#encoding:utf-8
from flask import Flask
from  flask_sqlalchemy import SQLAlchemy
import config

app = Flask(__name__)
app.config.from_object(config)
db = SQLAlchemy(app)

# 資料庫增刪改查（檢視函式中用db.session）
#用例項與表資料對應，避免用sql語句來進行增刪改查動作
#用類來進行表的對映，一個類就是一個表，一個例項就是一條資料，一個變數屬性就是一個欄位
class Article(db.Model): #一定要繼承db.Model
 
__tablename__ = 'article'
id = db.Column(db.Integer,primary_key = True,autoincrement = True)
    title = db.Column(db.String(100),nullable = False)
    content = db.Column(db.Text,nullable = False)

db.create_all
#*************************以上就是服務的開啟並監聽，建立了一個數據庫表Article****************
@app.route('/')
def 
 
hello_world():
    #增加
article1 = Article(title = 'aaa1',content = 'gx1')
    article2 = Article(title = 'bbb1',content = 'gx2')
    db.session.add(article1)
    db.session.add(article2)
    db.session.commit() #只要一訪問瀏覽器，正確返回了hello world，說明事物提交成功
    #查詢 sql為 select * from tbname where xxx = 'xxx'
result = Article.query.filter(Article.title == 'aaa1'
 
).first()   #這裡要用等號==
print result #返回的是例項物件
print result.title #取出物件的title
print result.content #取出物件content
    #改，先查詢出來，再來修改
result = Article.query.filter(Article.title == 'aaa1').first()
    print result
    result.title = 'aaa111' #將查詢出來的所有的title =='aaa1'的記錄，全部修改為'aaa111'
db.session.commit()

    #刪除 delete from article where content =='bbb'
    #操作步驟：先查後刪除
result = Article.query.filter(Article.content == 'gx1').first()
    db.session.delete(result)
    db.session.commit()
    return "hello world"
if __name__ == '__main__':
    app.run(debug=True)

以下是用到的配置檔案config.py

#encoding:utf-8
#dialect+driver://username:[email protected]：port/database
DIALECT = 'mysql'
DRIVER = 'mysqldb'
USERNAME = 'root'
PASSWORD = 'root'
HOST = '127.0.0.1'
PORT = '3306'
DATABASE = 'db_demo2'
#mysql 不會認識utf-8,而需要直接寫成utf8
SQLALCHEMY_DATABASE_URI = "{}+{}://{}:{}@{}:{}/{}?charset=utf8".format(DIALECT,DRIVER,
                                                                        USERNAME,PASSWORD,HOST,PORT,DATABASE)
SQLALCHEMY_TRACK_MODIFICATIONS = True