From: | "karsten" <karsten(at)terragis(dot)net> |
---|---|
To: | <pgsql-general(at)lists(dot)postgresql(dot)org> |
Subject: | plphyton function - return each list value as a row ? |
Date: | 2020-07-25 21:41:50 |
Message-ID: | 158643D58A904CC4B08308BBF26DA513@terragispc |
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Thread: | |
Lists: | pgsql-general pgsql-sql |
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
);
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