Hibernate 再接触 ?一对多单向关联

package com.bjsxt.hibernate;import java.util.HashSet;import java.util.Set;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.Id;import javax.persistence.JoinColumn;import javax.persistence.OneToMany;import javax.persistence.Table;@Entity@Table(name="t_group")public class Group { ???private int id; ???private String name; ???private Set<User> users = new HashSet<User>(); ???@Id ???@GeneratedValue ???public int getId() { ???????return id; ???} ???public void setId(int id) { ???????this.id = id; ???} ???public String getName() { ???????return name; ???} ???public void setName(String name) { ???????this.name = name; ???} ???@OneToMany ???@JoinColumn(name="groupId") ???//不写这句话会产生中间表 ???public Set<User> getUsers() { ???????return users; ???} ???public void setUsers(Set<User> users) { ???????this.users = users; ???}}

package com.bjsxt.hibernate;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.Id;import javax.persistence.ManyToOne;import javax.persistence.Table;@Entity@Table(name="t_user")public class User { ???private int id; ???private String name; ???????????@Id ???@GeneratedValue ???public int getId() { ???????return id; ???} ???public void setId(int id) { ???????this.id = id; ???} ???public String getName() { ???????return name; ???} ???public void setName(String name) { ???????this.name = name; ???}}

<?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="com.bjsxt.hibernate.User" table="t_user"> ???????<id name="id"> ???????????<generator class="native"></generator> ???????</id> ???????????????<property name="name"></property> ???????????</class> ???</hibernate-mapping>

<?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="com.bjsxt.hibernate.Group" table="t_group"> ???????<id name="id"> ???????????<generator class="native"></generator> ???????</id> ???????????????<property name="name"></property> ???????<set name="users"> ???????????<key column="groupId"></key> ???????????<one-to-many class="com.bjsxt.hibernate.User"/> ???????</set> ???</class> ???</hibernate-mapping>

@Test ???public void testSchemaExport() { ???????new SchemaExport(new AnnotationConfiguration().configure()).create(false, true); ???}