Source code for airflow.contrib.operators.mssql_to_gcs

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MsSQL to GCS operator.

import decimal

from airflow.utils.decorators import apply_defaults
from airflow.hooks.mssql_hook import MsSqlHook
from airflow.contrib.operators.sql_to_gcs import BaseSQLToGoogleCloudStorageOperator

[docs]class MsSqlToGoogleCloudStorageOperator(BaseSQLToGoogleCloudStorageOperator): """Copy data from Microsoft SQL Server to Google Cloud Storage in JSON or CSV format. :param mssql_conn_id: Reference to a specific MSSQL hook. :type mssql_conn_id: str **Example**: The following operator will export data from the Customers table within the given MSSQL Database and then upload it to the 'mssql-export' GCS bucket (along with a schema file). :: export_customers = MsSqlToGoogleCloudStorageOperator( task_id='export_customers', sql='SELECT * FROM dbo.Customers;', bucket='mssql-export', filename='data/customers/export.json', schema_filename='schemas/export.json', mssql_conn_id='mssql_default', google_cloud_storage_conn_id='google_cloud_default', dag=dag ) """
[docs] ui_color = '#e0a98c'
[docs] type_map = { 3: 'INTEGER', 4: 'TIMESTAMP', 5: 'NUMERIC'
} @apply_defaults def __init__(self, mssql_conn_id='mssql_default', *args, **kwargs): super(MsSqlToGoogleCloudStorageOperator, self).__init__(*args, **kwargs) self.mssql_conn_id = mssql_conn_id
[docs] def query(self): """ Queries MSSQL and returns a cursor of results. :return: mssql cursor """ mssql = MsSqlHook(mssql_conn_id=self.mssql_conn_id) conn = mssql.get_conn() cursor = conn.cursor() cursor.execute(self.sql) return cursor
[docs] def field_to_bigquery(self, field): return { 'name': field[0].replace(" ", "_"), 'type': self.type_map.get(field[1], "STRING"), 'mode': "NULLABLE",
} @classmethod
[docs] def convert_type(cls, value, schema_type): """ Takes a value from MSSQL, and converts it to a value that's safe for JSON/Google Cloud Storage/BigQuery. """ if isinstance(value, decimal.Decimal): return float(value) return value

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