https://www.cnblogs.com/wt7018/p/11617878.html
https://www.jianshu.com/p/b7704b6cb2ee (增删该查，看这个)
https://www.jianshu.com/p/1ba45bd6c351
用法:
Book.query.order_by(User.create_time.desc()).all()
Book.query.limit(2).all()
来源: https://segmentfault.com/a/1190000004618621
# coding=utf-8
from flask_sqlalchemy import SQLAlchemy
from flask import Flask
from sqlalchemy import Column,Integer,String,Boolean,Float
import sys
app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = \
'mysql+cymysql://root:root@localhost:3306/lucaxTest?unix_socket=/Applications/MAMP/tmp/mysql/mysql.sock'
db = SQLAlchemy(app)
#book模型，传入db核心对象把Book插入db
class Book(db.Model):
__tablename__ = 'Book'
#Integer数字类型,primary_key主键(不可能出现重复),autoincrement自增长
id=Column(Integer,primary_key=True,autoincrement=True)
#String字符串类型,最大50字符,nullable是否为空
title=Column(String(50),nullable=False)
#default当为空给他自动赋值
author=Column(String(50),default="未名")
db.create_all(app=app)
#插入数据
@app.route("/add/")
def Add():
article = Book(title="英语2", author="李四哥")
db.session.add(article)
db.session.commit()
return "霸气"
#查询数据
@app.route("/Check/")
def Check():
#查询所有返回的是数组
result = Book.query.all()
#指定某列的值输出
print (result[0].title,file = sys.stderr)
#条件查询
result =Book.query.filter( Book.id == '1' and Book.title== "老舍").all()
#模糊查询。# 参考https://blog.csdn.net/chenmozhe22/article/details/95494947
result =Book.query.filter( Book.id.like("%1%")).all()
print (result,file = sys.stderr )
return "霸气"
#修改数据
@app.route("/Update/")
def Update():
result = Book.query.filter(Book.id == '1').first()
result.title = '语文二册'
db.session.commit()
return "霸气"
#删除数据
@app.route("/Delect/")
def Delect():
result = Book.query.filter(Book.id == '1').first()
db.session.delete(result)
db.session.commit()
return "霸气"
app.run(debug=True)