無法使用python在pgAdmin中添加QGIS多邊形

Question

我有一個csv ，其中包括一個easting和northing，easting2和northing2，easting3和northing3，以便在qgis中創建一個多邊形，所有的easting和northing屬性都是數字。

顯示代碼：

 import os
 import csv
 import psycopg2
 import time
 conn = psycopg2.connect (host="xxxx", database="xxxx", user="xxxx" 
 ,password="xxxx", port="xxxx")

 delete="ALTER Table highloading_qgis DROP COLUMN geom;"

 tem_delete="DELETE FROM public.highloading_qgis;"

 tem_carrier="copy highloading_qgis 
 FROM'/home/ftpuser/Report/highloading_new.csv' With DELIMITER ',' CSV  
 HEADER;"

 add_col="ALTER TABLE highloading_qgis ADD COLUMN geom geometry;"


 update_gpis="UPDATE highloading_qgis SET geom = 
(ST_MakePolygon(ST_GeomFromText('LINESTRING('Easting' 'Northing','Easting2' 
'Northing2','Easting3' 'Northing3')')));"

cursor = conn.cursor()
cursor.execute(delete)
cursor.execute(tem_delete)
cursor.execute(tem_carrier)
cursor.execute(add_col)
cursor.execute(update_gpis)
cursor.close()
conn.commit()
conn.close()

但是我在執行cursor.execute（update_gpis）時發現錯誤”

ProgrammingError: syntax error at or near "Easting"
LINE 1: ...om = (ST_MakePolygon(ST_GeomFromText('LINESTRING('Easting' '...

                                                   ^

任何人都可以幫助您糾正如何向pgadmin添加多邊形地物嗎？

Answer 1

我不是專家，但是我認為您至少需要4分才能獲得polygen，上面您只給出了3分。

您也可以嘗試下面給出的查詢，但不確定

update_gpis="UPDATE highloading_qgis SET geom = (ST_MakePolygon(ST_GeomFromText(ST_AsText(ST_MakeLine(Array[ST_MakePoint(Easting,Northing),ST_MakePoint(Easting2,Northing2),ST_MakePoint(Easting3,Northing3),ST_MakePoint(Easting4,Northing4)])))));"