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From Apache Wiki <wikidi...@apache.org>
Subject [Ws Wiki] Update of "WorkingWithCompoundKeys" by KevinWilliams
Date Thu, 12 Oct 2006 03:43:12 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Ws Wiki" for change notification.

The following page has been changed by KevinWilliams:
http://wiki.apache.org/ws/WorkingWithCompoundKeys

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+ ## page was renamed from CompoundKeys
  The RDB DAS provides the ability to work with single-column keys as well as [http://en.wikipedia.org/wiki/Compound_key
compound keys].  Keys must be identified to the DAS for two purposes: flushing changes to
the database and defining a relationship.  In either case, the keys can be single-colomn or
compound.
  
  We'll start with the first purpose: flushing changes to the database (also called "apply
changes processing").  As part of change summary processing, the DAS will generate a set of
INSERT, UPDATE and DELETE statements for execution against the database and these statements
require a primary key.  So, although the primary key definition is not required for reading
data, it is required for writeing data via apply changes processing.

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