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From Jim Gallacher <jg.li...@sympatico.ca>
Subject Re: Session Benchmarks
Date Fri, 17 Jun 2005 14:55:07 GMT
Nicolas Lehuen wrote:
> 2005/6/17, David Fraser <davidf@sjsoft.com>:
> 
>>I don't know how it could be made good performance-wise, but it would be
>>great to have a generic database session store that you could pass a
>>Python DB-API connection object to. Of course, that would be difficult
>>to configure in the same way as the other session objects, but lots of
>>apps have already got a database connection open...
>>
>>David
>>
> 
> 
> Alas, programming in a DBMS-neutral way is not that easy in Python.
> Granted, the DB-API is standard for all its implementors, but the SQL
> resquest (be it DQL, DML or DDL) is usually DBMS-specific. And the
> fact that parameters escaping can be made in one of five ways (see
> paramstyle in http://www.python.org/peps/pep-0249.html) is not very
> helpful here.
> 
> So, writing a DBMS-neutral connection pool is feasable. Writing a
> DBMS-specific session store is feasable. But writing a DBMS-neutral
> session store is a bit of work.
> 

Probably the best way would be to have a SQLSession class that would be 
sub-classed for the specific DBMS, provide one or two common subclasses 
such as MySqlSession(SQLSession) and then leave it up to users to create 
their own subclasses for other DBMS. There differences between DBs is 
small enough that creating the subclasses should be trivial.

Jim


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