check value if exist sqlite error insert

Question

i have a method to insert data and check when code is exists or not

if exist dont create insert and if not exists will create insert

but when i try to running the data cant insert to a database

here is my insert code

public void processAddA(DialogWrapper wrapper)
               {
           ContentValues values = new ContentValues(2);

            values.put(DatabaseHelper.CODE, wrapper.getCode());
            values.put(DatabaseHelper.ALAMAT, wrapper.getAlamat());
            values.put(DatabaseHelper.BATAS, wrapper.getBatas());
            values.put(DatabaseHelper.LAT, wrapper.getLat());
            values.put(DatabaseHelper.LON, wrapper.getLon());
            values.put(DatabaseHelper.LUAS, wrapper.getLuas());
            values.put(DatabaseHelper.TANGGAL_AWAL, wrapper.getTglA());
            values.put(DatabaseHelper.TANGGAL_AKHIR, wrapper.getTglB());
            values.put(DatabaseHelper.USER_ID, wrapper.getUser());
            values.put(DatabaseHelper.SENT, "0");

                  open();
                  //check if value exist or not.
                  Cursor c = database.rawQuery("SELECT * FROM petak_tetap where code='"
                            + wrapper.getCode() + "'", null);
                  if(c == null)
                  {
                  //doesn't exists therefore insert record.
                      database.insert("petak_tetap", DatabaseHelper.ALAMAT,
                                values);
                  }
                  close();
               }

how to fix that?

Answer 1

use this condition it will work

if (c!=null && c.getCount()==0)