<?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">com.mysql.jdbc.Driver</property>

        <property name="connection.url">jdbc:mysql://127.0.0.1/testdb</property>

        <property name="connection.username">root</property>

        <property name="connection.password"></property>

        <!-- JDBC connection pool (use the built-in) -->

        <property name="connection.pool_size">1</property>

        <!-- SQL dialect -->

        <property name="dialect">org.hibernate.dialect.MySQL5Dialect</property>

        <!-- Enable Hibernate's automatic session context management -->

        <property name="current_session_context_class">thread</property>

        <!-- Disable the second-level cache  -->

        <property name="cache.provider_class">org.hibernate.cache.internal.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 class="com.my.bean.User"/>

        <mapping class="com.my.bean.UserCard"/>

    </session-factory>

</hibernate-configuration>

package com.my.dao.util;

import org.hibernate.SessionFactory;

import org.hibernate.boot.registry.StandardServiceRegistryBuilder;

import org.hibernate.cfg.Configuration;

public class HibernateUtil {

    private static final SessionFactory sessionFactory = buildSessionFactory();

    private static SessionFactory buildSessionFactory() {

        try {

            // Create the SessionFactory from hibernate.cfg.xml

            Configuration configuration = new Configuration();

            return configuration.configure().buildSessionFactory(

                    new StandardServiceRegistryBuilder().applySettings(configuration.getProperties()).build());

        } catch (Throwable ex) {

            // Make sure you log the exception, as it might be swallowed

            System.err.println("Initial SessionFactory creation failed." + ex);

            throw new ExceptionInInitializerError(ex);

        }

    }

    public static SessionFactory getSessionFactory() {

        return sessionFactory;

    }

}

package com.my.bean;

import java.util.Date;

import java.util.Set;

import javax.persistence.CascadeType;

import javax.persistence.Column;

import javax.persistence.Entity;

import javax.persistence.GeneratedValue;

import javax.persistence.Id;

import javax.persistence.OneToMany;

import javax.persistence.Table;

@Entity

@Table(name="user")

public class User {

    @Id @GeneratedValue @Column(name="user_id", nullable=false)

    private long userID;

    @Column(name="user_name", length=100, nullable=false)

    private String userName;

    @Column(name="create_time", nullable=false)

    private Date createTime;

    @OneToMany(mappedBy="user", cascade=CascadeType.ALL)

    private Set<UserCard> cards;

    public long getUserID() {

        return userID;

    }

    public void setUserID(long userID) {

        this.userID = userID;

    }

    public String getUserName() {

        return userName;

    }

    public void setUserName(String userName) {

        this.userName = userName;

    }

    public Date getCreateTime() {

        return createTime;

    }

    public void setCreateTime(Date createTime) {

        this.createTime = createTime;

    }

    public Set<UserCard> getCards() {

        return cards;

    }

    public void setCards(Set<UserCard> cards) {

        this.cards = cards;

    }

}

package com.my.bean;

import javax.persistence.CascadeType;

import javax.persistence.Column;

import javax.persistence.Entity;

import javax.persistence.GeneratedValue;

import javax.persistence.GenerationType;

import javax.persistence.Id;

import javax.persistence.JoinColumn;

import javax.persistence.ManyToOne;

import javax.persistence.Table;

@Entity

@Table(name="user_card")

public class UserCard {

    @Id

    @GeneratedValue(strategy=GenerationType.IDENTITY)

    @Column(name="card_id")

    private long cardID;

    @Column(name="card_name")

    private String CardName;

    @ManyToOne(cascade=CascadeType.ALL)

    @JoinColumn(name="user_id")

    private User user;

    public long getCardID() {

        return cardID;

    }

    public void setCardID(long cardID) {

        this.cardID = cardID;

    }

    public String getCardName() {

        return CardName;

    }

    public void setCardName(String cardName) {

        CardName = cardName;

    }

    public User getUser() {

        return user;

    }

    public void setUser(User user) {

        this.user = user;

    }

}

package com.my.init;

import java.util.Date;

import java.util.HashSet;

import org.hibernate.Session;

import org.hibernate.Transaction;

import com.my.bean.User;

import com.my.bean.UserCard;

import com.my.dao.util.HibernateUtil;

public class Test {

    public static void main(String[] args) {

        Session session = HibernateUtil.getSessionFactory().openSession();

        Transaction tx = session.beginTransaction();

        try {

            //---------------------------------------------------

            // add user

            //---------------------------------------------------

            User user = new User();

            user.setUserName("Robin");

            user.setCreateTime(new Date());

            user.setCards(new HashSet<UserCard>());

            //---------------------------------------------------

            // add card

            //---------------------------------------------------

            UserCard cardBBC = new UserCard();

            cardBBC.setCardName("BCC");

            cardBBC.setUser(user);

            UserCard cardCBC = new UserCard();

            cardCBC.setCardName("CBC");

            cardCBC.setUser(user);

            // add cards to user

            user.getCards().add(cardBBC);

            user.getCards().add(cardCBC);

            //---------------------------------------------------

            // save

            //--------------------------------------------------

            session.save(user);

            //---------------------------------------------------

            // remove user

            //---------------------------------------------------

            session.delete(user);

            tx.commit();

        } catch (Exception e) {

            tx.rollback();

            e.printStackTrace();

        }

        session.close();

    }

}