you are right. it was just an example
On May 25, 12:45 am, Alexey Nezhdanov <[email protected]> wrote:
> I think that's handy. Dropping cross-db compartibility is bad indeed,
> but you just need to have a big warning in the place where user have
> to make that choice.
>
> Also - I don't think that you can safely replace ' with " on pickled
> object. Most likely you are ruining it. Either proper sql escaping
> should be introduced or better yet - base64 encoding. If I am not
> mistaken - pickled objects are binary.
>
> On May 25, 9:17 am, mdipierro <[email protected]> wrote:
>
> > I do not know if this is a good idea and I'd like to hear your
> > opinions:
> > I have added in trunk to define custom column types
>
> > Here is an example of usage:
>
> > import cPickle
> > from gluon.sql import SQLCustomType
> > from decimal import Decimal
>
> > decimal = SQLCustomType(native='NUMERIC(10,2)',decoder=(lambda x:
> > Decimal(str(x))))
>
> > pickable = SQLCustomType(type='text',encoder=(lambda x:
> > "'%s'"%cPickle.dumps(x).replace("'","''")),decoder=(lambda x:
> > cPickle.loads(x)))
>
> > db.define_table('test',
> > SQLField('my_decimal',type=decimal),
> > SQLField('my_pickle',type=pickable))
>
> > the SQLCustomType constructor takes the following arguments:
> > - type indicates how web2py sqlform should treat this field
> > - native indicates how the database should treat this field
> > - encoder indicates how to represent (and escape) a value in SQL
> > - decoder indicates how to process the value once it is extracted from
> > the database
>
> > It seems to work well with migrations. Of course using native=....
> > makes the custom table not portable across databases.
>
> > The implementation is not very clean but can be improved.
>
> > Is this a good idea?
>
> > Massimo
>
>
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