Combining Relational SQL and NoSQL
php
Description
Do you utilize both NoSQL and SQL databases but wish there was a way to interact with both databases in a single API call? Well this is the script for you! Whether you are connecting MySQL to MongoDB or SQL Server to Couchbase it is easily achievable in a few lines of code.
This script runs after a GET on the service db at db/_table/contact. For each record in the response, it queries MongoDB to get another field, specifically the Twitter handle for the contact. It adds that to the response as a field named 'from_mongo_twitter'. For this change to take effect, you have to enable modification of response in the Admin Console script editor. Check the box 'Allow script to modify request (pre-process) or response (post-process)'.
Code
$content = $event['response']['content'];
$api = $platform['api'];
$get = $api->get;
if (isset($content['resource']) && !empty($content['resource'])) {
foreach($content['resource'] as $k => $record){
// filter by email
$params = [
'filter' => 'email=' . $record['email']
];
// get matching record from MongoDB service
$result = $get('mongodb/_table/contact', $params);
// from_mongo_twitter can be a field in MySQL schema, but it doesn't have to be
$record['from_mongo_twitter'] = $result['content']['resource'][0]['twitter'];
$event['response']['content']['resource'][$k] = $record;
}
}
