Query MarkLogic Data as a SQL Server Database in Node.js

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

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

Configure MarkLogic Connectivity for NodeJS

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

1. Log into Connect AI, click Sources, and then click Add Connection

2. Select "MarkLogic" from the Add Connection panel

3. Enter the necessary authentication properties to connect to MarkLogic.

   Set User, Password, and Server to the credentials for the MarkLogic account and the address of the server you want to connect to. You should also specify the REST API Port if you want to use a specific instance of a REST Server.

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

Add a Personal Access Token

When connecting to Connect AI through the REST API, the OData API, or the Virtual SQL Server, a Personal Access Token (PAT) is used to authenticate the connection to Connect AI. It is best practice to create a separate PAT for each service to maintain granularity of access.

1. Click on the Gear icon () at the top right of the Connect AI app to open the settings page.
2. On the Settings page, go to the Access Tokens section and click Create PAT.
3. Give the 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 and a PAT generated, you are ready to connect to MarkLogic data from Node.js.

Query MarkLogic from Node.js

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

• server: tds.cdata.com
• port: 14333
• user: a Connect AI user (e.g. [email protected])
• password: the PAT for the above user
• database: The connection you configured for MarkLogic (MarkLogic1)

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

var sql = require('mssql')
var config = {
	server: 'tds.cdata.com',
	port: 14333, 
	user: '[email protected]', //update me
	password: 'CONNECT_USER_PAT', //update me	
	options: {
		encrypt: true,
		database: 'MarkLogic1'
	}
}

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

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