Two ways to correct:
1) Define b as "dependent" on a; this is done in the mapping file and is
pretty well documeneted (see FAQs);
2) Change the client code to the following:
b = new B();
b.setTitle("some title");
db.create(b); // <- Add this line.................................
a = new A();
a.setB(b);
db.create(a);
********************************************
Steve Ebersole
IT Integration Engineer
Vignette Corporation
512.741.4195
Visit http://www.vignette.com
********************************************
-----Original Message-----
From: David Rault [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, March 05, 2002 11:32 AM
To: [EMAIL PROTECTED]
Subject: [castor-dev] simple relation
hi everybody
i used to 'play' with castor 0.8.11
and i'm currently trying to update my skills with newer versions (0.9.3.9,
0.9.3.13 and latest cvs)
my problem is a very simple relation that works with 0.8.11 does not work
with the previously named versions
actually it partly works, and that's my problem, i don't see why it behaves
that way :
i (quickly) searched the mailing-list archive but saw nothing matching...
i'v got a my generic super class for persistent objects : Super
i've got 2 subclasses : A and B
A has a field of type B
here is the code :
******************************
public class Super implements Persistent {
private transient Database _database;
private int id;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public Super() {
super();
}
public void jdoPersistent(Database db) {
setDatabase(db);
}
/*
the other methods of Persistent are defined empty
not shown here for lisibility
*/
protected Database getDatabase() {
return _database;
}
protected void setDatabase(Database database) {
_database = database;
}
/** for backward compatibility with castor 0.8.11 */
public void jdoCreate() throws Exception {
jdoBeforeCreate(getDatabase());
}
}
******************************
public class A extends Super {
private B b;
public A() {
super();
}
public B getB() {
return b;
}
public void setB(B b) {
this.b = b;
}
public void jdoBeforeCreate(Database db) throws Exception {
if (getB() != null) {
if (getB().getId()==0) {
db.create(getB());
} else {
db.update(getB());
}
}
}
}
******************************
public class B extends Super {
private String title;
public B() {
super();
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
}
******************************
my mapping looks like this :
******************************
<?xml version="1.0"?>
<!DOCTYPE mapping PUBLIC "-//EXOLAB/Castor Mapping DTD Version 1.0//EN"
"http://castor.exolab.org/mapping.dtd"; >
<mapping>
<key-generator alias="mykeygen" name="MAX"></key-generator>
<class access="shared" identity="id"
name="com.sysdeo.persistence.castor.test.Super" key-generator="mykeygen">
<map-to table="super" xml="super"/>
<field direct="false" lazy="false" name="id" required="true"
type="integer">
<sql dirty="check" name="id" type="integer"/>
</field>
</class>
<class access="shared" identity="id"
name="com.sysdeo.persistence.castor.test.A" key-generator="mykeygen"
extends="com.sysdeo.persistence.castor.test.Super">
<map-to table="a" xml="a"/>
<field direct="false" lazy="false" name="id" required="true"
type="integer">
<sql dirty="check" name="id" type="integer"/>
</field>
<field name="b" direct="false" lazy="false" required="false"
type="com.sysdeo.persistence.castor.test.B">
<sql dirty="ignore" name="bId" />
</field>
</class>
<class access="shared" identity="id"
name="com.sysdeo.persistence.castor.test.B" key-generator="mykeygen"
extends="com.sysdeo.persistence.castor.test.Super">
<map-to table="b" xml="b"/>
<field direct="false" lazy="false" name="id" required="true"
type="integer">
<description>l'identifiant de tout objet</description>
<sql dirty="check" name="id" type="integer"/>
</field>
<field name="title" direct="false" lazy="false" required="false"
type="string">
<description>le titre de l'objet</description>
<sql dirty="check" name="title" type="varchar"/>
</field>
</class>
</mapping>
******************************
the id field is set by the key generator (here is a simple MAX algorithm but
i've got the same problem with
MySQL IDENTITY)
******************************
and finally here is what i try :
b = new B();
b.setTitle("some title");
a = new A();
a.setB(b);
db.create(a);
******************************
both 'a' and 'b' are persisted BUT the bId in 'a' is set to 0 in the
database
whereas the id of 'b' is set correctly in the B table
what have i missed ?
one constraint is that i don't want a reference to 'a' in 'b'
(only 'a' knows about 'b')
i've also tried to remove the common superclass (in case that would be some
locking for the id generation) : not better
thanks a lot for your help, i hope i gave enough details of my case
David
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