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Azure Function: Node.js app to read PostgreSQL data with query parameter and return JSON
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// Azure Function: Node.js code to read PostgreSQL data with query parameter and return results as JSON | |
// Author: Dhyanendra Singh Rathore | |
// Import the pg (node-postgres) library | |
const pg = require('pg'); | |
// Entry point of the function | |
module.exports = async function(context, req) { | |
// Define variables to store connection details and credentials | |
const config = { | |
host: process.env["POSTGRES_SERVER_NAME"], | |
user: process.env["POSTGRES_USER"], | |
password: process.env["POSTGRES_USER_PASS"], | |
database: 'iso3166', | |
port: 5432, | |
ssl: true | |
}; | |
// req.query.country will be passed as query variable in the URL | |
const values = [req.query.country]; | |
// Create query to execute against the database | |
const text = 'SELECT * FROM public.subcountry subcon' + (values[0] != undefined ? ' WHERE subcon."country" IN ($1)' : ''); | |
const querySpec = { | |
text: text, | |
values: (values[0] != undefined ? values : '') | |
} | |
try { | |
// Create a pool of connections | |
const pool = new pg.Pool(config); | |
// Get a new client connection from the pool | |
const client = await pool.connect(); | |
// Execute the query against the client | |
const result = await client.query(querySpec); | |
// Release the connection | |
client.release(); | |
// Return the query resuls back to the caller as JSON | |
context.res = { | |
status: 200, | |
isRaw: true, | |
body: result.rows, | |
headers: { | |
'Content-Type': 'application/json' | |
} | |
}; | |
} catch (err) { | |
context.log(err.message); | |
} | |
} |
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