cassandra-paginator v0.1.4

cassandra-paginator

Apache Cassandra® CQL lacks the OFFSET parameter that SQL and some other languages have. The CassandraPaginator is built to incorporate this abstraction, allowing you to paginate and "jump around" in the query results without needing to re-query the database.

Cassandra Paginator is a utility library designed to facilitate efficient pagination of query results from Cassandra.

Features

• Abstracts driver "fetch pages" from client "user pages."
• Access user pages out-of-order and repeatedly.
• Lazy fetching: data pulled from the database in fetchSize chunks, but only as needed to satisfy the page request.

Getting Started

These instructions will get you a copy of the project up and running on your local machine for development and testing purposes.

Installing

npm install cassandra-paginator

Usage

Here's a quick example to get you started:

const { CassandraPaginator } = require('cassandra-paginator');
const { Client } = require('cassandra-driver');

// Initialize your Cassandra client
const client = new Client({ contactPoints: ['localhost'], localDataCenter: 'datacenter1' });

// Create a new paginator instance
const paginator = new CassandraPaginator(client, "SELECT * FROM your_table WHERE condition = ? LIMIT 19", ['value'], {}, {pageSize: 5});

// Get first page
await paginator.getPage(1).then(page => {
  console.log(`page number: ${paginator.getCurrentPageNumber()}`)
  console.log(page);
});
// Skip a page
await paginator.getPage(3).then(page => {
  console.log(`page number: ${paginator.getCurrentPageNumber()}`)
  console.log(page);
});
// Get the next page
await paginator.getNextPage().then(page => {
  console.log(`page number: ${paginator.getCurrentPageNumber()}`)
  console.log(page);
});
// Go back a page
await paginator.getPage(2).then(page => {
  console.log(`page number: ${paginator.getCurrentPageNumber()}`)
  console.log(page);
});
// Revisit a page
await paginator.getPage(4).then(page => {
  console.log(`page number: ${paginator.getCurrentPageNumber()}`)
  console.log(page);
});
// Go beyond the end of the data
await paginator.getNextPage().then(page => {
  console.log(`page number: ${paginator.getCurrentPageNumber()}`)
  console.log(page);
});
// Get a non-existent page
await paginator.getPage(5).then(page => {
  console.log(`page number: ${paginator.getCurrentPageNumber()}`)
  console.log(page);
});

API Documentation

For detailed API documentation, see CassandraPaginator.

License

This project is licensed under the MIT License - see the LICENSE.txt file for details.