Create databases connection on startup - sails.js - mysql

Question

I know you can use Waterline and the models approach, but the issue is that I have to access more than one database to generate a response. Besides the models approach makes it difficult to think on a solution due to the fact that the data is joined and infered from different tables under the different databases.
Therefore, I would like to know how can I open a DB connection using the mysql or mysql2 native driver and reuse it all over the app. Where is the most suitable place, a hook, etc.? How can I close them when the app goes down?
TA

Answer 1

A custom hook will be the best for you. For Redis, I created one like this:
api/hooks/redis/index.js
var redisModule = require('redis');
module.exports = function connectToRedis(sails) {
return {
connectToRedis: function (callback) {
var hook = this;
var config = sails.config.connections.redis;
var redisClient = redisModule.createClient(config.port, config.host);
hook.initAdapters();
redisClient.on('connect', function () {
sails.log.verbose('Connection to redis was succesfull!');
// select db
redisClient.select(config.db, function (err) {
if (err) {
return callback(err);
}
sails.adapters.redis = redisClient;
callback();
});
});
redisClient.on('error', function (error) {
sails.log.error(error);
callback();
});
},
initAdapters: function () {
if (sails.adapters === undefined) {
sails.adapters = {};
}
},
// Run automatically when the hook initializes
initialize: function (cb) {
var hook = this;
hook.connectToRedis(function() {
cb();
});
},
};
};