Question

尝试使用psycopg2从wsgi文件连接到PostgreSQL时遇到500服务器错误。

import psycopg2

def application(environ, start_response):

try:
    conn = psycopg2.connect("database = testdb, user = postgres, password = secret")
execept:
    print "I am unable to connect to the database"

status = '200 OK'
output = 'Hello Udacity, Robert!'

response_headers = [('Content-type', 'text/plain'), ('Content-Length', str(len(output)))]
start_response(status, response_headers)

return [output]

Answer 1

创建数据库（在我的情况下为“ udacity”），一个表（在我的情况下为“ hello”）和人口（在我的情况下为“ Hello world”）之后：

# psql environment
CREATE DATABASE udacity;
CREATE TABLE hello(
word text);
INSERT INTO hello VALUES ('Hello world');

您必须安装python依赖项：

# shell environment
sudo apt install python-psycopg2 libpq-dev
sudo apt install python-pip
pip install psycopg2

然后，下一个 myapp.wsgi 脚本对我有用：

import psycopg2

def application(environ, start_response):
    status = '200 OK'
    output = 'Original message'

    response_headers = [('Content-type', 'text/plain'), ('Content-Length', str(len(output)))]
    start_response(status, response_headers)
    # DB connection
    try:
        connection = psycopg2.connect("dbname='udacity' user='ubuntu' host='localhost' password='udacity'")
        cursor = connection.cursor()
        cursor.execute("""SELECT * from hello""")
        rows = cursor.fetchall()
        for row in rows:
            output = row[0]
    except:
        output = 'E: Python script'
    return [output]

在wsgi文件中连接到PostgreSQL

1 个答案: