zisheng phenix

Joachim Rohde wrote:A well-intentioned advice: read the article under http://catb.org/esr/faqs/smart-questions.html before you ask a question the next time.

thank you for your advice!I am studying hibernate ,you know,I am a beginner .could you give me some advice and
recommend some books,thank you very much

This problem has been resolved.
change the hibernate.xml SQL dialect
<property name="dialect">org.hibernate.dialect.OracleDialect</property>
ok!

help does not come？

person Class

package hibernate3.pojo;

public class Person {
private Integer id;
private String name;

public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}

envirment:
hibernate 3.2;
datbase oracle;
hibernateXML:
<?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> <!-- Database connection settings --> <property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property> <property name="connection.url">jdbc:oracle:thin:@218.198.118.78:1521:phenix</property> <property name="connection.username">U_Test</property> <property name="connection.password">U_Test</property> <!-- JDBC connection pool (use the built-in) --> <property name="connection.pool_size">1</property> <!-- SQL dialect --> <property name="dialect">org.hibernate.dialect.HSQLDialect</property> <!-- Enable Hibernate's automatic session context management --> <property name="current_session_context_class">thread</property> <!-- Disable the second-level cache --> <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property> <!-- Echo all executed SQL to stdout --> <property name="show_sql">true</property> <!-- Drop and re-create the database schema on startup --> <property name="hbm2ddl.auto">create</property> <mapping resource="hibernate3/pojo/person.hbm.xml"/> </session-factory> </hibernate-configuration>
person.hbm.xml:
<?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="hibernate3.pojo.Person" table="T_person"> <id name="id" column="id" type="java.lang.Long"> <generator class="native"> <param name="sequence">S_Person_ID</param> </generator> </id> <property name="name" column="name" type="java.lang.String"/> </class> </hibernate-mapping>
table:
DROP SEQUENCE S_Person_ID; CREATE SEQUENCE S_Person_ID INCREMENT BY 1 START WITH 1 MAXVALUE 1.0E28 MINVALUE 1 NOCYCLE CACHE 20 ORDER; DROP TABLE T_Person; CREATE TABLE T_Person ( id NUMBER (18,0) NOT NULL PRIMARY KEY, --人员的ID号 Name NVARCHAR2(50) NOT NULL --人员的名称 ); SQL> desc T_person 名称 是否为空? 类型 ----------------------------------------- -------- ---------------------------- ID NOT NULL NUMBER(18) NAME NOT NULL NVARCHAR2(50)
my Test Code:

package cn.thinkmore.hibernate.session; import org.hibernate.Session; import org.hibernate.SessionFactory; import org.hibernate.cfg.Configuration; public class Hibernate3Util { private static SessionFactory sessionFactory; static{ sessionFactory=new Configuration().configure("/hibernateCFG.xml").buildSessionFactory(); } private static final ThreadLocal<Session> sessionContainer=new ThreadLocal<Session>(); public static Session currentSession(){ Session session=(Session)sessionContainer.get(); if(null==session){ session=sessionFactory.openSession(); sessionContainer.set(session); } return session; } public static void closeSession(){ Session session=sessionContainer.get(); if (null==session) { }else { session=sessionContainer.get(); session.close(); } } } import hibernate3.pojo.Person; import org.hibernate.Session; import org.hibernate.Transaction; import cn.thinkmore.hibernate.session.Hibernate3Util; public class TestSession { /** * @param args */ public static void main(String[] args) { Session session=Hibernate3Util.currentSession(); Person person=new Person(); person.setId(1); person.setName("phenix"); Transaction ts=session.beginTransaction(); session.save(person); ts.commit(); } }
error:



Hibernate: insert into T_person (id, name) values (null, ?)
Exception in thread "main" org.hibernate.exception.ConstraintViolationException: could not insert: [hibernate3.pojo.Person]
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:71)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
at org.hibernate.id.insert.AbstractSelectingDelegate.performInsert(AbstractSelectingDelegate.java:40)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2158)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2638)
at org.hibernate.action.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:48)
at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:250)
at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:298)
at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:181)
at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:107)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:187)
at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:33)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:172)
at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:27)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)
at org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:535)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:523)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:519)
at test.TestSession.main(TestSession.java:21)
Caused by: java.sql.SQLException: ORA-01400: 无法将 NULL 插入 ("U_TEST"."T_PERSON"."ID")

at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:134)
at oracle.jdbc.ttc7.TTIoer.processError(TTIoer.java:289)
at oracle.jdbc.ttc7.Oall7.receive(Oall7.java:573)
at oracle.jdbc.ttc7.TTC7Protocol.doOall7(TTC7Protocol.java:1891)
at oracle.jdbc.ttc7.TTC7Protocol.parseExecuteFetch(TTC7Protocol.java:1093)
at oracle.jdbc.driver.OracleStatement.executeNonQuery(OracleStatement.java:2047)
at oracle.jdbc.driver.OracleStatement.doExecuteOther(OracleStatement.java:1940)
at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:2709)
at oracle.jdbc.driver.OraclePreparedStatement.executeUpdate(OraclePreparedStatement.java:589)
at org.hibernate.id.insert.AbstractSelectingDelegate.performInsert(AbstractSelectingDelegate.java:33)
... 16 more