Question

I have a two tables that are Subject and chapter. I need to display chapter_name by passing
Subject_id. My question is that how to do that? When I pass value id doesn’t return anything.
Please give some hint.
Here is my code for reference.

 public List<ObjectiveWiseQuestion> getAllChapter(long subId)
    {
     List<ObjectiveWiseQuestion>LocwiseProfileList=new ArrayList<ObjectiveWiseQuestion>();
     String selectQuery=("select chapterName from chapter where subject_id ='"+ subId +"'");
      db = this.getWritableDatabase();
        Cursor cursor = db.rawQuery(selectQuery, null);
        if (cursor.moveToFirst())
        {
            do {
                ObjectiveWiseQuestion owq= new ObjectiveWiseQuestion();

                owq.setChapterName(cursor.getString(2));
                LocwiseProfileList.add(owq);
            } while(cursor.moveToNext());
            db.close();

        }

        return LocwiseProfileList;
    }

It also shows illegalState Exception.

Answer 1

change:

owq.setChapterName(cursor.getString(2));

to this:

/* read value from first column (chapterName) i.e. at index 0 */
owq.setChapterName(cursor.getString(0));

and dont forget to close your cursor too right before closing database:

cursor.close();
db.close();