我有2个实体 - 用户和角色@ManyToOne
。我想更改用户角色,但角色也希望更新。
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;
我得到的错误是:
java.lang.IllegalStateException:org.hibernate.TransientObjectException:object引用未保存的瞬态实例 - 在查询刷新之前保存瞬态实例:com.spring.model.Role 在org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:144) 在org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:155) 在org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:162) 在org.hibernate.internal.SessionImpl.doFlush(SessionImpl.java:1434)
我在DB中的表格未使用CASCADE UPDATE或INSERT设置。我无法找到合适的解决方案。谢谢你的帮助
编辑:
这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:
我的休眠配置
@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;
}
}
答案 0 :(得分:0)
您应该使用cascade
注释的OneToMany
属性,它与数据库cascade
操作没有任何关系(但可能会受到影响)。
@OneToMany(cascade = CascadeType.ALL, mappedBy="role", orphanRemoval = true)
private Set<User> users;
这样,操作将传播到集合元素。您可以查看this answer了解详情。
您还可以修改ManyToOne
注释的级联属性。
@ManyToOne(cascade = CascadeType.ALL)
@JoinColumn(name = "role_id")
private Role role;