Book Image

Learning Apache Cassandra - Second Edition

Book Image

Learning Apache Cassandra - Second Edition

Overview of this book

Cassandra is a distributed database that stands out thanks to its robust feature set and intuitive interface, while providing high availability and scalability of a distributed data store. This book will introduce you to the rich feature set offered by Cassandra, and empower you to create and manage a highly scalable, performant and fault-tolerant database layer. The book starts by explaining the new features implemented in Cassandra 3.x and get you set up with Cassandra. Then you’ll walk through data modeling in Cassandra and the rich feature set available to design a flexible schema. Next you’ll learn to create tables with composite partition keys, collections and user-defined types and get to know different methods to avoid denormalization of data. You will then proceed to create user-defined functions and aggregates in Cassandra. Then, you will set up a multi node cluster and see how the dynamics of Cassandra change with it. Finally, you will implement some application-level optimizations using a Java client. By the end of this book, you'll be fully equipped to build powerful, scalable Cassandra database layers for your applications.
Table of Contents (14 chapters)

Inserting data


For our status-sharing application, the first thing we'll want any user to do is to create an account. We'll ask them to choose a username column, enter their email column, and pick a password column; our business logic will be responsible for ensuring that the entries are valid and for encrypting the password appropriately. At that point, we'll be ready to insert the account information as a new row in the users table:

 INSERT INTO "users"
 ("username", "email", "encrypted_password")
 VALUES (
   'alice',
   '[email protected]',
   0x8914977ed729792e403da53024c6069a9158b8c4
 );

 

In the previous statement, which should be familiar to anyone who has used an SQL database, we provide the following information:

  • We want to add a row to the users table
  • We'll be adding data to three columns in that row: username, email, and encrypted_password
  • Finally, we provide the values to insert into those columns in the same order that the column names were listed previously

Note

Does whitespace matter...