ID的Hibernate未知整数数据类型
我从Hibernate开始,但有一个我无法弄清的错误。
我有以下课程:
@Entity@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
public abstract class AbstractColumn {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private String id;
private String name;
//Other stuff
}
那我有
@Entitypublic class DoubleColumn extends AbstractColumn implements Column {
@ElementCollection
private Map<Double,String> isNA;
private double min=0;
private double max=0;
@ElementCollection
private List<Double> data;
// a lot of stuff
}
最后:
@Entitypublic class DataFrame {
@OneToMany(cascade = CascadeType.ALL)
@PrimaryKeyJoinColumn
private List<AbstractColumn> data;
private String name;
@Id
@GeneratedValue
private String id;
@ElementCollection
private Map<String,Integer> colIndex;
//more stuff
}
我得到的错误是:
Exception in thread "main" org.hibernate.id.IdentifierGenerationException: Unknown integral data type for ids : java.lang.String at org.hibernate.id.IdentifierGeneratorHelper.getIntegralDataTypeHolder(IdentifierGeneratorHelper.java:224)
at org.hibernate.id.enhanced.SequenceStructure$1.getNextValue(SequenceStructure.java:98)
at org.hibernate.id.enhanced.NoopOptimizer.generate(NoopOptimizer.java:40)
at org.hibernate.id.enhanced.SequenceStyleGenerator.generate(SequenceStyleGenerator.java:432)
at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:105)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:192)
at org.hibernate.event.internal.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:38)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:177)
at org.hibernate.event.internal.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:32)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:73)
at org.hibernate.internal.SessionImpl.fireSave(SessionImpl.java:675)
at org.hibernate.internal.SessionImpl.save(SessionImpl.java:667)
at org.hibernate.internal.SessionImpl.save(SessionImpl.java:662)
at Main.main(Main.java:285)
错误引发的唯一提示是该错误在此处的主类中:
DoubleColumn c1 = new DoubleColumn("Datos varios"); c1.addData(12);
c1.addData(11);
c1.addData(131);
c1.addData(121);
c1.addData(151);
c1.addData(116);
DataFrame datosHibernate = new DataFrame("Dataframe Hibernate");
datosHibernate.addColumn(c1);
Configuration hibernateConfig = new Configuration();
SessionFactory sessionFactory = hibernateConfig.configure().buildSessionFactory();
Session session = sessionFactory.openSession();
session.beginTransaction();
session.save(datosHibernate);
session.getTransaction().commit();
session.disconnect();
session.close();
System.exit(0);
这些id是字符串,我将它们标注为@GeneratedValue(我认为我不需要自己初始化它们)。关系@OneToMany具有级联注释,因此应正确映射。
我已经尝试了没有session.save行的代码,并且不会抛出错误,因此代码本身不是问题,它必须与Hibernate兼容。
我的配置文件是:
<hibernate-configuration> <session-factory>
<property name="connection.url">jdbc:h2:E:/bd;DB_CLOSE_DELAY=-1;MVCC=TRUE</property>
<property name="connection.driver_class">org.h2.Driver</property>
<property name="connection.username">user</property>
<property name="connection.password"></property>
<property name="dialect">org.hibernate.dialect.H2Dialect</property>
<property name="show_sql">true</property>
<property name="hbm2ddl.auto">create</property>
<mapping class="com.dataframe.estructuras.DataFrame"></mapping>
<mapping class="com.dataframe.estructuras.column.AbstractColumn"/>
<mapping class="com.dataframe.estructuras.column.types.DoubleColumn"/>
</session-factory>
</hibernate-configuration>
它创建了数据库文件,我看到了生成的所有SQL代码,表以及全部。是当事情中断时它尝试存储信息的时间。
回答:
如果要将String用作数据库密钥,则需要使用UUID自动生成密钥。像这样:
@Id @GeneratedValue(generator="system-uuid")@GenericGenerator(name="system-uuid", strategy = "uuid")
private String myId;
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