java - 使用 Hibernate 5 和 Spring 4 的程序化 SchemaExport/SchemaUpdate

Question

使用 Spring 4 和 Hibernate 4，我能够使用反射从当前环境中获取 Hibernate 配置对象，使用以下代码:

@Autowired LocalContainerEntityManagerFactoryBean lcemfb;

EntityManagerFactoryImpl emf = (EntityManagerFactoryImpl) lcemfb.getNativeEntityManagerFactory();
SessionFactoryImpl sf = emf.getSessionFactory();
SessionFactoryServiceRegistryImpl serviceRegistry = (SessionFactoryServiceRegistryImpl) sf.getServiceRegistry();
Configuration cfg = null;

try {
    Field field = SessionFactoryServiceRegistryImpl.class.getDeclaredField("configuration");
    field.setAccessible(true);
    cfg = (Configuration) field.get(serviceRegistry);
} catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException e) {
    e.printStackTrace();
}

SchemaUpdate update = new SchemaUpdate(serviceRegistry, cfg);

在 Hibernate 5 中，我必须使用一些 MetadataImplementor，这似乎不适用于任何这些对象。我还尝试将 MetadataSources 与 serviceRegistry 一起使用。但它确实说这是错误的 ServiceRegistry。

还有其他方法可以让这个工作吗？

Answer 1

这个问题的基本思路是:

org.hibernate.integrator.spi.Integrator 的实现，它将所需的数据存储到某个持有者。将实现注册为服务并在需要的地方使用它。

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

---

创建org.hibernate.integrator.api.integrator.Integrator类

import hello.HibernateInfoHolder;
import org.hibernate.boot.Metadata;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.service.spi.SessionFactoryServiceRegistry;

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) {
    }
}

---

创建META-INF/services/org.hibernate.integrator.spi.Integrator文件

org.hibernate.integrator.api.integrator.Integrator

---

import org.hibernate.boot.spi.MetadataImplementor;
import org.hibernate.tool.hbm2ddl.SchemaExport;
import org.hibernate.tool.hbm2ddl.SchemaUpdate;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Application implements CommandLineRunner {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }

    @Override
    public void run(String... args) throws Exception {
        new SchemaExport((MetadataImplementor) HibernateInfoHolder.getMetadata()).create(true, true);
        new SchemaUpdate(HibernateInfoHolder.getServiceRegistry(), (MetadataImplementor) HibernateInfoHolder.getMetadata()).execute(true, true);
    }
}