Is there a way to download a csv file of the data from a SQL Server database table on button click in Angular

Question

I need to get all of the data in my SQL Server database table into a .csv file when I click a button in a front end Angular web page.

I have already wr

Answer 1

Since you have to display the data in your angular application the best solution is to send the data as json and the use the following npm package : https://www.npmjs.com/package/xlsx to convert the json to xlsx file or csv

Here is a sample service i have written for the same, just create this service and call the function where you need it :

excel.service.ts

import { Injectable } from '@angular/core';
import * as XLSX from 'xlsx';

@Injectable({
  providedIn: 'root'
})

export class ExcelService {

  constructor() { }


  jsonToExcelSheet(data: any[], file_name = 'temp.xlsx') {

    const workBook = XLSX.utils.book_new(); // create a new blank book
    const workSheet = XLSX.utils.json_to_sheet(data);
    let wscols = [{ wpx: 150 }, { wpx: 200 }, { wpx: 150 }, { wpx: 150 }];
    workSheet['!cols'] = wscols; // set cell width
    XLSX.utils.book_append_sheet(workBook, workSheet, 'data'); // add the worksheet to the book
    return XLSX.writeFile(workBook, file_name); // initiate a file download in browser

  }


  jsonToCSV(data: any[], file_name = 'temp') {

    const workBook = XLSX.utils.book_new(); // create a new blank book
    const workSheet = XLSX.utils.json_to_sheet(data);

    XLSX.utils.book_append_sheet(workBook, workSheet, 'data'); // add the worksheet to the book
    return XLSX.writeFile(workBook, `${file_name}.csv`); // initiate a file download in browser

  }




}

Now if you want to use this service just import it in the desired component.ts

import { ExcelService } from 'src/services/excel.service';

constructor(private _excelService: ExcelService){}

async downloadWorksheet() {

   let downloadData = {} // load your data here 

   // export the json as excelsheet
   await this._excelService.jsonToExcelSheet(downloadData);
}