通过连接到多个数据库进行Spring事务

Question

我正在尝试一个小程序，在这里我可以使用Spring连接到多个数据库，并通过在Weblogic服务器上部署Web应用程序来尝试使用Spring事务。 问题是事务管理无法正常工作。 我正在尝试在2个数据库中插入记录，第一个插入时不引发任何异常，在编写第二个插入查询时，它引发了异常。 理想情况下，事务应回滚，但第一个事务已提交而没有任何问题。

这是我的spring-config.xml文件

<context:component-scan base-package="com.examples" />

<!-- Database1 -->

<bean id="db1DataSource" class="org.apache.commons.dbcp.BasicDataSource"
    destroy-method="close">
    <property name="driverClassName" value="com.mysql.jdbc.Driver" />
    <property name="url" value="jdbc:mysql://localhost:3306/mydb1" />
    <property name="username" value="root" />
    <property name="password" value="" />
</bean>

<!-- Database2 -->

<bean id="db2DataSource" class="org.apache.commons.dbcp.BasicDataSource"
    destroy-method="close">
    <property name="driverClassName" value="com.mysql.jdbc.Driver" />
    <property name="url" value="jdbc:mysql://localhost:3306/mydb2" />
    <property name="username" value="root" />
    <property name="password" value="" />
</bean>

<tx:annotation-driven transaction-manager="txManager" />
<bean id="txManager" class="org.springframework.transaction.jta.JtaTransactionManager" />

<bean
    class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="viewClass"
        value="org.springframework.web.servlet.view.JstlView" />
    <property name="prefix">
        <value>/WEB-INF/views/</value>
    </property>
    <property name="suffix" value=".jsp" />
</bean>

这是我的控制器：

@Controller
public class EmployeeController {

    @Autowired
    private CommonEmployeeService commonService;

    @RequestMapping(value = "/employee", method = GET)
    public String showPersonListForGivenAge(
            @RequestParam(value = "id") int id,
            @RequestParam(value = "name") String name,
            @RequestParam(value = "email") String email,
            Map<String, Object> model) {

        Employee e = new Employee(id,name);
        EmployeeDetails details = new EmployeeDetails(id,email);

        commonService.insert(e, details);

        return "welcome";
    }
}

这是我的共同服务：

@Service
public class CommonEmployeeService {

    @Autowired
    EmployeeDetailsService detailsService;

    @Autowired
    EmployeeService service;


    @Transactional
    public boolean insert(Employee e, EmployeeDetails details) {
        service.insert(e);
        detailsService.insert(details);
        return true;
    }
}

这些是我的其他服务：

EmployeeService.java

@Service

public class EmployeeService {

    @Autowired
    EmployeeDao dao;

    //@Transactional(propagation=Propagation.REQUIRED)
    public boolean insert(Employee e) {
        return dao.insert(e);
    }
}

EmployeeDetailsS​​ervice.java-此服务中的DAO抛出NullPointerException

@Service
public class EmployeeDetailsService {

    @Autowired
    EmployeeDetailsDao dao;

    //@Transactional(propagation=Propagation.REQUIRED)
    public boolean insert(EmployeeDetails e) {
        return dao.insert(e);
    }

}

更新：添加道类：

EmployeeDao.java：

@Repository
public class EmployeeDao {

    JdbcTemplate template;

    @Resource(name = "db1DataSource")
    public void setDataSource(DataSource dataSource) {
        this.template = new JdbcTemplate(dataSource);
    }

    public boolean insert(Employee e) {
        int cnt = template.update("insert into Employee values(?,?)",
                e.getId(), e.getName());
        if (cnt > 0) {
            return true;
        }
        return false;
    }
}

EmployeeDetailsDao.java

@Repository
public class EmployeeDetailsDao {

    JdbcTemplate template;

    @Resource(name = "db2DataSource")
    public void setDataSource(DataSource dataSource) {
        this.template = new JdbcTemplate(dataSource);
    }

    public boolean insert(EmployeeDetails e) {
        if(e != null){
            throw new NullPointerException();   
        }

        int cnt = template.update("insert into EmployeeDetails values(?,?)",
                e.getId(), e.getEmail());
        if (cnt > 0) {
            return true;
        }
        return false;
    }
}

Answer 1

尝试在spring-config.xml添加以下内容：

<context:component-scan base-package=“your.packagename.contatining.EmployeeDetailsDao” />
<mvc:annotation-driven />

并使用@Transactional(rollbackFor=Exception.class, propagation=Propagation.REQUIRED)在CommonEmployeeService更改@Transactional ，如下所示

@Service
public class CommonEmployeeService {

    @Autowired
    EmployeeDetailsService detailsService;

    @Autowired
    EmployeeService service;

@Transactional(rollbackFor=Exception.class, propagation=Propagation.REQUIRED)
    public boolean insert(Employee e, EmployeeDetails details) {
        service.insert(e);
        detailsService.insert(details);
        return true;
    }
}