On Apr 23, 2010, at 6:58 AM, Paul Balomiri wrote:
> Hi,
>
> Several days ago i has a similar question, which
> was, perhaps a bit too theoretical. Here is a simple case:
>
> select(text(select * from f(:time)) )
>
> can I supply alternatively either
> {time: datetime.datetime(1999,9,9,9,9,9)}
> or
> {time: " now()"}
> I cannot get around that sqlalchemy interprets " now()" as a string, while i
> try to use the postgres(or other backends) now() function.
bind parameters exist only for the purpose of specifying literal data to be
injected as the values into a SQL statement. They cannot be used to modify
the lexical structure of a statement. So a lexical unit like "CURRENT
TIMESTAMP" or "NOW()" is part of the statement's lexical source and cannot be
injected as a bind parameter.
To put it another way, bind parameters are not just string substitutions the
way something like "foo %s" % ('bar') is in Python, even though they may look
that way.
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