The example is used for JDO and XML. If you run it you will see that it's working.
Please see:
example/jdo/mapping.xml
example/jdo/create.sql
example/jdo/test.java
example/myapp/Product.java
example/myapp/Computer.java
If you modify that example for your problem you will get:
create table A (
id int not null,
data varchar(200) not null,
);
create table B (
id int not null,
other varchar(200) not null
);
<class name="A" identity="id">
<map-to table="A"/>
<field name="id" type="integer">
<sql name="id" type="integer" />
</field>
<field name="data" type="string">
<sql name="data" type="varchar" />
</field>
</class>
<class name="B" extends="A" identity="id">
<map-to table="B" xml="computer" />
<field name="id" type="integer">
<sql name="id" type="integer" />
</field>
<field name="other" type="string">
<sql name="other" type="varchar"/>
</field>
</class>
public class A implements Persistent
{
private int _id;
public int getId() { return _id; }
public void setId(int id) { _id = id; }
private String _data;
public String getData() { return _data; }
public void setData(String data) { _data = data; }
private Database _db;
public void jdoPersistent(Database db) { _db = db; }
public void jdoTransient() { _db = null; }
public Class jdoLoad(short accessMode)
{
// You need to decide with any property
// of A if it is a A or a B object e.g.
if ( _data.indexOf("B") >= 0 ) return B.class;
return null;
}
public void jdoBeforeCreate(Database db) {}
public void jdoAfterCreate() {}
public void jdoStore(boolean modified) {}
public void jdoBeforeRemove() {}
public void jdoAfterRemove() {}
public void jdoUpdate() {}
}
public class B extends A
{
private String _other;
public String getOther() { return _other; }
public void setOther(String other) { _other = other; }
}
I have not setup the example on my database at the moment,
but as far as I understand the example b.id will be set to a.id
if you create a B object.
Ralf
----- Original Message -----
From: "Techeira, Vincent X -ND" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, March 13, 2003 5:48 PM
Subject: Re: [castor-dev] Loading Extended Objects
> The example doesn't use an identity and maps to XML, I have to use an identity since
> I'm mapping to a database.
>
> -----Original Message-----
> From: Ralf Joachim [mailto:[EMAIL PROTECTED]
> Sent: Thursday, March 13, 2003 4:27 AM
> To: [EMAIL PROTECTED]
> Subject: Re: [castor-dev] Loading Extended Objects
>
>
> Hi,
>
> did you take a look on castor JDO example. There is a class PC that extends class
> Product.
> Take care on the implementation of class Product that implements Persistent
> interface and
> overwrites jdoLoad() methode.
>
> Ralf
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