Instantiating

Question

Hello everybody!
I have created a class(neither distributed nor shared) definition where
there is only one attribute which is set to be private (to comply with good
OOA&D rules) and its value gets set via constructor during creation. I am
having problem just doing that. But if the attribute within that class is
public, then no problem. Seems to me that the parameter I am passing in the
init method has to be a class attribute with public access level. That
really puzzles me. Following is an excerpt of the code. If any of you have
an idea on this behavior, I would appreciate a response.
The class definition is as follows:
class Vendor
private textdata Id;
Init(string aId)
super.Init();
Id=new;
self.SetId(aId);
private SetId(string aId)
self.Id.SetValue(aId);
Some outside class in the same project, by the following lines of code:
anId:TextData=new;
anId.SetValue('something');
currVendor:Vendor=new( anId.Value);
During compilation I get an error for line 3 that says
syntax error:(last symbol: .).
thanks

Answer 1

In this case, the get is not really used any where. The set is used by
Forte internally to set the real attribute when it gets the data from
the DB. Since the virtual attribute name matches the column and the set
part of the virtual attribute actually sets the real attribute, the real
attribute gets set.
The get method of the virtual attribute is just to complete the code,
and if you want to use the virtual attribute in your code, the get will
be used to return the value stored in the real attribute.
Hope this clarifies.
Venkat Kodumudi
Price Waterhouse LLP
Internet: [email protected]
From: [email protected][SMTP:[email protected]]
Sent: Monday, September 08, 1997 10:18 AM
To: Venkat Kodumudi
Cc: [email protected]
Subject: RE: Instantiating
Hi!
How do you get the get to return the real attribute which is a
matching db
column. In my code, I will be returning all the rows ( approx 15) from
that
table. Therefore my select statement is without any where clause. How
will
the get will look like?
thanks
nipu
Original Text
From: C=US/A=INTERNET/DDA=ID/VKodumud(a)dsams.com, on 9/3/97 6:40 PM:
Why not. In that case, where you want your attribute to match the DB
column so that you can pass it directly in SQL, make use of Virtual
Attributes, where the name of the Virtual Attribute will match the
column in DB, the get will return the real attribute and the set will
call a method that will set the private attribute.
I have tested this and know it will work.
Venkat Kodumudi
Price Waterhouse LLP
Internet: [email protected]
From: [email protected][SMTP:[email protected]]
Sent: Wednesday, September 03, 1997 11:12 AM
To: Venkat Kodumudi
Subject: RE: Instantiating
Hi! I followed your suggestion and made the following changes. Ilike
it a
lot. But unfortunately this cannot be done everytime (Keepattributes
private )- incase of a class that is mapped to a database table rowto
do a
select directly into.
Thanks again.
Original Text
From: C=US/A=INTERNET/DDA=ID/VKodumud(a)dsams.com, on 9/3/97 8:54AM:
The method SetId cannot be private.
Venkat Kodumudi
Price Waterhouse LLP
Internet: [email protected]
From: [email protected][SMTP:[email protected]]
Sent: Tuesday, September 02, 1997 12:03 PM
To: [email protected]
Subject: Instantiating
Hello everybody!
I have created a class(neither distributed nor shared) definition
where
there is only one attribute which is set to be private (to complywith
good
OOA&D rules) and its value gets set via constructor during
creation.
I
am
having problem just doing that. But if the attribute within thatclass
is
public, then no problem. Seems to me that the parameter I am
passing
in the
init method has to be a class attribute with public access level.That
really puzzles me. Following is an excerpt of the code. If any ofyou
have
an idea on this behavior, I would appreciate a response.
The class definition is as follows:
class Vendor
private textdata Id;
Init(string aId)
super.Init();
Id=new;
self.SetId(aId);
private SetId(string aId)
self.Id.SetValue(aId);
Some outside class in the same project, by the following lines of
code:
anId:TextData=new;
anId.SetValue('something');
currVendor:Vendor=new( anId.Value);
During compilation I get an error for line 3 that says
syntax error:(last symbol: .).
thanks