[DB-SIG] Next Version [was Re: Preparing statement API]

Stuart 'Zen' Bishop zen@cs.rmit.edu.au
Mon, 31 Jan 2000 10:56:35 +1100 (EST)

On Sun, 30 Jan 2000, M.-A. Lemburg wrote:

> Quoting is generally not needed since you pass in the data
> via bound parameters. The DB interface does the needed quoting
> (if any) without user intervention.

I have largish Perl program that couldn't function without it - sort of
a command line data miner. Now that I think of it, it probably could have
been written using named parameters (rather than positional - what generic 
PerlDBI supports). It would still be nice to access this though (eg. a GUI 
SQL query builder or DBA tool that needs to be able to show the generated 
HTML). Every DA needs the code, so it would be nice to access it :-)

> >     con.autocommit(1)
> >     mode = con.autocommit()
> > 
> >         As discussed above. An interesting point from the docs - 'Drivers
> >         should always default to AutoCommit mode. (An unfortunate choice
> >         forced on the DBI by ODBC and JDBC conventions.)'. I see no
> >         reason why we can't do it properly :-)
> See above... all drivers should default to auto-commit mode
> being *disabled*.

Yes - properly :-) Death to MySQL! *duck*.

> Not sure what you're talking about here... what issues were there ?

I'm not sure either :-) I seem to remember some discussion about transaction
starts, but I can't find it in the archives :-( It is either FUD, an
overactive imagination on my part, or relates to the following from 
http://www.zope.org/Members/petrilli/DARoadmap :

    self._begin - This is called at the beginning of every transaction.
    Depending on your database, and its implementation of "implicit
    transactions", you may or may not have to do anything here besides a

If the PyDB API states that a new transaction is implicitly started on 
connection, rollback or commit, or the first executable command afterwards, 
then self._begin in a ZopeDA->PyDB adaptor can just be 'pass'. This
might be part of the SQL spec - I'm not sure.

I can't think of any databases I've dealt with that self._begin would
be needed. Can anyone think of situations where it *is* needed? I think 
ZopeDA's need the call, as they are designed to support non-SQL databases 
as well such as IMAP, LDAP, plain text, ad infinitum.

   //     Zen (alias Stuart Bishop)     Work: zen@cs.rmit.edu.au
  // E N  Senior Systems Alchemist      Play: zen@shangri-la.dropbear.id.au
 //__     Computer Science, RMIT 	 WWW: http://www.cs.rmit.edu.au/~zen