Spring、JSR 303验证和Hibernate

Question

我目前正在用Spring开发一个应用程序，使用Hibernate作为ORM。我知道，默认情况下，Hibernate在持久化或加载实体时都会使用JSR-303 Bean验证。由于此应用程序支持草稿（我希望在持久化后执行验证），因此必须将其添加到persistence.xml中：

<validation-mode>NONE</validation-mode>

@RequestMapping(value = "/entity/{entity_id}", method = RequestMethod.POST)
public String completeEntity(@PathVariable("entity_id") Long entity_id)
{
    //myEntityService was autowired in the controller
    MyEntity myEntity = myEntityService.findById(entity_id);
    //Here comes the bean validation
    DataBinder binder = new DataBinder(myEntity);
    //validator was also autowired
    binder.setValidator(validator);
    binder.validate();
    BindingResult result = binder.getBindingResult();
    if (result.hasErrors()) {
        //handleErrors
    }
    //continue doing stuff, marking the entity as 'not draft' and persisting it...
}

模型实体代码：

@Entity
@Table(name = "myEntity")
public class MyEntity{
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @NotBlank 
    String foo;

    // bi-directional one-to-many association to Bar
    //Note the valid annotation, as i want all related Bar's to be validated
    //when a MyEntity is validated
    @Valid
    @OneToMany(mappedBy = "myEntity")
    private List<Bar> bars;

    //Getters and Setters...
}

@Entity
@Table(name = "bar")
public class Bar{
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @NotBlank 
    String barFoo;

    // bi-directional many-to-one association to MyEntity
    @ManyToOne
    private MyEntity myEntity;

    //Getters and Setters...
}

我想知道如何传播bean验证，以便每当MyEntity实例被验证时，所有相关联的bar也被验证，而不必在验证之前强制加载这些实体。

Answer 1

您可以实现一个自定义的可遍历解析器，并配置Bean验证来使用这个解析器。

默认实现确保没有从数据库加载对象（假设它们在上次写入时已经成功验证），但您可以根据需求重写特定关联。