jpa与spring整合
1：在Pom.xml中引入Spring框架
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0http://maven.apache.org/xsd/maven-4.0.0.xsd">
UTF-8
2：Spring整合
Jpa:EntityManagerFactory---->EntityManager
Hibernate：SessionFactory---->Session
3:applicationContext.xml的配置
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:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:jdbc="http://www.springframework.org/schema/jdbc"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.1.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.1.xsd
http://www.springframework.org/schema/jdbc
http://www.springframework.org/schema/jdbc/spring-jdbc-3.1.xsd
http://www.springframework.org/schema/aophttp://www.springframework.org/schema/aop/spring-aop-3.1.xsd">
<context:annotation-config>context:annotation-config>
<context:component-scan base-package="com.test">context:component-scan>
<bean name="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName"
value="com.microsoft.sqlserver.jdbc.SQLServerDriver">
property>
<property name="url"
value="jdbc:sqlserver://127.0.0.1:1433;databaseName=Java1503">
property>
<property name="username" value="sa">property>
<property name="password" value="">property>
bean>
<bean name="entityManagerFactory"
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="persistenceProviderClass"
value="org.apache.openjpa.persistence.PersistenceProviderImpl">
property>
<property name="packagesToScan" value="com.jpa.entity">
property>
<property name="jpaProperties">
<props>
<prop key="javax.persistence.jdbc.driver">
com.microsoft.sqlserver.jdbc.SQLServerDriver
prop>
<prop key="javax.persistence.jdbc.url">
jdbc:sqlserver://localhost:1433;DatabaseName=java1411;SelectMethod=cursor;
prop>
<prop key="javax.persistence.jdbc.user">saprop>
<prop key="javax.persistence.jdbc.password">prop>
<prop key="openjpa.jdbc.SynchronizeMappings">
buildSchema(ForeignKeys=true)
prop>
<prop key="openjpa.Log">SQL=TRACEprop>
<prop key="openjpa.ConnectionFactoryProperties">
PrettyPrint=true,PrettyPrintLineLength=72
prop>
<prop key="openjpa.ClassLoadEnhancement">falseprop>
<prop key="openjpa.DynamicEnhancementAgent">falseprop>
<prop key="openjpa.RuntimeUnenhancedClasses">
supported
prop>
props>
property>
bean>
<bean name="transactionManager"
class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory"
ref="entityManagerFactory">
property>
bean>
<tx:annotation-driven transaction-manager="transactionManager" />
beans>
4：事务归jpa控制。
/**
* 事务归jpa控制。
*
* @author ctd
*
*/
@Service
public classTestMain_2 {
@Autowired
private EntityManagerFactoryfactory;
public EntityManagerFactorygetFactory() {
return factory;
}
public void setFactory(EntityManagerFactoryfactory) {
this.factory = factory;
}
/**
* jpa与Spring结合的过程中。如果事务归jpa控制。
*
* 那么在方法互相调用中。EntityManager由于是用factory.createEntityManager来创建的
*
* 类似(hibernate中session =SessionFactory.openSession)
*
* 因此不同的方法中，获取的manager不是同一个对象。那么事务就不是相同的事务。
*
* 无法保证方法互相调用中事务的统一。
*
* 要保证事务的统一：
*
* 1：使用Spring的声明式事务来统一控制。jpa中不使用事务。
*
* 2：不使用Spring的声明式事务来控制，那么在方法调用过程中，要进行事务对象的传递。
*
*
* @return
*/
public boolean saveUser() {
EntityManagermanager = null;
EntityTransactiontx = null;
boolean flag = false;
try {
manager= factory.createEntityManager();
System.out.println("manager_1 = "+ manager);
tx= manager.getTransaction();
tx.begin();
GroupBeangroupBean = newGroupBean();
groupBean.setGroupid(new Integer(1));
groupBean.setGroupname("java组");
GroupUseruser_1 = newGroupUser();
user_1.setUserid(new Integer(10));
user_1.setUsername("用户1");
user_1.setGroupBean(groupBean);
GroupUseruser_2 = newGroupUser();
user_2.setUserid(new Integer(20));
user_2.setUsername("用户2");
user_2.setGroupBean(groupBean);
manager.persist(groupBean);
manager.persist(user_1);
int i = 10/0;
manager.persist(user_2);
tx.commit();
}catch(Exception e) {
e.printStackTrace();
tx.rollback();
}
return flag;
}
public static void main(String[] args) {
ApplicationContextcontext = newClassPathXmlApplicationContext(
"applicationContext.xml");
TestMain_2testMain_2 = (TestMain_2) context.getBean("testMain_2");
testMain_2.saveUser();
}
}
5：事务归Spring控制。
5.1：在配置文件中打开声明式事务的注解。
class="org.springframework.orm.jpa.JpaTransactionManager"> ref="entityManagerFactory"> /** * 事务归Spring声明式事务控制。 * * @author ctd * */ @Service @Transactional public classTestMain_3 { @PersistenceContext /** * @PersistenceContext，将创建的EntityManager放到上下文对象中。 * * 达到EntityManager在方法中共享效果 ==类似于Hibernate中的getCurrentSession的操作。 */ private EntityManager manager; public EntityManagergetEntityManager() { return manager; } public void setEntityManager(EntityManagermanager) { this.manager = manager; } @Autowired private UserDAO userdao; /** * 方法要受到声明式事务的管理：必须声明为public类型。 * * @return */ public boolean saveGroup() { boolean flag = false; try { System.out.println("saveGroup--->manager = " + manager); GroupBeangroupBean = newGroupBean(); groupBean.setGroupid(new Integer(1)); groupBean.setGroupname("java组"); manager.persist(groupBean); // 测试：相同类中相同的方法，事务是否一致性。 // this.saveUser(); // 测试：不同类中方法的调用，事务是否一致性 userdao.saveUser(); }catch(Exception e) { e.printStackTrace(); throw new RuntimeException(e); } return flag; } public void saveUser() { System.out.println("saveUser--->manager = " + manager); GroupBeangroupBean = (GroupBean) manager.find(GroupBean.class, new Integer(1)); GroupUseruser_1 = newGroupUser(); user_1.setUserid(new Integer(10)); user_1.setUsername("用户1"); user_1.setGroupBean(groupBean); GroupUseruser_2 = newGroupUser(); user_2.setUserid(new Integer(20)); user_2.setUsername("用户2"); user_2.setGroupBean(groupBean); manager.persist(user_1); int i = 10 / 0; manager.persist(user_2); } public static void main(String[] args) { ApplicationContextcontext = newClassPathXmlApplicationContext( "applicationContext.xml"); TestMain_3testMain_3 = (TestMain_3) context.getBean("testMain_3"); testMain_3.saveGroup(); } } 5.2：在代码中控制事务: