Java1

public class Prueba {

    public static void main(String[] args) {

            Class.forName("com.mysql.jdbc.Driver");
            Connection conexion = DriverManager.getConnection("jdbc:mysql://localhost/tgi_cdu", "root", "123");
            Statement st = conexion.createStatement();
            Statement stUpdate = conexion.createStatement();
            String query = "SELECT causer_k USUARIO, caclav_k CLAVE FROM claves WHERE caclav_k IS NOT NULL";

            ResultSet rs = st.executeQuery(query);

            while (rs.next()) {
                String user = rs.getString("USUARIO");
                String nuevaClave = SessionHandler.getHash("123", user);

                String updateQuery = "UPDATE claves SET caclav_k = '" + nuevaClave + "' WHERE causer_k = '" + user + "'";

                int rows = stUpdate.executeUpdate(updateQuery);

                if (rows == 0) {
                    System.out.println("User " + user + " no pudo ser actualizado.");
                } else {
                    System.out.println("User " + user + " actualizado correctamente.");
                }
            }

            rs.close();

            Statement stUpdateClave = conexion.createStatement();
            String queryUpdateClave = "UPDATE tgi_cdu.director SET valor = '123' WHERE codigo = 'CLAVEWS'";
            Statement stUpdateServer = conexion.createStatement();
            String queryUpdateServer = "UPDATE tgi_cdu.director SET valor = 'http://localhost:8080/GAT_CDU WHERE codigo = 'URLWS'";

            System.out.println("Clave WS Actualizado: " + stUpdateClave.executeUpdate(queryUpdateClave));
            System.out.println("Server WS Actualizado: " + stUpdateServer.executeUpdate(queryUpdateServer));
        }
}