请问这样的关系如何设计，谁给支一招？

比如说一张桌子上有四个人打麻将。

public class Table{
   private Person east;
   private Person west;
   private Person south;
   private Person north;
   private String tableid;
}

public class Person{
   private Table table;
   private String personid;
}


在这里Person与Table是做面one-to-one 还是many-to-one呢，映射文件该怎么写呢。先谢了！

其实楼主的class 属性就暗示了这种关系。

看你的系统的控制范围是什么？如果是只在这个桌子，那么就是Person0...1--------4...0Table。
   如果是多张桌子，那么就是Person0...*---------4...0Table。

怪我没表达清楚，我是问这种关系该如何用HIBERNATE进行映射，在定义Person.hbm.xml文件时，table属性是定义成多对一还是一对一，映射文件该怎么写。

jasonhsu，你是把一张桌子的每一边做为了Table的一个属性，所有没有什么桌子同人的关系，而是桌子的每一边同人的关系。
一张桌子的每一边（east、west、south、north）只能坐一个人；一个人只能坐在一张桌子的一边——就是这个关系。

楼上的，关系映射怎么写呀

larlf,你分析得很对，可是我就是问对这种关系进行映射时该怎么写啊

你的代码显然是一对一啊。共享primary key的one-to-one方式明显不合适这个例子，那就用many-to-one.

我的设计是Table对象的每个方向属性对Person对象是many-to-one关系，而每个Person对象对Table对象也是many-to-one关系。相关代码如下：

Table类Java代码：

public class Table {
	
	private Long id;
	
	private String name;
	
	private Person east;
	
	private Person west;
	
	private Person north;
	
	private Person south;	

	/**
	 * @return Returns the east.
	 */
	public Person getEast() {
		return east;
	}
	/**
	 * @param east The east to set.
	 */
	public void setEast(Person east) {
		this.east = east;
		east.setTable(this);
		east.setPosition("east");
	}
	/**
	 * @return Returns the id.
	 */
	public Long getId() {
		return id;
	}
	/**
	 * @param id The id to set.
	 */
	public void setId(Long id) {
		this.id = id;
	}
	/**
	 * @return Returns the name.
	 */
	public String getName() {
		return name;
	}
	/**
	 * @param name The name to set.
	 */
	public void setName(String name) {
		this.name = name;
	}
	/**
	 * @return Returns the north.
	 */
	public Person getNorth() {
		return north;
	}
	/**
	 * @param north The north to set.
	 */
	public void setNorth(Person north) {
		this.north = north;
		north.setTable(this);
		north.setPosition("north");
	}
	/**
	 * @return Returns the south.
	 */
	public Person getSouth() {
		return south;
	}
	/**
	 * @param south The south to set.
	 */
	public void setSouth(Person south) {
		this.south = south;
		south.setTable(this);
		south.setPosition("south");
	}
	/**
	 * @return Returns the west.
	 */
	public Person getWest() {
		return west;
	}
	/**
	 * @param west The west to set.
	 */
	public void setWest(Person west) {
		this.west = west;
		west.setTable(this);
		west.setPosition("west");
	}
}

映射文件：

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC 	"-//Hibernate/Hibernate Mapping DTD 2.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">

<hibernate-mapping>
    <class name="Table" table="T_TABLE">
		<id name="id" unsaved-value="null">
			<generator class="native"/>
		</id>
		<property name="name"/>		
		<many-to-one name="south" class="Person" column="south_id" unique="true" cascade="all"/>
		<many-to-one name="west" class="Person" column="west_id" unique="true" cascade="all"/>
		<many-to-one name="east" class="Person" column="east_id" unique="true" cascade="all"/>
		<many-to-one name="north" class="Person" column="north_id" unique="true" cascade="all"/>
    </class>    
</hibernate-mapping>

Person类代码：

public class Person {
	
	private Long id;
	
	private String name;
	
	private Table table;
	
	private String position;	
		
	/**
	 * @return Returns the name.
	 */
	public String getName() {
		return name;
	}
	/**
	 * @param name The name to set.
	 */
	public void setName(String name) {
		this.name = name;
	}

	/**
	 * @return Returns the position.
	 */
	public String getPosition() {
		return position;
	}
	/**
	 * @param position The position to set.
	 */
	public void setPosition(String position) {
		this.position = position;
	}
	/**
	 * @return Returns the id.
	 */
	public Long getId() {
		return id;
	}
	/**
	 * @param id The id to set.
	 */
	public void setId(Long id) {
		this.id = id;
	}
	/**
	 * @return Returns the table.
	 */
	public Table getTable() {
		return table;
	}
	/**
	 * @param table The table to set.
	 */
	public void setTable(Table table) {
		this.table = table;
	}
}

映射文件：

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC 	"-//Hibernate/Hibernate Mapping DTD 2.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">

<hibernate-mapping>
    <class name="Person" table="T_PERSON">
		<id name="id" unsaved-value="null">
			<generator class="native"/>
		</id>
		<property name="name"/>
		<property name="position"/>
		<many-to-one name="table" class="Table" column="table_id" />
    </class>    
</hibernate-mapping>

给某张桌子的某个位置安排打牌的人：

Person robbin = new Person();
p.setName("robbin");
session.save(robbin);

Person jasonhsu = new Person();
p.setName("jasonhsu");
session.save(jasonhsu);

Table table = (Table) session.load(Table.class, id);
table.setEast(robbin);
table.setWest(jasonhsu);
session.update(table);

忙着搬家，没有办法仔细推敲测试了，仅供参考。