提示：学习express，搭建管理系统
文章目录
- 前言
- 一、安装exceljs
- 二、新建config/exportExcel.js
- 三、修改dao/order.js
- 四、修改routes/order.js
- 五、添加商品到购物车
- 总结
前言
需求：主要学习express，所以先写service部分
一、安装exceljs
npm install exceljs --save
二、新建config/exportExcel.js
exportExcel.js
const Excel = require('exceljs');
const exportExcel = async (data)=>{
let workbook = new Excel.Workbook();
let worksheet = workbook.addWorksheet(data.userName+'-'+data.orderId);
worksheet.columns = [
{ header:'用户名', key:'userName' },
{ header:'订单号', key:'orderId' },
{ header:'订单总价', key:'orderTotal' },
{ header:'商户名称', key:'shopName' },
{ header:'商品名称', key:'goodsName' },
{ header:'规格', key:'specs' },
{ header:'数量', key:'count' },
{ header:'单个商品总价', key:'goodsTotal' },
{ header:'折扣', key:'preferential' },
]
let rows = [];
for(let i=0;i<data.goods.length;i++){
let oneGoods = data.goods[i];
worksheet.addRow({
userName: data.userName,
orderId: data.orderId,
orderTotal: data.total,
shopName: oneGoods.shopName,
goodsName: oneGoods.goodsName,
specs:oneGoods.specs,
count:oneGoods.count,
goodsTotal:oneGoods.total,
preferential:oneGoods.preferential,
});
}
// worksheet.addRow(rows);
// A列 从第2行开始--到data.goods.length+1行合并 因为头部占了一行 所以第二行开始 到n+1行结束
worksheet.mergeCells('A2:A+'+(data.goods.length+1));
worksheet.mergeCells('B2:B'+(data.goods.length+1));
worksheet.mergeCells('C2:C'+(data.goods.length+1));
//合并后的单元格文字水平垂直居中
worksheet.getCell('A2').style.alignment = worksheet.getCell('B2').style.alignment = worksheet.getCell('C2').style.alignment = { vertical: 'middle', horizontal: 'center' };
try{
await workbook.xlsx.writeFile(data.userName+'-'+data.orderId+'.xlsx');
return {
msg:'表格下载成功',
code:200,
success:false
}
}catch(err){
return {
msg:err,
code:500,
success:false
}
}
}
module.exports = exportExcel;
三、修改dao/order.js
dao/order.js
const { Op } = require("sequelize");
const OrderModel = require('../models/order');
const OrderItemModel = require('../models/orderItem');
const GoodsDao = require('../dao/goods');
const md5 = require("md5");
const secretKey = 'longlongago';
const errFun = (msg,data,code)=>{
return {
code:code||500,
success:false,
msg:msg||'操作失败',
data:data
}
}
const sucFun = (data,msg)=>{
return {
code:200,
success:true,
msg:msg||'操作成功',
data,
}
}
const OrderDao = {
//添加商品到订单
addGoodsToOrder:async(data)=>{
const goods = data.goods;
//查看库存数量
let inventoryNotEnough = [];
const resultGoods = await GoodsDao.queryGoodsInventory(data)||[];
resultGoods.forEach(item=>{
goods.forEach(dItem=>{
if(item.goodsId == dItem.goodsId && item.inventory<dItem.count)inventoryNotEnough.push(item);
})
})
if(inventoryNotEnough.length>0)return errFun('以下商品库存不足',inventoryNotEnough);
//生成orderId
const orderId = md5(goods.userId + secretKey + new Date().getTime());
//订单总价
let orderTotal = 0;
//商品total错误
let wrongTotalGoodsData = [];
//订单里存入商品信息
let jsonGoods = [];
//orderItem存入信息
let orderItemGoods = [];
goods.forEach(item=>{
let preferential = item.preferential||[];
if(preferential.length>0){
preferential.forEach(pItem=>{
let nowTotal = parseFloat((item.goodsTotal||(item.price*item.count)).toFixed(2));//Math.round((item.goodsTotal||(item.price*item.count))*100)/100;
if(pItem.operation == 'x'){
item.goodsTotal = parseFloat((nowTotal*pItem.value).toFixed(2));//Math.round((nowTotal*pItem.value)*100)/100;
}else if(pItem.operation == '-'){
item.goodsTotal = parseFloat((nowTotal-pItem.value).toFixed(2));//Math.round((nowTotal-pItem.value)*100)/100;
}
})
}
//保留2位小数，向上取整
item.goodsTotal = parseFloat(item.goodsTotal.toFixed(2));//Math.round(item.goodsTotal*100)/100;
orderTotal = parseFloat((orderTotal+item.goodsTotal).toFixed(2));
if(item.goodsTotal != item.total)wrongTotalGoodsData.push(item);
jsonGoods.push({
goodsId:item.goodsId,
goodsName:item.goodsName,
price:item.price,
count:item.count
})
orderItemGoods.push({
orderId,
