@Override
  public List<Customer> getList() throws SQLException {
    String sql;
    sql = "SELECT * FROM 'customer';";
    System.out.println(sql);

    Statement stmt = dbConnection.getConn().createStatement();
    ResultSet rs = stmt.executeQuery(sql);
    ArrayList<Customer> kundenarray = new ArrayList<Customer>();

    while (rs.next()) {

      Customer kunde =
          new Customer(
              rs.getInt("customerId"),
              rs.getString("name"),
              rs.getString("firstName"),
              rs.getString("address"),
              rs.getString("zip"),
              rs.getString("city"),
              rs.getString("phoneNo"),
              rs.getString("eMail"));

      kunde.setPets(new PetDataMapper().getPetsFromCustomer(kunde.getCustomerId()));

      kundenarray.add(kunde);
    }
    return kundenarray;
  }
 @Override
 public void save(Customer entry) throws SQLException, ValidationException {
   entry.validate();
   if (entry.getCustomerId() <= 0) {
     entry.setCustomerId(insert(entry));
   } else {
     update(entry);
   }
 }
  @Override
  public void update(Customer entry) throws SQLException {
    String sql;
    sql =
        "UPDATE 'customer' SET "
            + "name = \'"
            + entry.getName()
            + "\', "
            + "firstName = '"
            + entry.getFirstName()
            + "', "
            + "address = \'"
            + entry.getAddress()
            + "\', "
            + "zip = \'"
            + entry.getZip()
            + "\', "
            + "city = \'"
            + entry.getCity()
            + "\', "
            + "phoneNo = \'"
            + entry.getPhoneNo()
            + "\', "
            + "eMail = \'"
            + entry.getEMail()
            + "\'"
            + "WHERE customerId = "
            + entry.getID()
            + ";";

    System.out.println(sql);
    Statement stmt = dbConnection.getConn().createStatement();
    stmt.executeUpdate(sql);
  }
  @Override
  public int insert(Customer entry) throws SQLException {

    String sql;
    ResultSet rs = null;
    sql =
        "INSERT INTO 'customer' VALUES (null, '"
            + entry.getName()
            + "', "
            + "\'"
            + entry.getFirstName()
            + "\', \'"
            + entry.getAddress()
            + "\', '"
            + entry.getZip()
            + "\', \'"
            + entry.getCity()
            + "\', \'"
            + entry.getPhoneNo()
            + "\', \'"
            + entry.getEMail()
            + "\');";
    System.out.println(sql);
    Statement stmt = dbConnection.getConn().createStatement();
    stmt.executeUpdate(sql);

    PreparedStatement pstmt =
        dbConnection.getConn().prepareStatement("select max(customerId) max from 'customer';");
    rs = pstmt.executeQuery();
    if (rs.next()) {;
      return rs.getInt("max");
    } else {
      return 0;
    }
  }
  @Override
  public void delete(Customer entry) throws SQLException {
    // Beziehungen zum Tier entfernen
    for (Pet t : entry.getPets()) {
      t.setFkCustomer(-1);
      try {
        new PetDataMapper().save(t);
      } catch (ValidationException e1) {
        // TODO Auto-generated catch block
        e1.printStackTrace();
      }
    }

    String sql;
    sql = "DELETE FROM 'customer' WHERE customerId = " + entry.getCustomerId() + ";";
    System.out.println(sql);
    Statement stmt = dbConnection.getConn().createStatement();
    stmt.executeUpdate(sql);
  }