最近在搭建SSH平台时,发现一个疑惑,applicationcontext.xml中的 事务配置代码(红色代码区),
发现是一个可有可无的配置项,删除了代码,照样能连接oracle数据库,保存对象。
非常不解,按理事务应该回滚的,求教中。
spring 配置代码如下:<?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"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
<property name="driverClassName" value="oracle.jdbc.driver.OracleDriver">
</property>
<property name="url" value="jdbc:oracle:thin:@127.0.0.1:1521:sky">
</property>
<property name="username" value="shop"></property>
<property name="password" value="shop"></property>
</bean>
<bean id="sessionFactory"
class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<property name="dataSource">
<ref bean="dataSource" />
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">
org.hibernate.dialect.Oracle9Dialect
</prop>
</props>
</property>
<property name="mappingResources">
<list>
<value>domain/Users.hbm.xml</value>
<value>domain/Dishes.hbm.xml</value>
<value>domain/Orders.hbm.xml</value>
<value>domain/Detail.hbm.xml</value>
</list>
</property>
</bean>
<bean id="txManager"
class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory" />
</bean> <bean id="UsersDAO" class="daoimpl.UsersDAOimpl">
<property name="sessionFactory">
<ref bean="sessionFactory" />
</property>
</bean>
<bean id="DishesDAO" class="daoimpl.DishesDAOimpl">
<property name="sessionFactory">
<ref bean="sessionFactory" />
</property>
</bean>
<bean id="OrdersDAO" class="daoimpl.OrdersDAOimpl">
<property name="sessionFactory">
<ref bean="sessionFactory" />
</property>
</bean>
<bean id="DetailDAO" class="daoimpl.DetailDAOimpl">
<property name="sessionFactory">
<ref bean="sessionFactory" />
</property>
</bean> <bean id="serviceregiest" class="serviceimpl.Regiestserviceimpl">
<property name="usersDAO">
<ref bean="UsersDAO" />
</property>
</bean> <bean id="actionregiest" class="action.regiest">
<property name="regiestserviceimpl">
<ref bean="serviceregiest" />
</property>
</bean></beans>hibernate 实现的dao层代码如下:
package daoimpl;import java.util.List;
import java.util.Set;
import org.hibernate.LockMode;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;import dao.UsersDAO;
import domain.Users;/**
* A data access object (DAO) providing persistence and search support for Users
* entities. Transaction control of the save(), update() and delete() operations
* can directly support Spring container-managed transactions or they can be
* augmented to handle user-managed Spring transactions. Each of these methods
* provides additional information for how to configure it for the desired type
* of transaction control.
*
* @see domain.Users
* @author MyEclipse Persistence Tools
*/public class UsersDAOimpl extends HibernateDaoSupport implements UsersDAO {
private static final Logger log = LoggerFactory.getLogger(UsersDAOimpl.class);
protected void initDao() {
// do nothing
} /* (non-Javadoc)
* @see daoimpl.UsersDAO#save(domain.Users)
*/
public void save(Users transientInstance) {
log.debug("saving Users instance");
try {
getHibernateTemplate().save(transientInstance);
log.debug("save successful");
} catch (RuntimeException re) {
log.error("save failed", re);
throw re;
}
} /* (non-Javadoc)
* @see daoimpl.UsersDAO#delete(domain.Users)
*/
public void delete(Users persistentInstance) {
log.debug("deleting Users instance");
try {
getHibernateTemplate().delete(persistentInstance);
log.debug("delete successful");
} catch (RuntimeException re) {
log.error("delete failed", re);
throw re;
}
} /* (non-Javadoc)
* @see daoimpl.UsersDAO#findById(java.math.BigDecimal)
*/
public Users findById(java.math.BigDecimal id) {
log.debug("getting Users instance with id: " + id);
try {
Users instance = (Users) getHibernateTemplate().get("domain.Users",
id);
return instance;
} catch (RuntimeException re) {
log.error("get failed", re);
throw re;
}
} /* (non-Javadoc)
* @see daoimpl.UsersDAO#findByExample(domain.Users)
*/
public List findByExample(Users instance) {
log.debug("finding Users instance by example");
try {
List results = getHibernateTemplate().findByExample(instance);
log.debug("find by example successful, result size: "
+ results.size());
return results;
} catch (RuntimeException re) {
log.error("find by example failed", re);
throw re;
}
} /* (non-Javadoc)
* @see daoimpl.UsersDAO#findByProperty(java.lang.String, java.lang.Object)
*/
public List findByProperty(String propertyName, Object value) {
log.debug("finding Users instance with property: " + propertyName
+ ", value: " + value);
try {
String queryString = "from Users as model where model."
