forked from sheetjs/docs.sheetjs.com
118 lines
2.9 KiB
Markdown
118 lines
2.9 KiB
Markdown
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---
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sidebar_position: 9
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title: Databases
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---
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import current from '/version.js';
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import Tabs from '@theme/Tabs';
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import TabItem from '@theme/TabItem';
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## SQLite
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Most platforms offer a simple way to query `.sqlite` databases.
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The following example shows how to query for each table in an SQLite database,
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query for the data for each table, add each non-empty table to a workbook, and
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export as XLSX.
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[The Northwind database is available in SQLite form](https://github.com/jpwhite3/northwind-SQLite3/raw/master/Northwind_large.sqlite.zip).
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Download and expand the zip archive to reveal `Northwind_large.sqlite`
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<Tabs>
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<TabItem value="nodejs" label="NodeJS">
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1) Install the dependencies:
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```bash
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$ npm i --save https://cdn.sheetjs.com/xlsx-latest/xlsx-latest.tgz better-sqlite3
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```
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2) Save the following to `node.mjs`:
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```js title="node.mjs"
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/* Load SQLite3 connector library */
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import Database from "better-sqlite3";
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/* Load SheetJS library */
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import * as XLSX from 'xlsx/xlsx.mjs';
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import * as fs from 'fs';
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XLSX.set_fs(fs);
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/* Initialize database */
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var db = Database("Northwind_large.sqlite");
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/* Create new workbook */
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var wb = XLSX.utils.book_new();
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/* Get list of table names */
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var sql = db.prepare("SELECT name FROM sqlite_master WHERE type='table'");
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var result = sql.all();
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/* Loop across each name */
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result.forEach(function(row) {
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/* Get first 100K rows */
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var aoo = db.prepare("SELECT * FROM '" + row.name + "' LIMIT 100000").all();
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if(aoo.length > 0) {
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/* Create Worksheet from the row objects */
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var ws = XLSX.utils.json_to_sheet(aoo, {dense: true});
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/* Add to Workbook */
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XLSX.utils.book_append_sheet(wb, ws, row.name);
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}
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});
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/* Write File */
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XLSX.writeFile(wb, "node.xlsx");
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```
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3) Run `node node.mjs` and open `node.xlsx`
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</TabItem>
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<TabItem value="bun" label="Bun">
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1) Install the dependencies:
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```bash
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$ npm i --save https://cdn.sheetjs.com/xlsx-latest/xlsx-latest.tgz
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```
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2) Save the following to `bun.mjs`:
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```js title="bun.mjs"
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/* Load SQLite3 connector library */
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import { Database } from "bun:sqlite";
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/* Load SheetJS library */
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import * as XLSX from 'xlsx/xlsx.mjs';
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import * as fs from 'fs';
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XLSX.set_fs(fs);
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/* Initialize database */
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var db = Database.open("Northwind_large.sqlite");
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/* Create new workbook */
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var wb = XLSX.utils.book_new();
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/* Get list of table names */
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var sql = db.prepare("SELECT name FROM sqlite_master WHERE type='table'");
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var result = sql.all();
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/* Loop across each name */
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result.forEach(function(row) {
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/* Get first 100K rows */
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var aoo = db.prepare("SELECT * FROM '" + row.name + "' LIMIT 100000").all();
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if(aoo.length > 0) {
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/* Create Worksheet from the row objects */
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var ws = XLSX.utils.json_to_sheet(aoo, {dense: true});
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/* Add to Workbook */
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XLSX.utils.book_append_sheet(wb, ws, row.name);
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}
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});
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/* Write File */
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XLSX.writeFile(wb, "bun.xlsx");
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```
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3) Run `bun bun.mjs` and open `bun.xlsx`
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</TabItem>
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</Tabs>
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