hibernate问题，在线等

Question

<?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">
<!-- 
    Mapping file autogenerated by MyEclipse - Hibernate Tools
-->
<hibernate-mapping>
    <class name="pojo.Player" table="player" schema="dbo" catalog="NBA">
        <id name="pid" type="java.lang.Integer">
            <column name="pid" />
            <generator class="native" />
        </id>
        <property name="pname" type="java.lang.String">
            <column name="pname" length="20" not-null="true" />
        </property>
        <many-to-one name="team" class="pojo.Team" column="tid"></many-to-one>
    </class>
</hibernate-mapping>package pojo;/**
 * Player generated by MyEclipse - Hibernate Tools
 */public class Player  implements java.io.Serializable {
    // Fields         private Integer pid;
     private String pname;
     private Team team;
    // Constructors    /** default constructor */
    public Player() {
    }    
    /** full constructor */
    public Player(String pname, Team team) {
        this.pname = pname;
        this.team = team;
    }   
    // Property accessors    public Integer getPid() {
        return this.pid;
    }
    
    public void setPid(Integer pid) {
        this.pid = pid;
    }    public String getPname() {
        return this.pname;
    }
    
    public void setPname(String pname) {
        this.pname = pname;
    }
public Team getTeam() {
return team;
}
public void setTeam(Team team) {
this.team = team;
}
}<?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">
<!-- 
    Mapping file autogenerated by MyEclipse - Hibernate Tools
-->
<hibernate-mapping>
    <class name="pojo.Team" table="team" schema="dbo" catalog="NBA">
        <id name="id" type="java.lang.Integer">
            <column name="id" />
            <generator class="native" />
        </id>
        <property name="tid" type="java.lang.Integer">
            <column name="tid" not-null="true" />
        </property>
        <property name="tname" type="java.lang.String">
            <column name="tname" length="30" not-null="true" />
        </property>
        <set name="players" table="player" cascade="all" inverse="true">
        <key column="tid"></key>
        <one-to-many class="pojo.Player"/>
        </set>
    </class>
</hibernate-mapping>package pojo;import java.util.HashSet;
import java.util.Set;/**
 * Team generated by MyEclipse - Hibernate Tools
 */public class Team  implements java.io.Serializable {
    // Fields         private Integer id;
     private Integer tid;
     private String tname;
     private Set players = new HashSet();
    // Constructors    /** default constructor */
    public Team() {
    }    
    /** full constructor */
    public Team(Integer tid, String tname) {
        this.tid = tid;
        this.tname = tname;
    }   
    // Property accessors    public Integer getId() {
        return this.id;
    }
    
    public void setId(Integer id) {
        this.id = id;
    }    public Integer getTid() {
        return this.tid;
    }
    
    public void setTid(Integer tid) {
        this.tid = tid;
    }    public String getTname() {
        return this.tname;
    }
    
    public void setTname(String tname) {
        this.tname = tname;
    }
public Set getPlayers() {
return players;
}
public void setPlayers(Set players) {
this.players = players;
}
}

Answer 1

package dao;import pojo.Player;
import pojo.Team;public class ClassMain { /**
 * @param args
 */
public static void main(String[] args) {
// TODO Auto-generated method stub
Player p = new Player();
Team t = new Team();
t.setTname("Phoenix Suns");
p.setPname("Marcus Banks");
//p.setPname("Tracy McGrady");
p.setTeam(t);
PlayerOperate po = new PlayerOperate();
po.addPlayer(p);
//TeamOperate to = new TeamOperate();
//to.addTeam(t);
}}
执行后，报异常：
Hibernate: insert into NBA.dbo.player (pname, tid) values (?, ?) select scope_identity()
Exception in thread "main" org.hibernate.exception.GenericJDBCException: could not insert: [pojo.Player]

Answer 2

按你的配置，应该先把Team对象持久了，再持久Player对象，因为你用了
<set name="players" table="player" cascade="all" inverse="true">
        <key column="tid"></key>
        <one-to-many class="pojo.Player"/>
        </set>
当然，你也可以加上inverse="true"

Answer 3

参考我的博客
http://blog.csdn.net/kipen/archive/2007/04/05/1553448.aspx

Answer 4

inverse="true"到底是什么意思，我还没彻底搞明白

Answer 5

Kipen(石の頭丶) ，看了你的博客，想问你个问题你是不是就是美河里的那个老师啊？

Answer 6

inverse="true"到底是什么意思，我还没彻底搞明白
==========================
请问你知道什么叫google,什么叫百度吗？

Answer 7

我搜过的知道inverse="true"是把控制权交出去给默认是false的一方，可总觉得没有彻底搞明白，所以问的．