Insert point array in postgres from python

Question

I have a table, area defined

place_id | integer | pts | point[] | region_name | text | region_id | integer | not null default nextval('region_region_id_seq'::regclass) 

and would like to insert a string from python. I have a pgon array

 '{{-171.01155,-11.05869},{-171.01116,-11.06022},{-171.01138,-11.07814},{-171.01708,-11.08953},{-171.01963,-11.09463},{-171.03217,-11.10509},{-171.04886,-11.10929},{-171.07441,-11.11013},{-171.09834,-11.10787},{-171.10588,-11.10552},{-171.12063,-11.10091},{-171.13384,-11.09055},{-171.13385,-11.09055},{-171.13386,-11.09054},{-171.13387,-11.09053},{-171.13386,-11.09053},{-171.13384,-11.09053},{-171.13383,-11.09053},{-171.13529,-11.08719},{-171.13966,-11.07717},{-171.14112,-11.07383},{-171.14113,-11.07382},{-171.14114,-11.07382},{-171.14115,-11.07382},{-171.14191,-11.06076},{-171.14118,-11.04661},{-171.14116,-11.04622},{-171.13745,-11.03009},{-171.12577,-11.0156},{-171.1114,-11.00379},{-171.09488,-10.9978},{-171.08485,-10.9975},{-171.07463,-10.9972},{-171.05771,-10.99903},{-171.05163,-11.00014},{-171.03634,-11.00291},{-171.03358,-11.00409},{-171.0279,-11.00652},{-171.01928,-11.01225},{-171.01876,-11.01339},{-171.01407,-11.0237},{-171.01238,-11.04712}}' 

place_id = 6, name = "American Samoa" My python command line:

 cur.execute("insert into region (place_id,pts,region_name) values (%,%,%)",(place_id, pgon, name)) 

But I get ValueError: "unsupported character", '(0x2c) with index 55 "

I did inserts before, but not with a dot [] in the target. Can someone tell me how should I do this? Thanks.

Answer 1

 create table t (p point[]); 

Using the adapter example from the documentation :

 from psycopg2.extensions import adapt, register_adapter, AsIs class Point(object): def __init__(self, x, y): self.x = x self.y = y def adapt_point(point): x = adapt(point.x).getquoted() y = adapt(point.y).getquoted() return AsIs("'(%s, %s)'" % (x, y)) register_adapter(Point, adapt_point) my_tuples_list = [(-171.01155,-11.05869),(-171.01116,-11.06022),(-171.01138,-11.07814),(-171.01708,-11.08953),(-171.01963,-11.09463),(-171.03217,-11.10509),(-171.04886,-11.10929),(-171.07441,-11.11013),(-171.09834,-11.10787),(-171.10588,-11.10552),(-171.12063,-11.10091),(-171.13384,-11.09055),(-171.13385,-11.09055),(-171.13386,-11.09054),(-171.13387,-11.09053),(-171.13386,-11.09053),(-171.13384,-11.09053),(-171.13383,-11.09053),(-171.13529,-11.08719),(-171.13966,-11.07717),(-171.14112,-11.07383),(-171.14113,-11.07382),(-171.14114,-11.07382),(-171.14115,-11.07382),(-171.14191,-11.06076),(-171.14118,-11.04661),(-171.14116,-11.04622),(-171.13745,-11.03009),(-171.12577,-11.0156),(-171.1114,-11.00379),(-171.09488,-10.9978),(-171.08485,-10.9975),(-171.07463,-10.9972),(-171.05771,-10.99903),(-171.05163,-11.00014),(-171.03634,-11.00291),(-171.03358,-11.00409),(-171.0279,-11.00652),(-171.01928,-11.01225),(-171.01876,-11.01339),(-171.01407,-11.0237),(-171.01238,-11.04712)] my_point_list = [Point(p[0], p[1]) for p in my_tuples_list] conn = psycopg2.connect(database='cpn') cursor = conn.cursor() insert = "insert into t (p) values (%s::point[])" cursor.execute(insert, (my_point_list,)) conn.commit() 

Answer 2

It works for me. The code is below. Point [] falls into PG. Now, unfortunately, cur.fetchall () throws an exception after cur.execute ("select * from test;")

 #!/usr/bin/python import psycopg2 from config import * dbname="test" try: dbconn = psycopg2.connect(dbname=dbname, host=dbHost, port=5432, user=dbUser,password=dbPassword) cur = dbconn.cursor() except: print "Error : Unable to open database\n" poly="-94.26958,33.56679 -94.26926,33.56763 -94.23197,33.55209" poly=poly.replace(" ",")\",\"(") poly="{\"("+poly+")\"}" try: cur.execute("drop table if exists test;"); cur.execute("CREATE TABLE test (id serial PRIMARY KEY, num integer, anum integer[],pt point, apt point[],nm text);") cur.execute("insert into test (num,apt,nm) values (%s,%s,%s) returning *",[1,poly,"fred"]) dbconn.commit() cur.execute("select * from test;") print cur.fetchall() except psycopg2.Error as e : print e.pgerror