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Get the Report →Use JayDeBeApi to access Greenplum Data in Python
Use standard Python scripting and the development environment of your choice to access live Greenplum data.
Access Greenplum data with Python scripts and standard SQL on any machine where Python and Java can be installed. You can use the CData JDBC Driver for Greenplum and the JayDeBeApi module to work with remote Greenplum data in Python. By using the CData Driver, you are leveraging a driver written for industry-proven standards to access your data in the popular Python language. This article shows how to use the driver to execute SQL queries to Greenplum and visualize Greenplum data with standard Python.
Use the JayDeBeApi module
JayDeBeApi is a Python library that serves as a JDBC (Java Database Connectivity) bridge, allowing Python programs to interact with Java databases, including CData JDBC Drivers. Use the pip install command to install the module:
pip install JayDeBeApi
Create the JDBC URL
Once you have JayDeBeApi installed, you are ready to work with Greenplum data in Python using SQL.
To connect to Greenplum, set the Server, Port (the default port is 5432), and Database connection properties and set the User and Password you wish to use to authenticate to the server. If the Database property is not specified, the default database for the authenticate user is used.
Built-in Connection String Designer
For assistance in constructing the JDBC URL, use the connection string designer built into the Greenplum JDBC Driver. Either double-click the JAR file or execute the jar file from the command-line.
java -jar cdata.jdbc.greenplum.jar
Fill in the connection properties and copy the connection string to the clipboard.
Below is a sample variable assignment, including a typical JDBC connection string:
jdbc_url = "jdbc:greenplum:User=user;Password=admin;Database=dbname;Server=127.0.0.1;Port=5432;"
Access Greenplum data in Python
With the JDBC URL configured, you only need the absolute path to the JDBC driver JAR file, which is in the "lib" folder in the installation directory ("C:\Program Files\CData[product_name] 20XX\lib\cdata.jdbc.greenplum.jar" on Windows).
NOTE: If you haven't already, set the JAVA_HOME environment variable to the Java installation directory.
Use code similar to the follow to read and print data from Greenplum:
import jaydebeapi
#The JDBC connection string
jdbc_url = "jdbc:greenplum:User=user;Password=admin;Database=dbname;Server=127.0.0.1;Port=5432;"
username = "****"
password = "****"
#The absolute Path to the JDBC driver JAR file, typically:
jdbc_driver_jar = "C:\Program Files\CData[product_name] 20XX\lib\cdata.jdbc.greenplum.jar"
conn = jaydebeapi.connect(
"cdata.jdbc.greenplum.GreenplumDriver",
jdbc_url,
[username, password],
jdbc_driver_jar,
)
cursor = conn.cursor()
cursor.execute("SELECT * FROM Orders;")
results = cursor.fetchall()
for row in results:
print(row)
cursor.close()
conn.close()
Free trial & more information
Download a free, 30-day trial of the CData JDBC Driver for Greenplum and start working with your live Greenplum data in Python. Reach out to our Support Team if you have any questions.