fix: fix for database name in batch create request (#883)

* tests

* changes

Author: asthamohta

google/cloud/spanner_v1/pool.py

@@ -193,7 +193,7 @@ def bind(self, database):
         metadata = _metadata_with_prefix(database.name)
         self._database_role = self._database_role or self._database.database_role
         request = BatchCreateSessionsRequest(
-            database=database.database_id,
+            database=database.name,
             session_count=self.size - self._sessions.qsize(),
             session_template=Session(creator_role=self.database_role),
         )
@@ -406,7 +406,7 @@ def bind(self, database):
         self._database_role = self._database_role or self._database.database_role
 
         request = BatchCreateSessionsRequest(
-            database=database.database_id,
+            database=database.name,
             session_count=self.size - created_session_count,
             session_template=Session(creator_role=self.database_role),
         )

tests/system/test_database_api.py

@@ -97,7 +97,7 @@ def test_database_binding_of_fixed_size_pool(
         default_timeout=500,
         database_role="parent",
     )
-    database = shared_instance.database(temp_db.name, pool=pool)
+    database = shared_instance.database(temp_db_id, pool=pool)
     assert database._pool.database_role == "parent"
 
 
@@ -125,7 +125,7 @@ def test_database_binding_of_pinging_pool(
         ping_interval=100,
         database_role="parent",
     )
-    database = shared_instance.database(temp_db.name, pool=pool)
+    database = shared_instance.database(temp_db_id, pool=pool)
     assert database._pool.database_role == "parent"