本人java 新手 现学习hibernate中，感觉非常迷糊，做项目遇到问题，一下午查资料都没解决掉。 上来求帮助 贴代码
Users 类
[code="java"]
public class Users implements Serializable {
/**
*
*/
private static final long serialVersionUID = -6394776786611105432L;
private int id;
private String username;
private String userpwd;
private String usertype;
private Set score = new HashSet();
private String userid;
// public void Users(){
// }
public String getUserid() {
return userid;
}
public void setUserid(String suseriderid) {
this.userid = suseriderid;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getUserpwd() {
return userpwd;
}
public void setUserpwd(String userpwd) {
this.userpwd = userpwd;
}
public String getUsertype() {
return usertype;
}
public void setUsertype(String usertype) {
this.usertype = usertype;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public Set<Score> getScore() {
return score;
}
public void setScore(Set<Score> score) {
this.score = score;
}
}
[/code]
score类[code="java"]
public class Score implements Serializable {
private String username;
private String score;
private int id;
private String userid;
private String examtime;
private String examname;
private Users user;
public Users getUser() {
return user;
}
public void setUser(Users user) {
this.user = user;
}
//private Users user;
// public void setUser(Users user) {
// this.user = user;
// }
// public void Score(){
//
// }
public String getUserid() {
return userid;
}
public void setUserid(String userid) {
this.userid = userid;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getScore() {
return score;
}
public void setScore(String score) {
this.score = score;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getExamtime() {
return examtime;
}
public void setExamtime(String examtime) {
this.examtime = examtime;
}
public String getExamname() {
return examname;
}
public void setExamname(String examname) {
this.examname = examname;
}
}
[/code]
users 映射文件
[code="java"]
<?xml version="1.0" encoding='utf-8'?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<class name="bean.usertrain.Users" table="users">
<id name="id" type="java.lang.Integer">
<column name="id"/>
<generator class="sequence">
<param name="sequence">sequence_name</param>
</generator>
</id>
<property name="username" type="java.lang.String">
<column name="username"/>
</property>
<property name="userpwd" type="java.lang.String">
<column name="userpwd"/>
</property>
<property name="usertype" type="java.lang.String">
<column name="usertype"/>
</property>
<set name="score" lazy="false" inverse="false" cascade="all" table="score" >
<key column="userid"/>
<one-to-many class="bean.usertrain.Score"/>
</set>
</class>
[/code]
score类映射文件
[code="java"]
<?xml version="1.0" encoding='utf-8'?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<class name="bean.usertrain.Score" table="score">
<id name="id" type="java.lang.Integer">
<column name="id" />
<generator class="native" />
</id>
<property name="username" type="java.lang.String">
<column name="username" />
</property>
<property name="score" type="java.lang.String">
<column name="score" />
</property>
<property name="examtime" type="java.lang.String">
<column name="examtime" />
</property>
<property name="examname" type="java.lang.String">
<column name="examname" />
</property>
<many-to-one name="user" class="bean.usertrain.Users" cascade="none" >
<column name="userid" />
</many-to-one>
</class>
[/code]
方法
[code="java"] public boolean save(Score score,String userid) {
Session session= HibernateSessionFactory.getSession();
Transaction tx = session.beginTransaction();
// Users user=(Users)session.load(Users.class, new Integer("29"));
Users user = new Users();
user.setUserid(userid);
score.setUser(user);
session.save(score);
tx.commit();
session.close();
return true;
}[/code]
主要想 给 score 表中跟user类中添加一条记录，user 表的userid 跟 score 表的userid 要匹配上 我已运行 就报错
错误代码
[code="java"]
严重: Servlet.service() for servlet default threw exception
java.sql.SQLException: ORA-02289: 序列（号）不存在
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:111)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:330)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:287)
at oracle.jdbc.driver.T4C8Oall.receive(T4C8Oall.java:742)
at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:215)
at oracle.jdbc.driver.T4CPreparedStatement.executeForDescribe(T4CPreparedStatement.java:798)
at oracle.jdbc.driver.OracleStatement.executeMaybeDescribe(OracleStatement.java:1038)
at oracle.jdbc.driver.T4CPreparedStatement.executeMaybeDescribe(T4CPreparedStatement.java:838)
at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1131)
at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3284)
at oracle.jdbc.driver.OraclePreparedStatement.executeQuery(OraclePreparedStatement.java:3328)
at org.hibernate.id.SequenceGenerator.generate(SequenceGenerator.java:75)
at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:99)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:187)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:172)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:94)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)
at org.hibernate.impl.SessionImpl.fireSaveOrUpdate(SessionImpl.java:507)
at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:499)
at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:495)
at dao.exam.ScoreDAOImpl.save(ScoreDAOImpl.java:215)
at action.usertrain.ScoreServlet.addScore(ScoreServlet.java:63)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
[/code]
求教 解答
[b]问题补充：[/b]
回汪兆铭 那几个文章我也看了 还是没解决
回lovewhzlq
[code="java"]Users user=(Users)session.load(Users.class, new Integer("29"));
Users user = new Users(); [/code]
这。。 不行吧。 我注掉了 第一句 问题还是那样
[b]问题补充：[/b]
我oracle数据库 我就是看了 之前看了1L给的文章 把NATIVE改成sequence ，因为每次都自动执行一个
[code="java"]select
hibernate_sequence.nextval
from
dual[/code]
语句， 我按照别人写的建了一个[code="java"]create sequence hibernate_sequence start with 1 increment by 1;[/code]
不再报序列号不存在了 但是还有问题。。 这个问题就到这里了 谢谢各位了
