cleanMetadata method
清空所有缓存条目元数据
Implementation
Future<void> cleanMetadata() async {
final db = await _resolveDatabase();
if (db == null) return;
try {
await _metadataStore.delete(db);
} catch (e, st) {
LogUtil.v('RxNetDataBase: cleanMetadata error: $e\n$st');
}
}