entityMap|blocks|key|fhemj|text|您可以编写仅更新特定字段的自定义更新查询：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|24pv9|@Override
public+void+saveManager(Manager+manager)+{++
++++Query+query+=+sessionFactory.getCurrentSession().createQuery("update+Manager+set+username+=+:username,+password+=+:password+where+id+=+:id");
++++query.setParameter("username",+manager.getUsername());
++++query.setParameter("password",+manager.getPassword());
++++query.setParameter("id",+manager.getId());
++++query.executeUpdate();
}|code-block|syntax|javascript|9vk3v^0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|I|9|@]|A|@]|B|$]]|$2|C|4|D|6|E|8|J|9|@]|A|@]|B|$F|G]]|$2|H|4|-4|6|7|8|K|9|@]|A|@]|B|$]]]]

You can write custom update query which updates only particular fields:

<pre><code>@Override
public void saveManager(Manager manager) { 
 Query query = sessionFactory.getCurrentSession().createQuery("update Manager set username = :username, password = :password where id = :id");
 query.setParameter("username", manager.getUsername());
 query.setParameter("password", manager.getPassword());
 query.setParameter("id", manager.getId());
 query.executeUpdate();
}
</code></pre>

entityMap|blocks|key|fuha0|text|首先，您需要知道您是在执行插入操作还是更新操作。Insert很简单。在更新时，使用get()检索实体。然后更新任何字段。在事务结束时，Hibernate将刷新更改并提交。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1f17i^0|0^^$0|$]|1|@$2|3|4|5|6|7|8|D|9|@]|A|@]|B|$]]|$2|C|4|-4|6|7|8|E|9|@]|A|@]|B|$]]]]

First, you need to know if you are doing an insert or an update. Insert is straightforward. On update, use get() to retrieve the entity. Then update whatever fields. At the end of the transaction, Hibernate will flush the changes and commit.

entityMap|blocks|key|b5b5d|text|如果你真的在使用补丁，那么你应该使用RequestMethod.PATCH，而不是RequestMethod.POST。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2fuon|补丁程序映射应包含可用于检索要打补丁的Manager对象的id。此外，它应该只包括您想要更改的字段。在您的示例中，您发送的是整个实体，因此您无法辨别实际正在更改的字段(+empty是指不使用此字段，还是实际上将其值更改为空)。|5fbkr|也许这样的实现就是您想要的？|76bfi|@RequestMapping(value+=+"/manager/{id}",+method+=+RequestMethod.PATCH)
public+@ResponseBody+void+saveManager(@PathVariable+Long+id,+@RequestBody+Map<Object,+Object>+fields)+{
++++Manager+manager+=+someServiceToLoadManager(id);
++++//+Map+key+is+field+name,+v+is+value
++++fields.forEach((k,+v)+->+{
+++++++//+use+reflection+to+get+field+k+on+manager+and+set+it+to+value+v
++++++++Field+field+=+ReflectionUtils.findField(Manager.class,+k);
++++++++field.setAccessible(true);
++++++++ReflectionUtils.setField(field,+manager,+v);
++++});
++++managerService.saveManager(manager);
}|code-block|syntax|javascript|8v1ih^0|0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|M|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|N|9|@]|A|@]|B|$]]|$2|E|4|F|6|7|8|O|9|@]|A|@]|B|$]]|$2|G|4|H|6|I|8|P|9|@]|A|@]|B|$J|K]]|$2|L|4|-4|6|7|8|Q|9|@]|A|@]|B|$]]]]

