hibernate(2):开始Hibernate之旅

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本例将使用struts2和hiberante开发,首选将struts2相关的jar包复制到web 工程的WebRoot\WEB-INF\lib目录下。

所需的JAR包如下图,

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然后将连接mysql数据库所需的驱动JAR包也同样复制到lib目录中

右击工程名 MyEclipse->Add Hibernate Capablities

弹出如下窗口,按如下勾选配置好,点击下一步

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接下去的两步可以不配置,去年勾选,即不配置数据库连接与创建session工厂。

点击完成后,会在lib包上出现很多hibernate相关的JAR包

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例子:下面尝试用hibernate将Person对象存入数据库中

hibernate.cfg.xml配置文件,用于配置数据库的相关连接信息

<?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">

<!-- Generated by MyEclipse Hibernate Tools.                   -->
<hibernate-configuration>

    <session-factory>
    	<property name="connection.url">jdbc:mysql://localhost:3306/hibernate</property><!--hibernte为数据库名-->
    	<property name="connection.username">root</property>
    	<property name="connection.password">123456</property>
    	<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
    	<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
    	<mapping resource="Person.hbm.xml"></mapping>
    </session-factory>

</hibernate-configuration>

 

HibernateUtil .java 用来获取session及关闭session

package com.hibernate.util;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class HibernateUtil {
	private static SessionFactory sessionFactory;
	static{
		try{
			sessionFactory = new Configuration().configure().buildSessionFactory();
		}catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	public static Session currentSession(){
		Session session = sessionFactory.openSession();
		return session;
	}
	
	public static void closeSession(Session session){
		session.close();
	}
}

 

 

 Person.java

package com.hibernate.model;

import java.sql.Date;

public class Person {
	private Integer id;
	private String username;
	private String password;
	private Integer age;
	private Date registerdate;
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	public Integer getAge() {
		return age;
	}
	public void setAge(Integer age) {
		this.age = age;
	}
	public Date getRegisterdate() {
		return registerdate;
	}
	public void setRegisterdate(Date sterregisterdatedate) {
		this.registerdate = sterregisterdatedate;
	}
}

 

Person对象对应的配置文件,同样放在src目录下。

<?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>
	<class name="com.hibernate.model.Person" table="person">
		<id name="id" column="id" type="int">
			<generator class="increment"></generator><!-- 主键ID的生成方式 -->
		</id>
		<property name="username" column="username" type="java.lang.String"></property>
		<property name="password" column="password" type="java.lang.String"></property>
		<property name="age" column="age" type="int"></property>
		<property name="registerdate" column="registerdate" type="date"></property>
	</class>
</hibernate-mapping>

 

Test.java 测试类

package com.hibernate.util;

import java.sql.Date;
import java.util.List;

import com.hibernate.model.Person;
import com.hibernate.persistence.DBPerson;

public class Test {
	public static void main(String[] args) {
		//实例化一个person
		Person person = new Person();
		person.setId(11);
		person.setAge(22);
		person.setPassword("1111");
		person.setUsername("hp");
		person.setRegisterdate(new Date(new java.util.Date().getTime()));
		DBPerson.save(person);  //保存
		
		//查找
		List list = DBPerson.getAll();
		for (int i = 0; i < list.size(); i++) {
			person = (Person) list.get(i);
			System.err.println(person.getId() + " " + person.getUsername()
					+ " " + person.getPassword() + " " + person.getAge() + " "
					+ person.getRegisterdate());
		}
	}
}

 

DBPerson.java  用于保存或查找person

package com.hibernate.persistence;

import java.util.List;

import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.Transaction;

import com.hibernate.model.Person;
import com.hibernate.util.HibernateUtil;

public class DBPerson {
	//保存person
	public static void save(Person person) {
		Session session = HibernateUtil.currentSession();
		Transaction tx = session.beginTransaction();
		try {
			session.save(person);
			tx.commit();
		} catch (Exception e) {
			System.out.println("新增用户失败");
			if (null != tx) {
				tx.rollback();
			}
		} finally {
			HibernateUtil.closeSession(session);
		}
	}
	//查找并返回所有person
	public static List getAll(){
		Session session = HibernateUtil.currentSession();
		Transaction tx = session.beginTransaction();
		List list = null;
		try {
			Query query = session.createQuery(" from Person");//hql语句
			list = query.list();
		} catch (Exception e) {
			System.out.println("查询用户失败");
			if (null != tx) {
				tx.rollback();
			}
		} finally {
			HibernateUtil.closeSession(session);
		}
		return list;
	}
	
	public static Person getPersonById(Integer id){
		Session session = HibernateUtil.currentSession();
		Transaction tx = session.beginTransaction();
		Person person = null;
		try {
			person = (Person) session.get(Person.class, id);
		} catch (Exception e) {
			System.out.println("查询用户失败");
			if (null != tx) {
				tx.rollback();
			}
		} finally {
			HibernateUtil.closeSession(session);
		}
		return person;
	}
	
