java – Hibernate多租户在运行时创建模式

我正在使用hibernate 4和spring 4为java Web应用程序设置多租户支持.在应用程序启动时创建并设置默认架构.不尝试支持多租户时,此架构可正常工作.

我现在需要做的是为每个创建帐户的新租户创建一个模式.此架构可以只是通用架构的副本,因为它将遵循相同的格式.

如何在运行时创建与默认模式相同格式的新模式？似乎在实例化LocalSessionFactoryBean时创建了默认模式,因为这是我指定映射资源的地方.

解决方法:

我想出了一个解决我问题的解决方案.我希望对那里的人有用.

因此,主要问题归结为Hibernate在多租户配置期间在运行时为新客户端创建架构的限制.

“Hibernate does not support automatic schema export in a multi-tenancy environment.”

我解决这个限制(使用Spring)的解决方案是创建一个新的LocalSessionFactoryBean,配置为不支持多租户.
所以基本上我有两个LocalSessionFactoryBeans.

>多租户LocalSessionFactoryBean,用于多租户会话
>非多租户LocalSessionFactoryBean,用于使用spring文件中的配置集为租户创建架构.

弹簧配置

<!-- Multi-tenant SessionFactory -->
<bean id="sessionFactory"
    class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
    <property name="dataSource" ref="dataSource" />
    <property name="hibernateProperties">
        <map>
            <entry key="hibernate.dialect" value="${hibernate.dialect}" />
            <entry key="hibernate.hbm2ddl.auto" value="NONE" />
            <!-- Multi-tenancy support -->
            <entry key="hibernate.multiTenancy" value="SCHEMA" />
            <entry key="hibernate.tenant_identifier_resolver" value="${hibernate.tenant_identifier_resolver}" />
            <entry key="hibernate.multi_tenant_connection_provider" value-ref="multiTenantConnectionProvider" />
        </map>
    </property>
    <property name="mappingResources">
        <list>
            <COMMON SCHEMA MAPPING RESOURCES />
        </list>
    </property>
</bean>

<!-- SessionFactory capable of managing multi-tenant schemas -->
<bean id="sessionFactorySchemaManager"
    class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
    <property name="dataSource" ref="dataSource" />
    <property name="hibernateProperties">
        <map>
            <entry key="hibernate.dialect" value="${hibernate.dialect}" />
            <entry key="hibernate.hbm2ddl.auto" value="CREATE" />
            <!-- Multi-tenancy support -->
            <entry key="hibernate.multiTenancy" value="NONE" />
        </map>
    </property>
    <property name="mappingResources">
        <list>
            <TENANT SPECIFIC SCHEMA MAPPING RESOURCES />
        </list>
    </property>
</bean>

用于创建架构的代码

public boolean createSchema(final String tenantId) throws SQLException {
    boolean result = false;

    if(_configuration != null && _dataSource != null) {

        // Get a local configuration to configure
        final Configuration tenantConfig = _configuration;

        // Set the properties for this configuration
        Properties props = new Properties();
        props.put(Environment.DEFAULT_SCHEMA, tenantId);
        tenantConfig.addProperties(props);

        // Get connection
        Connection connection = DriverManager.getConnection(_dataSource.getUrl(), 
                _dataSource.getUsername(), _dataSource.getPassword());

        // Create the schema
        connection.createStatement().execute("CREATE SCHEMA " + tenantId + "");

        // Run the schema update from configuration
        SchemaUpdate schemaUpdate = new SchemaUpdate(tenantConfig);
        schemaUpdate.execute(true, true);

        // Set the schema
        connection.createStatement().execute("SET SCHEMA " + tenantId + "");

        // Set the result
        result = true;

    } else if(_configuration == null) {
        if(_LOGGER.isWarnEnabled()) {
            _LOGGER.warn("No configuration was specified for " + getClass().getSimpleName());
        }
    } else if(_dataSource == null) {
        if(_LOGGER.isWarnEnabled()) {
            _LOGGER.warn("No dataSource was specified for " + getClass().getSimpleName());
        }
    }

    return result;
}

请注意,此代码中的_configuration来自Non Multi-Tenant LocalSessionFactoryBean

标签：java,spring,hibernate,multi-tenant
来源： https://codeday.me/bug/20191004/1853864.html