+ propertyName + "= ?";
return getHibernateTemplate().find(queryString, value);
} catch (RuntimeException re) {
log.error("find by property name failed", re);
throw re;
}
} /* (non-Javadoc)
* @see daoimpl.UsersDAO#findByUsername(java.lang.Object)
*/
public List findByUsername(Object username) {
return findByProperty(USERNAME, username);
} /* (non-Javadoc)
* @see daoimpl.UsersDAO#findByRealname(java.lang.Object)
*/
public List findByRealname(Object realname) {
return findByProperty(REALNAME, realname);
} /* (non-Javadoc)
* @see daoimpl.UsersDAO#findByEmail(java.lang.Object)
*/
public List findByEmail(Object email) {
return findByProperty(EMAIL, email);
} /* (non-Javadoc)
* @see daoimpl.UsersDAO#findByPassword(java.lang.Object)
*/
public List findByPassword(Object password) {
return findByProperty(PASSWORD, password);
} /* (non-Javadoc)
* @see daoimpl.UsersDAO#findByAddre(java.lang.Object)
*/
public List findByAddre(Object addre) {
return findByProperty(ADDRE, addre);
} /* (non-Javadoc)
* @see daoimpl.UsersDAO#findByTele(java.lang.Object)
*/
public List findByTele(Object tele) {
return findByProperty(TELE, tele);
} /* (non-Javadoc)
* @see daoimpl.UsersDAO#findAll()
*/
public List findAll() {
log.debug("finding all Users instances");
try {
String queryString = "from Users";
return getHibernateTemplate().find(queryString);
} catch (RuntimeException re) {
log.error("find all failed", re);
throw re;
}
} /* (non-Javadoc)
* @see daoimpl.UsersDAO#merge(domain.Users)
*/
public Users merge(Users detachedInstance) {
log.debug("merging Users instance");
try {
Users result = (Users) getHibernateTemplate().merge(
detachedInstance);
log.debug("merge successful");
return result;
} catch (RuntimeException re) {
log.error("merge failed", re);
throw re;
}
} /* (non-Javadoc)
* @see daoimpl.UsersDAO#attachDirty(domain.Users)
*/
public void attachDirty(Users instance) {
log.debug("attaching dirty Users instance");
try {
getHibernateTemplate().saveOrUpdate(instance);
log.debug("attach successful");
} catch (RuntimeException re) {
log.error("attach failed", re);
throw re;
}
} /* (non-Javadoc)
* @see daoimpl.UsersDAO#attachClean(domain.Users)
*/
public void attachClean(Users instance) {
log.debug("attaching clean Users instance");
try {
getHibernateTemplate().lock(instance, LockMode.NONE);
log.debug("attach successful");
} catch (RuntimeException re) {
log.error("attach failed", re);
throw re;
}
} public static UsersDAO getFromApplicationContext(ApplicationContext ctx) {
return (UsersDAO) ctx.getBean("UsersDAO");
}
}
发现是一个可有可无的配置项,删除了代码,照样能连接oracle数据库,保存对象。
非常不解,按理事务应该回滚的,求教中。
spring 配置代码如下:<?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"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
<property name="driverClassName" value="oracle.jdbc.driver.OracleDriver">
</property>
<property name="url" value="jdbc:oracle:thin:@127.0.0.1:1521:sky">
</property>
<property name="username" value="shop"></property>
<property name="password" value="shop"></property>
</bean>
<bean id="sessionFactory"
class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<property name="dataSource">
<ref bean="dataSource" />
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">
org.hibernate.dialect.Oracle9Dialect
</prop>
</props>
</property>
<property name="mappingResources">
<list>
<value>domain/Users.hbm.xml</value>
<value>domain/Dishes.hbm.xml</value>
<value>domain/Orders.hbm.xml</value>
<value>domain/Detail.hbm.xml</value>
</list>
</property>
</bean>
