public static void updatePolicy(String membership_status, String policy_type, float value) {
    ResultSet rs;

    String str =
        "update policies set "
            + policy_type
            + " = '"
            + value
            + "' where membership_status = '"
            + membership_status
            + "'";

    DBConnections.query = str;
    int ret = DBConnections.openDbConnectionForUpdate(DBConnections.query);
    DBConnections.closeDbConnection();

    if (ret == 1) {
      System.out.println("Policy update\n");
      DBQueries.listPolicy();
    }
  }