求hibernate达人帮忙解决一下复合主键中一个字段自增有关问题

求hibernate达人帮忙解决一下复合主键中一个字段自增问题

Java code

@Entity@IdClass(GirlPK.class)public class Girl{    private int id;    private String name;    private int age;        @Id    @GeneratedValue(strategy=GenerationType.IDENTITY)    public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    @Id    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public int getAge() {        return age;    }    public void setAge(int age) {        this.age = age;    }    }

Java code

public class GirlPK implements Serializable {    private static final long serialVersionUID = 1L;    private int id;    private String name;        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;    }    public boolean equal(Object obj){        if(this == obj){            return true;        }        if(obj != null && obj.getClass() == GirlPK.class){            GirlPK target = (GirlPK)obj;            if(target.getId() == getId() && target.getName().equals(getName())){                return true;            }        }        return false;    }    public int hashCode(){        return getId()*7+getName().hashCode();    }        

Java code

public class Test {    private static SessionFactory sessionFactory;    private static ServiceRegistry serviceRegistry;    public static void main(String[] args) {        GirlPK gpk = new GirlPK();        Girl g = new Girl();        g.setAge(23);        Configuration config = new Configuration().configure(); // 读取hibernate配置文件        serviceRegistry = new ServiceRegistryBuilder().applySettings(                config.getProperties()).buildServiceRegistry();        sessionFactory = config.buildSessionFactory(serviceRegistry); // 创建SessionFactory        Session session = sessionFactory.openSession();        session.beginTransaction();        session.save(g);        session.flush();        session.getTransaction().commit();    }}

如代码所示
GirlPK为复合主键
Girl为实体类
用hibernate自动生成表显示的SQL为

SQL code

 drop table Girl    create table Girl (        id int identity not null,        name varchar(255) not null,        age int not null,        primary key (id, name)    )

但是之后执行test的时候报错为

ERROR: HHH000123: IllegalArgumentException in class: test.GirlPK, setter method of property: id
二月 10, 2012 9:21:32 下午 org.hibernate.property.BasicPropertyAccessor$BasicSetter set
ERROR: HHH000091: Expected type: int, actual value: org.hibernate.id.IdentifierGeneratorHelper$2
Exception in thread "main" org.hibernate.PropertyAccessException: IllegalArgumentException occurred while calling setter of test.GirlPK.id
at org.hibernate.property.BasicPropertyAccessor$BasicSetter.set(BasicPropertyAccessor.java:119)
at org.hibernate.mapping.Component$ValueGenerationPlan.execute(Component.java:436)
at org.hibernate.id.CompositeNestedGeneratedValueGenerator.generate(CompositeNestedGeneratedValueGenerator.java:121)
at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:120)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:204)

at org.hibernate.event.internal.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:55)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:189)
at org.hibernate.event.internal.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:49)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:90)
at org.hibernate.internal.SessionImpl.fireSave(SessionImpl.java:642)
at org.hibernate.internal.SessionImpl.save(SessionImpl.java:635)
at org.hibernate.internal.SessionImpl.save(SessionImpl.java:631)
at test.Test.main(Test.java:25)
Caused by: java.lang.IllegalArgumentException: argument type mismatch
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.hibernate.property.BasicPropertyAccessor$BasicSetter.set(BasicPropertyAccessor.java:65)
... 12 more
大概意思好像就是和GirlPK的id的类型不匹配
小弟实在是没明白是怎么个不匹配
其实目的就是想在那个复合主键里面让id为自动生成，name为自己填写
求大大们帮忙看看怎样解决呗

[解决办法]
好像不能这样做吧 。。 你在哪里看 的饿 。。 我以前做 都是 先把这2个属性封装成一个对象，让id为主键。然后把这个对象当作一个主键来使用！！

查看更多 下一篇