Question

我想将我的数据导出到csv文件中，为此我在节点js中使用了fast-csv。它的工作正常我的代码是

var csv = require("fast-csv");
app.get('/file/exportToExcel', function(req, res) {
        var whereCondi = {
            'Id': req.query.id,
        }
        var response = {};
        table.find(whereCondi, function(err, tableData) {
            if (err) {
                response.status = 400;
                response.message = err.message;
                res.send(response);
            } else {
                var csvStream = csv.createWriteStream({headers: true}),
                writableStream = fs.createWriteStream("code.csv");
                writableStream.on("finish", function() {

                });
                csvStream.pipe(writableStream);
                for (var i = 0; i < tableData.length; i++) {
                    csvStream.write({allcodes: tableData[i].code});
                }
                csvStream.end();

            }
        });
    });

但问题是它保存了我的根文件夹中的csv文件我想在用户点击导出到excel时下载该csv文件请帮帮我。

Answer 1

writableStream = fs.createWriteStream("coupons.csv");

如果我正确理解你，这看起来就是你的问题。当前代码相对于app文件保存csv文件（基本上在你的情况下在同一目录中）。

尝试类似：

writableStream = fs.createWriteStream("./some/directory/coupons.csv");

Answer 2

您应该在目录中创建csv文件，然后以相同的方式将其删除

const express = require('express')
const objectstocsv = require('objects-to-csv')
const fs = require("fs")
const app = express()


var data = [
    {code: 'CA', name: 'California'},
    {code: 'TX', name: 'Texas'},
    {code: 'NY', name: 'New York'},
  ];

const PORT = process.env.PORT || 5000

app.get('/',async(req,res) => {
    const csv = new objectstocsv(data);
 
  // Save to file:
  await csv.toDisk('./test.csv');

// Download the file
  res.download("./test.csv",() => {

//Then delete the csv file in the callback
    fs.unlinkSync("./test.csv")
  })
})

如何在节点js中使用快速csv下载csv文件

2 个答案: