How can I initialize the database once? Singleton pattern

[a13020796019]

@Database( version: 1, entities: [StaffInfoModel, MeetingInfoModel, MeetingFileInfoModel]) abstract class SqliteDatabase extends FloorDatabase { StaffInfoDao get staffInfoDao; MeetingInfoDao get meetingInfoDao; MeetingFileInfoDao get meetingFileInfoDao; }

final database = await $FloorSqliteDatabase .databaseBuilder('app_database.db') .build();

      final meetingInfoDao = database.meetingInfoDao;
      ///先删除
      await meetingInfoDao.deleteMeetingInfoByConferId(
          applicationController.uuid, conferController.conferId!);
      final MeetingInfoModel meetingInfo = MeetingInfoModel(
          conferId: conferController.conferId!,
          uuid: '',
          name: homeDetailEntity.meeting!.title!,
          startTime: homeDetailEntity.meeting!.startTime!,
          endTime: '',
          room: homeDetailEntity.meeting!.room!);

      meetingInfoDao.insertMeetingInfo(meetingInfo);