Hibernate中对无主键表的操作

<? 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 Persistence Tools 
--> 
< hibernate-mapping > 
         < class  name ="cn.isbn.db.model.TBOperlog"  table ="T_B_OPERLOG"  schema ="LAB1107" > 
                
                        <!--      
                <id name="logid" type="java.lang.String"> 
                        <column name="LOGID" length="20" />                        
                </id> 
                --> 
              < id  name ="operdate"  type ="java.util.Date" > 
                         < column  name ="OPERDATE"  length ="7"  /> 
                 </ id > 
              < property  name ="logid"  type ="java.lang.String" > 
                         < column  name ="LOGID"  length ="20"  />                        
              </ property > 
        
                 < property  name ="opertable"  type ="java.lang.String" > 
                         < column  name ="OPERTABLE"  length ="100"  not-null ="true"  /> 
                 </ property > 
                 < property  name ="operkey"  type ="java.lang.String" > 
                         < column  name ="OPERKEY"  length ="100"  not-null ="true"  /> 
                 </ property > 
                 < property  name ="opertype"  type ="java.lang.String" > 
                         < column  name ="OPERTYPE"  length ="10"  not-null ="true"  /> 
                 </ property > 
                 < property  name ="operperson"  type ="java.lang.String" > 
                         < column  name ="OPERPERSON"  length ="200"  not-null ="true"  /> 
                 </ property > 
                <!--                     
                <property name="operdate" type="java.util.Date"> 
                        <column name="OPERDATE" length="7" /> 
                </property> 
                --> 
                 < property  name ="operdesc"  type ="java.lang.String" > 
                         < column  name ="OPERDESC"  length ="4000"  not-null ="true"  /> 
                 </ property > 
                 < property  name ="recordstauts"  type ="java.lang.String" > 
                         < column  name ="RECORDSTAUTS"  length ="1"  /> 
                 </ property > 
                 < property  name ="field1"  type ="java.lang.String" > 
                         < column  name ="FIELD1"  length ="500"  /> 
                 </ property > 
                 < property  name ="field2"  type ="java.lang.String" > 
                         < column  name ="FIELD2"  length ="500"  /> 
                 </ property > 
         </ class > 
</ hibernate-mapping > 

package cn.isbn.db.model; 

import java.util.Date; 

/** 
* TBOperlog entity. 
*    
* @author MyEclipse Persistence Tools 
*/ 

public  class TBOperlog  implements java.io.Serializable 
{ 

    
   // Fields 

   private String logid; 
   private String opertable; 
   private String operkey; 
   private String opertype; 
   private String operperson; 
   private Date operdate; 
   private String operdesc; 
   private String recordstauts; 
   private String field1; 
   private String field2; 

   // Constructors 


   /** 
    * 无参数的构造函数，只初始化记录编号和时间 
    */ 
   public TBOperlog() 
  { 
     this.recordstauts= "1"; 
     this.operdate =  new Date(); 
  } 

   /** 
    * 必填字段构造函数 
    * @param opertable 操作数据表 
    * @param operkey 操作主键 
    * @param opertype 操作类型 
    * @param operperson 操作人 
    * @param operdesc 操作描述 
    */ 
   public TBOperlog(String opertable, String operkey, String opertype, 
      String operperson, String operdesc) 
  { 
     this.opertable = opertable; 
     this.operkey = operkey; 
     this.opertype = opertype; 
     this.operperson = operperson; 
     this.operdesc = operdesc; 
     this.recordstauts= "1"; 
     this.operdate =  new Date(); 
  } 

   /** full constructor */ 
   public TBOperlog(String opertable, String operkey, String opertype, 
      String operperson, String operdesc, 
      String field1, String field2) 
  { 
     this.opertable = opertable; 
     this.operkey = operkey; 
     this.opertype = opertype; 
     this.operperson = operperson; 
     this.operdate =  new Date(); 
     this.operdesc = operdesc; 
     this.recordstauts =  "1"; 
     this.field1 = field1; 
     this.field2 = field2; 
  } 

   // Property accessors 

   public String getLogid() 
  { 
     return  this.logid; 
  } 

   public  void setLogid(String logid) 
  { 
     this.logid = logid; 
  } 

   public String getOpertable() 
  { 
     return  this.opertable; 
  } 

   public  void setOpertable(String opertable) 
  { 
     this.opertable = opertable; 
  } 

   public String getOperkey() 
  { 
     return  this.operkey; 
  } 

   public  void setOperkey(String operkey) 
  { 
     this.operkey = operkey; 
  } 

   public String getOpertype() 
  { 
     return  this.opertype; 
  } 

   public  void setOpertype(String opertype) 
  { 
     this.opertype = opertype; 
  } 

   public String getOperperson() 
  { 
     return  this.operperson; 
  } 

   public  void setOperperson(String operperson) 
  { 
     this.operperson = operperson; 
  } 

   public Date getOperdate() 
  { 
     return  this.operdate; 
  } 

   public  void setOperdate(Date operdate) 
  { 
     this.operdate = operdate; 
  } 

   public String getOperdesc() 
  { 
     return  this.operdesc; 
  } 

   public  void setOperdesc(String operdesc) 
  { 
     this.operdesc = operdesc; 
  } 

   public String getRecordstauts() 
  { 
     return  this.recordstauts; 
  } 

   public  void setRecordstauts(String recordstauts) 
  { 
     this.recordstauts = recordstauts; 
  } 

   public String getField1() 
  { 
     return  this.field1; 
  } 

   public  void setField1(String field1) 
  { 
     this.field1 = field1; 
  } 

   public String getField2() 
  { 
     return  this.field2; 
  } 

   public  void setField2(String field2) 
  { 
     this.field2 = field2; 
  } 

}

public  boolean addLog(TBOperlog log) 
  { 
     // TODO Auto-generated method stub 
     boolean result =  false; 
    String logid = getLogid();  // 得到记录编号 
     if (!logid.equals("")) 
    { // 如果取得记录编号 
      log.setLogid(logid); 
       this.save(log); 
      result =  true; 
    } 
     return result; 
  }

来自：http: //www.host01.com/article/jsp/00040007/20060805215458644.htm 

Db2 表:Test 只有一个测试字段:name character(10) 

Hibernate的hbm文件:Test.hbm.xml 

<?xml version= "1.0"?> 
<!DOCTYPE hibernate-mapping SYSTEM  "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd"    

> 
<hibernate-mapping> 
<class name="Test" table="test"> 
<composite-id name="testpk" class="Testpk" unsaved-value="any">    
    <key-property name="name" column="name" type="string"/>    
        </composite-id>    
</class> 
</hibernate-mapping> 

    

Test.java 

    

import java.io.Serializable; 

public class Test implements Serializable{ 

private Testpk testpk; 
    
public void setTestpk(Testpk value){ 
    this.testpk=value; 
} 
    
public Testpk getTestpk(){ 
    return this.testpk; 
} 
    
} 


Testpk.java 

import java.io.Serializable;    

public class Testpk implements Serializable{ 
    
private String name; 
public String getName() 
{ 
    return this.name; 
} 
    
public void setName(String value){ 
    this.name=value; 
} 
    
public boolean equals(Object other) {    
            Testpk that = (Testpk) other;    
            
            return this.name.equals(that.name);    
            }    
         
            /**    
        * Returns the hash code for the key.    
        */ 
     
            public int hashCode() {    
            
            return (this.name.hashCode()); 
             
            }    

} 


测试代码： 

Test t=new Test(); 
    Testpk tpk=new Testpk(); 
    tpk.setName("test000000"); 
    t.setTestpk(tpk); 
    session.save(t); 

最后值得注意的是当要load的时候，不能简单的Test t=(Test)session.load(Test.class,"test000000"); 而 

使用一个Testpk作为一个实体类的标识符。 

所以应该这么写: 

Testpk tpk=new Testpk(); 
tpk.setName("test000000"); 
Test t=(Test)session.load(Test.class,tpk); 

    

环境DB2、Eclipise、Hibernate2测试成功