nodejs get sqlite3 query result using promise or wait - node.js

Question

This is my first personal project in Nodejs. I'm trying to get in live soon.
I have a Nodejs server that uses sqlite3. There are only 3000 rows with word, transform and a precalculated value each in a column of the table, which is already populated.
I need to just lookup the word in the DB to be sure it is valid.
var sqlite3 = require("sqlite3").verbose();
var db = new sqlite3.Database("validate.db");
db.get("SELECT * FROM tab WHERE w = ?", word, function(err, row) {
if(err) { console.log("Lookup:",word,", Error => ",err); return false; }
return true;
});
The problem is that the caller of this code has a lot of context and need the operation to wait. So, I tried this
function dbLookup(db, w) {
return function(cb) {
var rows = [];
db.exec('SELECT w FROM tab WHERE w = "'+w+'"')
.on('row', function(r) {
rows.push(r)
})
.on('result', function() {
cb(rows);
});
}
async.each([word], function(w) {
dbLookup(this.db, w);
}, function(err) {
if(err) {console.log("...ERROR..."); return false; }
else {console.log("...SUCCESS..."); return true; }
});
This doesn't solve the wait issue as the callback can fire at its own pace.
I read that promise using something like bluebird can solve my problem
but now I'm not able to get the value/result of the query out:
I've been pulling my hair for so long. Please help me either get the async working or get the result back from the promise approach.

Answer 1

var async = require('async');
var sqlite3 = require("sqlite3").verbose();
var db = new sqlite3.Database("validate.db");
function check(word, callback) {
db.get("SELECT count(1) cnt FROM tab WHERE w = ?", word, callback)
}
async.map(words, check, function(err, results) {
if (err)
return console.log('Query error')
var all_checked = results.filter(function(r) {
return r.cnt > 0
});
...
});
Or
var sqlite3 = require("sqlite3").verbose();
var db = new sqlite3.Database("validate.db");
db.all("SELECT distinct w FROM tab", function(err, rows) {
var all_checked = words.filter(function (w) {
return rows.indexOf(w) != -1;
})
...
})