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Superclass have only a autonumber.. is it possible?



 
 
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  #1  
Old March 7th, 2010, 02:28 PM posted to microsoft.public.access.tablesdbdesign
Micke__1
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Posts: 1
Default Superclass have only a autonumber.. is it possible?

Work with IT for many years, and have lately begun looking into DB and MS
Access. So Im quite a rookie in this area.

Ok,
Got a superclass named table1. That class has only one attribute, an ID
which is an auto number.

Then I have to subclasses called table2 and table3. They have the foreign
key to ID, and a couple of other attributes.

When I add a instance to my table2, I want it to add a new auto number in my
superclass, table1. eg a new instance in table1.Is this possible at all?

It seems that I need to first add to table1, and after that use that id in
table2 or table3, and that is not possible here.

any advice here?

br
Micke
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  #2  
Old March 7th, 2010, 04:28 PM posted to microsoft.public.access.tablesdbdesign
Jeff Boyce
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Posts: 1,555
Default Superclass have only a autonumber.. is it possible?

Since the value in table2 involves a foreign key pointing back to a record
in table1, oh wait, you don't have a record in table1 yet!

Yes, by all means, start the record in table1, then finish table2 details.

--

Regards

Jeff Boyce
Microsoft Access MVP

Disclaimer: This author may have received products and services mentioned in
this post. Mention and/or description of a product or service herein does
not constitute endorsement thereof.

Any code or pseudocode included in this post is offered "as is", with no
guarantee as to suitability.

You can thank the FTC of the USA for making this disclaimer
possible/necessary.

"Micke__1" wrote in message
...
Work with IT for many years, and have lately begun looking into DB and MS
Access. So Im quite a rookie in this area.

Ok,
Got a superclass named table1. That class has only one attribute, an ID
which is an auto number.

Then I have to subclasses called table2 and table3. They have the foreign
key to ID, and a couple of other attributes.

When I add a instance to my table2, I want it to add a new auto number in
my
superclass, table1. eg a new instance in table1.Is this possible at all?

It seems that I need to first add to table1, and after that use that id in
table2 or table3, and that is not possible here.

any advice here?

br
Micke



  #3  
Old March 10th, 2010, 12:18 AM posted to microsoft.public.access.tablesdbdesign
Piet Linden[_2_]
external usenet poster
 
Posts: 280
Default Superclass have only a autonumber.. is it possible?

FWIW, you might want to read Rebecca Riordan's article on how to do
super/subclassing in Access...

http://www.mvps.org/access/tables/tbl0013.htm

 




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