If you are truly using a PATCH, then you should use RequestMethod.PATCH, not RequestMethod.POST.
Your patch mapping should contain the id with which you can retrieve the Manager object to be patched. Also, it should only include the fields with which you want to change. In your example you are sending the entire entity, so you can't discern the fields that are actually changing (does empty mean leave this field alone or actually change its value to empty).
Perhaps an implementation as such is what you're after?
<pre><code>@RequestMapping(value = &quot;/manager/{id}&quot;, method = RequestMethod.PATCH)
public @ResponseBody void saveManager(@PathVariable Long id, @RequestBody Map&lt;Object, Object&gt; fields) {
 Manager manager = someServiceToLoadManager(id);
 // Map key is field name, v is value
 fields.forEach((k, v) -&gt; {
 // use reflection to get field k on manager and set it to value v
 Field field = ReflectionUtils.findField(Manager.class, k);
 field.setAccessible(true);
 ReflectionUtils.setField(field, manager, v);
 });
 managerService.saveManager(manager);
}
</code></pre>

entityMap|blocks|key|38rb5|text|有了这个，您就可以修补您的更改|type|unstyled|depth|inlineStyleRanges|entityRanges|data|anusj|1.+Autowire+`ObjectMapper`+in+controller;

2.+@PatchMapping("/manager/{id}")
++++ResponseEntity<?>+saveManager(@RequestBody+Map<String,+String>+manager)+{
++++++++Manager+toBePatchedManager+=+objectMapper.convertValue(manager,+Manager.class);
++++++++managerService.patch(toBePatchedManager);
++++}

3.+Create+new+method+`patch`+in+`ManagerService`

4.+Autowire+`NullAwareBeanUtilsBean`+in+`ManagerService`

5.+public+void+patch(Manager+toBePatched)+{
++++++++Optional<Manager>+optionalManager+=+managerRepository.findOne(toBePatched.getId());
++++++++if+(optionalManager.isPresent())+{
++++++++++++Manager+fromDb+=+optionalManager.get();
++++++++++++//+bean+utils+will+copy+non+null+values+from+toBePatched+to+fromDb+manager.
++++++++++++beanUtils.copyProperties(fromDb,+toBePatched);
++++++++++++updateManager(fromDb);
++++++++}
++++}|code-block|syntax|javascript|3ebid|你将不得不扩展BeanUtilsBean来实现非空值行为的复制。|offset|length|style|CODE|9kptk|public+class+NullAwareBeanUtilsBean+extends+BeanUtilsBean+{

++++@Override
++++public+void+copyProperty(Object+dest,+String+name,+Object+value)
++++++++++++throws+IllegalAccessException,+InvocationTargetException+{
++++++++if+(value+==+null)
++++++++++++return;
++++++++super.copyProperty(dest,+name,+value);
++++}
}|bicol|最后，将NullAwareBeanUtilsBean标记为@Component|56n3d|或者|70tln|将NullAwareBeanUtilsBean注册为bean|8839b|@Bean
public+NullAwareBeanUtilsBean+nullAwareBeanUtilsBean()+{
++++return+new+NullAwareBeanUtilsBean();
}|6gp8t^0|0|0|7|D|0|0|T|A|0|0|1|M|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|Y|9|@]|A|@]|B|$]]|$2|C|4|D|6|E|8|Z|9|@]|A|@]|B|$F|G]]|$2|H|4|I|6|7|8|10|9|@$J|11|K|12|L|M]]|A|@]|B|$]]|$2|N|4|O|6|E|8|13|9|@]|A|@]|B|$F|G]]|$2|P|4|Q|6|7|8|14|9|@$J|15|K|16|L|M]]|A|@]|B|$]]|$2|R|4|S|6|7|8|17|9|@]|A|@]|B|$]]|$2|T|4|U|6|7|8|18|9|@$J|19|K|1A|L|M]]|A|@]|B|$]]|$2|V|4|W|6|E|8|1B|9|@]|A|@]|B|$F|G]]|$2|X|4|-4|6|7|8|1C|9|@]|A|@]|B|$]]]]

With this, you can patch your changes

<pre><code>1. Autowire `ObjectMapper` in controller;

2. @PatchMapping("/manager/{id}")
 ResponseEntity&lt;?&gt; saveManager(@RequestBody Map&lt;String, String&gt; manager) {
 Manager toBePatchedManager = objectMapper.convertValue(manager, Manager.class);
 managerService.patch(toBePatchedManager);
 }

