Database Object

dear all,

straight to the point... i have this class

class Contract
{
private $id;
private $date;
private $c_number;

-- setter and getter --
}

class ContractCME extends Contract
{
private $tower_height;
private $shelter;
-- setter and getter --
}


class ContractCMD extends Contract
{
private $type;
private $brand;
-- setter and getter --
}

ok, both CME and CMD are contract, but differ in it's content, one is
tower and other is microwave. how to put the class into database ?
should i made a contract table , a cme and cmd one... ? any suggestion
?
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Re: Database Object

> ok, both CME and CMD are contract, but differ in it's content, one is
> tower and other is microwave. how to put the class into database ?
> should i made a contract table , a cme and cmd one... ? any suggestion
> ?

I'd have two tables because they are separate data relationships. One
for towers, one for microwaves.

Why would you need to keep the id's & dates separate to the other
information? Wouldn't each entity have a separate id (date's can
obviously be the same) ?

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