Re: empty string in composite data types

On Mon, Dec 3, 2012 at 12:15 PM, Christian von Kietzell
<christian@vonkietzell.de> wrote:
> Hi,
>
> I noticed some (imho) odd behaviour while using composite data types.
> Empty strings will be returned as None instead of '' in Python.
>
> For example:
>
> sql> CREATE TYPE testtype AS (id INT, label TEXT);
>
> python> import psycopg2
> python> import psycopg2.extras
> python> db = psycopg2.connect(...)
> python> caster = psycopg2.extras.register_composite('testtype', db)
> python> cursor = db.cursor()
> python> cursor.execute("SELECT (1, '')::testtype")
> python> cursor.fetchone()[0]
> testtype(id=1, label=None)
>
> Is this behaviour intended? Or is there some flag I don't know about (I
> have found none) that gives me empty strings instead?

No, I'm afraid it's a bug. Could you please open a ticket in the
tracker? I'll take a look at it this evening.

-- Daniele