flask使用現有的數據表、在網頁中顯示數據

參考網站：https://blog.csdn.net/qq_42359659/article/details/102983515?utm_medium=distribute.pc_relevant_t0.none-task-blog-BlogCommendFromMachineLearnPai2-1.nonecase&depth_1-utm_source=distribute.pc_relevant_t0.none-task-blog-BlogCommendFromMachineLearnPai2-1.nonecase

config.py文件
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host = "127.0.0.1"
port = "3306"
database = "myself_weather"
username = "root"
password = "123456"
DB = 'mysql+pymysql://{}:{}@{}:{}/{}?charset=utf8'.format(username,password,host,port,database)
SQLALCHEMY_DATABASE_URI = DB

#設置數據庫追蹤信息,壓制警告
SQLALCHEMY_TRACK_MODIFICATIONS = True

exam.py文件
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from flask import Flask, render_template, redirect, url_for, request,session
from flask_sqlalchemy import SQLAlchemy
import config

app = Flask(__name__)

app.config.from_object(config)
# 創建SQLAlchemy類對象,關聯app
db = SQLAlchemy(app)

    # Grade 類名一般和表名一樣，不過要大寫

class Data_weather(db.Model):
    # grade 是表名
    __tablename__ = "data_weather"

    # 參數1:表示整數類型,  參數2:表示主鍵
    id = db.Column(db.Integer, primary_key=True)
    city = db.Column(db.String(50), nullable=False)
    ymd = db.Column(db.String(50), nullable=False)
    tianqi = db.Column(db.String(50), nullable=False)
    bWendu = db.Column(db.String(50), nullable=False)
    yWendu = db.Column(db.String(50), nullable=False)
    fenli = db.Column(db.String(50), nullable=False)
    fenxiang = db.Column(db.String(50), nullable=False)
    yer = db.Column(db.String(50), nullable=False)
    month = db.Column(db.String(50), nullable=False)

#查詢地方是咸陽的
user = db.session.query(Data_weather).filter(Data_weather.city=="咸陽").all()
for i in user:
    print(i.id,i.city,i.ymd)



if __name__ == '__main__':
    app.run(debug=True)