如何使用spring JPA在同一事務中的不同數據庫上維護多個sql查詢

Question

我有2個數據庫的實體和存儲庫設置

persistence.xml

<persistence-unit name="user_per_unit" transaction-type="RESOURCE_LOCAL">
    <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
    <class>com.example.User</class>
    <class>com.example.Order</class>
    <class>com.example.Package</class>
    <exclude-unlisted-classes>true</exclude-unlisted-classes>
    <properties>
        <property name="hibernate.show_sql" value="true" />
        <property name="hibernate.format_sql" value="false" />
        <property name="hibernate.hbm2ddl.auto" value="validate" />
        <property name="hibernate.jdbc.batch_size" value="100" />
        <property name="hibernate.order_inserts" value="true" />
        <property name="hibernate.order_updates" value="true" />
        <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect" />
    </properties>
</persistence-unit>

<persistence-unit name="stock_per_unit" transaction-type="RESOURCE_LOCAL">
    <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
    <class>com.example.Stock</class>
    <class>com.example.Graph</class>
    <class>com.example.Change</class>
    <exclude-unlisted-classes>true</exclude-unlisted-classes>
    <properties>
        <property name="hibernate.show_sql" value="true" />
        <property name="hibernate.format_sql" value="false" />
        <property name="hibernate.hbm2ddl.auto" value="validate" />
        <property name="hibernate.jdbc.batch_size" value="100" />
        <property name="hibernate.order_inserts" value="true" />
        <property name="hibernate.order_updates" value="true" />
        <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect" />
    </properties>
</persistence-unit>

並在applicationContext.xml

<jpa:repositories base-package="com.example.user.repository" entity-manager-factory-ref="userEntityManagerFactory" transaction-manager-ref="userTransactionManager"/>

<bean id="userEntityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="persistenceUnitName"    value="user_per_unit" />
    <property name="dataSource"             ref="userDataSource" />
    <property name="jpaVendorAdapter"       ref="jpaVendorAdapter" />
    <property name="jpaProperties">
        <props>
            <prop key="hibernate.show_sql">true</prop>
            <prop key="hibernate.format_sql">false</prop>
        </props>
    </property>
</bean>

<bean id="userTransactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
    <property name="entityManagerFactory" ref="userEntityManagerFactory" />
</bean>

<bean id="userDataSource" class="org.apache.commons.dbcp2.BasicDataSource">
    <property name="driverClassName" value="${driver}" />
    <property name="url" value="${url}" />
    <property name="username" value="${username}" />
    <property name="password" value="${password}" />
    <property name="initialSize" value="${size}" />
    <property name="maxTotal" value="${maxtotal}" />
    <property name="maxIdle" value="${maxidle}" />
    <property name="minIdle" value="${minidle}" />
</bean>

<jpa:repositories base-package="com.example.stock.repository" entity-manager-factory-ref="stockEntityManagerFactory" transaction-manager-ref="stockTransactionManager"/>

<bean id="stockEntityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="persistenceUnitName"    value="stock_per_unit" />
    <property name="dataSource"             ref="stockDataSource" />
    <property name="jpaVendorAdapter"       ref="jpaVendorAdapter" />
    <property name="jpaProperties">
        <props>
            <prop key="hibernate.show_sql">true</prop>
            <prop key="hibernate.format_sql">false</prop>
        </props>
    </property>
</bean>

<bean id="stockTransactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
    <property name="entityManagerFactory" ref="stockEntityManagerFactory" />
</bean>

<bean id="stockDataSource" class="org.apache.commons.dbcp2.BasicDataSource">
    <property name="driverClassName" value="${driver}" />
    <property name="url" value="${url}" />
    <property name="username" value="${username}" />
    <property name="password" value="${password}" />
    <property name="initialSize" value="${size}" />
    <property name="maxTotal" value="${maxtotal}" />
    <property name="maxIdle" value="${maxidle}" />
    <property name="minIdle" value="${minidle}" />
</bean>

現在在我的課堂上，我正在用類似的方法做幾個CURD操作

userRepository.updateUser(...);

userRepository.addUser(...);

userRepository.deleteUser(...);

stockRepository.updateUser(...);

stockRepository.addUser(...);

stockRepository.deleteUser(...);

如何在頂部啟動事務，如果在此過程中出現故障，請在啟動方法之前恢復到原始狀態。

Answer 1

我使用ChainesTransactionManager來實現這一點

applicationContext.xml

<bean id="chainedTxManager" class="org.springframework.data.transaction.ChainedTransactionManager">
    <constructor-arg>
        <list>
            <ref bean="userTransactionManager"/>
            <ref bean="stockTransactionManager"/>
        </list>
    </constructor-arg>
</bean>

並在我的班級上使用注釋

@Transactional(value = "chainedTxManager")

當任何數據庫的任何查詢失敗時，我拋出一個異常並自動回滾，如果沒有異常，則提交它。