Hibernate 3.0 HelloWorld
说明
基于Hibernate 3.0，Mysql5.0，java jdk 1.7，运行需要的lib 库，从http://files.cnblogs.com/HCCZX/Hibernate_Lib.rar 下载。
下面开始一步步写代码
1.创建数据库
drop database if exists SAMPLEDB; create database SAMPLEDB; use SAMPLEDB; create table CUSTOMERS ( ID bigint not null primary key, NAME varchar(15) not null, EMAIL varchar(128) not null, PASSWORD varchar(8) not null, PHONE int , ADDRESS varchar(255), SEX char(1) , IS_MARRIED bit, DESCRIPTION text, IMAGE blob, BIRTHDAY date, REGISTERED_TIME timestamp );
2.添加java VO 对象，也叫 pojo,javabean，不知为啥这么多个叫法。
package mypack; import java.io.Serializable; import java.sql.Date; import java.sql.Timestamp; public class Customer implements Serializable { private static final long serialVersionUID = 1L; 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; private Date birthday; private Timestamp registeredTime; public Customer() { } public Long getId() { return id; } @SuppressWarnings("unused") private 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 this.image; } public void setImage(byte[] image) { this.image = image; } public Date getBirthday() { return this.birthday; } public void setBirthday(Date birthday) { this.birthday = birthday; } public Timestamp getRegisteredTime() { return this.registeredTime; } public void setRegisteredTime(Timestamp registeredTime) { this.registeredTime = registeredTime; } }
3.添加Hibernate 对象关系映射文件
<?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="mypack.Customer" table="CUSTOMERS"> <id name="id" column="ID" type="long"> <generator class="increment"/> </id> <property name="name" column="NAME" type="string" not-null="true" /> <property name="email" column="EMAIL" type="string" not-null="true" /> <property name="password" column="PASSWORD" type="string" not-null="true"/> <property name="phone" column="PHONE" type="int" /> <property name="address" column="ADDRESS" type="string" /> <property name="sex" column="SEX" type="character"/> <property name="married" column="IS_MARRIED" type="boolean"/> <property name="description" column="DESCRIPTION" type="text"/> <property name="image" column="IMAGE" type="binary"/> <property name="birthday" column="BIRTHDAY" type="date"/> <property name="registeredTime" column="REGISTERED_TIME" type="timestamp"/> </class> </hibernate-mapping>
4.添加Hibernate 配置文件 hibernate.properties
hibernate.dialect=org.hibernate.dialect.MySQLDialect hibernate.connection.driver_class=com.mysql.jdbc.Driver hibernate.connection.url=jdbc:mysql://localhost:3306/SAMPLEDB hibernate.connection.username=root hibernate.connection.password=aaaaaa hibernate.show_sql=true
5.添加底层操作代码
package mypack; import javax.servlet.*; import org.hibernate.*; import org.hibernate.cfg.Configuration; import java.io.*; import java.sql.Date; import java.util.*; public class BusinessService{ public static SessionFactory sessionFactory; /** 初始化Hibernate，创建SessionFactory实例 */ static{ try{ // 根据默认位置的Hibernate配置文件的配置信息，创建一个Configuration实例 Configuration config = new Configuration(); //加载Customer类的对象-关系映射文件 config.addClass(Customer.class); // 创建SessionFactory实例 */ sessionFactory = config.buildSessionFactory(); }catch(RuntimeException e){e.printStackTrace();throw e;} } /** 查询所有的Customer对象，然后调用printCustomer()方法打印Customer对象信息 */ public void findAllCustomers(ServletContext context,PrintWriter out) throws Exception{ Session session = sessionFactory.openSession(); //创建一个会话 Transaction tx = null; try { tx = session.beginTransaction(); //开始一个事务 Query query=session.createQuery("from Customer as c order by c.name asc"); @SuppressWarnings("unchecked") List<Customer> customers=query.list(); for (Iterator<Customer> it = customers.iterator(); it.hasNext();) { printCustomer(context,out,it.next()); } tx.commit(); //提交事务 }catch (RuntimeException e) { if (tx != null) { tx.rollback(); } throw e; } finally { session.close(); } } /** 持久化一个Customer对象 */ public void saveCustomer(Customer customer){ Session session = sessionFactory.openSession(); Transaction tx = null; try { tx = session.beginTransaction(); session.save(customer); tx.commit(); }catch (RuntimeException e) { if (tx != null) { tx.rollback(); } throw e; } finally { session.close(); } } /** 按照OID加载一个Customer对象，然后修改它的属性 */ public void loadAndUpdateCustomer(Long customer_id,String address){ Session session = sessionFactory.openSession(); Transaction tx = null; try { tx = session.beginTransaction(); Customer c=(Customer)session.get(Customer.class,customer_id); c.setAddress(address); tx.commit(); }catch (RuntimeException e) { if (tx != null) { tx.rollback(); } throw e; } finally { session.close(); } } /**删除Customer对象 */ public void deleteCustomer(Customer customer){ Session session = sessionFactory.openSession(); Transaction tx = null; try { tx = session.beginTransaction(); session.delete(customer); tx.commit(); }catch (RuntimeException e) { if (tx != null) { tx.rollback(); } throw e; } finally { session.close(); } } /** 选择向控制台还是Web网页输出Customer对象的信息 */ private void printCustomer(ServletContext context,PrintWriter out,Customer customer)throws Exception{ if(context!=null) printCustomerInWeb(context,out,customer); else printCustomer( out,customer); } /** 把Customer对象的信息输出到控制台，如DOS 控制台*/ private void printCustomer(PrintWriter out,Customer customer)throws Exception{ byte[] buffer=customer.getImage(); FileOutputStream fout=new FileOutputStream("photo_copy.gif"); fout.write(buffer); fout.close(); out.println("------以下是"+customer.getName()+"的个人信息------"); out.println("ID: "+customer.getId()); out.println("口令: "+customer.getPassword()); out.println("E-Mail: "+customer.getEmail()); out.println("电话: "+customer.getPhone()); out.println("地址: "+customer.getAddress()); String sex=customer.getSex()=='M'? "男":"女"; out.println("性别: "+sex); String marriedStatus=customer.isMarried()? "已婚":"未婚"; out.println("婚姻状况: "+marriedStatus); out.println("生日: "+customer.getBirthday()); out.println("注册时间: "+customer.getRegisteredTime()); out.println("自我介绍: "+customer.getDescription()); } /** 把Customer对象的信息输出到动态网页 */ private void printCustomerInWeb(ServletContext context,PrintWriter out,Customer customer)throws Exception{ //保存照片 byte[] buffer=customer.getImage(); String path=context.getRealPath("/"); FileOutputStream fout=new FileOutputStream(path+"photo_copy.gif"); fout.write(buffer); fout.close(); out.println("------以下是"+customer.getName()+"的个人信息------"+"<br>"); out.println("ID: "+customer.getId()+"<br>"); out.println("口令: "+customer.getPassword()+"<br>"); out.println("E-Mail: "+customer.getEmail()+"<br>"); out.println("电话: "+customer.getPhone()+"<br>"); out.println("地址: "+customer.getAddress()+"<br>"); String sex=customer.getSex()=='M'? "男":"女"; out.println("性别: "+sex+"<br>"); String marriedStatus=customer.isMarried()? "已婚":"未婚"; out.println("婚姻状况: "+marriedStatus+"<br>"); out.println("生日: "+customer.getBirthday()+"<br>"); out.println("注册时间: "+customer.getRegisteredTime()+"<br>"); out.println("自我介绍: "+customer.getDescription()+"<br>"); out.println("<img src='photo_copy.gif' border=0><p>"); } public void test(ServletContext context,PrintWriter out) throws Exception{ Customer customer=new Customer(); customer.setName("Tom"); customer.setEmail("[email protected]"); customer.setPassword("1234"); customer.setPhone(55556666); customer.setAddress("Shanghai"); customer.setSex('M'); customer.setDescription("I am very honest."); //设置Customer对象的image属性，它是字节数组，存放photo.gif文件中的二进制数据 //photo.gif文件和BusinessService.class文件位于同一个目录下 InputStream in=this.getClass().getResourceAsStream("photo.gif"); byte[] buffer = new byte[in.available()]; in.read(buffer); customer.setImage(buffer); //设置Customer对象的birthday属性，它是java.sql.Date类型 customer.setBirthday(Date.valueOf("1980-05-06")); saveCustomer(customer); findAllCustomers(context,out); loadAndUpdateCustomer(customer.getId(),"Beijing"); findAllCustomers(context,out); deleteCustomer(customer); } public static void main(String args[]) throws Exception { new BusinessService().test(null,new PrintWriter(System.out,true)); sessionFactory.close(); } }