/astra-developer-workshop

astra-developer-workshop

Use Case

Create keyspace and database

DESCRIBE KEYSPACE;

CREATE KEYSPACE mytestapp WITH REPLICATION = { 'class' : 'org.apache.cassandra.locator.NetworkTopologyStrategy', 'dc-1': '1' } AND DURABLE_WRITES = true;

use mytestapp;

Create table users_by_city

CREATE TABLE IF NOT EXISTS users_by_city ( userid uuid, first_name text, last_name text, email text, city text, address text, PRIMARY KEY ((city), email, userid));

Insert some test data

INSERT INTO users_by_city (userid, first_name, last_name, email, city, address) VALUES (now(), 'vikas', 'kumar', 'vikas@demo.com', 'delhi', '110092');

INSERT INTO users_by_city (userid, first_name, last_name, email, city, address) VALUES (now(), 'rahul', 'singh', 'rahul@demo.com', 'mumbai', 'andheri east');

Fetch data from table

SELECT * from users_by_city;

city   | email          | userid                               | address      | first_name | last_name
--------+----------------+--------------------------------------+--------------+------------+-----------
  delhi | vikas@demo.com | dfbea2b0-048b-11eb-8d4b-e7907aa277e7 |       110092 |      vikas |     kumar
 mumbai | rahul@demo.com | 029bf580-048c-11eb-8d4b-e7907aa277e7 | andheri east |      rahul |     singh

Create table product

CREATE TABLE IF NOT EXISTS products ( productid uuid, product_name text, product_category text, product_description text, PRIMARY KEY ((product_category), productid));

Insert some random data

INSERT INTO products (productid, product_name, product_category, product_description) VALUES (now(), 'monitor', 'computer', 'HP 32 inch FHD monitor');

INSERT INTO products (productid, product_name, product_category, product_description) VALUES (now(), 'Keyboard', 'computer accessories', 'Dell US full keyboard');

INSERT INTO products (productid, product_name, product_category, product_description) VALUES (now(), 'iphone 11', 'mobile', 'iphone 11 black color witrh 128 GB internal storage');

Fetch data from table

product_category     | productid                            | product_description                                 | product_name
----------------------+--------------------------------------+-----------------------------------------------------+--------------
             computer | 55155d30-048f-11eb-8d4b-e7907aa277e7 |                              HP 32 inch FHD monitor |      monitor
               mobile | a8354570-048f-11eb-8d4b-e7907aa277e7 | iphone 11 black color witrh 128 GB internal storage |    iphone 11
 computer accessories | 75eea2a0-048f-11eb-8d4b-e7907aa277e7 |                               Dell US full keyboard |     Keyboard

CRUD operation in tables

UPDATE products SET product_description = 'DELL wireless keyboard and mouse combo' WHERE product_category = 'computer accessories' and productid= 75eea2a0-048f-11eb-8d4b-e7907aa277e7;

SELECT * FROM products WHERE product_category = 'computer accessories' AND productid = 75eea2a0-048f-11eb-8d4b-e7907aa277e7;

product_category     | productid                            | product_description                    | product_name
----------------------+--------------------------------------+----------------------------------------+--------------
 computer accessories | 75eea2a0-048f-11eb-8d4b-e7907aa277e7 | DELL wireless keyboard and mouse combo |     Keyboard

DELETE FROM products WHERE product_category = 'computer accessories' AND productid = 75eea2a0-048f-11eb-8d4b-e7907aa277e7;

SELECT * FROM products;

 product_category | productid                            | product_description                                 | product_name
------------------+--------------------------------------+-----------------------------------------------------+--------------
         computer | 55155d30-048f-11eb-8d4b-e7907aa277e7 |                              HP 32 inch FHD monitor |      monitor
           mobile | a8354570-048f-11eb-8d4b-e7907aa277e7 | iphone 11 black color witrh 128 GB internal storage |    iphone 11