3. Create new method `patch` in `ManagerService`

4. Autowire `NullAwareBeanUtilsBean` in `ManagerService`

5. public void patch(Manager toBePatched) {
 Optional&lt;Manager&gt; optionalManager = managerRepository.findOne(toBePatched.getId());
 if (optionalManager.isPresent()) {
 Manager fromDb = optionalManager.get();
 // bean utils will copy non null values from toBePatched to fromDb manager.
 beanUtils.copyProperties(fromDb, toBePatched);
 updateManager(fromDb);
 }
 }
</code></pre>

You will have to extend <code>BeanUtilsBean</code> to implement copying of non null values behaviour.

<pre><code>public class NullAwareBeanUtilsBean extends BeanUtilsBean {

 @Override
 public void copyProperty(Object dest, String name, Object value)
 throws IllegalAccessException, InvocationTargetException {
 if (value == null)
 return;
 super.copyProperty(dest, name, value);
 }
}
</code></pre>

and finally, mark NullAwareBeanUtilsBean as <code>@Component</code>

or 

register <code>NullAwareBeanUtilsBean</code> as bean

<pre><code>@Bean
public NullAwareBeanUtilsBean nullAwareBeanUtilsBean() {
 return new NullAwareBeanUtilsBean();
}
</code></pre>

entityMap|blocks|key|emsl|text|ObjectMapper.updateValue提供了将实体与dto中的值进行部分映射所需的全部内容。作为补充，您可以在此处使用以下两种方法之一：Map<String,+Object>+fields或String+json，因此您的服务方法可能如下所示：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1hd1d|@Autowired
private+ObjectMapper+objectMapper;

@Override
@Transactional
public+Foo+save(long+id,+Map<String,+Object>+fields)+throws+JsonMappingException+{
++++Foo+foo+=+fooRepository.findById(id)
++++.orElseThrow(()+->+new+ResourceNotFoundException("Foo+not+found+for+this+id:+"+%2B+id));

++++return+objectMapper.updateValue(foo+,+fields);
}|code-block|syntax|javascript|a7g2u|作为Lane+Maxwell答案的第二个解决方案和补充，您可以使用Reflection仅映射已发送的值映射中存在的属性，因此您的服务方法可能如下所示：|6tu4f|@Override
@Transactional
public+Foo+save(long+id,+Map<String,+Object>+fields)+{

++++Foo+foo+=+fooRepository.findById(id)
++++.orElseThrow(()+->+new+ResourceNotFoundException("Foo+not+found+for+this+id:+"+%2B+id));

++++fields.keySet()
++++++++++++.forEach(k+->+{
++++++++++++++++Method+method+=+ReflectionUtils.findMethod(LocationProduct.class,+"set"+%2B+StringUtils.capitalize(k));
++++++++++++++++if+(method+!=+null)+{
++++++++++++++++++++ReflectionUtils.invokeMethod(method,+foo,+fields.get(k));
++++++++++++++++}
++++++++++++});
++++return+foo;
}|cudme|第二个解决方案允许您在映射过程中插入一些额外的业务逻辑，可能是转换或计算等。|64jkf|此外，与通过名称查找反射字段Field+field+=+ReflectionUtils.findField(Foo.class,+k);并使其可访问不同，查找属性的setter实际上调用了setter方法，该方法可能包含要执行的额外逻辑，并防止将值设置为私有属性。|38tk7^0|0|O|21|Q|2S|B|0|0|X|A|0|0|0|E|1I|0^^$0|$]|1|@$2|3|4|5|6|7|8|U|9|@$A|V|B|W|C|D]|$A|X|B|Y|C|D]|$A|Z|B|10|C|D]]|E|@]|F|$]]|$2|G|4|H|6|I|8|11|9|@]|E|@]|F|$J|K]]|$2|L|4|M|6|7|8|12|9|@$A|13|B|14|C|D]]|E|@]|F|$]]|$2|N|4|O|6|I|8|15|9|@]|E|@]|F|$J|K]]|$2|P|4|Q|6|7|8|16|9|@]|E|@]|F|$]]|$2|R|4|S|6|7|8|17|9|@$A|18|B|19|C|D]]|E|@]|F|$]]|$2|T|4|-4|6|7|8|1A|9|@]|E|@]|F|$]]]]

