[PD] [psql] object hand-holding

Hans-Christoph Steiner hans at eds.org
Tue Dec 11 00:07:49 CET 2007

On Dec 10, 2007, at 2:19 PM, Mike McGonagle wrote:

> On 12/10/07, Jamie Bullock <jamie at postlude.co.uk> wrote:
> PREPARE uses the '$' character as its placeholder identifier, and '$1'
> Jamie, after thinking about this, I don't think we should worry  
> about the specifics of the characters that we use, as long as we  
> can agree on what gets entered into a PD message box, the specific  
> instance of the external ('sqlite', 'psql', etc.) can handle the  
> conversion to what the specific database uses.
> From what I have seen on this thread, is it right that the '?'  
> syntax does NOT have an identifier following it? I think it would  
> be very helpful if we use identifiers in the SQL if only to make  
> the binding to the proper datatypes easier, as per my last email.

It seems many things use the "?" alone as the unnamed placeholder,  
but I only saw MySQL using ?name for named placeholders.  It does  
seem like a nicer syntax rather than using a different character.   
Perhaps, we should follow pgsql and use "$" and "$name", since "$" is  
already a marker for replacement vars in Pd.  I suppose that could  
get confusing in something like:

SELECT id, ABS(($duration - $1)/$2) AS error FROM datatable ORDER BY  
error LIMIT 1


> Mike
> -- 
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> everything we have, every quality, every strength, every dream,  
> every high ideal.
> —Yehudi Menuhin (1916–1999), musician
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