07-flask-使用sqlalchemy

Posted 2020-12-20 萌新瑟瑟发抖

代码

from flask import Flask, render_template
from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import Column, String, Integer
from sqlalchemy.orm import sessionmaker

app = Flask(__name__)
# 链接是需要指定要用到的mysql数据库
engine = create_engine(‘mysql+pymysql://root:123456@localhost:3306/flask_1?charset=utf8‘)  # mysql+pymysql://mysql账号:mysql密码@mysqlIP:mysql端口/数据库?charset=编码格式
Base = declarative_base()  # 生成SQLORM基类


class User(Base):
    # 对应MySQL中数据表的名字
    __tablename__ = ‘user‘

    # 创建字段
    id = Column(Integer, primary_key=True)
    user_id = Column(String(50), nullable=False)
    user_name = Column(String(50), nullable=False)
    head_img = Column(String(200))
    short_description = Column(String(300))


@app.route("/profile_v8/<user_id>")
def profile_v8(user_id):
    # 1. 查询数据库
    # 创建session对象
    DBSession = sessionmaker(bind=engine)  # 创建与数据库的会话，返回的是一个类
    session = DBSession()  # 生成链接数据库的实例

    # 获取返回数据的第一行
    obj = session.query(User).filter(User.user_id == user_id).one()  # session.query(表名)filter(条件)
    # 关闭session
    session.close()

    # 2. 模板渲染
    return render_template("profile.html", user_name=obj.user_name, head_img=obj.head_img, short_description=obj.short_description)


if __name__ == ‘__main__‘:
    app.run()