尝试使用GDS访问Google Cloud Datastore

Question

I'm using Tom Walder's GDS PHP Library to access Google Datastore.

https://github.com/tomwalder/php-gds

This is my latest attempt:

require_once 'src/GDS/Entity.php';
require_once 'src/GDS/Gateway.php';
require_once 'src/GDS/Mapper.php';
require_once 'src/GDS/Schema.php';
require_once 'src/GDS/Store.php';
require_once 'src/GDS/Exception/Contention.php';
require_once 'src/GDS/Exception/GQL.php';
require_once 'src/GDS/Gateway/GoogleAPIClient.php';
require_once 'src/GDS/Gateway/ProtoBuf.php';
require_once 'src/GDS/Mapper/GoogleAPIClient.php';
require_once 'src/GDS/Mapper/ProtoBuf.php';
require_once 'src/GDS/Mapper/ProtoBufGQLParser.php';
require_once 'src/GDS/Property/Geopoint.php';

// Build a new entity
$obj_book = new GDS\Entity();
$obj_book->title = 'Romeo and Juliet';
$obj_book->author = 'William Shakespeare';
$obj_book->isbn = '1840224339';

// Write it to Datastore
$obj_store = new GDS\Store('Book');
$obj_store->upsert($obj_book);

$obj_store = new GDS\Store('Book');
foreach($obj_store->fetchAll() as $obj_book) {
    echo "Title: {$obj_book->title}, ISBN: {$obj_book->isbn} <br />", PHP_EOL;
}

Which is producing this error:

Fatal error: Uncaught exception 'Exception' with message 'Could not determine DATASET, please pass to GDS\Gateway\ProtoBuf::__construct()' in /var/www/html/src/GDS/Gateway/ProtoBuf.php:70 Stack trace: #0 /var/www/html/src/GDS/Store.php(81): GDS\Gateway\ProtoBuf->__construct() #1 /var/www/html/test.php(32): GDS\Store->__construct('Book') #2 {main} thrown in /var/www/html/src/GDS/Gateway/ProtoBuf.php on line 70

I'm trying really hard to get this to work. If any of you could help me I'd really appreciate it!

Answer 1

It looks like you are trying to run this script from the command line?

If you run it from a GAE "web" environment (like the local web server or live AppEngine) then the DATASET will be defined by the environment.

Can you confirm exactly how you are trying to use the library? Then I can give you pointers.

For now - try running your code in response to a web request (ie from http://localhost:8080/test.php - or whatever)

Answer 2

Yes, I am the author of the library.

If you are running on compute engine, you need to use the "JSON" Google Gateway.

There should be some samples on GitHub.