<bean id="txManager"
class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory" />
</bean> <bean id="UsersDAO" class="daoimpl.UsersDAOimpl">
<property name="sessionFactory">
<ref bean="sessionFactory" />
</property>
</bean>
<bean id="DishesDAO" class="daoimpl.DishesDAOimpl">
<property name="sessionFactory">
<ref bean="sessionFactory" />
</property>
</bean>
<bean id="OrdersDAO" class="daoimpl.OrdersDAOimpl">
<property name="sessionFactory">
<ref bean="sessionFactory" />
</property>
</bean>
<bean id="DetailDAO" class="daoimpl.DetailDAOimpl">
<property name="sessionFactory">
<ref bean="sessionFactory" />
</property>
</bean> <bean id="serviceregiest" class="serviceimpl.Regiestserviceimpl">
<property name="usersDAO">
<ref bean="UsersDAO" />
</property>
</bean> <bean id="actionregiest" class="action.regiest">
<property name="regiestserviceimpl">
<ref bean="serviceregiest" />
</property>
</bean></beans>hibernate 实现的dao层代码如下:
package daoimpl;import java.util.List;
import java.util.Set;
import org.hibernate.LockMode;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;import dao.UsersDAO;
import domain.Users;/**
* A data access object (DAO) providing persistence and search support for Users
* entities. Transaction control of the save(), update() and delete() operations
* can directly support Spring container-managed transactions or they can be
* augmented to handle user-managed Spring transactions. Each of these methods
* provides additional information for how to configure it for the desired type
* of transaction control.
*
* @see domain.Users
* @author MyEclipse Persistence Tools
*/public class UsersDAOimpl extends HibernateDaoSupport implements UsersDAO {
private static final Logger log = LoggerFactory.getLogger(UsersDAOimpl.class);
protected void initDao() {
// do nothing
} /* (non-Javadoc)
* @see daoimpl.UsersDAO#save(domain.Users)
*/
public void save(Users transientInstance) {
log.debug("saving Users instance");
try {
getHibernateTemplate().save(transientInstance);
log.debug("save successful");
} catch (RuntimeException re) {
log.error("save failed", re);
throw re;
}
} /* (non-Javadoc)
* @see daoimpl.UsersDAO#delete(domain.Users)
*/
public void delete(Users persistentInstance) {
log.debug("deleting Users instance");
try {
getHibernateTemplate().delete(persistentInstance);
log.debug("delete successful");
} catch (RuntimeException re) {
log.error("delete failed", re);
throw re;
}
} /* (non-Javadoc)
* @see daoimpl.UsersDAO#findById(java.math.BigDecimal)
*/
public Users findById(java.math.BigDecimal id) {
log.debug("getting Users instance with id: " + id);
try {
Users instance = (Users) getHibernateTemplate().get("domain.Users",
id);
return instance;
} catch (RuntimeException re) {
log.error("get failed", re);
throw re;
}
} /* (non-Javadoc)
* @see daoimpl.UsersDAO#findByExample(domain.Users)
*/
public List findByExample(Users instance) {
log.debug("finding Users instance by example");
try {
List results = getHibernateTemplate().findByExample(instance);
log.debug("find by example successful, result size: "
+ results.size());
return results;
} catch (RuntimeException re) {
log.error("find by example failed", re);
throw re;
}
} /* (non-Javadoc)
* @see daoimpl.UsersDAO#findByProperty(java.lang.String, java.lang.Object)
*/
public List findByProperty(String propertyName, Object value) {
log.debug("finding Users instance with property: " + propertyName
+ ", value: " + value);
try {
String queryString = "from Users as model where model."
