db_get1.java

public synchronized String getDataValue(long _id) {
        final SQLiteDatabase db = this.getReadableDatabase();
        String retval = null;
        try {
            Cursor cursor = db.query("data", new String[]{"VALUE"},
                    "ID = ?", new String[]{String.valueOf(_id)}, null, null, null);
            if (cursor != null) {
                if (cursor.moveToFirst()) {
                    do {
                        retval = cursor.getString(0);
                    } while (cursor.moveToNext());
                }
            }
        } catch (Exception ex) {
            retval = null;
            Log.e(TAG, "Cannot get data value:", ex);
        } finally {
            db.close();
        }
        return retval;
}