场景：
1）系统有多个数据库
2）且数据库类型也不尽相同
3）现在应用根据某些条件路由到具体的数据库
4）且在spring+hibernate框架下，支持依赖注入
已有实现，spring动态数据源，但无法实现动态SessionFactory，即不通数据库的方言不一样
目标：
在spring动态数据源的基础上，实现动态SessionFactory
1.配置多个数据源和SessionFactory，并给相应SessionFactory配置事务管理：
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop"
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/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/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<!-- FOR SqlServer-->
<bean id="SqlServer_DataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.microsoft.sqlserver.jdbc.SQLServerDriver" />
<property name="url"
value="url" />
<property name="username" value="username" />
<property name="password" value="password" />
</bean>
<bean id="SqlServer_SessionFactory"
class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"
p:mappingLocations="classpath:/com/entity/*.hbm.xml">
<property name="dataSource" ref="SqlServer_DataSource" />
<property name="hibernateProperties">
<props>
<prop key="hibernate.query.factory_class">org.hibernate.hql.ast.ASTQueryTranslatorFactory</prop>
<prop key="hibernate.dialect">org.hibernate.dialect.SQLServer2008Dialect</prop>
<prop key="hibernate.show_sql">true</prop>
<prop key="hibernate.format_sql">true</prop>
</props>
</property>
</bean>
<bean id="SqlServer_TransactionManager"
class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory" ref="SqlServer_SessionFactory"/>
</bean> <!-- FOR Oracle -->
<bean id="Oracle _DataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="oracle.jdbc.OracleDriver" />
<property name="url" value="jdbc:oracle:thin:@localhost:1521/orcl" />
<property name="username" value="username" />
<property name="password" value="password" />
</bean>
<bean id="Oracle_SessionFactory"
class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"
p:mappingLocations="classpath:/com/entity/*.hbm.xml">
<property name="dataSource" ref="Oracle_DataSource" />
<property name="hibernateProperties">
<props>
<prop key="hibernate.query.factory_class">org.hibernate.hql.ast.ASTQueryTranslatorFactory</prop>
<prop key="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</prop>
<prop key="hibernate.show_sql">true</prop>
<prop key="hibernate.format_sql">true</prop>
</props>
</property>
</bean>
<bean id="Oracle_TransactionManager"
class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory" ref="Oracle_SessionFactory"/>
</bean> </beans>
2. 为SessionFactory配置事务切面：
<tx:advice id="SqlServer_TxAdvice" transaction-manager="SqlServer_TransactionManager">
<tx:attributes>
<tx:method name="get*" read-only="true" />
<tx:method name="find*" read-only="true" />
<tx:method name="*" propagation="REQUIRED" rollback-for="Exception" />
</tx:attributes>
</tx:advice>
<tx:advice id="Oracle_TxAdvice" transaction-manager="Oracle_TransactionManager">
<tx:attributes>
<tx:method name="get*" read-only="true" />
<tx:method name="find*" read-only="true" />
<tx:method name="*" propagation="REQUIRED" rollback-for="Exception" />
</tx:attributes>
</tx:advice> <aop:config proxy-target-class="true">
<aop:pointcut id="txPointcut" expression="execution(* com.service.*.*(..))"/>
<aop:advisor advice-ref="SqlServer_TxAdvice" pointcut-ref="txPointcut" order="1"/>
<aop:advisor advice-ref="Oracle_TxAdvice" pointcut-ref="txPointcut" order="2"/>
</aop:config>
3. 配置一个动态的SessionFactory：
<bean id="sessionFactory" class="com.DynamicSessionFactory"/>
4. 定义DynamicSessionFactory实现接口SessionFactory：
public class DynamicSessionFactory implements SessionFactory ,ApplicationContextAware{
private static final long serialVersionUID = 1L;
private ApplicationContext applicationContext;
private SessionFactory getSessionFactory(String name) {
return (SessionFactory) applicationContext.getBean(name);
}
//根据当前线程的SessionFactoryName获取SessionFactory
private SessionFactory getSessionFactory() {
return getSessionFactory(ThreadLocalUtil.
.getSessionFactoryName());
}
public Reference getReference() throws NamingException {
return getSessionFactory().getReference();
}
public Session openSession() throws HibernateException {
return getSessionFactory().openSession();
}
public Session openSession(Interceptor interceptor)
throws HibernateException {
return getSessionFactory().openSession(interceptor);
}
public Session openSession(Connection connection) {
return getSessionFactory().openSession(connection);
}
public Session openSession(Connection connection, Interceptor interceptor) {
return getSessionFactory().openSession(connection,interceptor);
}
public Session getCurrentSession() throws HibernateException {
return getSessionFactory().getCurrentSession();
}
public StatelessSession openStatelessSession() {
return getSessionFactory().openStatelessSession();
}
public StatelessSession openStatelessSession(Connection connection) {
return getSessionFactory().openStatelessSession(connection);
}
public ClassMetadata getClassMetadata(Class entityClass) {
return getSessionFactory().getClassMetadata(entityClass);
}
public ClassMetadata getClassMetadata(String entityName) {
return getSessionFactory().getClassMetadata(entityName);
}
public CollectionMetadata getCollectionMetadata(String roleName) {
return getSessionFactory().getCollectionMetadata(roleName);
}
public Map getAllClassMetadata() {
return getSessionFactory().getAllClassMetadata();
}
public Map getAllCollectionMetadata() {
return getSessionFactory().getAllCollectionMetadata();
}
public Statistics getStatistics() {
return getSessionFactory().getStatistics();
}
public void close() throws HibernateException {
getSessionFactory().close();
}
public boolean isClosed() {
return getSessionFactory().isClosed();
}
public Cache getCache() {
return getSessionFactory().getCache();
}
public void evict(Class persistentClass) throws HibernateException {
getSessionFactory().evict(persistentClass);
}
public void evict(Class persistentClass, Serializable id)
throws HibernateException {
getSessionFactory().evict(persistentClass, id);
}
public void evictEntity(String entityName) throws HibernateException {
getSessionFactory().evictEntity(entityName);
}
public void evictEntity(String entityName, Serializable id)
throws HibernateException {
getSessionFactory().evictEntity(entityName, id);
}
public void evictCollection(String roleName) throws HibernateException {
getSessionFactory().evictCollection(roleName);
}
public void evictCollection(String roleName, Serializable id)
throws HibernateException {
getSessionFactory().evictCollection(roleName, id);
}
public void evictQueries(String cacheRegion) throws HibernateException {
getSessionFactory().evictQueries(cacheRegion);
}
public void evictQueries() throws HibernateException {
getSessionFactory().evictQueries();
}
public Set getDefinedFilterNames() {
return getSessionFactory().getDefinedFilterNames();
}
public FilterDefinition getFilterDefinition(String filterName)
throws HibernateException {
return getSessionFactory().getFilterDefinition(filterName);
}
public boolean containsFetchProfileDefinition(String name) {
return getSessionFactory().containsFetchProfileDefinition(name);
}
@Override
public void setApplicationContext(ApplicationContext applicationContext)
throws BeansException {
this.applicationContext = applicationContext;
}
}