+ propertyName + "= ?";
return getHibernateTemplate().find(queryString, value);
} catch (RuntimeException re) {
log.error("find by property name failed", re);
throw re;
}
} /* (non-Javadoc)
* @see daoimpl.UsersDAO#findByUsername(java.lang.Object)
*/
public List findByUsername(Object username) {
return findByProperty(USERNAME, username);
} /* (non-Javadoc)
* @see daoimpl.UsersDAO#findByRealname(java.lang.Object)
*/
public List findByRealname(Object realname) {
return findByProperty(REALNAME, realname);
} /* (non-Javadoc)
* @see daoimpl.UsersDAO#findByEmail(java.lang.Object)
*/
public List findByEmail(Object email) {
return findByProperty(EMAIL, email);
} /* (non-Javadoc)
* @see daoimpl.UsersDAO#findByPassword(java.lang.Object)
*/
public List findByPassword(Object password) {
return findByProperty(PASSWORD, password);
} /* (non-Javadoc)
* @see daoimpl.UsersDAO#findByAddre(java.lang.Object)
*/
public List findByAddre(Object addre) {
return findByProperty(ADDRE, addre);
} /* (non-Javadoc)
* @see daoimpl.UsersDAO#findByTele(java.lang.Object)
*/
public List findByTele(Object tele) {
return findByProperty(TELE, tele);
} /* (non-Javadoc)
* @see daoimpl.UsersDAO#findAll()
*/
public List findAll() {
log.debug("finding all Users instances");
try {
String queryString = "from Users";
return getHibernateTemplate().find(queryString);
} catch (RuntimeException re) {
log.error("find all failed", re);
throw re;
}
} /* (non-Javadoc)
* @see daoimpl.UsersDAO#merge(domain.Users)
*/
public Users merge(Users detachedInstance) {
log.debug("merging Users instance");
try {
Users result = (Users) getHibernateTemplate().merge(
detachedInstance);
log.debug("merge successful");
return result;
} catch (RuntimeException re) {
log.error("merge failed", re);
throw re;
}
} /* (non-Javadoc)
* @see daoimpl.UsersDAO#attachDirty(domain.Users)
*/
public void attachDirty(Users instance) {
log.debug("attaching dirty Users instance");
try {
getHibernateTemplate().saveOrUpdate(instance);
log.debug("attach successful");
} catch (RuntimeException re) {
log.error("attach failed", re);
throw re;
}
} /* (non-Javadoc)
* @see daoimpl.UsersDAO#attachClean(domain.Users)
*/
public void attachClean(Users instance) {
log.debug("attaching clean Users instance");
try {
getHibernateTemplate().lock(instance, LockMode.NONE);
log.debug("attach successful");
} catch (RuntimeException re) {
log.error("attach failed", re);
throw re;
}
} public static UsersDAO getFromApplicationContext(ApplicationContext ctx) {
return (UsersDAO) ctx.getBean("UsersDAO");
}
}
<bean id="txManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory" />
</bean>
<aop:config>
<!--配置哪个包里的需要回滚-->
<aop:advisor pointcut="execution(public * com.yunwang.zhaob.service.impl.*.*(..))" advice-ref="txAdvice"/>
</aop:config>
<tx:advice id="txAdvice" transaction-manager="txManager">
<!--配置回滚条件-->
<tx:attributes>
<tx:method name="get*" read-only="true"/>
<tx:method name="query*" read-only="true"/>
<tx:method name="find*" read-only="true"/>
<tx:method name="load*" read-only="true"/>
<tx:method name="list*" read-only="true"/>
<tx:method name="*" rollback-for="Exception"/>
</tx:attributes>
</tx:advice>
<bean id="txManager"
class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory" />
</bean>
红色代码 是上门这段我的问题是 这段代码 在spring 配置中可有可无 都能对持久化到数据库 不是很理解
<bean id="txManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory">
<ref local="sess" />
</property>
</bean> <!-- 定义一个事务拦截器 -->
<tx:advice id="txAdvice" transaction-manager="txManager">
<tx:attributes>
<tx:method name="get*" read-only="true" />
<tx:method name="*" />
</tx:attributes>
</tx:advice> <!--定义模块的service切入 -->
<aop:config>
<aop:pointcut id="customerPoint"
expression="execution(* com.quanguowuliu.service..*.*(..))" />
<aop:advisor advice-ref="txAdvice"
pointcut-ref="customerPoint" />
</aop:config>
hibernate 实现的dao层 肯定会交给 事务进行管理的呀 如果事务不去管理dao层的,对象就难以持久化到数据库了。 现在的问题是:hibernate中进行事务管理,交由spring配置。但是spring中事务配置可有可无。
事务配置我会 但是不明白 spring 不配置事务 也可以提交事务 使对象持久化到数据库
spring xml中的事务配置
<bean id="txManager"
class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory" />
</bean>
即使不配置这个也可以使dao层提交事务,使对象持久化到数据库 求解中....
一般来说,我们把事务配置在service层,也就是业务逻辑层(主要是DAO层的操作都是原子性的,在service层可能多次数据库操作需要一个事务来进行);而事务有一些属性,事务属性通常由事务的传播行为,事务的隔离级别,事务的超时值和事务只读标志组成,然后根据这些属性配置来定义事务(具体自己去学);spring提供了多种事务配置方式,你可以选择某种方式把它应用到你的serviceregiest上去,这样你的操作就有事务管理了。
自己有点乱了 想请问
<bean id="txManager"
class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory" />
</bean>
这个配置 是什么意思
就像new一个对象。。但是没有用到一样正确配置例子如下: <!-- 定义事物管理器 -->
<bean id="transactionManager"
class="org.springframework.orm.hibernate3.HibernateTransactionManager"
depends-on="sessionFactory">
<property name="sessionFactory">
<ref local="sessionFactory" />
</property>
</bean> <bean id="transactionBase"
class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean"
lazy-init="true" abstract="true">
<!-- 配置事务管理器 -->
<property name="transactionManager">
<ref bean="transactionManager" />
</property>
<!-- 配置事务属性 -->
<property name="transactionAttributes">
<props>
<prop key="delete*">
PROPAGATION_REQUIRED,-HibernateException,-SQLException
</prop>
<prop key="add*">
PROPAGATION_REQUIRED,-HibernateException,-SQLException
</prop>
<prop key="update*">
PROPAGATION_REQUIRED,-HibernateException,-SQLException
</prop>
<prop key="save*">
PROPAGATION_REQUIRED,-HibernateException,-SQLException
</prop>
<prop key="insert*">
PROPAGATION_REQUIRED,-HibernateException,-SQLException
</prop>
<prop key="find*">PROPAGATION_REQUIRED,readOnly</prop>
<prop key="get*">PROPAGATION_REQUIRED,readOnly</prop>
<prop key="apply*">PROPAGATION_REQUIRED,readOnly</prop>
</props>
</property>
</bean>
所以如果你没有配置txManager,sessionFactory会使用默认的事物机制。
你说的挺对的,但是我想问 spring中 不配置
<bean id="txManager"
class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory" />
这个,是不是默认会提供事务配置的呀
</bean>
sessionFactory会使用默认的事物机制,能具体一些吗?
<bean id="txManager"
class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory" />
</bean>
定义了事务管理器,使用:@Transactional
1、了解什么是事务,它4个特征,及事务的一些属性;
2、了解Spring的代理机制;像上面一位楼兄提供了一个很典型的事务配置,通过一个代理类,Spring把事务应用到target上(当然target还需要你配置下,target就是你要应用事务的Bean);
3、了解Spring的DAO、ORM的体系结构;在配置都是很明显的:
sessionFactory是LocalSessionFactoryBean,
TransactionManager是HibernateTransactionManager,而Spring会把sessionFactory注入给TransactionManager,你可以查看这些类的实现;
还有你的所有DAO都继承了HibernateDaoSupport,为什么这些DAO能做DB的操作;
等等