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* plphyton function - return each list value as a row ?
@ 2020-07-25 21:26 karsten <karsten@terragis.net>
0 siblings, 2 replies; 4+ messages in thread
From: karsten @ 2020-07-25 21:26 UTC (permalink / raw)
To: pgsql-sql@lists.postgresql.org
Hi All,
I am trying to create my first plphyton function ( retrieving earthquake
data from an API) .
Overall I was able to get one single row to be returned, but am struggling
how to return the entire list I have as multiple rows - see below. Currently
I get the following error when running the GetEartquakeAll function:
select GetEartquakeAll('2020-01-01' ,'2020-03-01', -120, 40,200, 1.7)
gives me
ERROR: length of returned sequence did not match number of columns in row
How can I 'simply' return each list value as a row ?
Thanks
Karsten Vennemann
CREATE OR REPLACE FUNCTION GetEartquakeAll(start date ,stop date, lon float,
lat float,radius int, minmagnitude float) RETURNS equake_values AS $$
import urllib2
import json as json
data =
urllib2.urlopen('https://earthquake.usgs.gov/fdsnws/event/1/query?format=geo
json&starttime=%s&endtime=%s&latitude=%s&longitude=%s&maxradiuskm=%s&minmagn
itude=%s&orderby=magnitude' % (start,stop,lat,lon,radius,minmagnitude))
js_data = json.load(data)
equake = js_data
equakearray = []
a = 0
for i in equake['features']:
equakeplace = i['properties']['place'] # tile for earthquake location
magnitude = i['properties']['mag']
qlong = i['geometry']['coordinates'][0]
qlat = i['geometry']['coordinates'][1]
equakevalue = {"place": equakeplace, "magnitude": magnitude , "qlong":
qlong, "qlat": qlat}
equakearray.append(equakevalue)
a = a+1
return equakearray
$$ LANGUAGE plpythonu;
# create custom data type that is returned from equake data API query
CREATE TYPE equake_values AS (
place text,
magnitude float,
qlong float,
qlat float
);
^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: plphyton function - return each list value as a row ?
@ 2020-07-25 21:32 David G. Johnston <david.g.johnston@gmail.com>
parent: karsten <karsten@terragis.net>
1 sibling, 0 replies; 4+ messages in thread
From: David G. Johnston @ 2020-07-25 21:32 UTC (permalink / raw)
To: karsten <karsten@terragis.net>; +Cc: pgsql-sql@lists.postgresql.org <pgsql-sql@lists.postgresql.org>
On Saturday, July 25, 2020, karsten <karsten@terragis.net> wrote:
> Hi All,
>
> I am trying to create my first plphyton function ( retrieving earthquake
> data from an API) .
> Overall I was able to get one single row to be returned, but am struggling
> how to return the entire list I have as multiple rows - see below.
> Currently
> I get the following error when running the GetEartquakeAll function:
>
> select GetEartquakeAll('2020-01-01' ,'2020-03-01', -120, 40,200, 1.7)
> gives me
> ERROR: length of returned sequence did not match number of columns in row
>
> How can I 'simply' return each list value as a row ?
> Thanks
> Karsten Vennemann
>
> CREATE OR REPLACE FUNCTION GetEartquakeAll(start date ,stop date, lon
> float,
> lat float,radius int, minmagnitude float) RETURNS equake_values AS $$
>
The choice of mailing list for this is unusual as this seems to have
nothing to do with general SQL.
Anyway, you may find the following documentation section useful.
https://www.postgresql.org/docs/12/plpython-data.html#id-1.8.11.11.7
David J.
^ permalink raw reply [nested|flat] 4+ messages in thread
* plphyton function - return each list value as a row ?
@ 2020-07-25 21:41 karsten <karsten@terragis.net>
parent: karsten <karsten@terragis.net>
1 sibling, 1 reply; 4+ messages in thread
From: karsten @ 2020-07-25 21:41 UTC (permalink / raw)
To: pgsql-general@lists.postgresql.org
Hi All,
I am trying to create my first plphyton function ( retrieving earthquake
data from an API) .
Overall I was able to get one single row to be returned, but am struggling
how to return the entire list I have as multiple rows - see below. Currently
I get the following error when running the GetEartquakeAll function:
select GetEartquakeAll('2020-01-01' ,'2020-03-01', -120, 40,200, 1.7) gives
me
ERROR: length of returned sequence did not match number of columns in row
How can I 'simply' return each list value as a row ?
