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xoo
 Post subject: need help with mapping problem on difficult datastructure
PostPosted: Thu Jan 04, 2007 6:15 pm 
Newbie

Joined: Thu Jan 04, 2007 5:55 pm
Posts: 4
Hello,

i have a simple Class named Graph which contains:
Code:
   private long id;
   private Set<Node> nodeSet = new HashSet<Node>();
   private Set<Edge> edgeSet = new HashSet<Edge>();

   get... set...


a Class named Edge which contains:
Code:
   private long id;
   private Node from;
   private Node to;
   private String value;

   get... set...


and a Class named Node which contains:
Code:
   private long id;
   private String value = "";

   private Set<Edge> incoming = new HashSet<Edge>();
   private Set<Edge> outgoing = new HashSet<Edge>();

   get... set...


I think i have a problem in understanding the configuration. I read the reference / the examples several times but I dont find a solution to store these Data Structure. I always get errors.

Can someone can give me a hint ?

Thanks,
Ralf

Hibernate version:
3.2.0

Mapping documents:
Node.hbm.xml
Code:
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
      "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
      "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
   <class name="de.neologics.network.graph.Node" table="Node">
      <id name="id" column="NODE_ID">
         <generator class="native"/>
      </id>
      <property name="value" column="Value" />

      <set name="incoming" >
         <key column="NODE_ID" />
         <many-to-many column="EDGE_ID" class="de.neologics.network.graph.Edge"/>
      </set>

      <set name="outgoing" >
         <key column="NODE_ID" />
         <many-to-many column="EDGE_ID" class="de.neologics.network.graph.Edge"/>
      </set>
      
   </class>
</hibernate-mapping>



Graph.hbm.xml
Code:
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
      "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
      "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
   <class name="de.neologics.network.graph.Graph" table="Graph">
      <id name="id" column="GRAPH_ID">
         <generator class="native"/>
      </id>

      <set name="nodeSet" table="NodeSet" cascade="none" >
         <key column="GRAPH_ID" />
         <many-to-many column="NODE_ID" class="de.neologics.network.graph.Node"/>
      </set>

      <set name="edgeSet" table="EdgeSet" cascade="none">
         <key column="GRAPH_ID" />
         <many-to-many column="EDGE_ID" class="de.neologics.network.graph.Edge"/>
      </set>
      
   </class>
</hibernate-mapping>


Edge.hbm.xml
Code:
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
      "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
      "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
   <class name="de.neologics.network.graph.Edge" table="Edge">
      <id name="id" column="EDGE_ID">
         <generator class="native" />
      </id>
      <property name="value" />
      
      <many-to-one name="from"
         column="NODE_ID" insert="false" update="false"
         class="de.neologics.network.graph.Node"/>
      <many-to-one name="to"
         column="NODE_ID" insert="false" update="false"
         class="de.neologics.network.graph.Node"/>

   </class>
</hibernate-mapping>



Code between sessionFactory.openSession() and session.close():
Code:
Graph p_oGraph = is initialized with some data.

session.beginTransaction();

if( true ){  // for test purposes
   for( Edge current  : p_oGraph.getEdgeSet() ){
      System.out.println("current = " + current);
      session.saveOrUpdate( current );
   }
   System.out.println("end edges loop");

   for( Node current  : p_oGraph.getNodeSet() ){
      System.out.println("current = " + current);
      session.saveOrUpdate( current );
   }
   System.out.println("end node loop");
   session.flush();
}   
session.saveOrUpdate( p_oGraph );
session.getTransaction().commit();


Full stack trace of any exception that occurs:
org.hibernate.StaleStateException: Batch update returned unexpected row count from update [0]; actual row count: 0; expected: 1

Name and version of the database you are using:
MySql 4.1
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asic
 Post subject: Let's see
PostPosted: Fri Jan 05, 2007 4:23 am 
Beginner
Beginner

Joined: Wed Aug 31, 2005 3:54 am
Posts: 45
To define the relationship between elements you must identify columns that are part of database foreign key constraint.

So for example :
Node must containt the foreign key to defined his Edge father

<hibernate-mapping>
<class name="de.neologics.network.graph.Node" table="Node">
<id name="id" column="NODE_ID">
<generator class="native"/>
</id>
<property name="value" column="Value" />

<set name="incoming" >
<key column="???" /> ==> the column of node table that identify Edge father
<many-to-one column="???" ==> the id column of edge
class="de.neologics.network.graph.Edge"/>
</set>

<set name="outgoing" >
<key column="???" /> ==> the column of node table that identify Edge father
<many-to-one column="???" ==> the id column of edge
class="de.neologics.network.graph.Edge"/>
</set>

</class>
</hibernate-mapping>

Don't forget to rate ... ;-)
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xoo
 Post subject: Re: Let's see
PostPosted: Fri Jan 05, 2007 7:26 am 
Newbie

Joined: Thu Jan 04, 2007 5:55 pm
Posts: 4
Hello,

thanx for your answer, but i found the Problem. I didnt misunderstood. The tables created by Hibernate are created in the right way.
I had a testroutine in which i created a example graph using the property id to detect, whether the node/edge is already in the graph and to determine inconsistency. For that test, I setted the id to a specific value. So it crashed, when i called the save routine.
My solution is, to create unique ids at creation of edge/node and check them against the graph.

Puh, hours of work...

Thanks,
Ralf Heyde
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