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python flask实战订餐系统微信小程序-56提交訂單的後端功能實現

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提交訂單的後端功能實現

創建pay_order(在线购买订单表)以及pay_order_item(订单详情表)

use food_db
CREATE TABLE `pay_order` (
  `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
  `order_sn` varchar(40) NOT NULL DEFAULT '' COMMENT '随机订单号',
  `member_id` bigint(11) NOT NULL DEFAULT '0' COMMENT '会员id',
  `total_price` decimal(10,2) NOT NULL DEFAULT '0.00' COMMENT '订单应付金额',
  `yun_price` decimal(10,2) NOT NULL DEFAULT '0.00' COMMENT '运费金额',
  `pay_price` decimal(10,2) NOT NULL DEFAULT '0.00' COMMENT '订单实付金额',
  `pay_sn` varchar(128) NOT NULL DEFAULT '' COMMENT '第三方流水号',
  `prepay_id` varchar(128) NOT NULL DEFAULT '' COMMENT '第三方预付id',
  `note` text NOT NULL COMMENT '备注信息',
  `status` tinyint(4) NOT NULL DEFAULT '0' COMMENT '1:支付完成 0 无效 -1 申请退款 -2 退款中 -9 退款成功  -8 待支付  -7 完成支付待确认',
  `express_status` tinyint(4) NOT NULL DEFAULT '0' COMMENT '快递状态,-8 待支付 -7 已付款待发货 1:确认收货 0:失败',
  `express_address_id` int(11) NOT NULL DEFAULT '0' COMMENT '快递地址id',
  `express_info` varchar(1000) NOT NULL DEFAULT '' COMMENT '快递信息',
  `comment_status` tinyint(1) NOT NULL DEFAULT '0' COMMENT '评论状态',
  `pay_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '付款到账时间',
  `updated_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '最近一次更新时间',
  `created_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '插入时间',
  PRIMARY KEY (`id`),
  UNIQUE KEY `idx_order_sn` (`order_sn`),
  KEY `idx_member_id_status` (`member_id`,`status`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='在线购买订单表';
CREATE TABLE `pay_order_item` (
  `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
  `pay_order_id` int(11) NOT NULL DEFAULT '0' COMMENT '订单id',
  `member_id` bigint(11) NOT NULL DEFAULT '0' COMMENT '会员id',
  `quantity` int(11) NOT NULL DEFAULT '1' COMMENT '购买数量 默认1份',
  `price` decimal(10,2) NOT NULL DEFAULT '0.00' COMMENT '商品总价格,售价 * 数量',
  `food_id` int(11) NOT NULL DEFAULT '0' COMMENT '美食表id',
  `note` text NOT NULL COMMENT '备注信息',
  `status` tinyint(1) NOT NULL DEFAULT '1' COMMENT '状态:1:成功 0 失败',
  `updated_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '最近一次更新时间',
  `created_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '插入时间',
  PRIMARY KEY (`id`),
  KEY `id_order_id` (`pay_order_id`),
  KEY `idx_food_id` (`food_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='订单详情表';
CREATE TABLE `pay_order_callback_data` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `pay_order_id` int(11) NOT NULL DEFAULT '0' COMMENT '支付订单id',
  `pay_data` text NOT NULL COMMENT '支付回调信息',
  `refund_data` text NOT NULL COMMENT '退款回调信息',
  `updated_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '最后一次更新时间',
  `created_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
  PRIMARY KEY (`id`),
  UNIQUE KEY `pay_order_id` (`pay_order_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

生成對應的model文件

flask-sqlacodegen "mysql://root:123456@127.0.0.1/food_db" --tables pay_order --outfile "order/common/models/pay/PayOrder.py" --flask
flask-sqlacodegen "mysql://root:123456@127.0.0.1/food_db" --tables pay_order_item --outfile "order/common/models/pay/PayOrderItem.py" --flask
flask-sqlacodegen "mysql://root:123456@127.0.0.1/food_db" --tables pay_order_callback_data --outfile "order/common/models/pay/PayOrderCallbackData.py" --flask

創建完成后得到3個數據庫文件

20211010212153 - python flask实战订餐系统微信小程序-56提交訂單的後端功能實現

創建后 需要替換db

from application import db,app

order.py添加訂單創建請求的相應

from common.libs.pay.PayService import PayService

@route_api.route("/order/create", methods=[ "POST"])
def orderCreate():
    resp = {'code': 200, 'msg': '操作成功~', 'data': {}}
    req = request.values
    type = req['type'] if 'type' in req else ''
    note = req['note'] if 'note' in req else ''
    params_goods = req['goods'] if 'goods' in req else None

    items = []
    if params_goods:
        items = json.loads(params_goods)

    if len( items ) < 1:
        resp['code'] = -1
        resp['msg'] = "下单失败:没有选择商品~~"
        return jsonify(resp)

    member_info = g.member_info
    target = PayService()
    params = {
    }
    resp = target.createOrder( member_info.id ,items ,params)
    #如果是来源购物车的,下单成功将下单的商品去掉
    if resp['code'] == 200 and type == "cart":
        CartService.deleteItem( member_info.id,items )

    return jsonify( resp )

添加創建訂單接口

創建 PayService.py 文件

20211010205544 - python flask实战订餐系统微信小程序-56提交訂單的後端功能實現

# -*- coding: utf-8 -*-
import hashlib,time,random,decimal,json
from application import  app,db
from common.models.food.Food import Food
from common.models.food.FoodSaleChangeLog import FoodSaleChangeLog
from common.models.pay.PayOrder import PayOrder
from common.models.pay.PayOrderItem import PayOrderItem
from common.models.pay.PayOrderCallbackData import PayOrderCallbackData
from common.libs.Helper import getCurrentDate
from common.libs.food.FoodService import FoodService
class PayService():

    def __init__(self):
        pass

    def createOrder(self,member_id,items = None,params = None):
        resp = {'code': 200, 'msg': '操作成功~', 'data': {}}
        pay_price  = decimal.Decimal( 0.00 )
        continue_cnt = 0
        food_ids = []
        for item in items:
            if decimal.Decimal( item['price'] ) < 0 :
                continue_cnt += 1
                continue

            pay_price = pay_price +  decimal.Decimal( item['price'] ) * int( item['number'] )
            food_ids.append( item['id'] )

        if continue_cnt >= len(items ) :
            resp['code'] = -1
            resp['msg'] = '商品items为空~~'
            return resp

        yun_price = params['yun_price'] if params and 'yun_price' in params else 0
        note = params['note'] if params and 'note' in params else ''
        yun_price = decimal.Decimal( yun_price )
        total_price = pay_price + yun_price
        try:
            #为了防止并发库存出问题了,我们枷鎖with_for_update, 这里可以给大家演示下
            tmp_food_list = db.session.query( Food ).filter( Food.id.in_( food_ids ) )\
                .with_for_update().all()

            tmp_food_stock_mapping = {}
            for tmp_item in tmp_food_list:
                tmp_food_stock_mapping[ tmp_item.id ] = tmp_item.stock

            model_pay_order = PayOrder()
            model_pay_order.order_sn = self.geneOrderSn()
            model_pay_order.member_id = member_id
            model_pay_order.total_price = total_price
            model_pay_order.yun_price = yun_price
            model_pay_order.pay_price = pay_price
            model_pay_order.note = note
            model_pay_order.status = -8
            model_pay_order.express_status = -8
            model_pay_order.updated_time = model_pay_order.created_time = getCurrentDate()
            db.session.add( model_pay_order )
            #db.session.flush()
            for item in items:
                tmp_left_stock =  tmp_food_stock_mapping[ item['id'] ]

                if decimal.Decimal(item['price']) < 0:
                    continue

                if int( item['number'] ) > int( tmp_left_stock ):
                    raise Exception( "您购买的这美食太火爆了,剩余:%s,你购买%s~~"%( tmp_left_stock,item['number'] ) )

                # 刷視頻庫存
                tmp_ret = Food.query.filter_by( id = item['id'] ).update({
                    "stock":int(tmp_left_stock) - int(item['number'])
                })
                if not tmp_ret:
                    raise Exception("下单失败请重新下单")

                tmp_pay_item = PayOrderItem()
                tmp_pay_item.pay_order_id = model_pay_order.id
                tmp_pay_item.member_id = member_id
                tmp_pay_item.quantity = item['number']
                tmp_pay_item.price = item['price']
                tmp_pay_item.food_id = item['id']
                tmp_pay_item.note = note
                tmp_pay_item.updated_time = tmp_pay_item.created_time = getCurrentDate()
                db.session.add( tmp_pay_item )
                #db.session.flush()

                FoodService.setStockChangeLog( item['id'],-item['number'],"在线购买" )
            db.session.commit()
            resp['data'] = {
                'id' : model_pay_order.id,
                'order_sn' : model_pay_order.order_sn,
                'total_price':str( total_price )
            }
        except Exception as e:
            db.session.rollback()
            print( e )
            resp['code'] = -1
            resp['msg'] = "下单失败请重新下单"
            resp['msg'] = str(e)
            return resp
        return resp

    def geneOrderSn(self):
        m = hashlib.md5()
        sn = None
        while True:
            str = "%s-%s"%( int( round( time.time() * 1000) ),random.randint( 0,9999999 ) )
            m.update(str.encode("utf-8"))
            sn = m.hexdigest()
            if not PayOrder.query.filter_by( order_sn = sn  ).first():
                break
        return sn

提交成功了 數據庫也發生變化了

20211010224340 - python flask实战订餐系统微信小程序-56提交訂單的後端功能實現

20211010224403 - python flask实战订餐系统微信小程序-56提交訂單的後端功能實現

此時 購物車裏面的數據也被清空了

20211010224452 - python flask实战订餐系统微信小程序-56提交訂單的後端功能實現

美餐管理的庫存變更也實現了:

20211010225956 - python flask实战订餐系统微信小程序-56提交訂單的後端功能實現

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