params: Parameters to use in sql query. (templated)
:type source_sql_params: dict
:param rows_chunk: number of rows per chunk to commit.
:type rows_chunk: int
"""
[docs] template_fields = ('source_sql', 'source_sql_params')
@apply_defaults
def __init__(
self,
oracle_destination_conn_id,
destination_table,
oracle_source_conn_id,
source_sql,
source_sql_params=None,
rows_chunk=5000,
*args, **kwargs):
super(OracleToOracleTransfer, self).__init__(*args, **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
[docs] def _execute(self, src_hook, dest_hook, context):
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 = list(map(lambda field: field[0], cursor.description))
rows_total = 0
rows = cursor.fetchmany(self.rows_chunk)
while len(rows) > 0:
rows_total = rows_total + len(rows)
dest_hook.bulk_insert_rows(self.destination_table, rows,
target_fields=target_fields,
commit_every=self.rows_chunk)
rows = cursor.fetchmany(self.rows_chunk)
self.log.info("Total inserted: %s rows", rows_total)
self.log.info("Finished data transfer.")
cursor.close()
[docs] def execute(self, context):
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)