> -----Original Message-----
> From: sqlalchemy@googlegroups.com
> [mailto:sqlalch...@googlegroups.com] On Behalf Of Aref
> Sent: 10 June 2010 02:40
> To: sqlalchemy
> Subject: [sqlalchemy] help please
>
> Hello All,
>
> I just began learning sqlalchemy and am not quite used to it yet so
> please excuse my ignorance and which might be a trivial question to
> some of you.
> I am writing a database module and need to load a table and possibly
> modify a record in the table. I can get the connection established and
> everything works fine. The problem I am running into is that I do not
> necessarily know the column name before hand to code it in the update
> method. I want to be able to find out to send a generic column name
> which will be updated (gets the column name dynamically).
>
> I tried the following:
>
> columns=['ProjectID', 'Program', 'progmanger']
> test = str('table.c.'+columns[1])
> update = table.update(test=='project-name', values = {test:'program'})
> print update
> update.execute()
>
> I get a error when I try to run it. It does not recognize the column
> for some reason even though if I print test everything seems to be OK.
> I get 'project.c.Program'
>
> Is there something I am missing here? How can I send the project and
> column name to the update method dynamically?
>
> Thank you so much in advance for any help or insight you
> could provide.
>
The "table.c" object supports dictionary-style access, so you should be
able to use something like this:
colname = 'Program'
column = table.c[colname]
update = table.update(column=='project-name', values =
{test:'program'})
However, in general, if you want to get a named attribute of an object,
and the name is stored in a variable, you can use Python's "getattr"
function. This code should also work:
colname = 'Program'
column = getattr(table.c, colname)
update = table.update(column=='project-name', values =
{test:'program'})
Hope that helps,
Simon
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