	//删除
	public static void deletePerson(Person person){
		Session session = HibernateUtil.currentSession();
		Transaction tx = session.beginTransaction();
		try {
			session.delete(person);
			tx.commit();
		} catch (Exception e) {
			System.out.println("删除用户失败");
			if (null != tx) {
				tx.rollback();
			}
		} finally {
			HibernateUtil.closeSession(session);
		}
	}
	
	//更新
	public static void updatePerson(Person person){
		Session session = HibernateUtil.currentSession();
		Transaction tx = session.beginTransaction();
		try {
			session.update(person);
			tx.commit();
		} catch (Exception e) {
			System.out.println("更新用户失败");
			e.printStackTrace();
			if (null != tx) {
				tx.rollback();
			}
		} finally {
			HibernateUtil.closeSession(session);
		}
	}
}

 

 

最后在数据库中生成的纪录

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例2:演示多种数据类型之间匹配。

Customers(客户),有如下属性

create table customers(
    id bigint not null primary key,
    name varchar(15) not null,
    email varchar(128) not null,
    password varchar(128) not null,
    phone int,
    address varchar(255),
    sex char(1),
    is_married bit,
    description text,
    image blob,
    birthday date,
    registered_time timestamp
);

 

Customer.java

package com.hibernate.model;

import java.sql.Date;
import java.sql.Timestamp;

public class Customer {
	private Long id;
	private String name;
	private String email;
	private String password;
	private int phone;
	private String address;
	private char sex;
	private boolean married;
	private String description;
	private byte[] image; //blob类型一般用数组来表示
	private Date birthday;
	private Timestamp registeredTime;

	public Long getId() {
		return id;
	}

	public void setId(Long id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getEmail() {
		return email;
	}

	public void setEmail(String email) {
		this.email = email;
	}

	public String getPassword() {
		return password;
	}

	public void setPassword(String password) {
		this.password = password;
	}

	public int getPhone() {
		return phone;
	}

	public void setPhone(int phone) {
		this.phone = phone;
	}

	public String getAddress() {
		return address;
	}

	public void setAddress(String address) {
		this.address = address;
	}

	public char getSex() {
		return sex;
	}

	public void setSex(char sex) {
		this.sex = sex;
	}

	public boolean isMarried() {
		return married;
	}

	public void setMarried(boolean married) {
		this.married = married;
	}

	public String getDescription() {
		return description;
	}

	public void setDescription(String description) {
		this.description = description;
	}

	public byte[] getImage() {
		return image;
	}

	public void setImage(byte[] image) {
		this.image = image;
	}

	public Date getBirthday() {
		return birthday;
	}

	public void setBirthday(Date birthday) {
		this.birthday = birthday;
	}

	public Timestamp getRegisteredTime() {
		return registeredTime;
	}

	public void setRegisteredTime(Timestamp registeredTime) {
		this.registeredTime = registeredTime;
	}
}

 

 

<?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>
	<class name="com.hibernate.model.Customer" table="customers">
		<id name="id" column="id" type="long">
			<generator class="increment"></generator>
		</id>
		<property name="name" column="name" type="string" not-null="true"></property>
		<property name="email" column="email" type="string" not-null="true"></property>
		<property name="password" column="password" type="string" not-null="true"></property>
		<property name="phone" column="phone" type="int"></property>
		<property name="address" column="address" type="string"></property>
		<property name="sex" column="sex" type="character"></property>
		<property name="married" column="is_married" type="boolean"></property>
		<property name="description" column="description" type="text"></property>
		<property name="image" column="image" type="binary"></property>
		<property name="birthday" column="birthday" type="date"></property>
		<property name="registeredTime" column="registered_time" type="timestamp"></property>
	</class>
</hibernate-mapping>

  

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