<vendor>
You can use an OR mapping product (like Cocobase or TopLink) to do this.
Depending on the shape and size of the object graphs you might have
performance issues.
An alternative is to use a pure object persistence mechanism like
GemStone/J's PCA.
</vendor>
Regards,
-Chris.
> -----Original Message-----
> From: [EMAIL PROTECTED] [SMTP:[EMAIL PROTECTED]]
> Sent: Wednesday, June 21, 2000 11:43 AM
> To: [EMAIL PROTECTED]
> Subject: Re: Store list, trees... with EJBs
>
> Hello,
>
> does anybody know how (and if is it possible) to store
> lists,trees,hashtables... using EJB and representing a tree, a list.. with
> an EJB? For example, when I've tried to do it with this CMP Entity Bean,
> the
> EJB server said me "I don't know how to map my_list to database" (I'm
> using
> WebLogic 5.1):
>
> class MyEJBLinkedList implements EntityBean {
> public Integer PK_MyEJBLinkedList; // The Primary Key
> public java.util.LinkedList my_list; // This is a
> Serializable object!!
>
> // The functions here are not important, the are very
> simple.
> }
>
>
> --------------------
> The problem is that the container can't save the hashtable straight into
> the database as it is. Depending on the column type you have chosen for
> this particular member.
>
> This is database specific usually. If you use cloudscape, the db server
> has
> the possibility to serialize the hashtable into the database. More
> "normal"
> databases such as Oracle and such, do not have this possibility and you
> have to serialize the hashtable yourself in the ejbStore and ejbLoad
> method.
>
> The best way however is to implement it as an BMP and build the hashtable
> yourself.
> Regards
> Erik Romson
>
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