sheetjs/demos/database/SheetJSKnex.js

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/* xlsx.js (C) 2013-present SheetJS -- http://sheetjs.com */
/* eslint-env node */
var XLSX = require("xlsx");
async function book_append_knex(wb, knex, tbl) {
const aoo = await knex.select("*").from(tbl);
XLSX.utils.book_append_sheet(wb, XLSX.utils.json_to_sheet(aoo), tbl);
}
const TYPES = {
b: "boolean",
n: "float",
t: "string",
d: "dateTime"
};
async function ws_to_knex(ws, knex, n) {
if(!ws || !ws['!ref']) return;
var range = XLSX.utils.decode_range(ws['!ref']);
if(!range || !range.s || !range.e || range.s > range.e) return;
var R = range.s.r, C = range.s.c;
var names = new Array(range.e.c-range.s.c+1);
for(C = range.s.c; C<= range.e.c; ++C){
var addr = XLSX.utils.encode_cell({c:C,r:R});
names[C-range.s.c] = ws[addr] ? ws[addr].v : XLSX.utils.encode_col(C);
}
for(var i = 0; i < names.length; ++i) if(names.indexOf(names[i]) < i)
for(var j = 0; j < names.length; ++j) {
var _name = names[i] + "_" + (j+1);
if(names.indexOf(_name) > -1) continue;
names[i] = _name;
}
var types = new Array(range.e.c-range.s.c+1);
for(C = range.s.c; C<= range.e.c; ++C) {
var seen = {}, _type = "";
for(R = range.s.r+1; R<= range.e.r; ++R)
seen[(ws[XLSX.utils.encode_cell({c:C,r:R})]||{t:"z"}).t] = true;
if(seen.s || seen.str) _type = TYPES.t;
else if(seen.n + seen.b + seen.d + seen.e > 1) _type = TYPES.t;
else switch(true) {
case seen.b: _type = TYPES.b; break;
case seen.n: _type = TYPES.n; break;
case seen.e: _type = TYPES.t; break;
case seen.d: _type = TYPES.d; break;
}
types[C-range.s.c] = _type || TYPES.t;
}
await knex.schema.dropTableIfExists(n);
await knex.schema.createTable(n, (table) => { names.forEach((n, i) => { table[types[i] || "text"](n); }); });
for(R = range.s.r+1; R<= range.e.r; ++R) {
var row = {};
for(C = range.s.c; C<= range.e.c; ++C) {
var cell = ws[XLSX.utils.encode_cell({c:C,r:R})];
if(!cell) continue;
var key = names[C-range.s.c], val = cell.v;
if(types[C-range.s.c] == TYPES.n) if(cell.t == 'b' || typeof val == 'boolean' ) val = +val;
row[key] = val;
}
await knex.insert(row).into(n);;
}
}
async function wb_to_knex(wb, knex) {
for(var i = 0; i < wb.SheetNames.length; ++i) {
var n = wb.SheetNames[i];
var ws = wb.Sheets[n];
await ws_to_knex(ws, knex, n);
}
}
module.exports = {
book_append_knex,
wb_to_knex
};