<code>ObjectMapper.updateValue</code> provides all you need to partially map your entity with values from dto.
As an addition, you can use either of two here: <code>Map&lt;String, Object&gt; fields</code> or <code>String json</code>, so your service method may look like this:
<pre><code>@Autowired
private ObjectMapper objectMapper;

@Override
@Transactional
public Foo save(long id, Map&lt;String, Object&gt; fields) throws JsonMappingException {
 Foo foo = fooRepository.findById(id)
 .orElseThrow(() -&gt; new ResourceNotFoundException(&quot;Foo not found for this id: &quot; + id));

 return objectMapper.updateValue(foo , fields);
}
</code></pre>
As a second solution and addition to Lane Maxwell's answer you could use <code>Reflection</code> to map only properties that exist in a Map of values that was sent, so your service method may look like this:
<pre><code>@Override
@Transactional
public Foo save(long id, Map&lt;String, Object&gt; fields) {

 Foo foo = fooRepository.findById(id)
 .orElseThrow(() -&gt; new ResourceNotFoundException(&quot;Foo not found for this id: &quot; + id));

 fields.keySet()
 .forEach(k -&gt; {
 Method method = ReflectionUtils.findMethod(LocationProduct.class, &quot;set&quot; + StringUtils.capitalize(k));
 if (method != null) {
 ReflectionUtils.invokeMethod(method, foo, fields.get(k));
 }
 });
 return foo;
}
</code></pre>
Second solution allows you to insert some additional business logic into mapping process, might be conversions or calculations ect.
Also unlike finding reflection field <code>Field field = ReflectionUtils.findField(Foo.class, k);</code> by name and than making it accessible, finding property's setter actually calls setter method that might contain additional logic to be executed and prevents from setting value to private properties.

I'm trying to implement a partial update of the Manager entity based in the following:

Entity

<pre><code>public class Manager {
 private int id;
 private String firstname;
 private String lastname;
 private String username;
 private String password;

 // getters and setters omitted
}
</code></pre>

SaveManager method in Controller

<pre><code>@RequestMapping(value = "/save", method = RequestMethod.PATCH)
public @ResponseBody void saveManager(@RequestBody Manager manager){
 managerService.saveManager(manager);
}
</code></pre>

Save object manager in Dao impl.

<pre><code>@Override
public void saveManager(Manager manager) { 
 sessionFactory.getCurrentSession().saveOrUpdate(manager);
}
</code></pre>

When I save the object the username and password has changed correctly but the others values are empty.

So what I need to do is update the username and password and keep all the remaining data.

Spring REST partial update with @PATCH method

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

文章

问答

视频

学习中心

腾讯云实验室

直播

竞赛

腾讯云架构师技术同盟交流圈

腾讯云数据库专区

腾讯云顾问专区

腾讯云原生专区

腾讯混元专区

腾讯云TCE专区

腾讯云Lighthouse专区

腾讯云HAI专区

腾讯云Edgeone专区

腾讯云存储专区

腾讯云智能专区

腾讯轻联专区 

腾讯云开发专区

TAPD专区

腾讯轻量云游戏服专区

腾讯云最具价值专家

腾讯云架构师技术同盟

腾讯云创作之星

腾讯云开发者先锋 

腾讯云代码助手

CODING DevOps

Cloud Studio

SDK中心

API中心

命令行工具

 我正在尝试基于以下内容实现Manager实体的部分更新： 实体 public class Manager {    private int id;    private String firstname;    private String lastname;    private String username; ...

问使用@PATCH方法进行Spring REST部分更新
EN

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问使用@PATCH方法进行Spring REST部分更新EN