Hibernate 3.6.10 Review 01
很久没写blog , 很久没用hibernate 了. 有点生疏了.
Hibernate 3.6.10 的目录结构比之前 3.2 改了许多,让我都有点不习惯了.
|- documentation 文档资料
|- lib 支持类
|- jpa 强烈建议使用
|- optional 可选择 lib , 有连接池和缓存.
|- required 必须的支持 lib.
|- project
|- etc config file .
|- source code.
|- hibernate3.jar
包结构弄清晰了,开始下一步. 做些简单的回忆例子.
hibernate 的例子分两类,1. hbm配置, 2. 标注.
------------- begin hbm config.
hibernate.cfg.xml
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<!-- Database connection settings -->
<property name="connection.driver_class">org.h2.Driver</property>
<!-- save in memory
<property name="connection.url">jdbc:h2:mem:db1;DB_CLOSE_DELAY=-1;MVCC=TRUE</property>
-->
<!-- save in hard disk -->
<property name="connection.url">jdbc:h2:~/test</property>
<property name="connection.username">sa</property>
<property name="connection.password"/>
<!-- JDBC connection pool (use the built-in) -->
<property name="connection.pool_size">1</property>
<!-- SQL dialect -->
<property name="dialect">org.hibernate.dialect.H2Dialect</property>
<!-- Disable the second-level cache -->
<property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
<!-- Echo all executed SQL to stdout -->
<property name="show_sql">true</property>
<!-- Drop and re-create the database schema on startup
<property name="hbm2ddl.auto">update</property> -->
<mapping resource="com/demo/Event.hbm.xml"/>
</session-factory>
</hibernate-configuration>
Event.hbm.xml
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.demo">
<class name="Event" table="EVENTS">
<id name="id" column="EVENT_ID">
<generator class="increment"/>
</id>
<property name="date" type="timestamp" column="EVENT_DATE"/>
<property name="title"/>
</class>
</hibernate-mapping> Event.java
package com.demo;
import java.util.Date;
public class Event {
private Long id;
private String title;
private Date date;
public Event() {
// this form used by Hibernate
}
public Event(String title, Date date) {
// for application use, to create new events
this.title = title;
this.date = date;
}
public Long getId() {
return id;
}
private void setId(Long id) {
this.id = id;
}
public Date getDate() {
return date;
}
public void setDate(Date date) {
this.date = date;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
}
Create a test class , for test the CURD operation
package com.demo;
import java.util.Date;
import java.util.List;
import junit.framework.TestCase;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
/**
* Illustrates use of Hibernate native APIs.
*
* @author Steve Ebersole
*/
public class NativeApiIllustrationTest extends TestCase {
private SessionFactory sessionFactory;
@Override
protected void setUp() throws Exception {
// A SessionFactory is set up once for an application
sessionFactory = new Configuration()
.configure() // configures settings from hibernate.cfg.xml
.buildSessionFactory();
}
@Override
protected void tearDown() throws Exception {
if ( sessionFactory != null ) {
sessionFactory.close();
}
}
public void testBasicUsage() {
// create a couple of events...
Session session = sessionFactory.openSession();
session.beginTransaction();
session.save( new Event( "Our very first event!", new Date() ) );
session.save( new Event( "A follow up event", new Date() ) );
session.getTransaction().commit();
session.close();
// now lets pull events from the database and list them
session = sessionFactory.openSession();
session.beginTransaction();
List result = session.createQuery( "from Event" ).list();
for ( Event event : (List<Event>) result ) {
System.out.println( "Event (" + event.getDate() + ") : " + event.getTitle() );
}
session.getTransaction().commit();
session.close();
}
} Do not for get download H2 DB, H2 DB is for test .
----------- begin annotations
add to hibernate.cfg.xml
<mapping class="com.demo.Person" />Person.java
package com.demo;
import java.util.Date;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
@Entity
@Table(name = "Person")
public class Person {
private String id;
private String name;
private int age;
private Date birthday;
public Person() {
super();
}
public Person(String id, String name, int age, Date birthday) {
super();
this.id = id;
this.name = name;
this.age = age;
this.birthday = birthday;
}
@Id
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
@Column(name="name")
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Column(name="age")
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
@Column(name="birthday")
@Temporal(TemporalType.DATE)
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
} PersonTest.java
package com.demo;
import java.util.Date;
import java.util.List;
import junit.framework.TestCase;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
/**
* Illustrates use of Hibernate native APIs.
*
* @author Steve Ebersole
*/
public class PersonTest extends TestCase {
private SessionFactory sessionFactory;
@Override
protected void setUp() throws Exception {
// A SessionFactory is set up once for an application
sessionFactory = new Configuration()
.configure() // configures settings from hibernate.cfg.xml
.buildSessionFactory();
}
@Override
protected void tearDown() throws Exception {
if ( sessionFactory != null ) {
sessionFactory.close();
}
}
public void testBasicUsage() {
// create a couple of events...
Session session = sessionFactory.openSession();
session.beginTransaction();
session.save( new Person(String.valueOf(System.nanoTime()),"John",26,new Date()) );
session.save( new Person(String.valueOf(System.nanoTime()),"Mike",30,new Date()) );
session.getTransaction().commit();
session.close();
// now lets pull events from the database and list them
session = sessionFactory.openSession();
session.beginTransaction();
List result = session.createQuery( "from Person" ).list();
for ( Person person : (List<Person>) result ) {
System.out.println( "Person (" + person.getName() + ") : " + person.getAge() );
}
session.getTransaction().commit();
session.close();
}
}
It seems done . If any checked exception , please join in the JUnit 4 or check the problem in detail.