Question

我尝试对我的postgres db运行SQL，

我通过的连接对象

import psycopg2
conn_string = "host='localhost' port='5432' dbname='postgres' user='postgres' password='mysecretpassword'"
conn = psycopg2.connect(conn_string)

似乎没问题

result = cursor.execute(
"""
select 
* 
from 
planet_osm_point limit 10
""")

结果是非类型，所以一定是出错了吗？

我做错了什么？我该怎么调试呢？

Answer 1

cursor.execute()仅执行查询，不会获取任何数据。要接收数据，您需要致电cursor.fetchall()或cursor.fetchone()。

import psycopg2
conn_string = "host = 'localhost' port = '5432' dbname = 'postgres' user = 'postgres' password = 'mysecretpassword'"
conn = psycopg2.connect(conn_string)
cursor.execute(
""" 
select 
* 
from 
planet_osm_point limit 10
""")

result = cursor.fetchall()

如何调试cursor.execute（psycopg2）是NoneType

1 个答案: