Having problem with inserting data into table using hibernate

[Varun Nayudu]

Hi guys,

I am having trouble with adding data into the database using hibernate .I have got a table 'ln_user_group' which has 2 columns 'userid,groupname'. Both these fields act as a primary key

The Hibernate mapping file is as follows

 
<hibernate-mapping>   
    <class name="his1.User.LnUserGroup" table="ln_user_group" catalog="his1">   
        <composite-id name="id" class="his1.User.LnUserGroupId">   
            <key-property name="userid" type="string">   
                <column name="USERID" length="20" />   
            </key-property>   
            <key-property name="groupname" type="string">   
                <column name="GROUPNAME" length="20" />   
            </key-property>   
        </composite-id>   
    </class>   
</hibernate-mapping>    
  
<hibernate-mapping>
    <class name="his1.User.LnUserGroup" table="ln_user_group" catalog="his1">
        <composite-id name="id" class="his1.User.LnUserGroupId">
            <key-property name="userid" type="string">
                <column name="USERID" length="20" />
            </key-property>
            <key-property name="groupname" type="string">
                <column name="GROUPNAME" length="20" />
            </key-property>
        </composite-id>
    </class>
</hibernate-mapping>   
   

I am using netbeansIDE and it automatically generates 2 POJO's of the table 'ln_user_group'

The 2 POJO's a given below..

public class LnUserGroup  implements java.io.Serializable {   
  
     private LnUserGroupId id;   
     public LnUserGroup() {   
    }   
  
    public LnUserGroup(LnUserGroupId id) {   
       this.id = id;   
    }   
      
    public LnUserGroupId getId() {   
        return this.id;   
    }   
    public void setId(LnUserGroupId id) {   
        this.id = id;   
    }   
}   

And the other one is

public class LnUserGroupId  implements java.io.Serializable {   
  
     private String userid;   
     private String groupname;   
  
    public LnUserGroupId() {   
    }   
  
    public LnUserGroupId(String userid, String groupname) {   
       this.userid = userid;   
       this.groupname = groupname;   
    }   
      
    public String getUserid() {   
        return this.userid;   
    }   
       
    public void setUserid(String userid) {   
        this.userid = userid;   
    }   
    public String getGroupname() {   
        return this.groupname;   
    }   
       
    public void setGroupname(String groupname) {   
        this.groupname = groupname;   
    }   
  
   public boolean equals(Object other) {   
         if ( (this == other ) ) return true;   
         if ( (other == null ) ) return false;   
         if ( !(other instanceof LnUserGroupId) ) return false;   
         LnUserGroupId castOther = ( LnUserGroupId ) other;    
            
         return ( (this.getUserid()==castOther.getUserid()) || ( this.getUserid()!=null && castOther.getUserid()!=null && this.getUserid().equals(castOther.getUserid()) ) )   
 && ( (this.getGroupname()==castOther.getGroupname()) || ( this.getGroupname()!=null && castOther.getGroupname()!=null && this.getGroupname().equals(castOther.getGroupname()) ) );   
   }   
      
   public int hashCode() {   
         int result = 17;   
         result = 37 * result + ( getUserid() == null ? 0 : this.getUserid().hashCode() );   
         result = 37 * result + ( getGroupname() == null ? 0 : this.getGroupname().hashCode() );   
         return result;   
   }      
}   

Now i understand it creates 2 pojo's for generating a unique id , but i want to know how do i add data into this table 'ln_user_group'

My code for adding data into table is as follows:

LnUserGroup u = new LnUserGroup();                  //Require a Check to see if it works or no!!!!!   
  u.getId().setGroupname(groupName);   
  u.getId().setUserid(userid);             
            session = NewHibernateUtil.getSessionFactory().getCurrentSession();   
             tx = session.beginTransaction();   
            session.save(u);      System.out.println("Successfully ");   
            tx.commit();   

but i don't thing it will work. Can any one please tell me the write way to add data into this table

[Arpit Purohit]

The approach to use given auto generated classes to add record should be as follows:

           
LnUserGroup u = new LnUserGroup(new LnUserGroupId(userid,groupName));  
session = NewHibernateUtil.getSessionFactory().getCurrentSession();   
tx = session.beginTransaction();   
session.save(u);
System.out.println("Successfully ");   
tx.commit();