如何在php中为GAE数据存储生成实体ID？

Question

i am trying to insert new entity using PHP client library into datastore, i am using datastore_connect.php file from this example, https://github.com/amygdala/appengine_php_datastore_example

I want to insert entity with auto id, not the name. I see that there is function setId(), but i dont know how to generate proper id. Whats the best practice in doing so?

Thanks

function createKeyForTestItem () {
    $path = new Google_Service_Datastore_KeyPathElement();
    $path->setKind("testkind");
    $path->setName("testkeyname");
    //$path->setId(??)
    $key = new Google_Service_Datastore_Key();
    $key->setPath([$path]);
    return $key;
}

Answer 1

You can have Cloud Datastore generate the ID for you by populating the insertAutoId field on the mutation instead of the upsert field.

Here's a code snippet (adapted from the datastore_connect.php file you posted):

function create_key() {
  $path = new Google_Service_Datastore_KeyPathElement();
  $path->setKind("testkind");
  // Neither name nor ID is set.
  $key = new Google_Service_Datastore_Key();
  $key->setPath([$path]);
  return $key;
}
function create_entity() {
  $entity = new Google_Service_Datastore_Entity();
  $entity->setKey(create_key());
  // Add properties...
  return $entity;
}
function create_commit_request() {
  $entity = create_entity();
  $mutation = new Google_Service_Datastore_Mutation();
  $mutation->setInsertAutoId([$entity]);  // Causes ID to be allocated.
  $req = new Google_Service_Datastore_CommitRequest();
  $req->setMode('NON_TRANSACTIONAL');
  $req->setMutation($mutation);
  return $req;
}