Node.js, Express.js and sqllite3.js - node.js

Question

I have a problem with object attributes in Node.js. While attributes are set as expected in the test object, the same doesn't work for my articles object. The difference I see is that the functions of articles are called asynchronously. I must confess that I am a bit lost...
Here is app.js, that instantiates the test object and the articles object.
/**
* Load express.
*/
var express = require('express');
var app = express();
/**
* Load articles.
*/
var articles = require('./article.js');
var l_articles = new articles.Articles();
var test = require('./test.js');
var l_test = new test.Test();
app.get('/', function (req, res) {
console.log(l_test.get());
l_test.set('it is', 'midnight');
console.log(l_test.get());
articles.Articles.get(1);
res.send('OK');
})
app.listen(3001, function () {
console.log(l_test.get());
l_test.set('goodbye', 'sunshine');
console.log(l_test.get());
})
Here is my fairly simple test.js :
var app = require('./app.js');
function Test() {
this.timestamp = new Date();
console.log(this.timestamp);
this.attribute1 = 'hello';
this.attribute2 = 'world';
}
Test.prototype.get = function() {
console.log(this.timestamp);
return (this.attribute1 + ' ' + this.attribute2);
}
Test.prototype.set = function(p_param1, p_param2) {
console.log(this.timestamp);
this.attribute1 = p_param1;
this.attribute2 = p_param2;
}
module.exports = {
Test: Test
};
Here is my fairly simple article.js :
var sqlite3 = require('sqlite3').verbose();
var app = require('./app.js');
function Articles(p_id) {
this.timestamp = new Date();
console.log(this.timestamp);
this.db = new sqlite3.Database('./gescom.sqlite');
if (p_id == undefined) {
this.db.all('SELECT * FROM T_ARTICLE', this.load);
} else {
this.db.all('SELECT * FROM T_ARTICLE WHERE id = ' & p_id, this.load);
}
}
Articles.prototype.load = function(p_err, p_rows) {
console.log(this.timestamp);
var ids = [];
var articles = [];
p_rows.forEach(function(p_row) {
ids.push(p_row.ID);
articles.push([p_row.ID, p_row.SHORT_NAME]);
});
this.ids = ids;
this.articles = articles;
console.log(this.ids.length + ' articles loaded from database.');
}
Articles.prototype.get = function (p_id) {
console.log(this.timestamp);
var l_return;
if ((this.ids == undefined) || (this.articles == undefined)) {
console.log('No articles loaded from database.');
} else {
console.log(this.ids.length + ' articles loaded from database.');
if (p_id == undefined) {
l_return = this.articles;
} else {
if (this.ids.indexOf(p_id) != undefined) {
l_return = (this.articles[this.ids.indexOf(p_id)]);
} else {
l_return = undefined;
}
}
}
return l_return;
}
module.exports = {
Articles: Articles
};