+ /**
+ * Get appropriate schema variables in the current database connection.
+ *
+ * This should be called after any request data has been imported, but before
+ * any write operations to the database. The result should be passed to the DB
+ * setSchemaVars() method.
+ *
+ * @return array
+ * @since 1.28
+ */
+ public function getSchemaVars() {
+ return []; // DB-type specific
+ }
+