flask——flask-sqlachemy的使用,模块划分

假设有两个类别的模块:admin和user模块

一、flask-sqlachemy的使用

1、使用建立mysql的连接

新建一个目录:app,以下操作全部在app目录下

a)新建config.py文件,写入以下内容

SQLALCHEMY_DATABASE_URI = 'mysql+pymysql://root:xxxxx@localhost:3306/test?charset=utf8'  # 使用pymysql建立连接
SQLALCHEMY_TRACK_MODIFICATIONS = True  

b)在app/__init__.py中写入

from flask import Flask, url_for, request, redirect, render_template
from flask_sqlalchemy import SQLAlchemy

app = Flask(__name__)
app.config.from_object('config')	# 完成app与配置文件的关联
db = SQLAlchemy(app)	# 生成一个可以操作app数据库的SQLAlchemy实例db

from app import models,views

2、创建model.py模块

from app import db 		# db是在app/__init__.py生成的关联后的SQLAlchemy实例

class User(db.Model):
    __tablename__ = 'users'
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(80), unique=True)
    email = db.Column(db.String(320), unique=True)
    password = db.Column(db.String(32), nullable=False)

    def __repr__(self):
        return '<User %r>' % self.username


class Admin(db.Model):
    __tablename__ = 'admins'
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(80), unique=True)
    email = db.Column(db.String(320), unique=True)
    password = db.Column(db.String(32), nullable=False)

    def __repr__(self):
        return '<User %r>' % self.username

3、创建create_db.py

from app import db
db.create_all()

表结构设计完成后执行python create_db.py即可完成表的创建

二、视图函数

1、user.py

from flask import Blueprint, render_template, redirect,request
from app import db
from .models import User

user = Blueprint('user',__name__)	 # 初始化当前视图函数的

@user.route('/index')
def index():
    return render_template('user/index.html')

@user.route('/add/',methods=['GET','POST'])		# 方式
def add():
    if request.method == 'POST':	
        p_user = request.form.get('username',None)		# 获取表单提交的值
        p_email = request.form.get('email',None)
        p_password = request.form.get('password',None)
		
		# 增
        obj = User(username=p_user, email=p_email, password=p_password)
		db.session.add(obj)
        db.session.commit()		# 提交操作
		
		# 删
		obj = User(username=p_user, email=p_email, password=p_password)
		db.session.delete(obj)
        db.session.commit()		# 提交操作
        
		# 查(此种方法,不存在返回None)
		result = User.query.filter_by(username=p_user).first()
		result_list = User.query.all()
		
		# 改
		User.query.filter_by(username=p_user).update({'username':'abc123'})
		
        return render_template('user/add.html',users=users)
	else:
		users = User.query.all()
		return render_template('user/add.html',users=users)

2、admin.py

from flask import Blueprint

admin = Blueprint('admin',__name__)

@admin.route('/index')
def index():
    return "hello,world!"

3、views.py

from app import app
from .admin import admin
from .user import user

app.register_blueprint(admin,url_prefix='/admin')
app.register_blueprint(user, url_prefix='/user')

三、运行

run.py

from app import app
app.run()

参考于:这里

posted @ 2018-02-02 16:31  想54256  阅读(316)  评论(0编辑  收藏  举报