Query Amazon DynamoDB Data as a SQL Server Database in Node.js

You can use CData Connect Cloud to query Amazon DynamoDB data through a SQL Server interface. Follow the procedure below to create a virtual database for Amazon DynamoDB in Connect Cloud and start querying using Node.js.

CData Connect Cloud provides a pure MySQL, cloud-to-cloud interface for Amazon DynamoDB, allowing you to easily query live Amazon DynamoDB data in Node.js — without replicating the data to a natively supported database. As you query data in Node.js, CData Connect Cloud pushes all supported SQL operations (filters, JOINs, etc) directly to Amazon DynamoDB, leveraging server-side processing to quickly return Amazon DynamoDB data.

Configure Amazon DynamoDB Connectivity for NodeJS

Connectivity to Amazon DynamoDB from NodeJS is made possible through CData Connect Cloud. To work with Amazon DynamoDB data from NodeJS, we start by creating and configuring a Amazon DynamoDB connection.

1. Log into Connect Cloud, click Connections and click Add Connection
2. Select "Amazon DynamoDB" from the Add Connection panel
3. Enter the necessary authentication properties to connect to Amazon DynamoDB.

   The connection to Amazon DynamoDB is made using your AccessKey, SecretKey, and optionally your Domain and Region. Your AccessKey and SecretKey can be obtained on the security credentials page for your Amazon Web Services account. Your Region will be displayed in the upper left-hand corner when you are logged into DynamoDB.

4. Click Create & Test
5. Navigate to the Permissions tab in the Add Amazon DynamoDB Connection page and update the User-based permissions.

Add a Personal Access Token

If you are connecting from a service, application, platform, or framework that does not support OAuth authentication, you can create a Personal Access Token (PAT) to use for authentication. Best practices would dictate that you create a separate PAT for each service, to maintain granularity of access.

1. Click on your username at the top right of the Connect Cloud app and click User Profile.
2. On the User Profile page, scroll down to the Personal Access Tokens section and click Create PAT.
3. Give your PAT a name and click Create.
4. The personal access token is only visible at creation, so be sure to copy it and store it securely for future use.

With the connection configured, you are ready to connect to Amazon DynamoDB data from Node.js.

Query Amazon DynamoDB from Node.js

The following example shows how to define a connection and execute queries to Amazon DynamoDB with the SQL Server module. You will need the following information:

• server: tds.cdata.com
• port: 14333
• user: a Connect Cloud user (e.g. user@mydomain.com)
• password: the PAT for the above user
• database: The connection you configured for Amazon DynamoDB (AmazonDynamoDB1)

Connect to Amazon DynamoDB data and start executing queries with the code below:

var sql = require('mssql')
var config = {
	server: 'tds.cdata.com',
	port: 14333, 
	user: 'user@mydomain.com', //update me
	password: 'CONNECT_USER_PAT', //update me	
	options: {
		encrypt: true,
		database: 'AmazonDynamoDB1'
	}
}

sql.connect(config, err => { 
    if(err){
        throw err ;
    }
    new sql.Request().query('SELECT * FROM Lead', (err, result) => {
        console.dir(result)
    })
        
});

sql.on('error', err => {
    console.log("SQL Error: " ,err);
})