http://tianya23.blog.51cto.com/1081650/275301
Spring整合Hibernate
由于Spring和Hibernate处于不同的层次，Spring关心的是业务逻辑之间的组合关系，Spring提供了对他们的强大的管理能力， 而Hibernate完成了OR的映射，使开发人员不用再去关心SQL语句，直接与对象打交道。 将Hibernate做完映射之后的对象交给Spring来管理是再合适不过的事情了， Spring也同时提供了对Hibernate的SessionFactory的集成功能。实例如下：
1、首先Hibernate完成OR映射功能
Person.java 【注意：必须要保留一个无参的构造方法】
public
class Person {
private Integer id;
private String name;
public
Person(){}
public Person(String name) {
this.name = name;
}
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;
}
}
完成从对象到数据库字段的对应关系的映射配置：Person.hbm.xml
<?
xml
version
="1.0"
encoding
="UTF-8"
?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<
hibernate-mapping
package
="cn.comp.bean"
>
<
class
name
="Person"
table
="person"
>
<
cache
usage
="read-write"
region
="cn.comp.bean.Person"
/>
<
id
name
="id"
>
<
generator
class
="native"
/>
</
id
>
<
property
name
="name"
length
="10"
not-null
="true"
/>
</
class
>
</
hibernate-mapping
>
2、让Hibernate完成后的对象交给Spring来管理
配置Hibernate与Spring的关系：beans.xml
<?
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:aop
="http://www.springframework.org/schema/aop"
xmlns:tx
="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd"
>
<
context:annotation-config
/>
<
bean
id
="dataSource"
class
="org.apache.commons.dbcp.BasicDataSource"
destroy-method
="close"
>
<
property
name
="driverClassName"
value
="org.gjt.mm.mysql.Driver"
/>
<
property
name
="url"
value
="jdbc:mysql://localhost:3306/dbname?useUnicode=true&characterEncoding=UTF-8"
/>
<
property
name
="username"
value
="root"
/>
<
property
name
="password"
value
="123456"
/>
<!--
连接池启动时的初始值 -->
<
property
name
="initialSize"
value
="1"
/>
<!--
连接池的最大值 -->
<
property
name
="maxActive"
value
="500"
/>
<!--
最大空闲值.当经过一个高峰时间后，连接池可以慢慢将已经用不到的连接慢慢释放一部分，一直减少到maxIdle为止 -->
<
property
name
="maxIdle"
value
="2"
/>
<!--
最小空闲值.当空闲的连接数少于阀值时，连接池就会预申请去一些连接，以免洪峰来时来不及申请 -->
<
property
name
="minIdle"
value
="1"
/>
</
bean
>
<
bean
id
="sessionFactory"
class
="org.springframework.orm.hibernate3.LocalSessionFactoryBean"
>
<
property
name
="dataSource"
ref
="dataSource"
/>
<
property
name
="mappingResources"
>
<
list
>
<
value
>cn/itcast/bean/Person.hbm.xml
</
value
>
</
list
>
</
property
>
<
property
name
="hibernateProperties"
>
<
value
>
hibernate.dialect=org.hibernate.dialect.MySQL5Dialect
hibernate.hbm2ddl.auto=update
hibernate.show_sql=false
hibernate.format_sql=false
hibernate.cache.use_second_level_cache=true
hibernate.cache.use_query_cache=false
hibernate.cache.provider_class=org.hibernate.cache.EhCacheProvider
</
value
>
</
property
>
</
bean
>
<
bean
id
="txManager"
class
="org.springframework.orm.hibernate3.HibernateTransactionManager"
>
<
property
name
="sessionFactory"
ref
="sessionFactory"
/>
</
bean
>
<
tx:annotation-driven
transaction-manager
="txManager"
/>
<
bean
id
="personService"
class
="cn.comp.service.impl.PersonServiceBean"
/>
<
bean
id
="personList"
class
="cn.comp.web.PersonAction"
/>
</
beans
>
PersonService.java
public
interface PersonService {
public
void save(Person person);
public
void update(Person person);
public Person getPerson(Integer personid);
public
void delete(Integer personid);
public List<Person> getPersons();
}
PersonServiceBean.java
@Transactional
public
class PersonServiceBean
implements PersonService {
@Resource
private SessionFactory sessionFactory;
public
void save(Person person){
sessionFactory.getCurrentSession().persist(person);
}
public
void update(Person person){
sessionFactory.getCurrentSession().merge(person);
}
@Transactional(propagation=Propagation.NOT_SUPPORTED,readOnly=
true)
public Person getPerson(Integer personid){
return (Person)sessionFactory.getCurrentSession().get(Person.
class, personid);
}
public
void delete(Integer personid){
sessionFactory.getCurrentSession().delete(
sessionFactory.getCurrentSession().load(Person.
class, personid));
}
@Transactional(propagation=Propagation.NOT_SUPPORTED,readOnly=
true)
@SuppressWarnings(
"unchecked")
public List<Person> getPersons(){
return sessionFactory.getCurrentSession().createQuery(
"from Person").list();
}
}
3、完成对实现类的测试
PersonServiceTest.java
public
class PersonServiceTest {
private
static PersonService personService;
@BeforeClass
public
static
void setUpBeforeClass()
throws Exception {
try {
ApplicationContext applicationContext =
new ClassPathXmlApplicationContext(
"beans.xml");
personService = (PersonService)applicationContext.getBean(
"personService");
}
catch (RuntimeException e) {
e.printStackTrace();
}
}
@Test
public
void testSave() {
personService.save(
new Person(
"小张"));
}
@Test
public
void testUpdate() {
Person person = personService.getPerson(1);
//....
person.setName(
"小丽");
personService.update(person);
}
@Test
public
void testGetPerson() {
Person person = personService.getPerson(2);
System.out.println(person.getName());
try {
System.out.println(
"请关闭数据库");
Thread.sleep(1000*15);
}
catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println(
"第二次开始获取");
person = personService.getPerson(2);
System.out.println(person.getName());
}
@Test
public
void testDelete() {
personService.delete(1);
}
@Test
public
void testGetPersons() {
List<Person> persons = personService.getPersons();
for(Person person : persons){
System.out.println(person.getName());
}
}
}
4、附件
中间使用到DBCP作为数据库连接缓存，关于其性能参考本文章的附件部分
