CData Python Connector for Google Spanner

Build 21.0.7930

Petl から

The 本製品 can be used to create ETL applications and pipelines for CSV data in Python using Petl.

Install Required Modules

Install the Petl modules using the pip utility.

pip install petl

Connecting

Import the modules, including the CData Python Connector for Google Spanner. You can then use the 本製品's connect function to create a connection using a valid Google Spanner connection string. A SQLAlchemy engine may also be used instead of a direct connection.

import petl as etl
import cdata.googlespanner as mod
cnxn = mod.connect("ProjectId='project1';InstanceId='instance1';Database='db1';OAuthClientId='757060765381';OauthClientSecret='abc';")

Extract, Transform, and Load the Google Spanner Data

Create a SQL query string and store the query results in a DataFrame.

sql = "SELECT	Name, TotalDue FROM [CData].[GoogleSpanner].Customer "
table1 = etl.fromdb(cnxn,sql)

Loading Data

With the query results stored in a DataFrame, you can load your data into any supported Petl destination. The following example loads the data into a CSV file.

etl.tocsv(table1,'output.csv')

Modifying Data

Insert new rows into Google Spanner tables using Petl's appenddb function.

table1 = [['Name','TotalDue'],['Jon Doe','John']]
etl.appenddb(table1,cnxn,'[CData].[GoogleSpanner].Customer')

Copyright (c) 2021 CData Software, Inc. - All rights reserved.
Build 21.0.7930