A basic Python demo CRUD application using the DataStax Python Driver for Apache Cassandra.
The intent is to help users get up and running quickly with the driver.
If you are having trouble, the complete code solution for quickstart.py
can be found here.
- A running instance of Apache Cassandra® 2.1+
- Python 2.7, 3.4, 3.5, or 3.6.
- Use Pip to install the driver:
pip install cassandra-driver
- We highly recommend to use a virtualenv
The users.cql
file provides the schema used for this project:
CREATE KEYSPACE demo
WITH replication = {'class': 'SimpleStrategy', 'replication_factor': '1'};
CREATE TABLE demo.users (
lastname text PRIMARY KEY,
age int,
city text,
email text,
firstname text);
All of our code is contained in the quickstart.py
file.
The create_connection()
function connects to our cluster.
By default, Cluster()
will try to connect to 127.0.0.1 (localhost). Replace with your own contact point(s) if necessary.
def create_connection():
# TO DO: Fill in your own contact point
cluster = Cluster(['127.0.0.1'])
return cluster.connect('demo')
Fill the code in the functions that will add a user, get a user, update a user and delete a user from the table with the driver.
def set_user(session, lastname, age, city, email, firstname):
# TO DO: execute SimpleStatement that inserts one user into the table
session.execute("INSERT INTO users (lastname, age, city, email, firstname) VALUES (%s,%s,%s,%s,%s)", [lastname, age, city, email, firstname])
def get_user(session, lastname):
# TO DO: execute SimpleStatement that retrieves one user from the table
# TO DO: print firstname and age of user
result = session.execute("SELECT * FROM users WHERE lastname = %s", [lastname]).one()
print result.firstname, result.age
def update_user(session, new_age, lastname):
# TO DO: execute SimpleStatement that updates the age of one user
session.execute("UPDATE users SET age =%s WHERE lastname = %s", [new_age, lastname])
def delete_user(session, lastname):
# TO DO: execute SimpleStatement that deletes one user from the table
session.execute("DELETE FROM users WHERE lastname = %s", [lastname])
Copyright 2019 Rebecca Mills
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.