使用psycopg2在python中連接到PostgreSQL時遇到問題

Question

我通過postgreSQL3 9.5版連接到數據庫時遇到問題。 但是，運行以下代碼后：

import psycopg2 as p

con = p.connect("dbname ='dvdrental' user = 'myusername' host ='localhost' password ='somepassword'")
cur = con.cursor()
cur.execute("select * from title")
rows = cur.fetchall()

我收到此錯誤消息：

psycopg2.OperationalError: could not connect to server: Connection refused 
(0x0000274D/10061)
Is the server running on host "localhost" (::1) and accepting
TCP/IP connections on port 5432?
could not connect to server: Connection refused (0x0000274D/10061)
Is the server running on host "localhost" (127.0.0.1) and accepting
TCP/IP connections on port 5432?

有關背景信息，我無意中下載了最新版本的PostgreSQL，並將其連接到5432部分。我需要它連接到PostgreSQL端口5433。我不知道該怎么做。 如何解決該數據庫問題？ 這是PostgreSQL問題還是python問題？

Answer 1

如果將port = '5433'添加到p.connect線怎么辦？

import psycopg2 as p

con = p.connect("dbname ='dvdrental' user = 'myusername' host ='localhost' password ='somepassword' port='5433'")
cur = con.cursor()
cur.execute("select * from title")
rows = cur.fetchall()

Answer 2

使用netstat （從shell）檢查postgres的監聽地址：

---

plasser@pisbak$ netstat -nl |grep 5432
tcp        0      0 0.0.0.0:5432            0.0.0.0:*               LISTEN     
tcp6       0      0 :::5432                 :::*                    LISTEN     
unix  2      [ ACC ]     STREAM     LISTENING     9002     /tmp/.s.PGSQL.5432
plasser@pisbak$ 

---

如果沒有任何顯示，則說明Postgres 沒有監聽端口5432。