Question

我正在使用具有多个架构的单个数据库来构建Multitenant saas应用程序；每个客户端一个模式。我正在使用Spring Boot 2.1.5，Hibernate 5.3.10和兼容的spring数据jpa和postgres 11.2。

我关注了此博客文章https://dzone.com/articles/spring-boot-hibernate-multitenancy-implementation。

尝试调试代码，以下是我的发现：
*对于数据源配置中提供的默认架构，hibernate会正确验证架构。它在默认架构中创建丢失的表或实体或创建新的表/实体。
*租户标识符已正确解析，休眠使用该租户建立会话。

我已将代码上传到以下仓库中：

https://github.com/naveentulsi/multitenant-lithium

我在这里添加了一些重要的课程。

    @Component
    @Log4j2
    public class MultiTenantConnectionProviderImpl implements 
       MultiTenantConnectionProvider {

    @Autowired
    DataSource dataSource;

    @Override
    public Connection getAnyConnection() throws SQLException {
        return dataSource.getConnection();
    }

    @Override
    public void releaseAnyConnection(Connection connection) throws SQLException {
        connection.close();
    }

    @Override
    public Connection getConnection(String tenantIdentifier) throws SQLException {
        final Connection connection = getAnyConnection();
        try {
            if (!StringUtils.isEmpty(tenantIdentifier)) {
                String setTenantQuery = String.format(AppConstants.SCHEMA_CHANGE_QUERY, tenantIdentifier);
                connection.createStatement().execute(setTenantQuery);
                final ResultSet resultSet = connection.createStatement().executeQuery("select current_schema()");
                if(resultSet != null){
                    final String string = resultSet.getString(1);
                    log.info("Current Schema" + string);
                }
                System.out.println("Statement execution");
            } else {
                connection.createStatement().execute(String.format(AppConstants.SCHEMA_CHANGE_QUERY, AppConstants.DEFAULT_SCHEMA));
            }
        } catch (SQLException se) {
            throw new HibernateException(
                    "Could not change schema for connection [" + tenantIdentifier + "]",
                    se
            );
        }
        return connection;
    }

    @Override
    public void releaseConnection(String tenantIdentifier, Connection connection) throws SQLException {
        try {
            String Query = String.format(AppConstants.DEFAULT_SCHEMA, tenantIdentifier);
            connection.createStatement().executeQuery(Query);
        } catch (SQLException se) {
            throw new HibernateException(
                    "Could not change schema for connection [" + tenantIdentifier + "]",
                    se
            );
        }
        connection.close();
    }

    @Override
    public boolean supportsAggressiveRelease() {
        return true;
    }

    @Override
    public boolean isUnwrappableAs(Class unwrapType) {
        return false;
    }

    @Override
    public <T> T unwrap(Class<T> unwrapType) {
        return null;
    }
}

@Configuration
@EnableJpaRepositories
public class ApplicationConfiguration implements WebMvcConfigurer {

    @Autowired
    JpaProperties jpaProperties;

    @Autowired
    TenantInterceptor tenantInterceptor;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(tenantInterceptor);
    }


    @Bean
    public DataSource dataSource() {
        return DataSourceBuilder.create().username(AppConstants.USERNAME).password(AppConstants.PASS)
                .url(AppConstants.URL)
                .driverClassName("org.postgresql.Driver").build();
    }

    @Bean
    public JpaVendorAdapter jpaVendorAdapter() {
        return new HibernateJpaVendorAdapter();
    }

    @Bean
    public LocalContainerEntityManagerFactoryBean entityManagerFactory(DataSource dataSource, MultiTenantConnectionProviderImpl multiTenantConnectionProviderImpl, CurrentTenantIdentifierResolver currentTenantIdentifierResolver) {
        Map<String, Object> properties = new HashMap<>();

        properties.put("hibernate.dialect", "org.hibernate.dialect.PostgreSQLDialect");
        properties.put("hibernate.hbm2ddl.auto", "update");
        properties.put("hibernate.ddl-auto", "update");
        properties.put("hibernate.jdbc.lob.non_contextual_creation", "true");
        properties.put("show-sql", "true");
        properties.put("hikari.maximum-pool-size", "3");
        properties.put("hibernate.default_schema", "master");
        properties.put("maximum-pool-size", "2");

        if (dataSource instanceof HikariDataSource) {
            ((HikariDataSource) dataSource).setMaximumPoolSize(3);
        }

        properties.put(Environment.MULTI_TENANT, MultiTenancyStrategy.SCHEMA);
        properties.put(Environment.MULTI_TENANT_CONNECTION_PROVIDER, multiTenantConnectionProviderImpl);
        properties.put(Environment.MULTI_TENANT_IDENTIFIER_RESOLVER, currentTenantIdentifierResolver);
        properties.put(Environment.FORMAT_SQL, true);


        LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
        em.setDataSource(dataSource);

        em.setPackagesToScan("com.saas");
        em.setJpaVendorAdapter(jpaVendorAdapter());
        em.setJpaPropertyMap(properties);

        return em;
    }
}

@Component
public class TenantResolver implements CurrentTenantIdentifierResolver {


    private static final ThreadLocal<String> TENANT_IDENTIFIER = new ThreadLocal<>();

    public static void setTenantIdentifier(String tenantIdentifier) {
        TENANT_IDENTIFIER.set(tenantIdentifier);
    }

    public static void reset() {
        TENANT_IDENTIFIER.remove();
    }

    @Override
    public String resolveCurrentTenantIdentifier() {
        String currentTenant = TENANT_IDENTIFIER.get() != null ? TENANT_IDENTIFIER.get() : AppConstants.DEFAULT_SCHEMA;
        return currentTenant;
    }

    @Override
    public boolean validateExistingCurrentSessions() {
        return true;
    }
}

由TenantResolver成功注入TenantId后，entityManager应该能够将实体存储到数据库中相应的租户架构中。也就是说，如果我们创建实体的对象并将其持久保存在db中，则应成功将其保存在db中。但就我而言，实体不会保存到默认模式以外的任何模式中。

更新1：我能够使用mysql 8.0.12进行多租户架构切换。仍然无法使用postgres做到这一点。

Answer 1

您应该使用AbstractRoutingDataSource来实现这一目标，它可以完成所有幕后工作，在线上有很多示例，您可以在https://www.baeldung.com/spring-abstract-routing-data-source上找到一个示例

Answer 2

在您的类“ ApplicationConfiguration.java”中；

您必须删除此“ properties.put（” hibernate.default_schema“，” master“）;”，为什么因为每次更改架构时它都可以更改，但是当它到达此行时又一次设置默认架构

希望你能得到答案

谢谢大家

保重！

Spring Boot + Hibernate + JPA + Postgres多租户应用无法持久保存实体

2 个答案: