Question

我试图使用Flask-MySQLdb。每次我去一个页面时都会收到错误_mysql_exceptions.ProgrammingError: closing a closed connection。为什么这不起作用？

from flask import Flask, render_template, request, json
from flask_mysqldb import MySQL

application = Flask(__name__)
mysql = MySQL(application)

application.config['MYSQL_USER'] = 'root'
application.config['MYSQL_PASSWORD'] = 'password'
application.config['MYSQL_DB'] = 'db name'
application.config['MYSQL_HOST'] = 'localhost'
mysql.init_app(application)

@application.route('/')
def index():
    cur = mysql.connection.cursor()
    cur.execute("SHOW TABLES")
    rv= cur.fetchall()
    return str(rv)

if __name__ == "__main__":
    application.run()

Answer 1

您已在同一应用程序上初始化扩展程序两次。每次初始化时，它都会注册一个关闭连接的函数。因此，第二个函数关闭已由第一个注册函数关闭的连接。从application移除MySQL（最好）或移除对mysql.init_app的显式调用。

mysql = MySQL()
mysql.init_app(application)

Flask-MySQLdb引发_mysql_exceptions.ProgrammingError：关闭一个已关闭的连接

1 个答案: