Spring 以编程方式切换到 JDBCTemplate 时事务不会回滚

Spring transaction doesn't rollback when switching to JDBCTemplate programmatically

我有这个用例,我需要从一个 Oracle 模式获取数据并将它们插入另一个模式,table by table。对于阅读和写作,我通过 JDBCTemplate 使用不同的数据源。它们之间的切换是在代码中完成的。此外,我还有一个 Hibernate 连接,用于从配置 tables 中读取数据。这也是我的默认连接,在应用程序启动时通过自动装配设置的连接。我正在使用 Spring 4、Hibernate 4.3 和 Oracle 11。

对于 JDBCTemplate,我有一个包含 JDBCTemplate 的抽象 class,如下所示:

public abstract class GenericDao implements SystemChangedListener {

    private NamedParameterJdbcTemplate jdbcTemplate;    
    /**
     * Initializing the bean with the definition data source through @Autowired
     * @param definitionDataSource as instance of @DataSource
     */

    @Autowired
    private void setDataSource(DataSource definitionDataSource) {
        this.jdbcTemplate = new NamedParameterJdbcTemplate(definitionDataSource);
    }

    public NamedParameterJdbcTemplate getNamedParameterJdbcTemplate(){
        return this.jdbcTemplate;
    }

    @Override
    public void updateDataSource(DataSource dataSource) {
        this.setDataSource(dataSource);
    }
}

SystemChangedListener 接口定义了 updateDataSource 方法,当通过 Service 方法切换 DataSource 时调用该方法,如下所示:

public class SystemServiceImpl implements SystemService, SystemChangable {

    private List<GenericDao> daoList;


    @Autowired
    public void setDaoList(final List<GenericDao> daoList){
        this.daoList = daoList; 
    }

    @Override
    public void notifyDaos(SystemDTO activeSystem) {
        logger.debug("Notifying DAO of change in datasource...");
        for(GenericDao dao : this.daoList){
            dao.updateDataSource(activeSystem.getDataSource());
        }
        logger.debug("...done.");
    }

@Override
public Boolean switchSystem(final SystemDTO toSystem) {
    logger.info("Switching active system...");
    notifyDaos(toSystem);   
    logger.info("Active system and datasource switched to: " + toSystem.getName());
    return true;
}

}

到目前为止,切换非常适合阅读。我可以毫无问题地在模式之间切换,但是如果在复制过程中由于某种原因我遇到异常,则事务不会回滚。

这是我的copyint方法:

    @Transactional(rollbackFor = RuntimeException.class, propagation=Propagation.REQUIRED)
    public void replicateSystem(String fromSystem, String toSystem) throws ApplicationException {

        // FIXME: pass the user as information
        // TODO: actually the method should take some model from the view and transform it in DTOs and stuff

        StringBuffer protocolMessageBuf = new StringBuffer();
        ReplicationProtocolEntryDTO replicationDTO = new ReplicationProtocolEntryDTO();
        String userName = "xxx";
        Date startTimeStamp = new Date();

        try {
            replicationStatusService.markRunningReplication();

            List<ManagedTableReplicationDTO> replications = retrieveActiveManageTableReplications(fromSystem, toSystem);
            protocolMessageBuf.append("Table count: ");
            protocolMessageBuf.append(replications.size());
            protocolMessageBuf.append(". ");            

            for (ManagedTableReplicationDTO repDTO : replications) {
                protocolMessageBuf.append(repDTO.getTableToReplicate());
                protocolMessageBuf.append(": ");

                logger.info("Switching to source system: " + repDTO.getSourceSystem());
                SystemDTO system = systemService.retrieveSystem(repDTO.getSourceSystem());
                systemService.switchSystem(system);

                ManagedTableDTO managedTable = managedTableService.retrieveAllManagedTableData(repDTO.getTableToReplicate());
                protocolMessageBuf.append(managedTable.getRows() != null ? managedTable.getRows().size() : null);
                protocolMessageBuf.append("; ");
                ManagedTableUtils managedTableUtils = new ManagedTableUtils();

                List<String> inserts = managedTableUtils.createTableInserts(managedTable);

                logger.info("Switching to target system: " + repDTO.getSourceSystem());
                SystemDTO targetSystem = systemService.retrieveSystem(repDTO.getTargetSystem());
                systemService.switchSystem(targetSystem);

                // TODO: what about constraints? foreign keys
                logger.info("Cleaning up data in target table: " + repDTO.getTargetSystem());

                managedTableService.cleanData(repDTO.getTableToReplicate());

