Inserimento una matrice di punti in postgres pitone

Question

Ho una tabella, regione, definita

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

e vuoi inserire una riga in pitone. mi hanno una serie pgon

'{{-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.,-11.04712}}' 

place_id = 6, name = La mia linea di comando python "Samoa americane" è:

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

ma ottengo ValueError: "carattere formato non supportato', '(0x2c) all'indice 55 "

Ho inserito inserimenti prima, ma non con il punto [] nel target. Qualcuno può dirmi come dovrei farlo? Grazie.

Answer 1

create table t (p point[]); 

Utilizzando la 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.,-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

ho ottenuto questo correre. Il codice è sotto Il punto [] arriva a PG. Purtroppo sfortunatamente cur.fetchall() genera un'eccezione dopo cur.execute ("seleziona * dal 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