菜鸟学习hibernate笔记<四>

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hibernate

Hibernate Java XML Servlet .net

数据库中表的关联关系---one to one

数据库

CREATE TABLE `card` (
`cardid` int(11) NOT NULL auto_increment,
`cardnum` int(11) default NULL,

xml 代码

PRIMARY KEY (`cardid`)
) ENGINE=InnoDB DEFAULT CHARSET=gbk;

CREATE TABLE `user` (
`userid` int(11) NOT NULL auto_increment,
`username` varchar(32) default NULL,
PRIMARY KEY (`userid`)
) ENGINE=InnoDB DEFAULT CHARSET=gbk;

java 代码

public class User implements java.io.Serializable {
private Integer userid;
private String username;
private Card card;
public Card getCard() {
return card;
}
public void setCard(Card card) {
this.card = card;
}
public User() {
}
/** full constructor */
public User(String username) {
this.username = username;
}
public Integer getUserid() {
return this.userid;
}
public void setUserid(Integer userid) {
this.userid = userid;
}
public String getUsername() {
return this.username;
}
public void setUsername(String username) {
this.username = username;
}
}

xml 代码user.hbm.xml

xml version="1.0" encoding="utf-8"?>
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="org.eimhe.User" table="user">
<id name="userid" type="java.lang.Integer">
<column name="userid" />
<generator class="native" />
id>
<property name="username" type="java.lang.String">
<column name="username" length="20" />
property>
<one-to-one name="card" class="org.eimhe.Card" cascade="all">one-to-one>
class>
hibernate-mapping>

java 代码

public class Card implements java.io.Serializable {
private Integer cardid;
private Integer cardnum;
private User user;
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
public Card() {
}
/** full constructor */
public Card(Integer cardnum) {
this.cardnum = cardnum;
}
// Property accessors
public Integer getCardid() {
return this.cardid;
}
public void setCardid(Integer cardid) {
this.cardid = cardid;
}
public Integer getCardnum() {
return this.cardnum;
}
public void setCardnum(Integer cardnum) {
this.cardnum = cardnum;
}
}

xml 代码card.hbm.xml

xml version="1.0" encoding="utf-8"?>
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="org.eimhe.Card" table="card">
<id name="cardid" type="java.lang.Integer">
<column name="cardid" />
<generator class="foreign" >
<param name="property">userparam>
generator>
id>
<property name="cardnum" type="java.lang.Integer">
<column name="cardnum" />
property>
<one-to-one name="user" class="org.eimhe.User">one-to-one>
class>
hibernate-mapping>

java 代码

import org.hibernate.Session;
import org.hibernate.Transaction;
public class UserDAO {
public void save(User user)
{
Session session=HibernateSessionFactory.getSession();
Transaction tx=session.beginTransaction();
session.save(user);
tx.commit();
}
}

java 代码

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class addUser extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
User user=new User();
user.setUsername("zhangsan1");
Card card=new Card();
user.setCard(card);
card.setCardnum(new Integer(9));
card.setUser(user);
UserDAO userdao=new UserDAO();
userdao.save(user);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request,response);
}
}

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菜鸟学习hibernate笔记<五> | 菜鸟学习hibernate笔记<三>

2007-05-14 21:33
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