Access Teiid from node.js

Are you writing a "node.js" application and would like to access Teiid VDB from it?

If "yes", this is currently possible using NPM package "pg".  Since, Teiid supports the PG transport, you can use this PostgreSQL client for "node.js" for accessing the Teiid.

For example if you have VDB called "northwind" deployed on your Teiid server, and it has table called "customers" and you are using default configuration such as

user = 'user'
password = 'user'
host = 127.0.0.1
port = 35432

then you can use following to write simple access program to Teiid

    
    var pg = require('pg');
    var connectionString = "pg://user:user@localhost:35432/northwind"
    pg.connect(connectionString, function(err, client) {
        client.query('SELECT CustomerID, ContactName, ContactTitle FROM Customers', function(err, result) {
        console.log(result.rows)
    });
    });

If you want access one row at a time, you can also use event mechanism and write

    var pg = require('pg');
    var connectionString = "pg://user:user@localhost:35432/northwind"
    pg.connect(connectionString, function(err, client) {
        var query = client.query('SELECT CustomerID, ContactName, ContactTitle FROM Customers');
        query.on('row', function(row) {
            console.log(row);
        });
        query.on('error', function(error) {
            console.log("failed to query");
        });
        query.on('end', function(error) {
            console.log("closing client");
            client.end();
        });
    });

For more information please take look at

https://npmjs.org/package/pg
https://github.com/brianc/node-postgres

If you do write an application using these please do share your experiences with us.