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Python使用Flask-SQLAlchemy連接數(shù)據(jù)庫(kù)操作示例

更新時(shí)間：2018年08月31日 11:44:56 作者：涵涵YH

這篇文章主要介紹了Python使用Flask-SQLAlchemy連接數(shù)據(jù)庫(kù)操作,簡(jiǎn)單介紹了flask、Mysql-Python以及Flask-SQLAlchemy的安裝方法,并結(jié)合實(shí)例形式分析了基于Flask-SQLAlchemy的數(shù)據(jù)庫(kù)連接相關(guān)操作技巧,需要的朋友可以參考下

本文實(shí)例講述了Python使用Flask-SQLAlchemy連接數(shù)據(jù)庫(kù)操作。分享給大家供大家參考，具體如下：

需要安裝flask

pip install flask

安裝Mysql-Python (這個(gè)是py的mysql驅(qū)動(dòng)，這個(gè)在官方?jīng)]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文件也可點(diǎn)擊此處鏈接下載到本地安裝：https://www.lfd.uci.edu/~gohlke/pythonlibs/

安裝 Flask-SQLAlchemy

pipi install Flask-SQLAlchemy

注意，如果出現(xiàn)了編碼問(wèn)題，安裝的時(shí)候，有可能是終端的編碼有問(wèn)題，我換成了git bash shell就沒(méi)問(wèn)題了。

myflask.py

#coding:utf-8
from flask import Flask
#安裝 python-mysql 因?yàn)闆](méi)有官方支持win版本，只有網(wǎng)上有whl下載
#pip install flask_sqlalchemy
from flask_sqlalchemy import SQLAlchemy
import config #config.py導(dǎo)入
app = Flask(__name__)
app.config.from_object(config)  #SQLALchemy會(huì)自動(dòng)從配置文件讀取那個(gè)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(cuò)會(huì)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(gè)連接字符串變量名是固定的具體 參考 flask_sqlalchemy 文檔 sqlalchemy會(huì)自動(dòng)找到flask配置中的 這個(gè)變量
SQLALCHEMY_DATABASE_URI='{}+{}://{}:{}@{}:{}/{}?charset=utf8'.format(DIALECT,DRIVER,USERNAME,PASSWORD,HOST,PORT,DATABASE)

運(yùn)行看控制臺(tái)：（有一些無(wú)關(guān)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 -