Spring集成JPA(Hibernate实现)

Spring 集成 JPA(hibernate实现)

1)数据源 c3p0

<context:property-placeholder
	location="classpath:cn/com/legendapl/persistence/config/database.properties" />

<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
	<property name="driverClass" value="${jdbc.driverClass}" />
	<property name="jdbcUrl" value="${jdbc.url}" />
	<property name="user" value="${jdbc.username}" />
	<property name="password" value="${jdbc.password}" />
	<property name="minPoolSize" value="${c3p0.minPoolSize}" />
	<property name="maxPoolSize" value="${c3p0.maxPoolSize}" />
	<property name="initialPoolSize" value="${c3p0.initialPoolSize}" />
</bean>

2)EntityManagerFactory

<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
	<property name="dataSource" ref="dataSource" />
	<property name="jpaVendorAdapter">
		<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
			<property name="showSql" value="true" />
			<property name="generateDdl" value="true" />
		</bean>
	</property>
</bean>

3)事务管理器
标注或者xml方式随个人口味

<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
	<property name="dataSource" ref="dataSource" />
	<property name="entityManagerFactory" ref="entityManagerFactory" />
</bean>

<!--
<tx:advice id="txAdvice">
	<tx:attributes>
		<tx:method name="find*" read-only="true"/>
		<tx:method name="*" propagation="REQUIRED"/>
	</tx:attributes>
</tx:advice>

<aop:config>
	<aop:pointcut expression="execution(* *..dao.impl..*(..))" id="dao-pc"/>
	<aop:pointcut expression="execution(* *..service.impl..*(..))" id="service-pc"/>
	<aop:advisor advice-ref="txAdvice" pointcut-ref="dao-pc"/>
	<aop:advisor advice-ref="txAdvice" pointcut-ref="service-pc"/>
</aop:config>
-->

<tx:annotation-driven/>

4)异常转换
※要转换的组件上要加入@Repository标注

<bean class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor" />

5)classpath*:META-INF/persistence.xml

<?xml version="1.0"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence" version="1.0"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd"
>
	<persistence-unit name="hibernate" transaction-type="RESOURCE_LOCAL">
		<provider>org.hibernate.ejb.HibernatePersistence</provider>
		<class>cn.com.legendapl.persistence.domain.User</class>
		<properties>
			<property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect" />
			<!-- 
			<property name="hibernate.connection.driver_class" value="org.gjt.mm.mysql.Driver"/> 
			<property name="hibernate.connection.username" value="root"/>
			<property name="hibernate.connection.password" value="root"/>
			<property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/itcast?useUnicode=true&amp;characterEncoding=UTF-8"/>
			-->
			<property name="hibernate.max_fetch_depth" value="3" />
			<property name="hibernate.hbm2ddl.auto" value="update" />
			<property name="hibernate.jdbc.fetch_size" value="18" />
			<property name="hibernate.jdbc.batch_size" value="10" />
			<property name="hibernate.show_sql" value="true" />
			<property name="hibernate.format_sql" value="true" />
		</properties>
	</persistence-unit>
</persistence>

6)DaoImpl例 (片段)
不要在DaoImpl的方法中使用 emf.createEntityManager();
这样为手动控制事务，事务的配置失效。

@Repository
public class UserDaoImpl implements UserDao {

	@Resource(name = "entityManagerFactory")
	protected EntityManagerFactory emf;

	public void saveUser(User user) {
		EntityManager em = EntityManagerFactoryUtils.getTransactionalEntityManager(emf);
		em.persist(user);
		System.out.println(em.getFlushMode());
	}

	public User findUserById(Integer id) {
		EntityManager em = EntityManagerFactoryUtils.getTransactionalEntityManager(emf);
		return em.find(User.class, id);
	}
}

7)数据库信息
database.properties

#====================================================================================
# jdbc infomation
#   jdbc.dirverClass              : 驱动类名
#   jdbc.url                      : 数据库统一资源描述符
#   jdbc.username                 : 数据库登录用户名
#   jdbc.password                 : 数据库登录口令
#====================================================================================
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.url=jdbc\:mysql\://localhost\:3306/income
jdbc.username=root
jdbc.password=root
#====================================================================================
# c3p0 setting
#   c3p0.minPoolSize              : 连接池最小保存的连接数量
#   c3p0.maxPoolSize              : 连接池最大保存的连接数量
#   c3p0.initialPoolSize          : 连接池被创建时保存的连接数量
#   c3p0.maxIdleTime              : 连接的最大空闲时间，超时不被使用则丢弃
#   c3p0.acquireIncrement         : 当连接耗尽时每次申请的连接数量
#   c3p0.idleConnectionTestPeriod : 每间隔一定秒数秒检查所有连接池中的空闲连接
#   c3p0.acquireRetryAttempts     : 定义在从数据库获取新连接失败后重复尝试的次数
#====================================================================================
c3p0.minPoolSize=5
c3p0.maxPoolSize=30
c3p0.initialPoolSize=10
#c3p0.maxIdleTime=60
#c3p0.acquireIncrement=3
#c3p0.idleConnectionTestPeriod=60
#c3p0.acquireRetryAttempts=30
#c3p0.breakAfterAcquireFailure=true
#====================================================================================
# hibernate setting
#   hibernate.dialect             : 方言
#====================================================================================
hibernate.dialect=org.hibernate.dialect.MySQLDialect