You mean that we cannot retrieve child classes usin an OQL statement that
query the parent class ?
If yes, it will be difficult to use Castor to persist the following
situation :
1 *
A ----- D
| |
--- ---
B C E F
B & C inherit from A, E & F inherit from D, an association 1-N exist
between
A & D, I map all classes into a table (6 tables).
I'm wrong with the Castor mechanism ?
-----Original Message-----
>Date: Thu, 8 Nov 2001 14:31:07 -0800
>From: "Thomas Yip" <[EMAIL PROTECTED]>
>Subject: RE: [castor-dev] Class cast and child class
>The jdoLoad() behavior is deprecated. The original support of polymorphic
method is removed.
>Please search the mail archive.
>Thomas
>-----Original Message-----
>>From: Gollot [mailto:[EMAIL PROTECTED]]
>>Sent: Thursday, November 08, 2001 6:20 AM
>>To: [EMAIL PROTECTED]
>>Subject: [castor-dev] Class cast and child class
>>
>>Hello,
>>
>>I tried, using the Castor JDO example, to load all Product objects
(Product
>>class) and to cast some of same into Computer class which is a derived
class
>>of the Product class.
>>
>>I tried this with this code :
>>
>>OQLQuery allProductsQuery = db.getOQLQuery("SELECT p FROM myapp.Product
>>p");
>> boolean isComputer = false;
>>
>> results = allProductsQuery.execute();
>> while (results.hasMore()) {
>> product = (Product)results.next();
>> if (product.getId() == 6) // 6 is a computer
>> isComputer = true;
>> writer.println(product.getId() + " : is a " +
>>product.getName() );
>> if (isComputer) {
>> Computer comp = (Computer)product;
>> writer.println(" CPU : " + comp.getCpu());
>> }
>>
>>In th jdoLoad method of Product class, a test is done on the name of the
>>product and if this name is a PC name, Computer.class is returned.
>>
>>The previous code does not work !!
>>
>>How can i do that ?
>>
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