python3-flask-4查询mysql

• 安装对应模块

pip3 install flask-sqlalchemy mysql-connector

• 安装mysql

详见： mysql安装方式

user_info列user_id,user_name

• 示例脚本

vim flask_mysql.py

#!/usr/bin/env python3
# -*- coding:utf-8 -*-
# python_version : python 3.7
# Author : taoyx
# Email : taoyx@taoyx.cc
 
 
import uuid
from flask import Flask
from flask_sqlalchemy import SQLAlchemy
 
def uuid_demo():
    uuid_4 = uuid.uuid4()
    uuid_id = ''.join(str(uuid_4).split('-'))
    return uuid_id
 
app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] ='mysql+mysqlconnector://root:123456@127.0.0.1:3306/flask_test?charset=utf8'
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
 
db = SQLAlchemy(app)
 
class user_info(db.Model):
    __tablename__ = 'user_info'
    user_id = db.Column('user_id', db.Integer, primary_key=True, unique=True, nullable=True)
    user_name = db.Column(db.String(255), unique=True, nullable=True)
 
    def __init__(self, user_id, user_name):
        self.user_id = user_id
        self.user_name = user_name
 
    def __repr__(self):
        return "{'user_id':'%s', 'user_name':'%s'}" % (self.user_id, self.user_name)
 
 
# 插入新数据
add_user = user_info(uuid_demo(), 'xiaoming')
db.session.add(add_user)
db.session.commit()
 
# 查询全部数据,并按照`user_name`列倒序查询
#xa = db.session.query(user_info).all()
xa = user_info.query.order_by(user_info.user_name.desc()).all()
 
print(xa)
 
# 查询指定数据,并按照`user_name`列倒序查询,并从第2条开始，查询共计5条数据
#x = db.session.query(user_info).filter(user_info.user_name == 'xiaoming').first()
x = host_info.query.filter(user_info.user_name == 'xiaoming').order_by(user_info.user_name.desc()).offset(2).limit(5).all()
print(y)
 
# 查询模糊数据,并按照`user_name`列倒序查询,并从第2条开始，查询共计5条数据
# 与'like'相比，'ilike'忽略大小写
#x = db.session.query(user_info).filter(user_info.user_name == 'xiaoming').first()
x = host_info.query.filter(user_info.user_name.ilike('xiao%')).order_by(user_info.user_name.desc()).offset(2).limit(5).all()
print(y)
 
# 更新数据
updata_user = host_info.query.filter(user_info.user_name == 'xiaoming').all()
updata_user.user_name = 'xiaohong'
db.session.commit()
 
# 删除数据
del_user = host_info.query.filter(user_info.user_name == 'xiaohong').all()
db.session.delete(del_user)
db.session.commit()

python3-flask-4查询mysql

原文：https://www.cnblogs.com/taoyuxuan/p/11846657.html