在flask所在資料夾中新建一個models.py檔案，輸入以下程式碼

import pymysql

def get_conn():
    host = "127.0.0.1"
    port = 3306     #注：此處應該使用數字而不是字串
    db = 'learn_flask_mysql'
    user = 'root'
    password = ''
    conn = pymysql.connect(
        host=host,
        user=user,
        password=password,
        port=port,
        db=db,
    )
    return
 
 conn

class User(object):
    def __init__(self,user_id,user_name):
        self.user_id = user_id
        self.user_name = user_name

    def save(self):
        conn = get_conn()
        cursor = conn.cursor()
        sql = "INSERT INTO user(user_id, user_name) VALUES (%s,%s)"
        cursor.execute(sql,(self.user_id,self.user_name))
        conn.commit()
        cursor.close()
        conn.close()

    @staticmethod
 

    def query_all():
        conn = get_conn()
        cursor = conn.cursor()
        sql = "SELECT * from user"
        cursor.execute(sql)
        rows = cursor.fetchall()
        users = []
        for row in rows:
            user = User(row[0],row[1])
            users.append(user)
        conn.commit()
        cursor.close()
        conn.close()
        return
 
 users

    def __str__(self):
        return "id:{}  name:{}".format(self.user_id,self.user_name)

2.在flask新建資料夾中新建一個manage.py，並輸入以下程式碼

from flask_script import Manager
from learn_flask_mysql import app
from models import User

manager = Manager(app)

@manager.command
def save():
    user = User(1,'csdn')
    user.save()

@manager.command
def query_all():
    users = User.query_all()
    for user in users:
        print(user)


if __name__ == "__main__":
    manager.run()

之後使用python manage.py save即可儲存資料，使用python manage.py qurey_all即可查詢資料