使用休眠的多租户模式验证

Question

基于

的多租户应用程序如何工作

独立数据库：每个租户都有自己的数据库。;

是否进行架构验证？

hibernate.hbm2ddl.auto validate 正常使用，

如果动态添加新租户，是否可以进行架构验证？

Answer 1

试试看：

@ConditionalOnExpression("${multitenancy.enabled:true} and '${spring.jpa.hibernate.ddl-auto}'.equals('validate')")
@Component
public class DDLSchemaValidator implements ApplicationRunner {
    @Autowired
    private BeanFactory beanFactory;
    @PersistenceUnit
    private EntityManagerFactory emf;

    private String[] tenants = {"tenant-1", "tenant-2", "tenant-3", "tenant-4"};

    public void run(ApplicationArguments args) {
        PersistenceUnitInfo persistenceUnitInfo = this.getPersistenceUnitInfo();

        SessionFactoryImpl sessionFactory = this.emf.unwrap(SessionFactoryImpl.class);
        ServiceRegistry serviceRegistry = sessionFactory.getServiceRegistry().getParentServiceRegistry();

        MetadataSources metadataSources = new MetadataSources(serviceRegistry);
        List<String> managedClassNames = persistenceUnitInfo.getManagedClassNames();
        for (String managedClassName : managedClassNames) {
            metadataSources.addAnnotatedClassName(managedClassName);
        }

        for (String tenantId: this.tenants) {
            MetadataBuilder metadataBuilder = metadataSources.getMetadataBuilder();
            metadataBuilder.applyImplicitSchemaName(tenantId);
            new SchemaValidator().validate(metadataBuilder.build());
        }
    }

    private PersistenceUnitInfo getPersistenceUnitInfo() {
        List<String> packagesToScan = EntityScanPackages.get(this.beanFactory).getPackageNames();
        if (packagesToScan.isEmpty() && AutoConfigurationPackages.has(this.beanFactory)) {
            packagesToScan = AutoConfigurationPackages.get(this.beanFactory);
        }

        DefaultPersistenceUnitManager persistenceUnitManager = new DefaultPersistenceUnitManager();

        String[] packagesToScanArr = StringUtils.toStringArray(packagesToScan);
        persistenceUnitManager.setPackagesToScan(packagesToScanArr);
        persistenceUnitManager.afterPropertiesSet();

        return persistenceUnitManager.obtainDefaultPersistenceUnitInfo();
    }
}