                /*
                managedTableDao.deleteContents(repDTO.getTableToReplicate());
                */
                // importing the data
                managedTableService.importData(inserts);
                /*
                for (String insrt : inserts) {
                    managedTableDao.executeSqlInsert(insrt);
                }       
*/
                protocolMessageBuf.append("Replication successful.");
            }
        } catch (ApplicationException ae) {
            protocolMessageBuf.append("ERROR: ");
            protocolMessageBuf.append(ae.getMessage());
            throw new RuntimeException("Error replicating a table. Rollback.");
        } finally {
            replicationDTO = this.prepareProtocolRecord(userName, startTimeStamp, protocolMessageBuf.toString(), fromSystem, toSystem);
            replicationProtocolService.writeProtocolEntry(replicationDTO);
            replicationStatusService.markFinishedReplication();
        }
    }

我所做的是,我检索一个包含 tables 的列表,其内容应该被复制并在一个循环中,为它们生成插入语句,删除目标 table 的内容并执行

的插入
public void executeSqlInsert(String insert) throws DataAccessException {
        getNamedParameterJdbcTemplate().getJdbcOperations().execute(insert);    
}

在此使用了正确的数据源 - 目标系统的数据源。例如,当在插入数据的过程中某处出现 SQLException 时,数据的删除仍然被提交并且目标 table 的数据丢失。我对获得例外没有问题。事实上,这是要求的一部分——所有的异常都应该得到协议,如果有异常,整个复制过程必须回滚。

这是我的 db.xml:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:util="http://www.springframework.org/schema/util"
       xmlns:jdbc="http://www.springframework.org/schema/jdbc"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:jpa="http://www.springframework.org/schema/data/jpa"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
       http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
       http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
       http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd
       http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd
       http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
       http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa.xsd">

    <!-- Scans within the base package of the application for @Components to configure as beans -->
    <bean id="placeholderConfig"
        class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="location" value="classpath:/db.properties" />
    </bean>

     <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"
            p:packagesToScan="de.telekom.cldb.admin"
            p:dataSource-ref="dataSource"
            p:jpaPropertyMap-ref="jpaPropertyMap"
            p:jpaVendorAdapter-ref="hibernateVendor" />

    <bean id="hibernateVendor" class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
        <property name="showSql" value="true" />
        <property name="generateDdl" value="true" />
        <property name="databasePlatform" value="${db.dialect}" />
    </bean>

    <!-- system 'definition' data source -->
    <bean id="dataSource"
          class="org.apache.commons.dbcp.BasicDataSource"
          destroy-method="close"
          p:driverClassName="${db.driver}"
          p:url="${db.url}"
          p:username="${db.username}"
          p:password="${db.password}" />
          <!-- 
          p:maxActive="${dbcp.maxActive}"
          p:maxIdle="${dbcp.maxIdle}"
          p:maxWait="${dbcp.maxWait}"/>
           -->

    <util:map id="jpaPropertyMap">
        <entry key="generateDdl" value="false"/>
        <entry key="hibernate.hbm2ddl.auto" value="validate"/>
        <entry key="hibernate.dialect" value="${db.dialect}"/>
        <entry key="hibernate.default_schema" value="${db.schema}"/>
        <entry key="hibernate.format_sql" value="false"/>
        <entry key="hibernate.show_sql" value="true"/>
    </util:map>


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

    <!-- supports both JDBCTemplate connections and JPA -->
    <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="entityManagerFactory" ref="entityManagerFactory" />
    </bean>

所以我的问题是事务没有回滚。而且,我在日志文件中没有看到任何线索,根本没有启动交易。我究竟做错了什么?

感谢您的帮助! 阿尔

我不确定?但我觉得问题就在这一点

// TODO: what about constraints? foreign keys

            logger.info("Cleaning up data in target table: " +   repDTO.getTargetSystem());
            managedTableService.cleanData(repDTO.getTableToReplicate());

如果表的清除抛出 trunc some_table 那么此时 Oracle 提交事务。

正如我在评论中所说,默认情况下,spring 框架在运行时将事务标记为回滚,即未经检查的异常(任何属于 RuntimeException 的子类的异常也包含在这个)。另一方面,从事务方法生成的已检查异常不会触发自动事务回滚。

为什么?很简单,正如我们所了解的,检查异常对于处理或抛出是必要的(必须)。因此,就像您所做的那样,从事务方法中抛出已检查的异常将告诉 spring 框架(发生了此抛出的异常并且)您知道自己在做什么,从而使框架跳过回滚部分。在未经检查的异常情况下,它被认为是错误或错误的异常处理,因此回滚事务以避免数据损坏。

根据您已检查 ApplicationExceptionreplicateSystem 方法代码,ApplicationException 不会触发自动回滚。因为当异常发生时,客户端(应用程序)有机会恢复。

根据文档,应用程序异常是不扩展 RuntimeException 的。

根据我对 EJB 的了解,如果需要自动回滚事务,我们可以使用 @ApplicationException(rollback=true)