Relate:file.Update() using contraints in Source code (Dan Presnell )

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Par2: Relate:file.Update() using contraints in Source code
1998-09-19 -- Dan Presnell

I've found what's missing from the code.

When you are coding your source procedure, and you are changing the key
field contents of a parent file record, you have to issue this command
first, before you make the changes:

   relate:filename.save

This procedure call saves the current key contents to a buffer.  So the
code will be something like this:

   relate:cust.save
   cus:id=
   relate:cust.update

Note that access:filename.next() or other record retrieval procedures
will NOT do this field saving for you.  You have to do
relate:filename.save first, so that the RelationManager will know, on
the update call, that key fields have changed.

So my previous code, which was this:

  relate:cust.open()
  set(cust)
  loop
    if access:cust.next() then break.
    if 
       ! replace key field here
       relate:cust.update()
    end
  end
  relate:cust.close

...becomes this:

  relate:cust.open()
  set(cust)
  loop
    if access:cust.next() then break.
    if 
       relate:cust.save
       ! replace key field here
       relate:cust.update()
    end
  end
  relate:cust.close

... and everything works okay.

Warning.  I have not tested this in many circumstances.

If you look at the documentation for the RelationManager.save method,
you will see that it is pitifully inadequate and fails totally to
explain what the heck is going on.  Also, there is a lack of any
reference to the Save method in the documentation for the
RelationManager.Update method, which should be corrected.

Today is November 21, 2024, 3:44 am
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