Database connection demo added.

FBUtils.php

@@ -91,7 +91,7 @@ public static function login($redirect) {
       $authorize_url = "https://www.facebook.com/dialog/oauth?client_id=$app_id" .
       "&redirect_uri=$home&state=" . $state . "&scope=$scope";
       // Now we redirect the user to the login page
-      echo("<script> top.location.href='" . $authorize_url . "'</script>");
+      echo("<script> window.location.href='" . $authorize_url . "'</script>");
       return false;
     // Once we have that code, we can now request an access-token.  We check to
     // ensure that the state has remained the same.

db.php

@@ -0,0 +1,28 @@
+<?php
+# This function reads your DATABASE_URL config var and returns a connection
+# string suitable for pg_connect. Put this in your app.
+function pg_connection_string_from_database_url() {
+  extract(parse_url($_ENV["DATABASE_URL"]));
+  return "user=$user password=$pass host=$host dbname=" . substr($path, 1); # <- you may want to add sslmode=require there too
+}
+
+# Here we establish the connection. Yes, that's all.
+$pg_conn = pg_connect(pg_connection_string_from_database_url());
+if(!pg_conn)
+{
+  echo("You have not added database yet from terminal issue following command");
+  echo("<code>heroku addons:add shared-database</code>");
+}
+
+# Now let's use the connection for something silly just to prove it works:
+$result = pg_query($pg_conn, "SELECT relname FROM pg_stat_user_tables WHERE schemaname='public'");
+
+print "<pre>\n";
+if (!pg_num_rows($result)) {
+  print("Your connection is working, but your database is empty.\nFret not. This is expected for new apps.\n");
+} else {
+  print "Tables in your database:\n";
+  while ($row = pg_fetch_row($result)) { print("- $row[0]\n"); }
+}
+print "\n";
+?>