You can use the pattern for the top level and the nested query both.
-- Kostya
2011/5/26 adek <adrian.ka...@gmail.com>
> I tried to change my code this way. There is still a problem.
>
> I tried to check for empty rows but even then I've got this exception
> error.
>
> Maybe the problem is in my way of dealing with those two cursors
> (second cursor is in another)
>
> Maybe I'll start from the beggining and you will tell me a better way:
>
> I've got ONE ListView. On this list I'd like to have some values from
> database (easy - done with one cursor)
> but in some list positions there should be values with some conditions
> from another query (second cursor).
>
>
> On May 26, 10:18 am, Kostya Vasilyev <kmans...@gmail.com> wrote:
> > A cursor's initial position is -1, right before the first row, so it's
> quite
> > enough to do this:
> >
> > Cursor cursor = ..... query ...
> > if (cursor != null) {
> > ... get column indices here ....
> > while (cursor.moveToNext()) {
> > ... get data using the indices here ...
> > }
> > cursor.close();
> >
> > }
> >
> > Here it's not necessary to use getCount or moveToFirst, or handle the
> case
> > of no data in any special way.
> >
> > -- Kostya
> >
> > 2011/5/26 adek <adrian.ka...@gmail.com>
> >
> >
> >
> >
> >
> >
> >
> > > Thanks. But this is strange.
> > > When I add this condition
> >
> > > if(cursor.getCount() > 0) }
> > > ...
> >
> > > My ListView is empty. In LogCat everything looks fine.
> >
> > > On May 26, 9:59 am, Senthil ACS <acs....@gmail.com> wrote:
> > > > Hi,
> >
> > > > After you get a cursor object from a query, check the count before
> > > > doing "moveToFirst()".
> >
> > > > if(cursor.getCount() > 0)
> > > > {
> > > > cursor.moveToFirst();
> > > > ... processing ...
> >
> > > > }
> >
> > > > On May 26, 3:12 am, adek <adrian.ka...@gmail.com> wrote:
> >
> > > > > Hello,
> >
> > > > > As a beginner in android java world I need your help. I've got
> problem
> > > > > with famous "CursorIndexOutOfBoundsException".
> >
> > > > > I'm using SQLite db, and I have two cursors, I'm getting some rows
> > > > > from database.
> > > > > I need to get some previous values with some conditions with second
> > > > > cursor (c2) and put these values on ListView.
> >
> > > > > Code works with one exception:
> > > > > "android.database.CursorIndexOutOfBoundsException: Index 0
> requested,
> > > > > with a size of 0".
> >
> > > > > ListView looks OK if I just ignore this exception but I want to fix
> > > > > it.
> >
> > > > > I know it is connected to with Cursor. I tried to check some
> > > > > conditions - it didn't help. Maybe if you could take a look at my
> code
> > > > > you find where is the cause.
> >
> > > > > Code:
> >
> > > > > public void LoadLogGrid()
> > > > > {
> > > > > dbHelper=new DatabaseHelper(this);
> > > > > try
> > > > > {
> >
> > > > > int LogName = (int) spinLog.getSelectedItemId();
> > > > > Cursor c=dbHelper.getLogByLogID(LogName);
> > > > > if (c != null) c.moveToFirst();
> > > > > int count = c.getCount();
> >
> > > > > if (c.moveToFirst()){
> > > > > ArrayList<String> mArrayList = new
> ArrayList<String>();
> >
> > > > > int i=0;
> > > > > do {
> >
> > > > > int sVar1 = c.getInt(c.getColumnIndex("Var1"));
> > > > > Long sId = (long)
> c.getInt(c.getColumnIndex("_id"));
> >
> > > > > Cursor
> c2=dbHelper.getPrevLogByLogID(LogName,sVar1);
> > > > > c2.moveToFirst();
> >
> > > > > if (c2!=null) {
> > > > > String sPrevOdo =
> > > c2.getString(c2.getColumnIndex("Odo"));
> > > > > mArrayList.add(sPrevOdo);
> > > > > c2.close();
> > > > > } else {
> > > > > //stopManagingCursor(c2);
> > > > > //c2.close();
> > > > > Log.d("A:", "Something");
> > > > > }
> >
> > > > > String [] from=new String
> > > []{"Date","Col1","Col2","Col3"};
> > > > > int [] to=new int []
> > > > > {R.id.logDate,R.id.logCol1,R.id.logCol2,R.id.logCol3,R.id.rowOpt2};
> > > > > SimpleCursorAdapter sca=new
> > > > > LogCursorAdapter(this,R.layout.loggridrow,c,from,to,mArrayList);
> > > > > grid.setAdapter(sca);
> > > > > registerForContextMenu(grid);
> > > > > i++;
> >
> > > > > } while (c.moveToNext());
> >
> > > > > c.close();
> >
> > > > > dbHelper.close();
> > > > > }
> >
> > > > > }
> > > > > catch(Exception ex)
> > > > > {
> > > > > AlertDialog.Builder b=new
> AlertDialog.Builder(this);
> > > > > b.setMessage(ex.toString());
> > > > > b.show();
> > > > > }
> >
> > > > > }
> >
> > > > > Query in second cursor:
> >
> > > > > public Cursor getPrevLogByLogID(long LogID, long Var1)
> > > > > {
> > > > > SQLiteDatabase db=this.getReadableDatabase();
> > > > > String[] params=new String[]
> > > > > {String.valueOf(LogID),String.valueOf(Var1)};
> >
> > > > > Cursor c2=db.rawQuery("SELECT LogID as _id, Col1
> from
> > > Log WHERE
> > > > > Col2=? AND Col3<? AND Full=1 ORDER BY Odo DESC", params);
> > > > > if (c2 != null) { c2.moveToFirst();}
> > > > > return c2;
> > > > > }
> >
> > > --
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