我对 DAO 和服务层模式有疑问，我将 Spring 3 和 Hibernate 4 用于小型应用程序。
关于我的申请的小描述
我有一个小型应用程序，其中员工和部门数据以 JSF 形式显示。
部门数据使用主数据表以表格形式显示，相关员工数据也使用数据表以表格形式显示，这是明细（主-明细）方案。单击主数据表中的按钮后，将显示一个弹出窗口，可以在其中输入有关部门的详细信息并将数据保留在数据库表中（删除和更新的情况相同）
我的设计如下
DAO 层
public interface GenericDAO<T> {
public void create(T entity);
public void update(T entity);
public void delete(T entity);
}
public interface DepartmentDAO extends GenericDAO<Department>
--methods for getting Department list and others
public void findDepartment(DepartmentData data);
-----
public interface EmployeeDAO extends GenericDAO<Employee>
--methods for getting Employeelist and others
---
服务层
public interface DepartmentService {
public void findDepartment(DepartmentData data);
-- other methods
}
@Transactional
@Named
public class DepartmentServiceImpl implements DepartmentService {
@Inject
DepartmentDAO departmentDAO;
-- implementation of methods
}
public interface EmployeeService {
public void findEmployees(EmployeeData data);
-- other methods
}
@Transactional
@Named
public class EmployeeServiceImpl implements EmployeeService {
@Inject
EmployeeDAO employeeDAO;
-- implementation of methods
}
我的问题是我应该为 Department 和 Employee 使用一个单一的服务接口或类，因为我为我的 JSF 表单使用一个 ManagedBean，还是应该为 Department 和 Employee 使用单独的接口和类？使用@Transactional 在一个服务实现类中拥有所有DAO 方法，在数据库事务时会不会有任何性能问题？是否建议使用类似于 GenericDAO 的通用服务接口？
任何帮助是非常可观的？
更新 1
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-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/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd"
>
<context:component-scan base-package="net.test" />
<!-- Data Source Declaration -->
<bean id="DataSource" class="org.springframework.jndi.JndiObjectFactoryBean">
<property name="jndiName" value="jdbc/myDS"/>
</bean>
<bean
class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor" />
<bean class="org.springframework.orm.hibernate4.HibernateExceptionTranslator" />
<!-- JPA Entity Manager Factory -->
<bean id="entityManagerFactory"
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="dataSource" ref="DataSource" />
<property name="packagesToScan" value="net.test.entity" />
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
<property name="showSql" value="true" />
<property name="generateDdl" value="false" />
<property name="databasePlatform" value="${jdbc.dialectClass}" />
</bean>
</property>
</bean>
<bean id="defaultLobHandler" class="org.springframework.jdbc.support.lob.DefaultLobHandler" />
<!-- Session Factory Declaration -->
<bean id="SessionFactory"
class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
<property name="dataSource" ref="DataSource" />
<property name="annotatedClasses">
<list>
<value>net.test.entity.Employee</value>
<value>net.test.entity.Department</value>
</list>
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</prop>
<prop key="hibernate.show_sql">true</prop>
<prop key="hibernate.query.factory_class">org.hibernate.hql.internal.classic.ClassicQueryTranslatorFactory
</prop>
</props>
</property>
</bean>
<tx:annotation-driven transaction-manager="txManager" />
<tx:annotation-driven transaction-manager="transactionManager" />
<bean id="txManager"
class="org.springframework.orm.hibernate4.HibernateTransactionManager">
<property name="sessionFactory" ref="SessionFactory" />
</bean>
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory" />
</bean>
<!-- <tx:annotation-driven transaction-manager="txManager"/> -->
<context:annotation-config />
<bean id="hibernateStatisticsMBean" class="org.hibernate.jmx.StatisticsService">
<property name="statisticsEnabled" value="true" />
<property name="sessionFactory" value="#{entityManagerFactory.sessionFactory}" />
</bean>
<bean name="ehCacheManagerMBean"
class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean" />
<bean id="mbeanServer" class="org.springframework.jmx.support.MBeanServerFactoryBean">
<property name="locateExistingServerIfPossible" value="true" />
</bean>
<bean id="jmxExporter" class="org.springframework.jmx.export.MBeanExporter"
lazy-init="false">
<property name="server" ref="mbeanServer" />
<property name="registrationBehaviorName" value="REGISTRATION_REPLACE_EXISTING" />
<property name="beans">
<map>
<entry key="SpringBeans:name=hibernateStatisticsMBean"
value-ref="hibernateStatisticsMBean" />
<entry key="SpringBeans:name=ehCacheManagerMBean" value-ref="ehCacheManagerMBean" />
</map>
</property>
</bean>
</beans>