On Jul 30, 2007, at 2:11 AM, yish wrote:
>
> Hi, I decided to explore Pylons and was going through the QuickView
> tutorial when I came across a problem.
>
> I am getting the following exception:
>
> page = model.Page.get_by(title=u'FrontPage')
> Traceback (most recent call last):
> ....
> "SQLError: (ProgrammingError) ERROR: column "frontpage" does not
> exist
>
> SELECT pages.content AS pages_content, pages.title AS pages_title
> FROM pages
> WHERE pages.title = FrontPage ORDER BY pages.title
> LIMIT 1 'SELECT pages.content AS pages_content, pages.title AS
> pages_title \nFROM pages \nWHERE pages.title = %(pages_title)s ORDER
> BY pages.title \n LIMIT 1' {'pages_title': u'FrontPage'}"
>
> It looked to me that the sql query was not being properly generated.
> The "FrontPage" within the query should be escaped with single quotes,
> e.g:
> SELECT pages.content AS pages_content, pages.title AS pages_title
> FROM pages
> WHERE pages.title = 'FrontPage' ORDER BY pages.title
> LIMIT 1
>
> After trying the same query with "title" not defined as unicode i have
> no problems, e,g:
> page = model.Page.get_by(title='FrontPage')
> succeeds perfectly.
>
> Is this the expected unicode behavior for sqlalchemy?
yes. we dont "quote" or "escape" query arguments, we use bind
parameters as you can see in %(pages_title)s. Also, to indicate
that you'd like SQLAlchemy to convert unicode bind parameters to
strings, for compatibility with database APIs which don't accept
unicode strings (such as psycopg2), use the "convert_unicode=True"
flag sent to create_engine().
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