我正在Flask应用程序上进行本地开发,MySQL设置为在Vagrant上运行。使用PyMySQL和SQLAlchemy,我正在与mysql+pymysql://root:<password>@127.0.0.1:2222/<my_db>
连接。当我运行我的应用程序时,我收到以下错误:
sqlalchemy.exc.InternalError: (InternalError) Packet sequence number wrong - got 42 expected 0 None None
通过查看PyMySQL的GitHub存储库的一些问题,由于多线程而出现这种情况。 AFAIK我没有做任何具体的事情来将我的应用程序设置为多线程,所以我假设这是使用Flask或SQLAlchemy自动发生的。
FWIW我已经能够使用mysql+pysql://
使用的相同信息将Sequel Pro设置为在Vagrant上运行的SSH到SSH。使用简化的测试用例,我运行了我在SO answer中找到的代码并仍然遇到了同样的错误。
这是我的Vagrant文件:
Vagrant.configure("2") do |config|
config.vm.box_url = "http://files.vagrantup.com/precise32.box"
config.vm.network :forwarded_port, guest: 3306, host: 3306
config.vm.provision :shell, path: "bootstrap.sh"
config.vm.network "private_network", ip: "33.33.33.10", type: "dhcp", auto_config: false
end
这是我的bootstrap.sh
文件:
#!/usr/bin/env bash
sudo apt-get update
sudo debconf-set-selections <<< 'mysql-server-5.5 mysql-server/root_password password p<password>'
sudo debconf-set-selections <<< 'mysql-server-5.5 mysql-server/root_password_again password p<password>'
sudo apt-get update
sudo apt-get -y install mysql-server-5.5
if [ ! -f /var/log/databasesetup ];
then
sed -i "s/^bind-address/#bind-address/" /etc/mysql/my.cnf
echo "GRANT ALL ON *.* TO 'root'@'{99.99.99.99}' IDENTIFIED BY '<password>' WITH GRANT OPTION" | mysql -uroot -p<password>
echo "FLUSH PRIVILEGES" | mysql -uroot -p<password>
echo "CREATE DATABASE my_db" | mysql -uroot -p<password>
touch /var/log/databasesetup
if [ -f /vagrant/data/initial.sql ];
then
mysql -uroot -p<password> my_db < /vagrant/data/initial.sql
fi
sudo /etc/init.d/mysql restart
fi
if [ ! -h /var/www ];
then
rm -rf /var/www sudo
ln -s /vagrant/public /var/www
a2enmod rewrite
sed -i '/AllowOverride None/c AllowOverride All' /etc/apache2/sites-available/default
service apache2 restart
fi
这是我的app/__init.py__
文件:
from flask import Flask
from flask_sqlalchemy import SQLAlchemy
app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'mysql+pymysql://root:<password>@127.0.0.1:2222/my_db'
db = SQLAlchemy(app)
class User(db.Model):
id = db.Column(db.Integer, primary_key=True)
username = db.Column(db.String(80), unique=True)
email = db.Column(db.String(120), unique=True)
def __init__(self, username, email):
self.username = username
self.email = email
def __repr__(self):
return '<User %r>' % self.username
admin = User('admin', 'admin@example.com')
db.create_all() # In case user table doesn't exists already. Else remove it.
db.session.add(admin)
db.session.commit() # This is needed to write the changes to database
User.query.all()
User.query.filter_by(username='admin').first()
我的run.py
文件:
#!/usr/bin/env python
from app import app
app.run(debug=True)
根据我得到的错误,我正确连接但由于线程问题而遇到问题。我需要更改什么才能使PyMySQL与此设置一起使用?