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本文實例講述了Python使用Flask-SQLAlchemy連接數據庫操作。分享給大家供大家參考，具體如下：

需要安裝flask

1	`pip install flask`

安裝Mysql-Python (這個是py的mysql驅動，這個在官方沒有win的支持，只有第三方才有py2.7的whl)

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

注：上述whl文件也可點擊此處鏈接下載到本地安裝：https://www.lfd.uci.edu/~gohlke/pythonlibs/

安裝 Flask-SQLAlchemy

1	`pipi install Flask-SQLAlchemy`

注意，如果出現了編碼問題，安裝的時候，有可能是終端的編碼有問題，我換成了git bash shell就沒問題了。

myflask.py

									#coding:utf-8

									from flask import Flask

									#安裝 python-mysql 因為沒有官方支持win版本，只有網上有whl下載

									#pip install flask_sqlalchemy

									from flask_sqlalchemy import SQLAlchemy

									import config #config.py導入

									app = Flask(__name__)

									app.config.from_object(config)  #SQLALchemy會自動從配置文件讀取那個固定的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) #開啟debug模式，這里如果出錯會直接有提示

config.py

									#coding:utf-8

									#dialect+driver://username:password@host:port/database

									DIALECT='mysql'

									DRIVER='mysqldb'

									USERNAME='root'

									PASSWORD='root'

									HOST='127.0.0.1'

									PORT='3306'

									DATABASE='flask0'

									#這個連接字符串變量名是固定的具體 參考 flask_sqlalchemy 文檔 sqlalchemy會自動找到flask配置中的 這個變量

									SQLALCHEMY_DATABASE_URI='{}+{}://{}:{}@{}:{}/{}?charset=utf8'.format(DIALECT,DRIVER,USERNAME,PASSWORD,HOST,PORT,DATABASE)

運行看控制臺：（有一些無關緊要的警告，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
cursor.execute(statement, parameters)
* Debugger is active!
* Debugger PIN: 164-312-281
* Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
127.0.0.1 - - [18/Oct/2017 16:01:03] "GET / HTTP/1.1" 200 -
127.0.0.1 - - [18/Oct/2017 16:01:04] "GET / HTTP/1.1" 200 -
127.0.0.1 - - [18/Oct/2017 16:01:06] "GET / HTTP/1.1" 200 -