Spanner Batch Query Sample (GoogleCloudPlatform#563)

* Spanner Batch Query Sample

* ran linter

Author: ryanmats

spanner/composer.json

@@ -22,7 +22,8 @@
             "src/create_storing_index.php",
             "src/query_data_with_new_column.php",
             "src/read_only_transaction.php",
-            "src/read_stale_data.php"
+            "src/read_stale_data.php",
+            "src/batch_query_data.php"
         ]
     }
 }

spanner/composer.lock

@@ -216,6 +216,18 @@
     })
 );
 
+// Batch query data command
+$application->add((new Command('batch-query-data'))
+    ->setDefinition($inputDefinition)
+    ->setDescription('Batch queries sample data from the database using SQL.')
+    ->setCode(function ($input, $output) {
+        batch_query_data(
+            $input->getArgument('instance_id'),
+            $input->getArgument('database_id')
+        );
+    })
+);
+
 // for testing
 if (getenv('PHPUNIT_TESTS') === '1') {
     return $application;