我是根据huihoo的教程来做的，可是更新的时候有点问题。代码如下：
company与person的关系是one-to-many 的关系。
company：
public class Company implements Serializable {
/** identifier field */
private String id;
/** nullable persistent field */
private String name;
private Set employees;
/** full constructor */
public Company(java.lang.String name) {
this.name = name;
}
/** default constructor */
public Company() {
}
public java.lang.String getId() {
return this.id;
}
public void setId(java.lang.String id) {
this.id = id;
}
public java.lang.String getName() {
return this.name;
}
public void setName(java.lang.String name) {
this.name = name;
}
public void setEmployees(Set value) {
this.employees=value;
}
public Set getEmployees() {
return employees;
}
public void addEmployee(hh.Person value) {
employees.add(value);
}
public void removeEmployee(hh.Person value) {
employees.remove(value);
}
public void clearEmployees() {
employees.clear();
}
public String toString() {
return new ToStringBuilder(this)
.append("id", getId())
.toString();
}
public boolean equals(Object other) {
if ( !(other instanceof Company) ) return false;
Company castOther = (Company) other;
return new EqualsBuilder()
.append(this.getId(), castOther.getId())
.isEquals();
}
public int hashCode() {
return new HashCodeBuilder()
.append(getId())
.toHashCode();
}
}
///////////////////////////////////////////////
person代码：
public class Person implements Serializable {
/** identifier field */
private String id;
/** nullable persistent field */
private String name;
/** nullable persistent field */
private String address;
/** nullable persistent field */
private String company_id;
/** full constructor */
public Person(java.lang.String name, java.lang.String address, java.lang.String company_id) {
this.name = name;
this.address = address;
this.company_id = company_id;
}
/** default constructor */
public Person() {
}
public java.lang.String getId() {
return this.id;
}
public void setId(java.lang.String id) {
this.id = id;
}
public java.lang.String getName() {
return this.name;
}
public void setName(java.lang.String name) {
this.name = name;
}
public java.lang.String getAddress() {
return this.address;
}
public void setAddress(java.lang.String address) {
this.address = address;
}
public java.lang.String getCompany_id() {
return this.company_id;
}
public void setCompany_id(java.lang.String companyId) {
this.company_id = companyId;
}
public String toString() {
return new ToStringBuilder(this)
.append("id", getId())
.toString();
}
public boolean equals(Object other) {
if ( !(other instanceof Person) ) return false;
Person castOther = (Person) other;
return new EqualsBuilder()
.append(this.getId(), castOther.getId())
.isEquals();
}
public int hashCode() {
return new HashCodeBuilder()
.append(getId())
.toHashCode();
}
}
////////////////////////////////
Company.hbm.xml：
<?xml version="1.0" encoding="GB2312"?>
<!DOCTYPE hibernate-mapping SYSTEM "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd" >
<hibernate-mapping>
<class name="hh.Company">
<!--hibernate为我们生成主键id-->
<id name = "id" unsaved-value = "null">
<generator class="uuid.hex"/>
</id>
<property name="name"/>
<!--1:n关系的映射-->
<set name="employees" cascade="all" inverse="true" lazy="true">
<key column="company_id"/>
<one-to-many class="hh.Person"/>
</set>
</class>
</hibernate-mapping>
//////////////////////////////////
Person.hbm.xml
<?xml version="1.0" encoding="GB2312"?>
<!DOCTYPE hibernate-mapping SYSTEM "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd" >
<hibernate-mapping>
<class name="hh.Person">
<!--hibernate为我们生成主键id-->
<id name = "id" unsaved-value = "null">
<generator class="uuid.hex"/>
</id>
<!--默认把类的变量映射为相同名字的表列，当然我们可以修改其映射方式-->
<property name="name"/>
<property name="address"/>
<property name="company_id"/>
</class>
</hibernate-mapping>
///////////////////////////////////////////
test代码：
public class TestCompany {
public TestCompany() {
}
private static SessionFactory sessions;
public static void main(String[] args) throws Exception{
//配置环境，分析xml映射文件
Configuration conf= new Configuration()
.addClass(Person.class)
.addClass(Company.class);
//生成并输出sql到文件（当前目录）和数据库
//SchemaExport dbExport=new SchemaExport(conf);
// dbExport.setOutputFile("build\\sql.txt");
// dbExport.create(true, true);
sessions = conf.buildSessionFactory();
//以上都是些固定格式的环境配置
//start......
Session s = sessions.openSession();
Transaction t = s.beginTransaction();
Set myset=new HashSet();
//1.用普通方式建立对象，填充数据
Company c=new Company();
c.setName("东软");
Person p1=new Person();
p1.setName("陈鹏");
p1.setAddress("西安东郊黄陵");
Person p2=new Person();
p2.setName("孙昱鹏");
p2.setAddress("南郊电子城");
//c.addEmployee(p1);
// c.addEmployee(p2);
myset.clear();
myset.add(p1);
myset.add(p2);
if (myset.contains(p2)&&myset.contains(p1))
{
System.out.println("#################################");
}
//2.持久化
c.setEmployees(myset);
s.saveOrUpdate(c);
s.flush();
//s.save(c);
//此时c,p1,p2已经可以在数据库中找到
t.commit();
s.close();
}
}
//////////////////////////////////////////
/////////////////////////////////////////////
问题：
1，数据库里只插入了p1的值，并没有插入p2的值。
2，person里的company_id值为null.
谢谢！
