Spring data jpa 的事務與緩存優化

各配置文件如下：

applicationContext.xml

<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
    xmlns:context="http://www.springframework.org/schema/context"   
    xmlns:jdbc="http://www.springframework.org/schema/jdbc"    
    xmlns:jee="http://www.springframework.org/schema/jee" 
    xmlns:aop="http://www.springframework.org/schema/aop"  
    xmlns:tx="http://www.springframework.org/schema/tx"  
    xmlns:jpa="http://www.springframework.org/schema/data/jpa"  
    xsi:schemaLocation="  
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd  
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd  
        http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd  
        http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd  
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd  
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
        http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa.xsd"  
    default-lazy-init="true">

    <!--第一步-->
    <!--定義服務層代碼存放的包掃描路徑-->
	<context:component-scan base-package="com.jike.usermanage.service" />

    <!--第二步-->
    <!--定義實體的工廠bean-->
    <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <property name="persistenceUnitName" value="userPU" />
        <property name="persistenceXmlLocation" value="classpath:persistence.xml"></property>
    </bean>

    <!--第三步-->
    <!--定義事務管理器-->
    <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="entityManagerFactory" ref="entityManagerFactory"/>
    </bean>

    <!--第四步-->
    <!--定義repository接口的存放目錄-->
    <!--定義接口實現的後綴，通常用Impl-->
    <!--定義實體工廠的引用-->
    <!--定義事務管理器的引用-->
   	<jpa:repositories base-package="com.jike.usermanage.repository"
   					  repository-impl-postfix="Impl" 
   					  entity-manager-factory-ref="entityManagerFactory" 
   					  transaction-manager-ref="transactionManager"/>




    <!--第五步-->
    <!--聲明採用註解的方式申明事務-->
    <tx:annotation-driven transaction-manager="transactionManager"/>
   
	
	
	<tx:advice id="userAdvice" transaction-manager="transactionManager">	
	    <tx:attributes>	
	      <tx:method name="save*" propagation="REQUIRED" isolation="DEFAULT" read-only="false" rollback-for="UserNotFoundException" timeout="-1"/>	
	      <tx:method name="del*" propagation="REQUIRED"/>	
	      <tx:method name="update*" propagation="REQUIRED"/>	
	      <tx:method name="add*" propagation="REQUIRED"/>	
	      <tx:method name="find*" propagation="REQUIRED"/>	
	      <tx:method name="get*" propagation="REQUIRED"/>	
	      <tx:method name="apply*" propagation="REQUIRED"/>	
	    </tx:attributes>	
	</tx:advice>
	<aop:config>	
		<aop:pointcut id="userServiceMethod" expression="execution(* com.jike.usermanage.service.*.*(..))"/>	
		<aop:advisor pointcut-ref="userServiceMethod" advice-ref="userAdvice" />	
	</aop:config>



</beans>

persistence.xml

<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence" version="2.0">
	<persistence-unit name="userPU" transaction-type="RESOURCE_LOCAL">
        <!--jpa的提供者-->
		<provider>org.hibernate.ejb.HibernatePersistence</provider>
		<properties>
            <!--聲明數據庫連接的驅動-->
			<property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver"/>
            <!--jdbc數據庫的連接地址-->
			<property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/user_manage"/>
			<property name="hibernate.connection.username" value="root"/>
			<property name="hibernate.connection.password" value="123456"/>
            <!--配置方言-->
			<property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect"/>
            <!--激活查詢日誌功能-->
			<property name="hibernate.show_sql" value="true"/>
            <!--優雅地輸出Sql-->
			<property name="hibernate.format_sql" value="true"/>
			
            <!--添加一條解釋型標註-->
			<property name="hibernate.use_sql_comments" value="false"/>
            <!--配置如何根據java模型生成數據庫表結構,常用update,validate-->
			<property name="hibernate.hbm2ddl.auto" value="update"/>
		
			<property name="hibernate.cache.use_query_cache" value="true"/>
      		<property name="hibernate.cache.use_second_level_cache" value="true"/>
      		<property name="hibernate.cache.provider_class" value="org.hibernate.cache.EhCacheProvider"/>
      		<property name="hibernate.cache.region.factory_class" value="org.hibernate.cache.ehcache.EhCacheRegionFactory"/>
      		<property name="hibernate.cache.provider_configuration" value="classpath:ehcache.xml"/>


