我正在使用以下实现Hibernate持久性的服务层类：
public class AccountsManagerImpl implements IAccountsManager {
private static Logger log = LoggerFactory.getLogger(AccountsManagerImpl.class);
private final SessionFactory sessionFactory;
private AccountDao accountDao;
public AccountsManagerImpl(SessionFactory sessionFactory) {
this.sessionFactory = sessionFactory;
accountDao = new AccountDao(sessionFactory);
}
@Override
public void createAccount(final Account account) {
runInTransaction(new Runnable() {
public void run() {
accountDao.add(account);
}
});
}
@Override
public void modifyAccount(final Account account) {
runInTransaction(new Runnable() {
public void run() {
accountDao.update(account);
}
});
}
@Override
public void deleteAccount(final Account account) {
runInTransaction(new Runnable() {
public void run() {
accountDao.remove(account);
}
});
}
private void runInTransaction(Runnable runnable) {
Session session = sessionFactory.getCurrentSession();
Transaction tx = null;
try {
tx = session.beginTransaction();
runnable.run();
tx.commit();
}
catch(Exception e) {
log.error("Exception during transaction, rolling back", e);
if(tx != null && tx.isActive()) {
try {
tx.rollback();
}
catch(Exception e2) {
log.error("Failed to rollback transaction", e2);
}
throw new IllegalStateException("Transaction failed", e);
}
}
}
}
此类与实体类一起位于单独的库（.jar）中，该库插入到webapp中。 Webapp使用此类具有以下Spring配置：
<?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:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.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="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="schemaUpdate" value="true"/>
<property name="packagesToScan">
<list>
<value>com.rcslabs.webcall.server.model</value>
</list>
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.connection.autocommit">false</prop>
<prop key="hibernate.show_sql">false</prop>
<prop key="hibernate.format_sql">false</prop>
<prop key="hibernate.dialect">${db.dialect}</prop>
<prop key="hibernate.cache.use_query_cache">false</prop>
</props>
</property>
</bean>
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="${db.driver}"/>
<property name="url" value="${db.url}"/>
<property name="username" value="${db.username}"/>
<property name="password" value="${db.password}"/>
</bean>
<bean
class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor"/>
<bean class="com.rcslabs.webcall.server.impl.AccountsManagerImpl">
<constructor-arg ref="sessionFactory"/>
</bean>
</beans>
当调用createAccount方法时，提交事务，对象从数据库序列获取它的id，但数据不是持久的（没有INSERT，表是空的）：
2011-12-12 14:45:22,932 DEBUG: org.hibernate.transaction.JDBCTransaction - begin
2011-12-12 14:45:22,932 DEBUG: org.hibernate.jdbc.ConnectionManager - opening JDBC connection
2011-12-12 14:45:22,932 DEBUG: org.hibernate.transaction.JDBCTransaction - current autocommit status: true
2011-12-12 14:45:22,932 DEBUG: org.hibernate.transaction.JDBCTransaction - disabling autocommit
2011-12-12 14:45:22,934 DEBUG: org.hibernate.jdbc.AbstractBatcher - about to open PreparedStatement (open PreparedStatements: 0, globally: 0)
2011-12-12 14:45:22,936 DEBUG: org.hibernate.SQL - select nextval ('hibernate_sequence')
2011-12-12 14:45:22,940 DEBUG: org.hibernate.id.SequenceGenerator - Sequence identifier generated: BasicHolder[java.lang.Long[12]]
2011-12-12 14:45:22,940 DEBUG: org.hibernate.jdbc.AbstractBatcher - about to close PreparedStatement (open PreparedStatements: 1, globally: 1)
2011-12-12 14:45:22,940 DEBUG: org.hibernate.event.def.AbstractSaveEventListener - generated identifier: 12, using strategy: org.hibernate.id.SequenceGenerator
2011-12-12 14:45:22,946 DEBUG: org.hibernate.transaction.JDBCTransaction - commit
2011-12-12 14:45:22,947 DEBUG: org.hibernate.transaction.JDBCTransaction - re-enabling autocommit
2011-12-12 14:45:22,947 DEBUG: org.hibernate.transaction.JDBCTransaction - committed JDBC Connection
2011-12-12 14:45:22,947 DEBUG: org.hibernate.jdbc.ConnectionManager - transaction completed on session with on_close connection release mode; be sure to close the session to release JDBC resources!
有什么问题？如何正确保存数据？
修改
我不想在库中使用Spring声明式事务（@Transactional）并依赖于相关的Spring类。我只想将正确的SessionFactory传递给Manager并使其正常工作。
答案 0 :(得分：3)
为什么不使用：
<tx:annotation-driven transaction-manager="transactionManager" />
和
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager"
p:entityManagerFactory-ref="entityManagerFactory"
p:dataSource-ref="dataSource" />
那么你可以简单地使用@Transactional注释上面你想要包含在交易中的任何方法吗？
即
@Override
@Transactional
public void createAccount(final Account account) {
accountDao.add(account);
}
答案 1 :(得分：1)
查看org.springframework.orm.hibernate3.HibernateTransactionManager的代码。
在tx.commit（）之前添加session.flush（）解决了问题。
答案 2 :(得分：0)
我在你的应用程序中找不到问题，但我可以回答第二个问题：“如何正确保存数据？”
使用Spring Transaction Template，而不是某些自己的实现。