Question

这是我为使用psycopg2连接Postgresql而编写的代码。我的psql和pgadminIII也在运行。

import psycopg2

connection = psycopg2.connect(dbname="gps_heatmap",user="postgres",host="localhost",password="1234")
cursor = connection.cursor()

cursor.execute("DROP TABLE IF EXISTS roads")
cursor.execute("CREATE TABLE roads (" +
                   "id SERIAL PRIMARY KEY," +
                   "name VARCHAR," + 
                   "centerline GEOMETRY)")
cursor.execute("CREATE INDEX ON roads USING GIST(centerline)")

connection.commit()

但是出现以下错误：

 OperationalError                          Traceback (most recent call last)
    <ipython-input-14-03e3f214b83e> in <module>()
          1 import psycopg2
          2 
    ----> 3 connection = psycopg2.connect(dbname="gps_heatmap",user="postgres",host="localhost",password="1234",port="5432")
          4 cursor = connection.cursor()
          5 

C:\Users\*******\Anaconda3\lib\site-packages\psycopg2\__init__.py in connect(dsn, database, user, password, host, port, connection_factory, cursor_factory, async, **kwargs)
    162                 for (k, v) in items])
    163 
--> 164     conn = _connect(dsn, connection_factory=connection_factory, async=async)
    165     if cursor_factory is not None:
    166         conn.cursor_factory = cursor_factory

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?

我将pg_hbf.conf编辑为：主持所有0.0.0.0/0 md5

同样，重复同样的错误

Answer 1

<强>澄清

下面的答案被接受，但是，它不是问题的解决方案......问题是postgresql服务器配置为端口5433，而不是默认端口5432.这应该解决问题：

connection = psycopg2.connect(database="gps_heatmap", user="postgres", password="1234", host="localhost", port=5433)

原始回答

尝试将dbname="gps_heatmap"替换为database="gps_heatmap"，因为前者旨在用于连接字符串，而后者则将关键字参数传递给psycopg2.connect()：

connection = psycopg2.connect(database="gps_heatmap", user="postgres", host="localhost", password="1234")

或者您可以使用连接字符串：

connection = psycopg2.connect("dbname=gps_heatmap user=postgres host=localhost password=1234")

Answer 2

对我有用的是打开服务（在Windows中搜索），然后查找postgres服务：在我的情况下是postgresql-x64-10。

运行服务
重新启动服务

之后，错误消失了。

我的错误源于在PostgreSQL之后安装MySQL，我猜这些端口有什么变化，但这解决了。

连接拒绝Postgresql

2 个答案: