RE: how to check uniqueness of uidNumber ?

["Howard Chu" <hyc@highlandsun.com>]

> -----Original Message-----
> From: Jim C [mailto:jcllings@tsunamicomm.net]

> The problem does not occur at the db level.  It occurs at the script
> level because one must first retrieve the uidNumber and then do the
> modify.  Between the two lines of code a race condition can possibly
> occur between scripts.  Here is an example function written in php:

No. You aren't reading carefully enough, and your script does not implement
the method that has been discussed in the original threads. There's a
difference between LDAPModify/Replace and LDAPModify/Delete. The correct
update, already described in detail in the previous threads, uses
LDAPModify/Delete and /Add. Your script uses Replace, which provides no
locking assurances. Read RFC2251 and don't come back until you've fully read
and understand the description of the LDAP Modify operation.

> Howard Chu wrote:
> There's more than one approach to solve a generic problem, you just have to
> understand the approach that LDAP supports.
> > http://www.openldap.org/lists/openldap-software/200208/msg00358.html

  -- Howard Chu
  Chief Architect, Symas Corp.       Director, Highland Sun
  http://www.symas.com               http://highlandsun.com/hyc
  Symas: Premier OpenSource Development and Support