Java Spring的上下文和Spring数据jpa
我正在处理一个导入模块,从excel文件中读取数据,填充实体并保存它们 现在我的问题是,我正在处理许多实体,然后我将数据库上的存储拆分为三种不同的方法 这是我的导入方法:Java Spring的上下文和Spring数据jpa,java,spring,jpa,spring-data-jpa,Java,Spring,Jpa,Spring Data Jpa,我正在处理一个导入模块,从excel文件中读取数据,填充实体并保存它们 现在我的问题是,我正在处理许多实体,然后我将数据库上的存储拆分为三种不同的方法 这是我的导入方法: @Transactional(propagation = Propagation.REQUIRES_NEW) private void readRowFromExcel(Row row){ for(Row row : sheet){ Customer customer = readCustomerF
@Transactional(propagation = Propagation.REQUIRES_NEW)
private void readRowFromExcel(Row row){
for(Row row : sheet){
Customer customer = readCustomerFromExcel(row)
CustomerDeatails customerDetails = readCustomerDetailsFromExcel(row)
customerService.save(customer,customerDetails);
MyEntity myEntity = readMyEntityFromExcel(row);
myEntityService.save(myEntity)
}
}
这是客户服务中的保存方法
@Transactional(propagation = Propagation.REQUIRED)
public void save(Customer customer, CustomerDetails customerDetails){
customerRepository.save(customer);
customerDatailsRepository.save(customer);
}
这是myEntity服务中的保存方法:
@Transactional(propagation = Propagation.REQUIRED)
public void save(MyEntity myEntity){
myEntityRepository.save(myEntity)
}
现在我的问题是如果我在下面的代码行中遇到异常
MyEntity MyEntity=readMyEntityFromExcelrow
实体customer和customerDetails已经是持久的,而我应该只在一切正常的情况下保存
我的spring-context.xml
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="${db.driverClass}" />
<property name="url" value="${db.connectionURL}" />
<property name="username" value="${db.username}" />
<property name="password" value="${db.password}" />
</bean>
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager"
p:entityManagerFactory-ref="entityManagerFactory">
<property name="persistenceUnitName" value="myUnit" />
</bean>
<!--
<bean id="hibernateJpaVendorAdapter" class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
<description>Allow spring to configure hibernate specific settings</description>
</bean>
-->
<bean id="eclipseLinkJpaVendorAdapter" class="org.springframework.orm.jpa.vendor.EclipseLinkJpaVendorAdapter">
</bean>
<bean id="entityManagerFactory"
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"
p:dataSource-ref="dataSource"
p:persistenceUnitName="myUnit"
p:jpaVendorAdapter-ref="eclipseLinkJpaVendorAdapter">
<property name="jpaPropertyMap">
<map>
<entry key="eclipselink.cache.shared.default" value="false" />
<entry key="eclipselink.weaving" value="false" />
</map>
</property>
<property name="loadTimeWeaver">
<bean
class="org.springframework.instrument.classloading.InstrumentationLoadTimeWeaver" />
</property>
</bean>
<tx:annotation-driven transaction-manager="transactionManager" />
如何解决此问题?解决方案很简单:在进行任何数据库持久化之前,移动从excel读取的行:
@Transactional(propagation = Propagation.REQUIRES_NEW)
private void readRowFromExcel(Row row){
for(Row row : sheet){
//Reading from Excel
Customer customer = readCustomerFromExcel(row)
CustomerDeatails customerDetails = readCustomerDetailsFromExcel(row);
MyEntity myEntity = readMyEntityFromExcel(row);
//DB persisting
customerService.save(customer,customerDetails);
myEntityService.save(myEntity)
}
}
如果我试图保存实体时发生异常?因为您处于事务中,所有内容都应该回滚。如果不是这样,那么您的数据源可能不是JTA,或者您的DB表不支持事务。