Query Google Spanner Data as a SQL Server in Node.js

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

CData Connect Server provides a pure SQL Server interface for Google Spanner, allowing you to easily build reports from live Google Spanner data in Node.js — without replicating the data to a natively supported database. As you build visualizations, Node.js generates SQL queries to gather data. Using optimized data processing out of the box, CData Connect Server pushes all supported SQL operations (filters, JOINs, etc) directly to Google Spanner, leveraging server-side processing to quickly return the requested Google Spanner data.

Create a Virtual SQL Server Database for Google Spanner Data

CData Connect Server uses a straightforward, point-and-click interface to connect to data sources and generate APIs.

1. Login to Connect Server and click Connections.
2. Select "Google Spanner" from Available Data Sources.
3. Google Spanner uses OAuth to authenticate. Click Connect to authenticate with Google Spanner.
4. Click Privileges -> Add and add the new user (or an existing user) with the appropriate permissions.

With the virtual database created, you are ready to connect to Google Spanner data from Node.js.

Query Google Spanner from Node.js

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

• Host name, or address, and port: The address of your Connect Server instance and the port (1433)
• Username and password: The username and password of a user you authorized on Connect Server
• Database name: The database you configured for Google Spanner (GoogleSpanner1)

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

const sql = require('mssql');

const config = {
    user: 'your_connect_username', 
    password: 'your_connect_password', 
    server: 'connect_server_url', 
    port: 1433, // optional, defaults to 1433
    database: 'GoogleSpanner1',
    authentication: {
        type: 'default'
    },
    options: {
        encrypt: true
    }
}

console.log("Starting...");
connectAndQuery();

async function connectAndQuery() {
    try {
        var poolConnection = await sql.connect(config);

        console.log("Reading rows from the table...");
        var resultSet = await poolConnection.request().query(`SELECT * FROM table_name`);

        console.log(`${resultSet.recordset.length} rows returned.`);

        // output column headers
        var columns = "";
        for (var column in resultSet.recordset.columns) {
            columns += column + ", ";
        }
        console.log("%s	", columns.substring(0, columns.length - 2));

        // ouput row contents from default record set
        resultSet.recordset.forEach(row => {
            console.log("%s	%s", row.CategoryName, row.ProductName);
        });

        // close connection only when we're certain application is finished
        poolConnection.close();
    } catch (err) {
        console.error(err.message);
    }
}

SQL Server Access to Google Spanner Data from Node.js

You have retrieved live Google Spanner Data using Node.js. Now, you can easily access data sources and more — all without replicating Google Spanner data.

To get SQL data access to 200+ SaaS, Big Data, and NoSQL sources directly from your applications, try CData Connect Server.