android: do we need to close Db after closing the cursor

Question

From source code of SQLiteCursor (stack trace):

at android.database.sqlite.SQLiteDatabase.dbclose(Native Method)
at android.database.sqlite.SQLiteDatabase.onAllReferencesReleased(SQLiteDatabase.java:325)
at android.database.sqlite.SQLiteClosable.releaseReference(SQLiteClosable.java:45)
at android.database.sqlite.SQLiteProgram.onAllReferencesReleased(SQLiteProgram.java:119)
at android.database.sqlite.SQLiteClosable.releaseReference(SQLiteClosable.java:45)
at android.database.sqlite.SQLiteProgram.close(SQLiteProgram.java:296)
at android.database.sqlite.SQLiteQuery.close(SQLiteQuery.java:136)
at android.database.sqlite.SQLiteCursor.close(SQLiteCursor.java:506)

Does it mean that, closing the last cursor will also close the Database. And we dont need to close it explicitly, as in this code:

    SQLiteDatabase rdb = db.getReadableDatabase();
    Cursor resultCursor = null;
    String patternQuery = SQLiteQueryBuilder.buildQueryString(true, "Store", columns, where, null, null, null, null);

    try
    {
        resultCursor = rdb.rawQuery(patternQuery, null);


        resultCursor.moveToFirst();
        if (resultCursor.getCount() > 0)
        {
            while (!resultCursor.isAfterLast())
            {
                result.add(resultCursor.getString(0));
                resultCursor.moveToNext();
            }
        }
    }
    catch (Exception e)
    {
        Log.d("DB", "Caught an exception while getting pattern based results: " + e);
    }
    finally
    {
        if (resultCursor != null)
        {
            resultCursor.close();
        }
        if (rdb.isOpen())
        {
            rdb.close();
        }
    }

so here, we dont need to close the rdb?

note: the cursor object keeps the reference to the database, so it gets a lock on same on each query. Therefore 'SQLiteDatabse.dbclose' effectively closes same database.

Answer 1

You do need to close it. The database will not be closed until you have explicitly closed it and all active cursors have been closed.