How to update a sql server database currently, or after generating an xml using xStream in Java

I would like a help, I need to change a status of a field in a table, after generating an xml using XStream. How could I do to update the table? At the very moment of executing the xml, or after adding all objects to the list.

public class CriarXmlSqlPessoa {

public static void main(String[] args) throws IOException  {
    XStream xstream = new XStream(new DomDriver("UTF8", new NoNameCoder()));
    xstream.alias("contatos", List.class);
    xstream.alias("contato", Pessoa.class);
    ArrayList<Pessoa> pessoas;
    pessoas = new ArrayList<Pessoa>();
    Connection conexao = null;
    new FabricaConexaoMysql();
    try {
     conexao = FabricaConexaoMysql.criarConexao();


    } catch (InstantiationException | IllegalAccessException | ClassNotFoundException | SQLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    ResultSet rs = null;
    try {
        rs = FabricaConexaoMysql.executarSelect(conexao, "SELECT * FROM Pessoa");
    } catch (SQLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    try {
        while(rs.next()) {
            pessoas.add(
                new Pessoa(rs.getInt("id"),
                        rs.getString("nome"),
                        rs.getInt("idade"),
                        rs.getString("status")
                        )
                );
        }
    } catch (SQLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    String contatosEmXml = xstream.toXML(pessoas);
    PrintWriter arquivo = new PrintWriter(new BufferedWriter(new FileWriter("C:\saida.xml")));
    arquivo.println(contatosEmXml);
    arquivo.close();
}