[mso] Re: Access 2003 - table updates

Further to this, it seems likely that what I need to be doing is setting up  
the properties for the Category_ID in the subform correctly. But that is what  
has me baffled. I've tried every combination I can think of, and it still  
doesn't work.
 
(And, by the way, Microsoft apparently calls an associate table a "junction  
table.")
 
 
In a message dated 7/29/2008 2:34:25 P.M. Eastern Daylight Time,  
Pruscoe@xxxxxxx writes:
You're  right Robert - it is many-to-many - I misspoke. And I have, indeed,   
implemented it with an associate table called Picture_Category_Xref.  The  
table 
contains 3 fields: an AutoNumber ID (primary key),  Product_ID and  
Category_ID. Referential integrity is turned off for  both joins (and that  
automatically 
turns off cascaded  updates/deletes anyway).

In the subform, I have left the two foreign  keys (picture_id and  
category_id) visible for debugging purposes.  And I'm finding that as soon  
as I select a 
category (it is a combo  box, driven by a query on the category  table), the 
category_id field  is populated with a NEW value (not the one that  
corresponds 
to the  existing category record). Then, when I save the master  record, I 
get a  
new associate table record (as expected), and - not surprisingly   given the 
evidence - a new record in the category table too. That is  the  problem.

Peter


In a message dated 7/29/2008  2:13:25 P.M. Eastern Daylight Time,  
robert.tillotson@xxxxxxxxxxxxxx  writes:
What you  are describing is really a many to many  relationship.  Each
picture  can have many categories and each  category can apply to  many
pictures.  This is normally  implemented with two one to  many
relationships and an associate  table.
Thus:
Many-to-many occurs  when both tables contain records  that are related to
more than one record.  Access doesn't directly  support a many-to-many
relationship, so you must  create a third  table: an "associate table." It
contains a primary key and a  foreign  key to each of the data tables.
After breaking down the  many-to-many  relationship, you have two
one-to-many relationships between  the  associate table and the two data
tables. 


If this is what   you really have, then you should check the joins between
the tables  and  deselect the cascade updates and deletions (and probably
the  referential  integrity - since it won't make sense) selections.

If  you have forced  some other arrangement, then you might want  to
consider converting to this  standard many-to-many  representation.

Robert  Tillotson
BAE-IT
Groton Field   Office
860-441-2207

-----Original Message-----
From:   mso-bounce@xxxxxxxxxxxxx [mailto:mso-bounce@xxxxxxxxxxxxx] On
Behalf  Of  Pruscoe@xxxxxxx
Sent: Tuesday, July 29, 2008 1:34 PM
To:   mso@xxxxxxxxxxxxx
Subject: [mso] Access 2003 - table updates

I   managed to solve the combo box problem by brute force -  deleting   the
form, and recreating it using the wizard. But now I've moved on   to
another issue.

The design of my database includes a table  of  pictures and a table of
categories. The picture/category  relationship is  one to many. I
implemented this  by creating a  cross-ref table that  contains a unique
ID, and pointers to the  picture and category tables. The  form (that the
wizard created)  for  pictures including a subform for  categories
generally  works. But when I add  a (picture) record with   related
categories, not only are records written  (correctly) to  the  picture and
cross-ref tables, but also to the category  table.  It  should not write
to the category table at  all.

I am at a loss to  know how to prevent this.  

Suggestions?


In a message dated  7/27/2008 9:31:22  P.M. Eastern Daylight Time,
Pruscoe@xxxxxxx writes:
I  must   confess that as an infrequent creator of Access databases   (and
forms)
I struggle a lot with what seems to me to be arcane   terminology.

I  have created a database including a main table  and  some subsidiary   
(lookup) tables. I have combo boxes  in the  form for the main table,
which are  tied to the lookup  tables.  Although the combo boxes display
the  values correctly  from the  subsidiary tables, when I select one it
is  not saved  in the  form.  
Conversely, if I create a record in the  main  table  manually, when I
bring up  that record in the  form, it does not   show the corresponding
value (from the  subsidiary table) in the  combo  box.

I have made this work  before, in a different database   (probably after
hours of  head-scratching) and I've compared the   properties of  the
DB/form/field that work with the ones that don't,   and I  can't see the
problem.

Any    suggestions?

Peter


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