请问有关hibernate3的数据库更新问题
使用eclipse自带的hibernate插件，自动生成java、xml等配置文件
结果在使用dao进行数据库更新的时候发现数据库数据并未更新。以下为相关java文件，请大大们帮忙看看问题出在哪里。
/**
* TestVisitor.java
*/
public class TestVisitor {
public static void main(String[] args){
VisitorDAO dao=new VisitorDAO();
List listtop=dao.findByTop(1);
for(int i=0;i <listtop.size();i++){
Visitor ob=(Visitor)listtop.get(i);
System.out.println(ob.getIp());
ob.setIp( "211.147.72.163 ");
dao.save(ob);
System.out.println(ob.getIp());
}
System.out.println( "------------------- ");
}
}
/**
* AbstractVisitor generated by MyEclipse - Hibernate Tools
*/
public abstract class AbstractVisitor implements java.io.Serializable {
// Fields
private Long id;
private String ip;
// Constructors
/** default constructor */
public AbstractVisitor() {
}
/** minimal constructor */
public AbstractVisitor(Long id) {
this.id = id;
}
/** full constructor */
public AbstractVisitor(Long id,String ip) {
this.id = id;
this.ip = ip;
}
// Property accessors
public Long getId() {
return this.id;
}
public void setId(Long id) {
this.id = id;
}
public String getIp() {
return this.ip;
}
public void setIp(String ip) {
this.ip = ip;
}
}
/**
* Visitor generated by MyEclipse - Hibernate Tools
*/
public class Visitor extends AbstractVisitor implements java.io.Serializable {
// Constructors
/** default constructor */
public Visitor() {
}
/** minimal constructor */
public Visitor(Long id) {
super(id);
}
/** full constructor */
public Visitor(Long id,String ip) {
super(id,ip);
}
}
/**
* Data access object (DAO) for domain model class Visitor.
* @see Visitor
* @author MyEclipse - Hibernate Tools
*/
public class VisitorDAO extends BaseHibernateDAO {
private static final Log log = LogFactory.getLog(VisitorDAO.class);
//property constants
public static final String IP = "ip ";
public void save(Visitor transientInstance) {
log.debug( "saving Visitor instance ");
try {
getSession().save(transientInstance);
log.debug( "save successful ");
} catch (RuntimeException re) {
log.error( "save failed ", re);
throw re;
}
}
public void delete(Visitor persistentInstance) {
log.debug( "deleting Visitor instance ");
try {
getSession().delete(persistentInstance);
log.debug( "delete successful ");
} catch (RuntimeException re) {
log.error( "delete failed ", re);
throw re;
}
}
public Visitor findById( java.lang.Long id) {
log.debug( "getting Visitor instance with id: " + id);
try {
Visitor instance = (Visitor) getSession()
.get( "Visitor ", id);
return instance;
} catch (RuntimeException re) {
log.error( "get failed ", re);
throw re;
}
}
public List findByExample(Visitor instance) {
log.debug( "finding Visitor instance by example ");
try {
List results = getSession()
.createCriteria( "Visitor ")
.add(Example.create(instance))
.list();
log.debug( "find by example successful, result size: " + results.size());
return results;
} catch (RuntimeException re) {
log.error( "find by example failed ", re);
throw re;
}
}
public List findByProperty(String propertyName, Object value) {
log.debug( "finding Visitor instance with property: " + propertyName
+ ", value: " + value);
try {
String queryString = "from Visitor as model where model. "
+ propertyName + "= ? ";
Query queryObject = getSession().createQuery(queryString);
queryObject.setParameter(0, value);
return queryObject.list();
} catch (RuntimeException re) {
log.error( "find by property name failed ", re);
throw re;
}
}
public List findByOrder() {
log.debug( "finding Visitor instance with order. ");
try {
String queryString = "from Visitor order by id desc ";
Query queryObject = getSession().createQuery(queryString);
return queryObject.list();
} catch (RuntimeException re) {
log.error( "find by order failed ", re);
throw re;
}
}
public List findByTop(java.lang.Integer n) {
log.debug( "finding Visitor instance with top "+n+ " record order by id desc. ");
try {
String queryString = "from Visitor order by id desc ";
Query queryObject = getSession().createQuery(queryString);
queryObject.setFirstResult(0);
queryObject.setMaxResults(n);
return queryObject.list();
} catch (RuntimeException re) {
log.error( "find by top "+ n + " failed ", re);
throw re;
}
}
public List findByIp(Object ip) {
return findByProperty(IP, ip);
}
public Visitor merge(Visitor detachedInstance) {
log.debug( "merging Visitor instance ");
try {
Visitor result = (Visitor) getSession()
.merge(detachedInstance);
log.debug( "merge successful ");
return result;
} catch (RuntimeException re) {
log.error( "merge failed ", re);
throw re;
}
}
public void attachDirty(Visitor instance) {
log.debug( "attaching dirty Visitor instance ");
try {
getSession().saveOrUpdate(instance);
log.debug( "attach successful ");
} catch (RuntimeException re) {
log.error( "attach failed ", re);
throw re;
}
}
public void attachClean(Visitor instance) {
log.debug( "attaching clean Visitor instance ");
try {
getSession().lock(instance, LockMode.NONE);
log.debug( "attach successful ");
} catch (RuntimeException re) {
log.error( "attach failed ", re);
throw re;
}
}
}
//Visitor.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 ">
<!--
Mapping file autogenerated by MyEclipse - Hibernate Tools
-->
<hibernate-mapping>
<class name= "Visitor " table= "Visitor " schema= "dbo " catalog= "Status ">
<id name= "id " type= "java.lang.Long ">
<column name= "Id " precision= "10 " scale= "0 " />
<generator class= "assigned " />
</id>
<property name= "ip " type= "java.lang.String ">
<column name= "Ip " length= "15 " />
</property>
</class>
</hibernate-mapping>
[解决办法]
你的数据库事务处理的代码呢
public void save(Visitor transientInstance) {
log.debug( "saving Visitor instance ");
try {
getSession().save(transientInstance);
log.debug( "save successful ");
} catch (RuntimeException re) {
log.error( "save failed ", re);
throw re;
}
}
这个方法里面没有看到
你是怎么处理事务的