The deferred version of ZMySQLDA zope product.
This Zope Product is a deferred of ZMySQLDA and follows the same API.
The main difference with ZMySQLDA is that the execution
of SQL expressions is deferred and executed during the Zope
commit time rather than immediately. This allows for example
to group INSERT and DELETE statements in a very short amount of
time, which reduces risks of lock. It also allows to use
MyISAM tables without raising useless exception messages related
to the non transactional nature of MyISAM.