Spring 多个@Transactional 数据源 [英] Spring multiple @Transactional datasources

问题描述

<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
    <property name="entityManagerFactory" ref="data.emf" />
</bean>

<tx:annotation-driven transaction-manager="transactionManager" />


<bean id="transactionManager2" class="org.springframework.orm.jpa.JpaTransactionManager">
    <property name="entityManagerFactory" ref="data.emf" />
</bean>

<tx:annotation-driven transaction-manager="transactionManager2" />

在我的服务层，如果我有多个事务管理器，我可以使用 @Transactional(name="transactionManager2"); 来标识我使用哪个事务管理器吗?

In my service layer, can I use @Transactional(name="transactionManager2"); to identify which transaction manager I use if I have multiple transaction managers?

推荐答案

您可以使用 value 属性:

You can specify which tx manager to use with @Transactional using the value attribute:

指定的限定符值交易.

可用于确定目标事务管理器，匹配的限定符值(或 bean 名称)一个特定的 PlatformTransactionManagerbean定义.

May be used to determine the target transaction manager, matching the qualifier value (or the bean name) of a specific PlatformTransactionManager bean definition.

例如:

@Transactional("txManager1");

或者，您可以使用更明确的 TransactionProxyFactoryBean，它可以让您更精细地控制哪些对象由哪些 tx 管理器代理.这仍然使用注释，但它不会自动检测 bean，它是在一个 bean-by-bean 的基础上显式配置的.

Alternatively, you can use the more explicit TransactionProxyFactoryBean, which gives you finer-grained control over what objects gets proxied by what tx managers. This still uses the annotations, but it doesn't auto-detect beans, it's configured explicitly on a bean-by-bean basis.

这通常不是问题，但拥有多个事务管理器并不明智，除非您有充分的理由这样做.如果您发现自己需要两个 tx 管理器，通常最好看看是否可以凑合使用一个.例如，如果您在应用服务器中配置了两个数据源，您可以将两者合并到一个 JtaTransactionManager 中，而不是两个单独的 JpaTransactionManager 或 DataSourceTransactionmanagers.

This normally isn't an issue, but it's not wise to have multiple transaction managers unless you have a very good reason to do so. If you find yourself needing two tx managers, it's usually better to see if you can make do with one. For example, if you have two data sources configured in your app server, you can incorporate both in a single JtaTransactionManager, rather than two seperate JpaTransactionManager or DataSourceTransactionmanagers.

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