【Hibernate】---【注解】一对多

<?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"><hibernate-configuration> ???<session-factory> ???????<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property> ???????<property name="hibernate.connection.password">root</property> ???????<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/test</property> ???????<property name="hibernate.connection.username">root</property> ???????????????<property name="hibernate.show_sql">true</property> ???????<property name="hibernate.format_sql">true</property> ???????<property name="hibernate.hbm2ddl.auto">update</property> ???????<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property> ???????<property name="current_session_context_class">thread</property> ???????<!-- ????????<mapping resource="com/chinasofti/entity/User.hbm.xml" /> ???????<mapping resource="com/chinasofti/entity/Role.hbm.xml" /> ???????--> ???????<mapping class="com.chinasofti.entity.User"/> ???????<mapping class="com.chinasofti.entity.Role"/> ???</session-factory></hibernate-configuration>

package com.chinasofti.entity;import java.util.HashSet;import java.util.Set;import javax.persistence.CascadeType;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.GenerationType;import javax.persistence.Id;import javax.persistence.OneToMany;import javax.persistence.Table;@Entity@Table(name="T_USER2")public class User { ???@Id ???@GeneratedValue(strategy=GenerationType.IDENTITY) ???private Integer user_id; ???private String user_name; ???private String user_password; ???????@OneToMany(mappedBy="user",cascade=CascadeType.REMOVE) ???private Set<Role> roles = new HashSet<Role>(); ????public Set<Role> getRoles() { ???????return roles; ???} ???public void setRoles(Set<Role> roles) { ???????this.roles = roles; ???} ???public Integer getUser_id() { ???????return user_id; ???} ???public void setUser_id(Integer user_id) { ???????this.user_id = user_id; ???} ???public String getUser_name() { ???????return user_name; ???} ???public void setUser_name(String user_name) { ???????this.user_name = user_name; ???} ???public String getUser_password() { ???????return user_password; ???} ???public void setUser_password(String user_password) { ???????this.user_password = user_password; ???} ???@Override ???public String toString() { ???????return "User [user_id=" + user_id + ", user_name=" + user_name ???????????????+ ", user_password=" + user_password + "]"; ???}}

package com.chinasofti.entity;import java.util.HashSet;import java.util.Set;import javax.persistence.CascadeType;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="T_ROLE2")public class Role { ???@Id ???@GeneratedValue(strategy=GenerationType.IDENTITY) ???private Integer role_id; ???private String role_name; ???private String role_memo; ???@ManyToOne ???@JoinColumn(name="user_id") ???private User user; ???public User getUser() { ???????return user; ???} ???public void setUser(User user) { ???????this.user = user; ???} ???public Integer getRole_id() { ???????return role_id; ???} ???public void setRole_id(Integer role_id) { ???????this.role_id = role_id; ???} ???public String getRole_name() { ???????return role_name; ???} ???public void setRole_name(String role_name) { ???????this.role_name = role_name; ???} ???public String getRole_memo() { ???????return role_memo; ???} ???public void setRole_memo(String role_memo) { ???????this.role_memo = role_memo; ???} ???@Override ???public String toString() { ???????return "Role [role_id=" + role_id + ", role_name=" + role_name ???????????????+ ", role_memo=" + role_memo + "]"; ???}}

package com.chinasofti.entity;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.cfg.Configuration;public class HibernateUtil { ???static Configuration CONFIGURATION = null; ???static SessionFactory SESSION_FACTORY = null; ???static Session SESSION = null; ???static{ ???????CONFIGURATION = new Configuration(); ???????CONFIGURATION.configure(); ???????SESSION_FACTORY = CONFIGURATION.buildSessionFactory(); ???????SESSION ???= SESSION_FACTORY.openSession(); ???} ???public static SessionFactory getSessionFactory(){ ???????return SESSION_FACTORY; ???} ???public static Session openSession(){ ???????return SESSION; ???}}

package com.chinasofti.entity;import org.hibernate.Session;import org.hibernate.Transaction;import org.junit.Test;public class TestAnnotation { ???????@Test ???public void removeRoleForUser(){ ???????Session session = HibernateUtil.openSession(); ???????Transaction transaction = session.beginTransaction(); ???????//先找到左冷禅 ???????//User zuolengchan = session.get(User.class, 1); ???????//再找到角色-掌门 ???????Role zhangmen = session.get(Role.class, 1); ???????session.delete(zhangmen); ???????//session.save(zuolengchan); ???????//session.update(zuolengchan); ???????transaction.commit(); ???????session.close(); ???} ???????@Test ???public void testAnnotationOneToMany(){ ???????Session session = HibernateUtil.openSession(); ???????Transaction transaction = session.beginTransaction(); ???????User user = new User(); ???????user.setUser_name("左冷禅"); ???????user.setUser_password("guniang"); ???????????????//角色 ???????Role role1 = new Role(); ???????role1.setRole_name("掌门"); ???????role1.setRole_memo("zhangmen"); ???????????????//角色 ???????Role role2 = new Role(); ???????role2.setRole_name("教主"); ???????role2.setRole_memo("jiaozhu"); ???????role1.setUser(user); ???????role2.setUser(user); ???????//给左冷禅添加角色 ???????user.getRoles().add(role1); ???????user.getRoles().add(role2); ???????????????//保存左冷禅-级联角色 ???????session.save(user); ???????transaction.commit(); ???????session.close(); ???}}