Thanks
Karsten Vennemann
CREATE OR REPLACE FUNCTION GetEartquakeAll(start date ,stop date, lon float,
lat float,radius int, minmagnitude float) RETURNS equake_values AS $$
import urllib2
import json as json
data =
urllib2.urlopen('https://earthquake.usgs.gov/fdsnws/event/1/query?format=geo
json&starttime=%s&endtime=%s&latitude=%s&longitude=%s&maxradiuskm=%s&minmagn
itude=%s&orderby=magnitude' % (start,stop,lat,lon,radius,minmagnitude))
js_data = json.load(data)
equake = js_data
equakearray = []
a = 0
for i in equake['features']:
equakeplace = i['properties']['place'] # tile for earthquake location
magnitude = i['properties']['mag']
qlong = i['geometry']['coordinates'][0]
qlat = i['geometry']['coordinates'][1]
equakevalue = {"place": equakeplace, "magnitude": magnitude , "qlong":
qlong, "qlat": qlat}
equakearray.append(equakevalue)
a = a+1
return equakearray
$$ LANGUAGE plpythonu;
# create custom data type that is returned from equake data API query
CREATE TYPE equake_values AS (
place text,
magnitude float,
qlong float,
qlat float
);
^ permalink raw reply [nested|flat] 4+ messages in thread
* RE: plphyton function - return each list value as a row ?
@ 2020-07-25 21:50 karsten <karsten@terragis.net>
parent: karsten <karsten@terragis.net>
0 siblings, 0 replies; 4+ messages in thread
From: karsten @ 2020-07-25 21:50 UTC (permalink / raw)
To: pgsql-general@lists.postgresql.org
Answering my own question I got it to work by a tiny change add SETOF for
the return definition:
Cheers
Karsten
...
RETURNS SETOF equake_values AS $$
...
-----Original Message-----
From: karsten [mailto:karsten@terragis.net]
Sent: Saturday, July 25, 2020 14:42
To: pgsql-general@lists.postgresql.org
Subject: plphyton function - return each list value as a row ?
Hi All,
I am trying to create my first plphyton function ( retrieving earthquake
data from an API) .
Overall I was able to get one single row to be returned, but am struggling
how to return the entire list I have as multiple rows - see below. Currently
I get the following error when running the GetEartquakeAll function:
select GetEartquakeAll('2020-01-01' ,'2020-03-01', -120, 40,200, 1.7) gives
me
ERROR: length of returned sequence did not match number of columns in row
How can I 'simply' return each list value as a row ?
Thanks
Karsten Vennemann
CREATE OR REPLACE FUNCTION GetEartquakeAll(start date ,stop date, lon float,
lat float,radius int, minmagnitude float) RETURNS equake_values AS $$
import urllib2
import json as json
data =
urllib2.urlopen('https://earthquake.usgs.gov/fdsnws/event/1/query?format=geo
json&starttime=%s&endtime=%s&latitude=%s&longitude=%s&maxradiuskm=%s&minmagn
itude=%s&orderby=magnitude' % (start,stop,lat,lon,radius,minmagnitude))
js_data = json.load(data)
equake = js_data
equakearray = []
a = 0
for i in equake['features']:
equakeplace = i['properties']['place'] # tile for earthquake location
magnitude = i['properties']['mag']
qlong = i['geometry']['coordinates'][0]
qlat = i['geometry']['coordinates'][1]
equakevalue = {"place": equakeplace, "magnitude": magnitude , "qlong":
qlong, "qlat": qlat}
equakearray.append(equakevalue)
a = a+1
return equakearray
$$ LANGUAGE plpythonu;
# create custom data type that is returned from equake data API query
CREATE TYPE equake_values AS (
place text,
magnitude float,
qlong float,
qlat float
);
^ permalink raw reply [nested|flat] 4+ messages in thread
end of thread, other threads:[~2020-07-25 21:50 UTC | newest]
Thread overview: 4+ messages (download: mbox mbox.gz follow: Atom feed)
-- links below jump to the message on this page --
2020-07-25 21:26 plphyton function - return each list value as a row ? karsten <karsten@terragis.net>
2020-07-25 21:32 ` David G. Johnston <david.g.johnston@gmail.com>
2020-07-25 21:41 ` karsten <karsten@terragis.net>
2020-07-25 21:50 ` karsten <karsten@terragis.net>
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