hibernate 5和spring - 使用SchemaExport生成ddl

Question

在hibernate 4 - spring 4 setup中,可以使用SchemaExportobject 生成DDL :

LocalSessionFactoryBean sfb = (LocalSessionFactoryBean) context.getBean("&sessionFactory");
SchemaExport schema = new SchemaExport(sfb.getConfiguration());  

但是hibernate 5替换了SchemaExport(Configuration configuration)构造函数SchemaExport(MetadataImplementator metadataImplementator).

MetadataImplementator并非随时可用

org.springframework.orm.hibernate5.LocalSessionFactoryBean 要么 org.springframework.orm.hibernate5.LocalSessionFactoryBuilder

我这样砍了它:

MetadataSources metadataSources = (MetadataSources) FieldUtils.readField(configuration, "metadataSources", true);


Metadata metadata = metadataSources
    .getMetadataBuilder(configuration.getStandardServiceRegistryBuilder().build())
    .applyPhysicalNamingStrategy(new MyPhysicialNamingStrategy())
    .applyImplicitNamingStrategy(ImplicitNamingStrategyJpaCompliantImpl.INSTANCE)
    .build();

MetadataImplementor metadataImpl = (MetadataImplementor) metadata;
SchemaExport schema = new SchemaExport(metadataImplementor);

但是有一个更好的方法会很好,而且Validator注释(@NotNull,@ Size)不用于DDL生成,我不知道它是否是Hibernate 5或此设置中的错误.

我正在使用hibernate 5.0.0.CR4和spring 4.2.0.RELEASE

Answer 1

您需要实现org.hibernate.integrator.spi.Integrator可以将所需数据存储到某个持有者的位置。

您可以在这里找到工作示例https://github.com/valery-barysok/spring4-hibernate5-stackoverflow-34612019

META-INF/services/org.hibernate.integrator.spi.Integrator将其注册为文件中的服务

public class Integrator implements org.hibernate.integrator.spi.Integrator {

    @Override
    public void integrate(Metadata metadata, SessionFactoryImplementor sessionFactory, SessionFactoryServiceRegistry serviceRegistry) {
        HibernateInfoHolder.setMetadata(metadata);
        HibernateInfoHolder.setSessionFactory(sessionFactory);
        HibernateInfoHolder.setServiceRegistry(serviceRegistry);
    }

    @Override
    public void disintegrate(SessionFactoryImplementor sessionFactory, SessionFactoryServiceRegistry serviceRegistry) {
    }
}

用它

    new SchemaExport((MetadataImplementor) HibernateInfoHolder.getMetadata()).create(true, true);
    new SchemaUpdate(HibernateInfoHolder.getServiceRegistry(), (MetadataImplementor) HibernateInfoHolder.getMetadata()).execute(true, true);

您可以在此处找到更多信息：使用 Hibernate 5 和 Spring 4 进行编程 SchemaExport / SchemaUpdate

Java Persistence API有Configuration over Convention其原则，但 Validation API 仅用于验证目的。验证不是绝对的，您可以在同一字段上放置不同的验证规则。

例如，如果你有

@Size(max = 50)
@NotNull(groups = DefaultGroup.class)
@Null(groups = SecondGroup.class)
private String shortTitle;

那么它被解释为

@Size(max = 50)
@NotNull(groups = DefaultGroup.class)
@Null(groups = SecondGroup.class)
@Column(length = 255, nullable = true)
private String shortTitle;

请在此处查看更多详细信息 为什么 Hibernate Tools hbm2ddl 生成不考虑 Bean Validation 注释？