Question

我有一个 csv ，其中包括东向和北向，东向2和向北2，向东3和向北3，以在qgis中创建一个多边形，其中所有东向和北向属性都是数字。

代码显示：

 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()

但是我在执行cursor.execute（update_gpis）“

时发现错误

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

                                                   ^

任何人都可以帮助如何纠正向pgadmin添加多边形几何？

Answer 1

我不是这方面的专家。但我认为你需要至少4分的polygen。以上你只给了3分。

你也可以尝试下面给出的查询。但不确定

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)])))));"

无法使用python在pgAdmin中添加QGIS多边形

1 个答案: