How to fix / get an error response when starting invalid BigQuery jobs?

Question

In this code, I am trying to run select on a table that does not exist getJobReference()returns NULL, and I would like to catch such an error and would like to receive an error message received in some way.

How to get an error message if something fails?

$client = new Google_Client();
$client->setApplicationName("Client_Library_Examples");
//$client->setDeveloperKey(API_KEY);

if (isset($_SESSION['service_token'])) {
    $client->setAccessToken($_SESSION['service_token']);
}
$key = file_get_contents($key_file_location);
$cred = new Google_Auth_AssertionCredentials(
        $service_account_name, array(
    'https://www.googleapis.com/auth/bigquery',
        ), $key
);
$client->setAssertionCredentials($cred);
if ($client->getAuth()->isAccessTokenExpired()) {
    $client->getAuth()->refreshTokenWithAssertion($cred);
}
$_SESSION['service_token'] = $client->getAccessToken();
var_dump($_SESSION);
$bq = new Google_Service_Bigquery($client);

//build query
$sql = 'select * from example.table LIMIT 10';

$job = new Google_Service_Bigquery_Job();
$config = new Google_Service_Bigquery_JobConfiguration();
$queryConfig = new Google_Service_Bigquery_JobConfigurationQuery();
$config->setQuery($queryConfig);

$job->setConfiguration($config);
$queryConfig->setQuery($sql);

$insert = new Google_Service_Bigquery_Job($bq->jobs->insert(PROJECT_ID, $job));
$jr = $insert->getJobReference();
var_dump($jr);/*THIS RETURNS NULL */
$jobId = $jr['jobId'];

$res = new Google_Service_Bigquery_GetQueryResultsResponse($bq->jobs->getQueryResults(PROJECT_ID, $jobId));

//see the results made it as an object ok:
var_dump($res);

Answer 1

Their API automatically creates some classes on the fly, and errors are created when they are created.

I ended up after the debugging process to get errors like this:

try {
    $job = $bq->jobs->insert(PROJECT_ID, $job);
    $status = new Google_Service_Bigquery_JobStatus();
    $status = $job->getStatus();
//    print_r($status);
    if ($status->count() != 0) {
        $err_res = $status->getErrorResult();
        die($err_res->getMessage());
    }
} catch (Google_Service_Exception $e) {
    echo $e->getMessage();
    exit;
}

- , Status . , , dryRun .

$config->setDryRun(true);

Answer 2

SDK, , ?

try {
    $insert = new Google_Service_Bigquery_Job($bq->jobs->insert(PROJECT_ID, $job));
}
catch (Exception $e) //or probably better Google_Exception
{
    print('Something went wrong');
}