Hibernate学习笔记（一）

使用maven执行如下命令，创建项目骨架

mvn archetype:generate -DgroupId=org.hibernate.tutorials -DartifactId=hibernate-tutorial 
-DarchetypeArtifactId=maven-archetype-webapp

项目结构如下

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
    http://maven.apache.org/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>org.hibernate.tutorials</groupId>
    <artifactId>hibernate-tutorial</artifactId>
    <packaging>war</packaging>
    <version>1.0-SNAPSHOT</version>
    <name>First Hibernate Tutorial</name>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>
    <build>
        <finalName>${project.artifactId}</finalName>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.1</version>
                <configuration>
                    <source>1.5</source>
                    <target>1.5</target>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-resources-plugin</artifactId>
                <version>2.6</version>
                <configuration>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>
        </plugins>
    </build>
    <dependencies>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>3.6.9.Final</version>
        </dependency>
        <!-- for JPA, use hibernate-entitymanager instead of hibernate-core -->
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-entitymanager</artifactId>
            <version>3.6.9.Final</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-ehcache</artifactId>
            <version>3.6.9.Final</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-simple</artifactId>
            <version>1.7.7</version>
        </dependency>
        <dependency>
            <groupId>javassist</groupId>
            <artifactId>javassist</artifactId>
            <version>3.9.0.GA</version>
        </dependency>
        <dependency>
            <groupId>org.postgresql</groupId>
            <artifactId>postgresql</artifactId>
            <version>9.3-1101-jdbc41</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.8.1</version>
            <scope>test</scope>
        </dependency>
    </dependencies>
</project>

实体类

Event.java

package org.hibernate.domain;
import java.util.Date;
/**
 * Created by yaoli on 2014/6/17 0017.
 */
public class Event {
    private String id;
    private String title;
    private Date date;
    public Event() {
    }
    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    public String getTitle() {
        return title;
    }
    public void setTitle(String title) {
        this.title = title;
    }
    public Date getDate() {
        return date;
    }
    public void setDate(Date date) {
        this.date = date;
    }
}

实体类映射文件

Event.hbm.xml

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="org.hibernate.tutorial.domain">
    <class name="org.hibernate.domain.Event" table="EVENTS">
        <id name="id" column="EVENT_ID">
            <generator class="uuid"/>
        </id>
        <property name="date" type="timestamp" column="EVENT_DATE"/>
        <property name="title"/>
    </class>
</hibernate-mapping>

Hibernate配置文件

hibernate.cfg.xml

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
        <hibernate-configuration>
    <session-factory>
        <property name="connection.driver_class">org.postgresql.Driver</property>
        <property name="connection.url">jdbc:postgresql://localhost:5432/hibernate?characterEncoding=UTF-8</property>
        <property name="connection.username">postgres</property>
        <property name="connection.password">admin</property>
        <property name="connection.pool_size">1</property>
        <property name="dialect">org.hibernate.dialect.PostgreSQLDialect</property>
        <property name="current_session_context_class">thread</property>
        <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
        <property name="show_sql">true</property>
        <property name="hbm2ddl.auto">update</property>
        <mapping resource="org/hibernate/tutorial/domain/Event.hbm.xml"/>
    </session-factory>
</hibernate-configuration>

SessionFactory工具类

HibernateUtil.java

package org.hibernate.tutorial.util;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
/**
 * Created by yaoli on 2014/6/17 0017.
 */
public class HibernateUtil {
    private static final SessionFactory sessionFactory= buildSessionFactory();
    private static SessionFactory buildSessionFactory(){
        try {
            return new Configuration().configure().buildSessionFactory();
        } catch (Throwable ex){
            System.err.println("Initial SessionFactory creation failed "+ ex);
            throw new ExceptionInInitializerError(ex);
        }
    }
    public static SessionFactory getSessionFactory(){
        return sessionFactory;
    }
}

主类

EventManager.java

package org.hibernate.tutorial;
import org.hibernate.Session;
import org.hibernate.domain.Event;
import org.hibernate.tutorial.util.HibernateUtil;
import java.util.Date;
import java.util.List;
public class EventManager {
    public static void main(String[] args){
        EventManager mgr = new EventManager();
        if (args[0].equals("store")){
            mgr.createAndStoreEvent("My Event", new Date());
        } else if (args[0].equals("list")){
            List events = mgr.listEvent();
            for (int i = 0; i < events.size(); i++){
                Event theEvent = (Event) events.get(i);
                System.out.println("Event: "+theEvent.getTitle()+"Time:"+theEvent.getDate());
            }
        }
        HibernateUtil.getSessionFactory().close();
    }
    private void createAndStoreEvent(String title, Date theDate){
        Session session = HibernateUtil.getSessionFactory().getCurrentSession();
        session.beginTransaction();
        Event theEvent = new Event();
        theEvent.setTitle(title);
        theEvent.setDate(theDate);
        session.save(theEvent);
        session.getTransaction().commit();
    }
    private List listEvent(){
        Session session = HibernateUtil.getSessionFactory().getCurrentSession();
        session.beginTransaction();
        List result = session.createQuery("from Event ").list();
        session.getTransaction().commit();
        return result;
    }
}

执行如下命令执行代码

mvn exec:java -Dexec.mainClass="org.hibernate.tutorial.EventManager" -Dexec.args="list"