From: Oliver Elphick <olly@lfix.co.uk>
To: pgsql-interfaces@postgresql.org
Subject: PL/Python: How do I use result methods?
Date: Sat, 16 Oct 2004 15:34:29 +0100
Message-ID: <1097937269.12716.28.camel@linda> (raw)
I'm having my first try at a PL/Python function. It is also a first try
at Python, so the answer to this may be obvious.
According to the docs (8.0):
Calling plpy.execute with a query string and an optional limit
argument causes that query to be run and the result to be
returned in a result object. The result object emulates a list
or dictionary object. The result object can be accessed by row
number and column name. It has these additional methods: nrows
which returns the number of rows returned by the query, and
status which is the SPI_execute() return value.
What exactly is the syntax for using the nrows and status methods?
I am trying to use it like this:
...
arec = plpy.execute(plan, [ addrno ], 1)
plpy.info("Executed plan")
n = plpy.nrows(arec)
plpy.info(" got nrows")
...
This gives the output:
advacs=# select core.formatted_address(1);
INFO: ('Prepared plan',)
INFO: ('Executed plan',)
ERROR: plpython: function "formatted_address" failed
DETAIL: exceptions.AttributeError: 'module' object has no attribute 'nrows'
If I use
n = arec.nrows
the message becomes
DETAIL: exceptions.SystemError: error return without exception set
so how do you use it?
--
Oliver Elphick olly@lfix.co.uk
Isle of Wight http://www.lfix.co.uk/oliver
GPG: 1024D/A54310EA 92C8 39E7 280E 3631 3F0E 1EC0 5664 7A2F A543 10EA
========================================
"But be ye doers of the word, and not hearers only,
deceiving your own selves." James 1:22
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To: pgsql-interfaces@postgresql.org
Cc: olly@lfix.co.uk
Subject: Re: PL/Python: How do I use result methods?
In-Reply-To: <1097937269.12716.28.camel@linda>
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