maven 项目（三）引申--spring集成hibernate+JPA事务配置（扫描注解）
一：spring集成hibernate+JPA事务配置
<?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:jee="http://www.springframework.org/schema/jee"
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/jee
http://www.springframework.org/schema/jee/spring-jee-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd"
default-lazy-init="true">
<description>Spring公共配置 </description>
<!-- 定义受环境影响易变的变量 -->
<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="systemPropertiesModeName" value="SYSTEM_PROPERTIES_MODE_OVERRIDE" />
<property name="ignoreResourceNotFound" value="true" />
<property name="locations">
<list>
<!-- 标准配置 :加载数据库配置文件-->
<value>classpath*:/resources/mysql.properties</value>
</list>
</property>
</bean>
<!-- 使用annotation 自动注册bean,并保证@Required,@Autowired的属性被注入 -->
<context:component-scan base-package="com.san" ></context:component-scan>
<!-- 数据源配置,使用应用内的DBCP数据库连接池 -->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<!-- Connection Info -->
<property name="driverClassName" value="${jdbc.driver}" />
<property name="url" value="${jdbc.url}" />
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
<!-- Connection Pooling Info -->
<property name="initialSize" value="${dbcp.initialSize}" />
<property name="maxActive" value="${dbcp.maxActive}" />
<property name="maxIdle" value="${dbcp.maxIdle}" />
<property name="validationQuery" value="select 1 from dual"/>
<property name="testOnBorrow" value="true" />
<property name="defaultAutoCommit" value="false" />
</bean>
<!-- 数据源配置,使用应用服务器的数据库连接池 -->
<!-- Hibernate配置 -->
<bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">${hibernate.dialect}</prop>
<prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
<prop key="hibernate.format_sql">${hibernate.format_sql}</prop>
<!-- 定义缓存设置目录，可以不要 -->
<prop key="hibernate.cache.provider_class">org.hibernate.cache.EhCacheProvider</prop><prop key="hibernate.cache.provider_configuration_file_resource_path">ehcache/ehcache-hibernate-local.xml</prop>
</props>
</property>
<!-- 扫描JPA -->
<property name="packagesToScan" value="com.san.console.entity" /><property name="namingStrategy">
<bean class="com.san.console.utils.ImprovedNamingStrategy"/>
</property>
</bean>
<!-- 事务管理器配置,单数据源事务 -->
<bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory" />
</bean>
<!-- 使用annotation定义事务 -->
<tx:annotation-driven transaction-manager="transactionManager" proxy-target-class="true" />
</beans>
二：还是贴出来数据库配置文件吧：mysql.properties
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/sandb?useUnicode=true&characterEncoding=UTF-8
jdbc.username=root
jdbc.password=root
hibernate.dialect=org.hibernate.dialect.MySQLDialect
#hibernate 要不要在日志中显示SQL语句
hibernate.show_sql=true
hibernate.format_sql=false
#数据库连接数
#dbcp settings
dbcp.initialSize=5
dbcp.maxActive=20
dbcp.maxIdle=10
1:数据库配置文件和spring配置文件分离：文件解耦；
2.jpa的好处之一：方便修改，有虚拟字段。拓展性感觉相比mybatis要差一点（仅仅代表个人观点）；
贴一段JPA的代码吧,读者请自学
附：
@Entity
@Table(name = "portal_topic")
public class PortalTopic {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Integer id;
@Column(name = "TITLE")
private String title;
******
}