		
		</properties>
	</persistence-unit>
</persistence>

spring-mvc.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" 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/context 
http://www.springframework.org/schema/context/spring-context-3.0.xsd 
http://www.springframework.org/schema/mvc 
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">

	<!-- 自動掃描controller包下的所有類，使其認爲spring mvc的控制器 -->
	<context:component-scan base-package="com.jike.usermanage.controller" />


    <mvc:annotation-driven />

	<!-- 對模型視圖名稱的解析，即在模型視圖名稱添加前後綴 -->
	<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" p:prefix="/WEB-INF/pages/" p:suffix=".jsp" />


</beans>

ehcache.xml

<?xml version="1.0" encoding="UTF-8" ?>

<ehcache>
    <defaultCache
        maxElementsInMemory="50000"
        eternal="false"
        timeToIdleSeconds="120"
        timeToLiveSeconds="120"
        overflowToDisk="false"/>
        
     <cache name="entityCache" eternal="false" maxElementsInMemory="10000"
     	timeToIdleSeconds="60" timeToLiveSeconds="120" overflowToDisk="true" />

    <!-- settings per class -->
  <!--   <cache name="com.danielme.demo.springjpahib.Country"
        maxElementsInMemory="1000"
        eternal="false"
        timeToIdleSeconds="180"
        timeToLiveSeconds="180"
        overflowToDisk="false"/>--> 
</ehcache>

處理事務一般有兩種方式：

1. xml配置 如上。

2. 註解

@Transactional(isolation=Isolation.DEFAULT,propagation=Propagation.REQUIRED)
	@Override
	public User updateUser(User user) throws UserNotFound {
		User userUpdate = userRepository.findOne(user.getId());
		if (userUpdate==null)
			throw new UserNotFound();
		if (user.getName()!=null)
			userUpdate.setName(user.getName());
		
		if (user.getPhone()!=null)
			userUpdate.setPhone(user.getPhone());
		userRepository.save(userUpdate);
		return userUpdate;
	}

緩存的xml配置如上。

代碼書寫如下：

1. 實體類緩存：

@Cache(usage=CacheConcurrencyStrategy.READ_WRITE,region="entityCache")
@Cacheable(true)
@Entity
@Table(name="t_user")
public class User {


	@Id
	@GeneratedValue
	@Column(name="id_")
	private Integer id;	
	
	@Column(name="name_", length=60)
	private String name;
	
	@Column(name="phone_", length=11)
	private String phone;
	
	@Column(name="inCome_", precision=12, scale=2)
	private BigDecimal inCome;
	
	@Column(name="old_")
	private Integer old;
	
	@Column(name="worktimes_")
	private Integer worktime;	
	
	@OneToMany(fetch=FetchType.EAGER)
	private List<Interest> interests;
	
	public User(){
		
	}
	
	public User(Integer id, String name){
		
		this.id = id;
		this.name = name;
		
	}
  	
	public Integer getWorktime() {
		return worktime;
	}
	public void setWorktime(Integer worktime) {
		this.worktime = worktime;
	}
	public Integer getOld() {
		return old;
	}
	public void setOld(Integer old) {
		this.old = old;
	}
	public List<Interest> getInterests() {
		return interests;
	}
	public void setInterests(List<Interest> interests) {
		this.interests = interests;
	}
	public BigDecimal getInCome() {
		return inCome;
	}
	public void setInCome(BigDecimal inCome) {
		this.inCome = inCome;
	}
	
	
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}

	public String getPhone() {
		return phone;
	}
	public void setPhone(String phone) {
		this.phone = phone;
	}
	
	
	
}

2. 常用的查詢語句緩存：

public interface UserRepository extends JpaRepository<User,Integer>,JpaSpecificationExecutor<User>{
		

	public void add(User user);//添加	
	public User update(User user);//修改	
	public User addOrUpdate(User user);//添加或修改	
	public void delete(User user);//刪除
	public User findOne(Integer id);//查詢單個實體
	public List<User> findAll();//查找所有實體
	
	@Query(value="select u from User u where u.name like :name")
	@QueryHints(value={@QueryHint(name="org.hibernate.cacheable",value="true")})
	public List<User> findUserByName(@Param("name")String name);
	


 	
}