docs.sheetjs.com/docz/static/sqlite/SheetJSQLiteDeno.ts

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2023-05-29 02:52:54 +00:00
/* Load SQLite3 connector library */
import { DB } from "https://deno.land/x/sqlite/mod.ts";
/* Load SheetJS library */
// @deno-types="https://cdn.sheetjs.com/xlsx-latest/package/types/index.d.ts"
import * as XLSX from "https://cdn.sheetjs.com/xlsx-latest/package/xlsx.mjs";
/* Initialize database */
var db = new DB("chinook.db");
/* Create new workbook */
var wb = XLSX.utils.book_new();
/* Get list of table names */
var sql = db.prepareQuery("SELECT name FROM sqlite_master WHERE type='table'");
var result = sql.all();
/* Loop across each name */
result.forEach(function(row) {
/* Get first 100K rows */
var query = db.prepareQuery("SELECT * FROM '" + row[0] + "' LIMIT 100000")
var aoa = query.all();
if(aoa.length > 0) {
/* Create array of arrays */
var data = [query.columns().map(x => x.name)].concat(aoa);
/* Create Worksheet from the aoa */
var ws = XLSX.utils.aoa_to_sheet(data, {dense: true});
/* Add to Workbook */
XLSX.utils.book_append_sheet(wb, ws, row[0]);
}
});
/* Write File */
XLSX.writeFile(wb, "SheetJSQLiteDeno.xlsx");