Re: Call plpgsql function with an array of custom type

On 06/11/2017 03:43 AM, Rory Campbell-Lange wrote:
> Hi
>
> I'm prototyping a database interface to be called from Python and PHP in
> one of our projects.
>
> The use case is selection grid where 0-many nodes may be selected. The
> x-axis is 0-6 (Sunday is 0, Saturday 6) and the y-axis is 0-many, but
> typically 0-3. To choose Tuesday, 2nd session you'd select (2, 1) for
> instance.
>
> I thought it might be good to use an array of a custom type (called
> dow_session) for this use case and other similar ones we have. I realise I
> could use integer arrays for this but I'm interested in experimenting with
> custom types; SQL at the bottom of the email.

>

>
> register_composite('test.dow_session', cur)
>
> But:
> query = 'select * from fn_test01(%s, %s)'
>
> qargs = (5, "[[0,2]::test.dow_session]")
> cur.execute(query, qargs)
> DETAIL: "[" must introduce explicitly-specified array dimensions.
>
> qargs = (5, "[[0,2]]::test.dow_session")
> cur.execute(query, qargs)
> DETAIL: "[" must introduce explicitly-specified array dimensions.
>
> qargs = (5, ["(0,2)::test.dow_session"])
> cur.execute(query, qargs)
> ProgrammingError: function fn_test01(integer, text[]) does not exist
>
> all don't work.

query = 'select * from fn_test01(%s, %s::dow_session[])'

qargs = (5, ["(0,2)", "(1, 3)"])

cur.execute(query, qargs)

rs = cur.fetchall()

rs

[('',)]

>
> Thoughts much appreciated.
>
> Kind regards
> Rory
>
>

--
Adrian Klaver
adrian(dot)klaver(at)aklaver(dot)com