Re: Persistence and inheritance : a noob question

From: Landry Soules (cayennem..mail.com)
Date: Tue Nov 28 2006 - 17:32:56 EST

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    Thanks for your answer, Michael.
    Actually i thought of having one table for Vip, one for Customer, and
    none for Person.
    Because Vip and Customer share some properties (first name, last name etc).
    Having 2 tables seems cleaner to me, but if your solution is well
    supported by Cayenne, why not ?
    Would you please have a small code example to help me understand how to
    implement it ?

    Thanks

    Landry Soules

    Michael Gentry a écrit :
    > Are you wanting multiple tables or a single table? Cayenne will
    > currently do a single table mapped to multiple Java classes pretty
    > well. You have to have a discriminator column (an int or a char, etc)
    > which Cayenne can use to detect which Java class to create. Such as 1
    > = Customer, 2 = VIP, etc.
    >
    > /dev/mrg
    >
    >
    > On 11/28/06, Landry Soules <cayennem..mail.com> wrote:
    >> Hello,
    >>
    >> I'm a new user of Cayenne, and am facing a design problem. Here it is :
    >> I would like to implement the following :
    >> - a Person abstract class (with first name, last name and so on
    >> properties), extended by Customer and Vip classes.
    >> In my mind, Person wouldn't be persistent, whereas Customer and Vip
    >> would, meaning having only customer and vip tables.
    >> Does this fit into the FAQ's CompositeVerticalInheritence, or does exist
    >> a simpler alternative, since i must admit i didn't understand how to use
    >> it ?
    >>
    >> Thanks
    >>
    >> Landry Soules
    >>
    >

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