[Hibernate] - Annotations - One To Many
Hibernate使用Annotation的一对多:
hibernate.cfg.xml
<?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>
HibernateUtil.java
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;
} }
Java Beans
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;
}
}
测试:
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();
} }
[Hibernate] - Annotations - One To Many的更多相关文章
- [Hibernate] - Annotations - Many To Many
Hibernate annotation 多对多: 下面测试例子会自动生成一张表:card,这张是bank和user表的映射表.里头是bank_id和user_id两个组合字段. 如果想在这张映射表中 ...
- [Hibernate] - Annotations - One To One
Hibernate annotation 一对一的两种实现: 1)幅表中有主表的主键ID做为引用 2)幅表的主键即为主表的ID hibernate.cfg.xml <?xml version=& ...
- JavaPersistenceWithHibernate第二版笔记-第五章-Mapping value types-007UserTypes的用法(@org.hibernate.annotations.Type、@org.hibernate.annotations.TypeDefs、CompositeUserType、DynamicParameterizedType、、、)
一.结构 二.Hibernate支持的UserTypes接口 UserType —You can transform values by interacting with the plain JD ...
- JavaPersistenceWithHibernate第二版笔记-第五章-Mapping value types-005控制类型映射(Nationalized、@LOB、@org.hibernate.annotations.Type)
一.简介 1. 2. 3. 4. to override this default mapping. The JPA specification has a convenient shortcut a ...
- java.lang.ClassNotFoundException: org.hibernate.annotations.common.reflection.MetadataProvider
Caused by: java.lang.NoClassDefFoundError: org/hibernate/annotations/common/reflection/MetadataProvi ...
- BAE 环境下 hibernate annotations 配置
annotations 配置 首先需要加入 hibernate-jpa-2.0-api-1.0.1.Final.jar 和 ejb3-persistence.jar 这两个包 ejb3-persis ...
- Caused by: java.lang.ClassNotFoundException: org.hibernate.annotations.common.reflection.MetadataPro
1.错误描述 信息: MLog clients using java 1.4+ standard logging. 2014-7-12 19:29:20 com.mchange.v2.c3p0.C3P ...
- Hibernate Annotations 注解
Hibernate Annotations 注解 对于org.hibernate.annotations与org.hibernate.persistence,它的注释比如Columns,可是不知道怎么 ...
- [Hibernate] - Annotations
Hibernate使用Annotations最简单例子: hibernate.cfg.xml <?xml version="1.0" encoding="UTF-8 ...
随机推荐
- Http权威指南(一)---读书笔记
Chart1 ====概述==== 最简单的的资源是web服务器文件系统中的静态文件.当然可以上动态,但要经过网关?(不确定) 下面见图: 2. URI(uniform Resource Ident ...
- Shell 条件表达式汇总
条件表达式 文件表达式 if [ -f file ] 如果文件存在if [ -d ... ] 如果目录存在if [ -s file ] 如果文件存在且非空 if [ -r f ...
- Windows 10下Chrome不能启动的问题
不能启动了 Chrome突然不能启动了,点击图标也没反应,打开任务管理器,发现点击图标后,Google Ghrome短暂地出现,随即消失. 如何解决? 解决方案 打开安装目录: C:\Program ...
- 【转】How-To-Ask-Questions-The-Smart-Way
提问的智慧 How To Ask Questions The Smart Way Copyright © 2001,2006,2014 Eric S. Raymond, Rick Moen 本指南英文 ...
- 实战网卡bond
一.什么是网卡bond 所谓bond,就是把多个物理网卡绑定成一个逻辑上的网卡,使用同一个IP工作,在增加带宽的同时也可以提高冗余性,一般使用较多的就是来提高冗余,分别和不同交换机相连,提高可靠性,但 ...
- ZOJ 1042 W’s Cipher
原题链接 题目大意:按照规则解码.26个字母分成三组,每一组按照顺时针移位编码.现在已知移动的位数,要求解码. 解法:以前看过一本古典密码学的书,百度贴吧密码吧也有很多经典的加密方法,想什么凯撒移位. ...
- ES6-函数扩展
- leetcode 152. Maximum Product Subarray --------- java
Find the contiguous subarray within an array (containing at least one number) which has the largest ...
- JavaWeb学习记录(二十四)——获取插入数据后,自动生成的id值
public Integer insertObjects(final Goods entity) { // 定义sql语句 final String sql1 = "inser ...
- js获取客户端操作系统
function detectOS() { var sUserAgent = navigator.userAgent; var isWin = (navigator.platform == " ...