python flask-sqlalchemy 查询功能，添加功能，删除功能_flask-sqlalchemy 删除

python代码

# 导入需要的模块
from flask import *
from flask_sqlalchemy import SQLAlchemy

# 创建 Flask 应用实例
app = Flask(__name__)


# 配置数据库连接信息
class Config:
    SQLALCHEMY_DATABASE_URI = 'mysql+pymysql://root:123456@localhost:3306/cardDB'
    SQLALCHEMY_ECHO = True


# 加载配置信息
app.config.from_object(Config)

# 创建数据库实例
db = SQLAlchemy(app)


# 定义 从表
class Cards(db.Model):
    __tablename__ = 'cards'
    cid = db.Column(db.Integer, primary_key=True, autoincrement=True)
    cnumber = db.Column(db.String(20), default=18900000000, nullable=False, unique=False)
    cPIN = db.Column(db.Integer, nullable=False, unique=False)
    cstate = db.Column(db.Integer, nullable=False)
    oid = db.Column(db.Integer, db.ForeignKey('operator.oid'), nullable=False)


# 定义 主表
class Operator(db.Model):
    oid = db.Column(db.Integer, primary_key=True, autoincrement=True)
    oname = db.Column(db.String(255), nullable=False)
    # 定义关系
    cards = db.relationship('Cards', backref='operator', uselist=True, lazy='dynamic')


# 创建表
@app.route('/')
def create_table():
    db.create_all()
    return '建表成功'


# 查询
@app.route('/query', methods=['GET', 'POST'])
def query():
    if reques