Having a quick go with Heroku buttons!

app/config/heroku/database.php

@@ -0,0 +1,20 @@
+<?php
+
+	$dbURL = parseurl(getenv('CLEARDB_DATABASE_URL'));
+	$dbName = substr($dbURL["path"], 1);
+
+	return array(
+		'default' => 'cleardb',
+		'connections' => array(
+			'cleardb' => array(
+				'driver'    => 'mysql',
+				'host'      => $dbURL['host'],
+				'database'  => $dbName,
+				'username'  => $dbURL['user'],
+				'password'  => $dbURL['pass'],
+				'charset'   => 'utf8',
+				'collation' => 'utf8_unicode_ci',
+				'prefix'    => '',
+			),
+		)
+	);