Fabian,
are you still having problems with this, or can I consider this to be resolved ?
Werner
On Mon, 18 Oct 2004 10:10:01 +0200, Fabian Wolff wrote:
>
>Hi,
>
>I hope you can me solving a problem with castor.:
>I have 2 Classes A and B where B depends on A. If I insert a new Object
>A the first time(incl. depended Object B) everything is alright. The
>Object seems to be persistent, because it is in the MySQL-Database.
>But if I want to insert a second Object A, I always get an Exception:
>org.exolab.castor.jdo.DuplicateIdentityException: Duplicate identity
>found for object of type Abhaengig with identity 28: an object with the
>same identity already exists in persistent storage
>
>But the new Object, which has to be inserted has the Value 29. The
>previous object (which I stored the first time) has the value 28.
>It seems to me, that castor wants to store this object again, incl. the
>new object. Does it mean, that the first object is already in the same
>transaction and transient? How could it be, that the first object is
>persistent and transient? Please can you tell me what I am doing wrong?
>
>
>a part of my Java-Code:
>
>
> SQLAccess(){
> sema = new Semaphore(1);
> jdo = new JDO();
> System.out.println("Database-Name: test");
> jdo.setDatabaseName( "test" );
> System.out.println("Config-File: database.xml");
> jdo.setConfiguration( "database.xml" );
> jdo.setClassLoader(getClass().getClassLoader());
>
> try{
> //Obtain a new database
> System.out.println("trying to open database");
> db = jdo.getDatabase();
> System.out.println("Database opened");
>...
>}
>
>
>
>boolean setBenutzer(Benutzer benutzer){
>
> try {
> sema.p();
> db.begin();
> String query="select o from Benutzer o WHERE
>regid="+benutzer.getRegid();
> System.out.println("Begin transaction");
> Query oql;
> QueryResults results=null;
> System.out.print("OQL> ");
> System.out.println("\""+query+"\"");
> oql=db.getOQLQuery(query);
> System.out.println("execute");
> results=oql.execute();
> System.out.println("done");
> if (!results.hasMore()) {
> System.out.println("Create Benutzer");
> db.create(benutzer);
> System.out.println("Created");
> db.commit();
> sema.v();
> }
> return true;
>.....
>}
>
>/*
>boolean setBenutzer(Benutzer benutzer){
> try {
> sema.p();
> db.begin();
>
> System.out.println("Create Benutzer");
> db.create(benutzer);
> System.out.println("Created");
> db.commit();
> sema.v();
> return true;
>
> }
>.....
>}
>*/
>
>I just call 2 times setBenutzer with different Benutzer Objects and get
>the Exception above. I tried it with both setBenutzer functions.
>If I search for Benutzer objects by making a select, the new inserted
>Benutzer Object also returns.
>(If I don't use the depend-relation and insert an Benutzer-Object, no error
>occures.)
>
>
>a part of my mapping file:
>
><class name="Benutzer" identity="regid">
><cache-type type="none"/>
><map-to table="benutzer" xml="Benutzer"/>
><field name="regid" type="integer">
><sql name="regid" type="integer"/>
><bind-xml name="regid" type="integer" node="attribute"/>
></field>
><field name="name" type="java.lang.String">
><sql name="name" type="varchar"/>
><bind-xml name="name" type="java.lang.String" node="element"/>
></field>
>
><!--- 1:n Relation mit Tabelle Abhaengig (Abhaengig depends on Benutzer)-->
><field name="abhaengig" type="Abhaengig" required="true"
>collection="vector">
><sql many-key="userid"/>
><bind-xml name="abhaengig" node="element"/>
></field>
>
>......
>
></class>
>
>
><class name="Abhaengig" identity="regid" depends="Benutzer">
><cache-type type="none"/>
><map-to table="abhaengig" xml="Abhaengig"/>
>
><field name="regid" type="integer">
><sql name="regid" type="integer"/>
><bind-xml node="attribute"/>
></field>
>
><field name="benutzer" type="Benutzer">
><sql name="userid"/>
><bind-xml name="benutzer" node="element" reference="true"/>
></field>
>
>
><field name="komisch" type="java.lang.String">
><sql name="komisch" type="varchar"/>
><bind-xml name="komisch" type="java.lang.String" node="element"/>
></field>
></class>
>
>
>I hope you can help me solving my problem and tell me what I am doing wrong.
>
>Thank you in advance
>Fabian Wolff
>
>
>
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