[web2py] patch to dal [Re: bug in SQLFORM?]

[Jose]

Replacing this:
self._db._execute('SELECT @@IDENTITY;')

whit:
self._db._execute("SELECT IDENT_CURRENT('%s');"%self._tablename)

for me it worked in a SQLServer 2000 server I do not know for other
versions of SQLServer.

With SELECT SCOPE_IDENTITY() there was an error because it was not
recognized.