[sqlalchemy] Re: Tiny doc clarification request
On Thursday, November 8, 2018 at 12:45:57 PM UTC-5, Lele Gaifax wrote:
>
> But maybe I'm missing some detail on the "engine specific"
> implementations,
> where, say, "foo['string']" may be considered a very different operation
> than
> "bar[2]"...
>
Well that also has to do with whatever the object is
foo = {'string': value}
vs
bar = [1,2,3,4,5]
if you had in Python:
foo = {'string': None, 2: 'two'}
it should encode to json where the key is a string:
'{"2": "two", "string": null}'
With that being stated, I have no idea what happens in SqlAlchemy or the
various engines if you try to set `bar[2] = "two"'` when `bar` is a
hash/dict/object. something might raise an error, or `2` might be retyped
into the string `"2"`, or a database might possibly support an int as an
object key (I have no idea if any of these happen, just rambling on
potential compatibility points).
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[sqlalchemy] Re: Tiny doc clarification request
Jonathan Vanasco writes:
> is the list operation nested?
>
> i.e. the example states:
>
>-
>
>data_table.c.data[('key_1', 'key_2', 5, ..., 'key_n')]
>
>
> does that correspond to:
>
> ['key_1']['key_2']['5']['...']['key_n'] = foo
>
>
> If so, it might make sense to call the first two "toplevel index
> operations, by key or integer" and the latter "nested path operations".
Yes, that's how I "parsed" it: basically, the "two" distinct operations I see
are
a) simple "direct" lookup, be it either by string or by integer
b) "iterative"/"nested" lookup, one hop at a time over the provided sequence
But maybe I'm missing some detail on the "engine specific" implementations,
where, say, "foo['string']" may be considered a very different operation than
"bar[2]"...
ciao, lele.
--
nickname: Lele Gaifax | Quando vivrò di quello che ho pensato ieri
real: Emanuele Gaifas | comincerò ad aver paura di chi mi copia.
l...@metapensiero.it | -- Fortunato Depero, 1929.
--
SQLAlchemy -
The Python SQL Toolkit and Object Relational Mapper
http://www.sqlalchemy.org/
To post example code, please provide an MCVE: Minimal, Complete, and Verifiable
Example. See http://stackoverflow.com/help/mcve for a full description.
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