Question

我正在使用flask和flask-mysqldb 每次我要创建或执行sql查询时，光标都应在烧瓶路径内我想在其他功能而不是在路线中使用光标我也想定义一个光标，所以我不必在每个路径中键入相同的代码这是我的代码：

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

app = Flask(__name__)

# config the database connection
db = yaml.safe_load(open('db.yaml'))
app.config['MYSQL_HOST'] = db['mysql_host']
app.config['MYSQL_USER'] = db['mysql_user']
app.config['MYSQL_PASSWORD'] = db['mysql_password']
app.config['MYSQL_DB'] = db['mysql_db']

mysql = MySQL(app)

@app.route('/', methods=['GET', 'POST'])
def index():
    if request.method == 'POST':
        # get the inputs from the form
        user_details = request.form
        # the key value is from the html name attriput
        name = user_details['name']
        email = user_details['email']

        cur = mysql.connection.cursor()
        cur.execute(
            " INSERT INTO users(name,email ) VALUES(%s, %s)", (name, email))
        mysql.connection.commit()
        cur.close()
        return 'success'
    return render_template('index.html')

@app.route('/users')
def users():

    cur = mysql.connection.cursor()
    result_value = cur.execute(" SELECT * FROM users ")
    if result_value > 0:
        user_details = cur.fetchall()
        return render_template('users.html', user_details=user_details)

#convert users data to json file
def json_conv():
    cur = mysql.connection.cursor()
    cur.execute("SHOW GLOBAL STATUS")
    mysql.commit()
    rs = cur.fetchall()

    result = dict(rs)

    with open('users.json', 'w') as f:
        json.dump(result, f)

json_conv()

if __name__ == '__main__':
    app.run(debug=True)

注意：如果我运行该功能，则会弹出此错误：

Traceback (most recent call last):
  File "app.py", line 74, in <module>
    json_conv()
  File "app.py", line 64, in json_conv
    cur = mysql.connection.cursor()
AttributeError: 'NoneType' object has no attribute 'cursor'

如何在flask-mysqldb中使全局游标可变

0 个答案: