请问hibernate如何映射双主键？在线等

Question

<hibernate-mapping>
<class name="safeIp" table="safeIP">
<composite-id name="safeIpId" class="safeIp">
            <key-property name="IpGroup" type="integer">
                <column name="IPgroup" />
            </key-property>
            <key-property name="Ip" type="integer">
                <column name="IP" />
            </key-property>
</composite-id>
.......................
.......................
 </class>
</hibernate-mapping>
这样就行，不过如果能改数据库的话，我还是建议LZ加一个Id字段最好。复合主键不好使的说。

Answer 1

看看我给你的代码，只要拷贝过去就可以用了
package model;/**
 * AbstractSafeip
 */public abstract class AbstractSafeip  implements java.io.Serializable {
    // Fields         private SafeipId id;
    // Constructors    /** default constructor */
    public AbstractSafeip() {
    }    
    /** full constructor */
    public AbstractSafeip(SafeipId id) {
        this.id = id;
    }   
    // Property accessors    public SafeipId getId() {
        return this.id;
    }
    
    public void setId(SafeipId id) {
        this.id = id;
    }
}package model;
// Generated by MyEclipse - Hibernate Tools/**
 * Safeip
 */
public class Safeip extends AbstractSafeip implements java.io.Serializable {    // Constructors    /** default constructor */
    public Safeip() {
    }    
    /** full constructor */
    public Safeip(SafeipId id) {
        super(id);        
    }
   
}package model;/**
 * SafeipId 
 */public class SafeipId  implements java.io.Serializable {
    // Fields         private long ipgroup;
     private long ip;
    // Constructors    /** default constructor */
    public SafeipId() {
    }       
    // Property accessors    public long getIpgroup() {
        return this.ipgroup;
    }
    
    public void setIpgroup(long ipgroup) {
        this.ipgroup = ipgroup;
    }    public long getIp() {
        return this.ip;
    }
    
    public void setIp(long ip) {
        this.ip = ip;
    }
      public boolean equals(Object other) {
         if ( (this == other ) ) return true;
 if ( (other == null ) ) return false;
 if ( !(other instanceof SafeipId) ) return false;
 SafeipId castOther = ( SafeipId ) other; 
         
 return (this.getIpgroup()==castOther.getIpgroup())
 && (this.getIp()==castOther.getIp());
   }
   
   public int hashCode() {
         int result = 17;
         
         result = 37 * result + (int) this.getIpgroup();
         result = 37 * result + (int) this.getIp();
         return result;
   }   
}file name : Safeip.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="model.Safeip" table="SAFEIP" schema="YPMS">
        <composite-id name="id" class="model.SafeipId">
            <key-property name="ipgroup" type="long">
                <column name="IPGROUP" precision="10" scale="0" />
            </key-property>
            <key-property name="ip" type="long">
                <column name="IP" precision="10" scale="0" />
            </key-property>
        </composite-id>
    </class>
</hibernate-mapping>