userId:data.userId,
userName:data.userName,
shopId:item.shopId,
shopName:item.shopName,
goodsId:item.goodsId,
goodsName:item.goodsName,
price:item.price,
count:item.count,
specs:item.specs,
preferential:JSON.stringify(item.preferential),
total:item.total,
})
});
// orderTotal = orderTotal/100;
if(wrongTotalGoodsData.length > 0)return errFun('以下商品总价计算错误！！',wrongTotalGoodsData);
if(orderTotal != data.total)return errFun('订单总价计算错误！！',{orderTotal,...data});
try{
let json = JSON.stringify(jsonGoods);
const orderResult = await OrderModel.create({
orderId,
userId:data.userId,
userName:data.userName,
total:data.total,
goods:json,
});
if(!orderResult)return errFun('下单失败！！');
try{
const orderItemResult = await OrderItemModel.bulkCreate(orderItemGoods);
if(!orderItemResult)return errFun('子订单下单失败！！');
//修改下单商品库存 单纯调用 结果不影响下单成功
GoodsDao.changeOrderGoodsInventory(resultGoods,data);
return sucFun({
id: orderResult.id,
orderId: orderResult.orderId,
userId: orderResult.userId,
userName: orderResult.userName,
total: orderResult.total,
goods:orderItemResult
},'下单成功');
}catch(oiErr){
return errFun(err);
}
}catch(oErr){
return errFun('下单失败！！',oErr);
}
},
//通过orderId获取订单数据
queryOrderByOrderId:async(data)=>{
try{
const orderData = await OrderModel.findOne({where:{orderId:data.orderId}});
try{
const orderItemData = await OrderItemModel.findAll({where:{orderId:data.orderId}});
console.log(orderItemData)
if(orderData&&orderItemData){
return sucFun({
id: orderData.id,
orderId: orderData.orderId,
userId: orderData.userId,
userName: orderData.userName,
total: orderData.total,
goods:orderItemData
},'订单查询成功');
}
}catch(err){
return errFun('订单查询失败！！',oErr);
}
}catch(err){
return errFun('订单查询失败！！',oErr);
}
},
//通过商品ID查询商品信息
queryGoodsByUserIdFromOrder:async(data)=>{
//根据goodsId查询goods
const goodsData = await OrderModel.findAll({where:{userId:data.userId}});
let shopIds = [];
let resultData = [];
if(goodsData&&goodsData.length>0){
goodsData.forEach(item=>{if(shopIds.indexOf(item.shopId)==-1)shopIds.push(item.shopId)});
goodsData.forEach(item=>{
let index = shopIds.indexOf(item.shopId);
let goodsOne = {
userId: item.userId,
shopId: item.shopId,
shopName: item.shopName,
goodsId: item.goodsId,
goodsName: item.goodsName,
count: item.count,
price: item.price,
specs: item.specs
}
if(!resultData[index]){
resultData[index] = {
shopId:item.shopId,
shopName:item.shopName,
goods:[ goodsOne ]
}
}else{
resultData[index].goods.push(goodsOne);
}
});
}
if(!resultData||await resultData.length<1)errFun('订单空空如也');
return sucFun(resultData,'查询成功');
},
}
module.exports = OrderDao;
四、修改routes/order.js
routes/order.js
const OrderDao = require('../dao/order');
const logistics = require('../config/logistics');
const exportExcel = require('../config/exportExcel');
const OrderRoutes = (router)=>{
router.post('/order/addGoodsToOrder',async (req,res)=>{
const result = await OrderDao.addGoodsToOrder(req.body);
res.json(result);
});
router.get('/order/queryGoodsByUserIdFromOrder',async (req,res)=>{
const result = await OrderDao.queryGoodsByUserIdFromOrder(req.query);
res.json(result);
});
router.post('/order/queryOrderByOrderId',async (req,res)=>{
const result = await OrderDao.queryOrderByOrderId(req.body);
res.json(result);
});
router.post('/order/queryOrderLogistics',async (req,res)=>{
const result = await logistics.query(req.body);
res.json(result);
});
router.post('/order/exportExcel',async (req,res)=>{
const orderResult = await OrderDao.queryOrderByOrderId(req.body);
let result = {code:500,success:false,msg:'导出excel失败'};
if(orderResult.success){
result = await exportExcel(orderResult.data);
}else{
result = orderResult;
}
res.json(result);
});
}
module.exports = OrderRoutes;
五、添加商品到购物车
url:http://localhost:1990/order/exportExcel
params:{
"orderId": "420cdcbd6ef3075f41c8613ff8bcf013"
}
总结
踩坑路漫漫长@~@
