[DB-SIG] paramstyle without knowing the database

wilk wilk at flibuste.net
Tue Dec 4 15:55:58 CET 2012

On 03-12-2012, M.-A. Lemburg wrote:
> On 03.12.2012 09:31, wilk wrote:
>> Hi,
>> I did a litle function to use the same paramstyle regardless of the 
>> paramstyle of the database. I transform one paramstyle to an other (a 
>> code missing in the lib standard isn't it ?)
> There are a few such libraries out there which take care of
> such conversions. 

Do you have a link to one that do only that ?

Thanks for the clue about dbapi 3.0

> The standard itself cannot provide an example
> implementation.
>> But of course i need to know the paramstyle of the database. I didn't 
>> found any way to retrieve it from the connexion. Did i missed 
>> something ?
> No, the standard only defines a per module global for the
> paramstyle.
> We might want to extend this to connections and cursors
> as well in DB APi 3.0, to make it easier to write such conversion
> routines, and then perhaps also make those attributes writable,
> so that the paramstyle can be adjusted on a per connection and
> cursor basis.
>> Is there a project to have one paramstyle mandatory for all the 
>> database ? I'm afraid that because there is not people will not use it 
>> at all and use manual string escape wich is a big security hole (i've 
>> seen that from people comming from php).
> For DB-API 3.0 there's a proposal to make support for the two
> paramstyles 'named' and 'qmark' mandatory (but leave all existing
> styles in the standard), or reduce the number of standard
> paramstyles to these two.

William Dodé
Informaticien Indépendant

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