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Python使用Flask-SQLAlchemy连接数据库操作示例

2020-02-15 22:18:28
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本文实例讲述了Python使用Flask-SQLAlchemy连接数据库操作。分享给大家供大家参考,具体如下:

需要安装flask

pip install flask

安装Mysql-Python (这个是py的mysql驱动,这个在官方没有win的支持,只有第三方才有py2.7的whl)

pip install MySQL_python-1.2.5-cp27-none-win_amd64.whl

注:上述whl文件也可点击此处链接下载到本地安装:https://www.lfd.uci.edu/~gohlke/pythonlibs/

安装 Flask-SQLAlchemy

pipi install Flask-SQLAlchemy

注意,如果出现了编码问题,安装的时候,有可能是终端的编码有问题,我换成了git bash shell就没问题了。

myflask.py

#coding:utf-8from flask import Flask#安装 python-mysql 因为没有官方支持win版本,只有网上有whl下载#pip install flask_sqlalchemyfrom flask_sqlalchemy import SQLAlchemyimport config #config.py导入app = Flask(__name__)app.config.from_object(config)  #SQLALchemy会自动从配置文件读取那个固定的URI字符串db=SQLAlchemy(app)db.create_all()@app.route('/')def hello_world():  return '你好世界'if(__name__=='__main__'):  app.run(debug=True) #开启debug模式,这里如果出错会直接有提示

config.py

#coding:utf-8#dialect+driver://username:password@host:port/databaseDIALECT='mysql'DRIVER='mysqldb'USERNAME='root'PASSWORD='root'HOST='127.0.0.1'PORT='3306'DATABASE='flask0'#这个连接字符串变量名是固定的具体 参考 flask_sqlalchemy 文档 sqlalchemy会自动找到flask配置中的 这个变量SQLALCHEMY_DATABASE_URI='{}+{}://{}:{}@{}:{}/{}?charset=utf8'.format(DIALECT,DRIVER,USERNAME,PASSWORD,HOST,PORT,DATABASE)

运行看控制台:(有一些无关紧要的警告,可以不管)

D:/Python27/python.exe D:/PythonProjects/learn0/myflask.py
D:/Python27/lib/site-packages/flask_sqlalchemy/__init__.py:794: FSADeprecationWarning: SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and will be disabled by default in the future.  Set it to True or False to suppress this warning.
  'SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and '
D:/Python27/lib/site-packages/sqlalchemy/engine/default.py:470: Warning: Incorrect string value: '/xD6/xD0/xB9/xFA/xB1/xEA...' for column 'VARIABLE_VALUE' at row 478
  cursor.execute(statement, parameters)
 * Restarting with stat
D:/Python27/lib/site-packages/flask_sqlalchemy/__init__.py:794: FSADeprecationWarning: SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and will be disabled by default in the future.  Set it to True or False to suppress this warning.
  'SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and '
D:/Python27/lib/site-packages/sqlalchemy/engine/default.py:470: Warning: Incorrect string value: '/xD6/xD0/xB9/xFA/xB1/xEA...' for column 'VARIABLE_VALUE' at row 478

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