deal! uploading.
On Oct 28, 12:42 pm, Alex Fanjul <alex.fan...@gmail.com> wrote:
> I agree with Jonathan, (find) and (exclude) are the best.
> Filter is like "let me this in the result" (just the opposite sense),
> and remove is like "real remove this from my database"
>
> So... '*Find*' this in my rows, BUT also *Exclude *this from my results!
>
> Alex F
>
> El 28/10/2009 18:23, Jonathan Lundell escribió:
>
>
>
> > On Oct 28, 2009, at 9:58 AM, mdipierro wrote:
>
> >> On a third thougth. Mr Freeze original names are better (find and
> >> filter it is).
>
> > Your use of 'filter' (or my confusion about it) for both cases
> > illustrates its ambiguity. How about 'find' and 'exclude'?
>
> >> I added slices too. Here is an example:
>
> >> b=DAL('sqlite://storage')
> >> db.define_table('a',Field('b'))
> >> db.a.insert(b='aaa')
> >> db.a.insert(b='aab')
> >> db.a.insert(b='abb')
> >> db.a.insert(b='bbb')
>
> >> ### return rows that match condition
> >> rows=db(db.a.id>0).select().find(lambda row: row.b>0)
>
> >> #### sort rows
> >> rows0 = rows.sort(lambda row: row.b.upper()):
>
> >> rows1=db(db.a.id>0).select()
> >> ### move matching rows from rows1 to rows2
> >> rows2=rows1.filter(lambda row: row.b>'b')
>
> >> ### get a slice of the rows
> >> rows3=rows[1:3]
>
> >> They can be mixed and matched
>
> >> rows=(rows1|rows2|rows3).find(..)[:].filter(..).sort(..)
>
> >> Now one implement at DAL level most functions missing on GAE like OR,
> >> LIKE, BELONGS.
>
> >> Massimo
>
> >> On Oct 28, 11:17 am, mdipierro<mdipie...@cs.depaul.edu> wrote:
>
> >>> Ok, I am going with filter (same as your find) and extract (same as
> >>> your filter with some changes to make it faster and issue that caused
> >>> it to skip some rows). In trunk now.
>
> >>> Massimo
>
> >>> On Oct 28, 10:51 am, "mr.freeze"<nat...@freezable.com> wrote:
>
> >>>> Now I'm confused :) What if you just changed the 'where' to 'find'
> >>>> and kept both. Filter should reduce the actual set, returning the
> >>>> removed rows. Find should just return the matched rows.
>
> >>>> On Oct 28, 10:15 am, mdipierro<mdipie...@cs.depaul.edu> wrote:
>
> >>>>> OK I just put the where function in trunk but renamed it filter
> >>>>> (sorry
> >>>>> for the confusion).
>
> >>>>> On Oct 28, 10:11 am, Joe Barnhart<joe.barnh...@gmail.com> wrote:
>
> >>>>>> I know, that's what I'm saying.... the word "where" suggests it
> >>>>>> is an SQL
> >>>>>> verb but it has nothing to do with SQL. I was just thinking it
> >>>>>> might be
> >>>>>> confusing to new users of w2p.
>
> >>>>>> On Wed, Oct 28, 2009 at 6:32 AM, mr.freeze
> >>>>>> <nat...@freezable.com> wrote:
>
> >>>>>>> No, anything post 'select' is done after the db call, including
> >>>>>>> first
> >>>>>>> () and last().
>
> >>>>>>> On Oct 28, 2:51 am, Joe Barnhart<joe.barnh...@gmail.com> wrote:
>
> >>>>>>>> I love the functionality, but doesn't calling the function
> >>>>>>>> "where"
> >>>>>>>> conjure up the SQL WHERE clause? I might think it was doing
> >>>>>>>> something
> >>>>>>>> with SELECT...WHERE in the underlying DB.
>
> >>>>>>>> -- Joe B.
>
> >>>>>>>> On Oct 27, 10:11 pm, "mr.freeze"<nat...@freezable.com> wrote:
>
> >>>>>>>>> Works! Would you be interested in these for sql.py Rows class?:
>
> >>>>>>>>> def where(self,f):
> >>>>>>>>> if not self.response:
> >>>>>>>>> return None
> >>>>>>>>> rows = []
> >>>>>>>>> for i in range(0,len(self)):
> >>>>>>>>> row = self[i]
> >>>>>>>>> if f(row): rows.append(self.response[i])
> >>>>>>>>> return Rows(self._db,rows,*self.colnames)
>
> >>>>>>>>> def filter(self,f):
> >>>>>>>>> if not self.response:
> >>>>>>>>> return None
> >>>>>>>>> rows = self.response
> >>>>>>>>> removed = []
> >>>>>>>>> for i in range(0,len(self)):
> >>>>>>>>> row = self[i]
> >>>>>>>>> if f(row):
> >>>>>>>>> removed.append(rows[i])
> >>>>>>>>> rows.remove(rows[i])
> >>>>>>>>> return Rows(self._db,removed,*self.colnames)
>
> >>>>>>>>> Example:
> >>>>>>>>> db.define_table('things',Field('category'))
> >>>>>>>>> rows = db(db.things.id>0).select()
> >>>>>>>>> tests = rows.where(lamdba row: row.category=="test") #
> >>>>>>>>> returns matches
> >>>>>>>>> rows.filter(lamdba row: row.category=="test")# removes and
> >>>>>>>>> returns
> >>>>>>>>> removed
>
> >>>>>>>>> On Oct 27, 10:49 pm, mdipierro<mdipie...@cs.depaul.edu> wrote:
>
> >>>>>>>>>> Thanks. Just fixed in trunk!
>
> >>>>>>>>>> On Oct 27, 10:35 pm, "mr.freeze"<nat...@freezable.com> wrote:
>
> >>>>>>>>>>> I get a syntax error when using this. I believe line 2926 of
> >>>>>>>>>>> Rows.__getitem__ needs to be changed from:
>
> >>>>>>>>>>> if i>= len(self.response) or i< 0:
>
> >>>>>>>>>>> ...to...
>
> >>>>>>>>>>> if i>= len(self.response):
>
> >>>>>>>>>>> since Rows.last() returns self[-1]
>
> --
> Alejandro Fanjul Fdez.
> alex.fan...@gmail.comwww.mhproject.org
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