osh-cassandra

Openscihub Cassandra

This package is basically a wrapper around the Node.JS cassandra-driver, which does the heavy lifting with the CQL protocol. Its purpose is to help build CQL query strings based on config objects.

Usage

var merge = require('xtend/immutable');
var CassandraTable = require('osh-cassandra').Table;
var CassandraClient = require('cassandra-driver').Client;
 
// First define your POJO model using the POD scheme. Add a
// "storage" attribute to each POD to tell the CassandraTable
// mixin how and if it should store the thing.
 
var UserModel = {
  attrs: {
    username: {
      validate: function(username) {
        if (!/^[a-z]+$/.test(username)) {
          return 'Must be a-z';
        }
      },
      storage: {
        cassandra: 'ascii',
        pg: 'varchar(32)'
      }
    }
  },
  key: ['username']
};
 
// Now imbue it with Cassandra creation, storage, and retrieval.
var UserTable = merge(UserModel, CassandraTable);
 
UserTable.client = new CassandraClient({ /* driver options */ });
UserTable.create(function(err) {});
UserTable.drop(function(err) {});
UserTable.insert({ /* opts */ }, function(err) {});
UserTable.select({ /* opts */ }, function(err) {});

Documentation

Table

create(callback)

drop(callback)

select(opts, callback)

• opts Object, required
  • opts.where String, required
  • opts.consistency
• callback Function(err, results), required

Testing

First, follow the instructions here to start a Cassandra instance in VirtualBox:

• http://planetcassandra.org/install-cassandra-ova-on-virtualbox/