spring+jpa+hibernate

org.hibernate
hibernate-entitymanager
4.2.8.Final






2. spring-jpa-hibernate.xml

xmlns:xsi&＃61;"http://www.w3.org/2001/XMLSchema-instance"
xmlns:context&＃61;"http://www.springframework.org/schema/context"
xmlns:aop&＃61;"http://www.springframework.org/schema/aop"
xmlns:tx&＃61;"http://www.springframework.org/schema/tx"
xsi:schemaLocation&＃61;"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/aop
http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.2.xsd">




















3. 在类路径下创建文件夹“META-INF”&＃xff0c; 加入文件persistence.xml。 完整的路径是 classpath:META-INF/persistence.xml, 这是jpa的默认配置文件。

xsi:schemaLocation&＃61;"http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd" version&＃61;"2.0">



















4. Entity对象


package com.myproject.example.vo;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
&＃64;Entity
public class Account {
&＃64;Id
&＃64;GeneratedValue //generated automatically
private long id;
&＃64;Column(length&＃61;20, nullable&＃61;false)
private String username;
&＃64;Column(length&＃61;20, nullable&＃61;false)
private String password;
public long getId() {
return id;
}
public void setId(long id) {
this.id &＃61; id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username &＃61; username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password &＃61; password;
}
}






5.Dao文件


package com.myproject.example.dao.jpa;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;
import org.springframework.stereotype.Repository;
import com.myproject.example.dao.AccountDao;
import com.myproject.example.vo.Account;
&＃64;Repository
public class AccountDaoBean implements AccountDao {
&＃64;PersistenceContext
EntityManager em;
&＃64;Override
public Account queryAccountById(int id) {
return em.find(Account.class, id);
}
&＃64;SuppressWarnings("unchecked")
&＃64;Override
public List queryAccount(Account account) {
Query q &＃61; em.createQuery("select a from Account a where a.username like ?");
q.setParameter(1, "%"&＃43;account.getUsername()&＃43;"%");
return q.getResultList();
}
&＃64;Override
public int updateAccount(Account account) {
em.merge(account);
return 0;
}
&＃64;Override
public int insertAccount(Account account) {
em.persist(account);
return 0;
}
&＃64;Override
public int deleteAccount(int id) {
em.remove(em.getReference(Account.class, id));
return 0;
}
}






6. Service对象包含事务管理


package com.myproject.example.service;
import java.util.List;
import javax.annotation.Resource;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;
import com.myproject.example.dao.AccountDao;
import com.myproject.example.vo.Account;
&＃64;Service
&＃64;Transactional
public class AccountService {
&＃64;Resource
private AccountDao accountDao;
//don&＃39;t need to add transaction in query method
&＃64;Transactional(propagation&＃61;Propagation.NOT_SUPPORTED)
public Account Login(String username, String password){
System.out.println(username &＃43; " want to login.");
Account account &＃61; new Account();
account.setUsername(username);
account.setPassword(password);
List list&＃61; accountDao.queryAccount(account);
if(list.size()&＃61;&＃61;1)
return list.get(0);
else
return null;
}
//in method which already has "throws", we must add rollbackFor if want to rollback for this exception,
//otherwise the method will not be rollback
&＃64;Transactional(rollbackFor&＃61;Exception.class)
public void reqister(Account account) {
accountDao.insertAccount(account);
//throw new RuntimeException("&＃61;&＃61;no register");
}
}






7.web.xml

xmlns&＃61;"http://java.sun.com/xml/ns/javaee"
xmlns:xsi&＃61;"http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation&＃61;"http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">


contextConfigLocation
classpath:spring.xml



org.springframework.web.context.ContextLoaderListener


springmvc

org.springframework.web.servlet.DispatcherServlet


contextConfigLocation
classpath:springmvc.xml

1


springmvc
*.do


/jsp/index.jsp



openEntityManagerInViewFilter
org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter


openEntityManagerInViewFilter
/*









8.单元测试


&＃64;Test
public void test(){
try {
ApplicationContext ac&＃61;new ClassPathXmlApplicationContext("spring-jpa-hibernate.xml");
AccountService accountService &＃61;(AccountService)ac.getBean("accountService");
Account account &＃61; new Account();
account.setUsername("tom");
account.setPassword("117");
accountService.reqister(account);
} catch (Exception e) {
e.printStackTrace();
}
}