<aop:aspectj-autoproxy/>
    <context:component-scan base-package="net.orc,com.spring3"/>    
    <context:property-placeholder location="classpath:jdbc.properties"/>
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
        <property name="driverClass" value="${driverClass}"/>
        <property name="jdbcUrl" value="${jdbcUrl}"/>
        <property name="user" value="${user}"/>
        <property name="password" value="${password}"/>
        <property name="initialPoolSize" value="1"/>
        <property name="minPoolSize" value="1"/>    
        <property name="maxPoolSize" value="300"/>
        <property name="maxIdleTime" value="60"/>    
        <!-- 当连接池中的连接耗尽的时候c3p0一次同时获取的连接数。Default: 3  -->
        <property name="acquireIncrement" value="5"/>    
        <!-- 每60秒检查所有连接池中的空闲连接。Default: 0  -->
        <property name="idleConnectionTestPeriod" value="60"/>
    </bean>

    <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="persistenceXmlLocation" value="classpath:META-INF/persistence.xml" />
        <property name="loadTimeWeaver">
              <bean class="org.springframework.instrument.classloading.InstrumentationLoadTimeWeaver"/>
        </property>
    </bean> 
    
   <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="entityManagerFactory" ref="entityManagerFactory"/>
   </bean>
   
   <tx:annotation-driven transaction-manager="transactionManager"/>

package net.orc.service.base;

import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import org.springframework.transaction.annotation.Transactional;


@SuppressWarnings("unchecked")
@Transactional
public abstract class DaoSupport<T> implements DAO<T>{
    @PersistenceContext protected EntityManager em;
    public void save(T entity) {
        em.persist(entity);
    }
    
    public void update(T entity) {
        em.merge(entity);
    }
}