On Jul 22, 2:23 pm, Philip Semanchuk <[EMAIL PROTECTED]> wrote:
> I'm new to SqlAlchemy.
>
> I'm trying to implement saved searches, like a mail program folder
> that says, "Show me all emails received yesterday", or "All emails
> with 'grail' in the subject". One wrinkle is that my application
> permits user-supplied extensions, so I need to be able to define saved
> searches that involve arbitrary objects/tables that I didn't code.
> This is where I think SqlAlchemy can come to my rescue. Extension
> modules will be required to define their own mappers and I'll be able
> to use those maps to query the objects without knowing much about them
> in advance.
>
> Assuming I have code that creates a sqlalchemy.orm.query.Query object
> that describes the search I want to save, I can (almost) create a
> saved search via str(the_query.statement). I don't know where to find
> the parameters to that query, though. Can someone point me in the
> right direction? Obviously once I have the SQL + parameters it's not
> hard to save them a table somewhere.
>
> If anyone has done this type of thing before and has a better
> solution, I'm be happy to hear it. Storing SQL in the database seems
> inelegant, but if I'm to support searches on arbitrary objects/tables,
> I don't see a better solution.
>
the binds for any SQL expression are present if you say
statement.compile().params. There's a little bit on this in the
tutorial at http://www.sqlalchemy.org/docs/05/sqlexpression.html#sql_insert
.
The downside of storing SQL in the DB is that you're bound to an exact
SQL dialect as well as table structure. A higher level concept of
stored "filters" and such would alleviate that issue but is more
complicated to implement. Might be worth thinking about though. User-
defined extensions would also have to provide information regarding
their "filters" too. ("user-defined extension" is a vague term so its
not clear at what level these extensions are created, how strict of an
API/sandbox they have, etc).
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