Backup Room database

Question

I\'m trying to backup a room database programmatically.

For that, I\'m simply copying the .sqlite file that contains the whole database

But, bef

Answer 1

It already has been answered above. No need to close/re-open database.

I am using MVVM pattern in my android app to back up db file to upload it to google drive. Just want to summarise the solution that worked for me:

Mention below code in your DAO file:

@RawQuery
    int checkpoint(SupportSQLiteQuery supportSQLiteQuery);

Mention below code in your repository file:

    /* Android database has three files under /data/data/com.package.app/databases/
    ** test.db, test.db-shm, test.db-wal - those extra files have recent commits.
    ** To merge data from other shm and wal files to db, run following method - useful before taking backup.
    */
    void checkPoint() {
        ItemRoomDatabase.databaseWriteExecutor.execute(() -> {
           itemDao.checkpoint(new SimpleSQLiteQuery("pragma wal_checkpoint(full)"));
        });
    }

mention following in your ViewModel:

public void checkPoint() {
      itemRepository.checkPoint();
}

Now you can call this method just before doing backup from your Activity file

ItemViewModel itemViewModel = new ViewModelProvider(this).get(ItemViewModel.class);
itemViewModel.checkPoint();