Problems that I execute request and result leaves only when the first record in a DB is appropriated to the cursor. In other cases, there is no result, how?

Question

Java

c = database.rawQuery("SELECT width750to1000 FROM depth WHERE _id = 4",null);

                if (c!=null && c.moveToFirst() ){
                    String str;
                    do{
                        
                        str = c.getString(c.getColumnIndexOrThrow("width750to1000"));
                        textView.setText(str);

                    }
                    while (c.moveToNext());

                }
                c.close();