有没有办法通过单击 Angular 中的按钮从 SQL Server 数据库表中下载数据的 csv 文件 [英] Is there a way to download a csv file of the data from a SQL Server database table on button click in Angular

问题描述

当我单击前端 Angular 网页中的按钮时，我需要将我的 SQL Server 数据库表中的所有数据放入一个 .csv 文件中.

我已经用 C# 编写了一个 Web API 来访问 SQL Server 表中的所有数据并将其显示在我的网页中.当我点击一个按钮时，我需要能够下载一个 .csv 文件，其中的所有数据都显示在我的页面上.

导出类EmployeeService {url = 'https://localhost:44395/Api/Employee';构造函数(私有http:HttpClient){}getAllEmployee(): Observable{return this.http.get(this.url + '/AllEmployeeDetails');}}

保存

解决方案

由于您必须在 Angular 应用程序中显示数据，因此最好的解决方案是将数据作为 json 发送并使用以下 npm 包:https://www.npmjs.com/package/xlsx 将 json 转换为 xlsx 文件或 csv>

这是我为此编写的示例服务，只需创建此服务并在需要的地方调用函数:

excel.service.ts

import { Injectable } from '@angular/core';从 'xlsx' 导入 * 作为 XLSX；@Injectable({提供在:'根'})导出类 ExcelService {构造函数(){}jsonToExcelSheet(data: any[], file_name = 'temp.xlsx') {const workBook = XLSX.utils.book_new();//创建一个新的空白书const workSheet = XLSX.utils.json_to_sheet(data);让 wscols = [{ wpx: 150 }, { wpx: 200 }, { wpx: 150 }, { wpx: 150 }];workSheet['!cols'] = wscols;//设置单元格宽度XLSX.utils.book_append_sheet(workBook, workSheet, 'data');//将工作表添加到书中返回 XLSX.writeFile(workBook, file_name);//在浏览器中启动文件下载}jsonToCSV(data: any[], file_name = 'temp') {const workBook = XLSX.utils.book_new();//创建一个新的空白书const workSheet = XLSX.utils.json_to_sheet(data);XLSX.utils.book_append_sheet(workBook, workSheet, 'data');//将工作表添加到书中返回 XLSX.writeFile(workBook, `${file_name}.csv`);//在浏览器中启动文件下载}}

现在，如果您想使用此服务，只需将其导入所需的component.ts

import { ExcelService } from 'src/services/excel.service';构造函数(私有_excelService:ExcelService){}异步下载工作表(){let downloadData = {}//在此处加载您的数据//将 json 导出为 Excel 表格等待这个._excelService.jsonToExcelSheet(downloadData);}

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 written a Web API in C# to access all the data from the SQL Server table and display it in my web page. I need to be able to download a .csv file when I click a button with all that data in the table displayed on my page.

export class EmployeeService {

  url = 'https://localhost:44395/Api/Employee';
  constructor(private http: HttpClient) { }

  getAllEmployee(): Observable<Employee[]> {
    return this.http.get<Employee[]>(this.url + '/AllEmployeeDetails');
  }
}

Save

解决方案

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);
}

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