Java开发如何把数据库里的未付款订单改成已付款

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface Sign {
}

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface Validate {
}

@Target(ElementType.FIELD)
@Retention(RetentionPolicy.RUNTIME)
public @interface SignField {
}

@Target(ElementType.FIELD)
@Retention(RetentionPolicy.RUNTIME)
public @interface ValidField {
}

public class Order {
    @SignField
    private String sn;
    @SignField
    private String amt;
    @SignField
    private int status;
    @SignField
    private int userId;
    @ValidField
    private String sign;
}

@Pointcut("execution(@com.example.demo.annotations.Sign * *(..))")
public void signPointCut() {
 
}
 
@Pointcut("execution(@com.example.demo.annotations.Validate * *(..))")
public void validatePointCut() {
 
}

@Around("signPointCut()")
public Object signAround(ProceedingJoinPoint pjp) throws Throwable {
    Object[] args = pjp.getArgs();
    for (Object o : args) {
        System.out.println(o);
        sign(o);
    }
    Object res = pjp.proceed(args);
    return res;
}
 
@Around("validatePointCut()")
public Object validateAround(ProceedingJoinPoint pjp) throws Throwable {
    Object[] args = pjp.getArgs();
    Object res = pjp.proceed(args);
    valid(res);
    return res;
}

private Map<String, String> getSignMap(Object o) throws IllegalAccessException {
    Map<String, String> fieldNameToValue = new HashMap<>();
    for (Field f : o.getClass().getDeclaredFields()) {
        System.out.println(f.getName());
        for (Annotation annotation : f.getDeclaredAnnotations()) {
            if (annotation.annotationType().equals(SignField.class)) {
                String value = "";
                f.setAccessible(true);
                fieldNameToValue.put(f.getName(), f.get(o).toString());
            }
        }
    }
    return fieldNameToValue;
}

private String getSign(Map<String, String> fieldNameToValue) {
    List<String> names = new ArrayList<>(fieldNameToValue.keySet());
    StringBuilder sb = new StringBuilder();
    for (String name : names)
        sb.append(name).append("@").append(fieldNameToValue.get(name));
    System.out.println(sb.append("日暮与星辰之间").toString());
    String signValue = DigestUtils.md5DigestAsHex(sb.toString().getBytes(StandardCharsets.UTF_8));
    return signValue;
}

private Field getValidateFiled(Object o) {
    for (Field f : o.getClass().getDeclaredFields()) {
        for (Annotation annotation : f.getDeclaredAnnotations()) {
            if (annotation.annotationType().equals(ValidField.class)) {
                return f;
            }
        }
    }
    return null;
}

public void sign(Object o) throws IllegalAccessException {
    Map<String, String> fieldNameToValue = getSignMap(o);
    if (fieldNameToValue.isEmpty()) {
        return;
    }
    Field validateField = getValidateFiled(o);
    if (validateField == null)
        return;
    String signValue = getSign(fieldNameToValue);
    validateField.setAccessible(true);
    validateField.set(o, signValue);
}

public void valid(Object o) throws IllegalAccessException {
    Map<String, String> fieldNameToValue = getSignMap(o);
    if (fieldNameToValue.isEmpty()) {
        return;
    }
    Field validateField = getValidateFiled(o);
    validateField.setAccessible(true);
    String signValue = getSign(fieldNameToValue);
    if (!Objects.equals(signValue, validateField.get(o))) {
        throw new RuntimeException("数据非法");
    }
 
}

@Sign
public Order save( Order order){
    orderList.add(order);
    return order;
}

@Validate
public Order query(@ String sn){
   return orderList.stream().filter(e -> e.getSn().equals(sn)).findFirst().orElse(null);
}