Hibernate @manytoone不要更新表

Question

我有2个实体 - 用户和映射@ManyToOne的角色。我想更改用户中的角色，但是角色也希望更新。

用户实体：

@ManyToOne
@JoinColumn(name = "role_id", insertable =  false, updatable = false)
private Role role;

角色实体：

@OneToMany(mappedBy = "role")
private Set<User> users;

我遇到的错误是：

java.lang.illegalstateException：org.hibernate.transientObjectException：对象引用一个未保存的瞬态实例 - 在flushing之前保存瞬态实例：com.spring.model.role.role at org.hibernate.internal.exceptionConverterimpl.Convert(exceptionConverterimpl.java:144( at org.hibernate.internal.exceptionConverterimpl.Convert(exceptionConverterimpl.java:155( at org.hibernate.internal.exceptionConverterimpl.Convert(exceptionConverterimpl.java:162( atorg.hibernate.internal.sessionimpl.doflush(sessionimpl.java:1434(

我的DB中的表格没有设置为CASCADE UPDATE或INSERT。我找不到适当的解决方案。感谢您的帮助

编辑：

这就是我更新用户的方式

public void update(User user) {
        User entity = dao.findById(user.getId());
        if(entity!=null) {
            entity.setRole(user.getRole());
        }
    }

edit2：

我的冬眠配置

@Configuration
@EnableTransactionManagement
@ComponentScan({ "com.spring.configuration" })
@PropertySource(value = { "classpath:application.properties" })
public class HibernateConfiguration {
    @Autowired
    private Environment environment;
    @Bean
    public LocalSessionFactoryBean sessionFactory() {
        LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean();
        sessionFactory.setDataSource(dataSource());
        sessionFactory.setPackagesToScan(new String[] { "com.spring.model" });
        sessionFactory.setHibernateProperties(hibernateProperties());
        return sessionFactory;
     }
    @Bean
    public DataSource dataSource() {
        DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName(environment.getRequiredProperty("jdbc.driverClassName"));
        dataSource.setUrl(environment.getRequiredProperty("jdbc.url"));
        dataSource.setUsername(environment.getRequiredProperty("jdbc.username"));
        dataSource.setPassword(environment.getRequiredProperty("jdbc.password"));
        return dataSource;
    }
    private Properties hibernateProperties() {
        Properties properties = new Properties();
        properties.put("hibernate.dialect", environment.getRequiredProperty("hibernate.dialect"));
        properties.put("hibernate.show_sql", environment.getRequiredProperty("hibernate.show_sql"));
        properties.put("hibernate.format_sql", environment.getRequiredProperty("hibernate.format_sql"));
        return properties;        
    }
    @Bean
    @Autowired
    public HibernateTransactionManager transactionManager(SessionFactory s) {
       HibernateTransactionManager txManager = new HibernateTransactionManager();
       txManager.setSessionFactory(s);
       return txManager;
    }
}

Answer 1

您应该使用OneToMany注释的cascade属性，它与数据库cascade操作没有任何关系(但可能会受到该数据库的影响(。

@OneToMany(cascade = CascadeType.ALL, mappedBy="role", orphanRemoval = true)
private Set<User> users;

这样，操作将传播到收集元素。您可以检查此答案以获取更多信息。

您也可以修改ManyToOne注释的级联属性。

@ManyToOne(cascade = CascadeType.ALL)
@JoinColumn(name = "role_id")
private Role role;