How to make a SQL select query in JAVA?

Question

Java

I make a request for a selection, the result comes out only when I look for the first element of the database. In other cases, there is no result.

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();