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Proyecto audio control. inicado con panel y control.

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express-myconnection
============
Connect/Express middleware provides a consistent API for MySQL connections during request/response life cycle. It supports three different strategies of managing db connections: ` single ` for a singleton connection on an app instance level, `pool` based connections, and a new connection per each `request`. It’s also capable of auto closing/releasing connections if configured either with `pool` or `request`. It uses [node-mysql](https://github.com/felixge/node-mysql) as a MySQL driver.
### Strategies
* `single` - creates single database connection for an application instance. Connection is never closed. In case of disconnection it will try to reconnect again as described in [node-mysql docs](https://github.com/felixge/node-mysql).
* `pool` - creates pool of connections on an app instance level, and serves a single connection from pool per request. The connections is auto released to the pool at the response end.
* `request` - creates new connection per each request, and automatically closes it at the response end.
### Usage
Configuration is straightforward and you use it as any other middleware. First param it accepts is a [node-mysql](https://github.com/felixge/node-mysql) module, second is a db options hash passed to [node-mysql](https://github.com/felixge/node-mysql) module when connection or pool are created. The third is string defining strategy type.
// app.js
...
var mysql = require('mysql'), // node-mysql module
myConnection = require('express-myconnection'), // express-myconnection module
dbOptions = {
host: 'localhost',
user: 'dbuser',
password: 'password',
port: 3306,
database: 'mydb'
};
app.use(myConnection(mysql, dbOptions, 'single');
...
**express-myconnection** extends `request` object with `getConection(callback)` function, this way connection instance can be accessed anywhere in routers during request/response life cycle:
// myroute.js
...
module.exports = function(req, res, next) {
...
req.getConnection(function(err, connection) {
if (err) return next(err);
connection.query('SELECT 1 AS RESULT', [], function(err, results) {
if (err) return next(err);
results[0].RESULT;
// -> 1
res.send(200);
});
});
...
}
...

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/**
* Module dependencies.
*/
var express = require('express');
var routes = require('./routes');
var http = require('http');
var path = require('path');
var mysql = require('mysql'),
myConnection = require('express-myconnection');
var app = express();
// all environments
app.set('port', process.env.PORT || 3000);
app.set('views', __dirname + '/views');
app.set('view engine', 'ejs');
app.use(express.logger('dev'));
// It has to be registered somewhere before app.router
app.use(myConnection(mysql, {
host: process.env.DB_HOST,
user: process.env.DB_USER,
password: process.env.DB_PASSWORD,
port: process.env.DB_PORT,
database: process.env.DB_DATABASE
}, 'single'));
app.use(app.router);
app.get('/', routes.index);
http.createServer(app).listen(app.get('port'), function () {
console.log('Express server listening on port ' + app.get('port'));
});

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{
"name": "application-name",
"version": "0.0.1",
"private": true,
"scripts": {
"start": "node app.js"
},
"dependencies": {
"express": "~3.4.0",
"ejs": "~0.8.4",
"mysql": "~2.0.0-alpha9",
"express-myconnection": "~1.0.2"
}
}

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/*
* GET home page.
*/
exports.index = function (req, res, next) {
req.getConnection(function (err, connection) {
connection.query('SELECT ? AS RESULT', ['Hello World!'], function (err, results) {
if (err) return next(err);
res.render('index', {
title: 'express-myconnection',
result: results[0].RESULT
});
});
});
};

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<!DOCTYPE html>
<html>
<head>
<title><%= title %></title>
<style>
body {
font-family: "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif;
}
</style>
</head>
<body>
<h1><%= title %></h1>
<p><%= result %></p>
</body>
</html>

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module.exports = require('./lib/express-myconnection.js');

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var _mysql,
_dbConfig,
_connection, // This is used as a singleton in a single connection strategy
_pool; // Pool singleton
/**
* Handling connection disconnects, as defined here: https://github.com/felixge/node-mysql
*/
function handleDisconnect() {
_connection = _mysql.createConnection(_dbConfig);
_connection.connect(function (err) {
if (err) {
console.log('error when connecting to db:', err);
setTimeout(handleDisconnect, 2000);
}
});
_connection.on('error', function (err) {
console.log('db error', err);
if (err.code === 'PROTOCOL_CONNECTION_LOST') {
handleDisconnect();
} else {
throw err;
}
});
}
/**
* Returns middleware that will handle mysql db connections
*
* @param {Object} mysql - mysql module
* @param {Object} dbConfig - object with mysql db options
* @param {String} or undefined strategy - default is single strategy
* @return {Function}
* @api public
*/
module.exports = function (mysql, dbConfig, strategy) {
if (null == mysql) throw new Error('Missing mysql module param!');
if (null == dbConfig) throw new Error('Missing dbConfig module param!');
if (null == strategy) strategy = 'single';
// Setting _mysql module ref
_mysql = mysql;
// Setting _dbConfig ref
_dbConfig = dbConfig;
// Configuring strategies
switch (strategy) {
case 'single':
// Creating single connection instance
_connection = _mysql.createConnection(dbConfig);
handleDisconnect(dbConfig);
break;
case 'pool':
// Creating pool instance
_pool = _mysql.createPool(dbConfig);
break;
case 'request':
// Nothing at this point do be done
break;
default:
throw new Error('Not supported connection strategy!');
}
return function (req, res, next) {
var poolConnection,
requestConnection;
switch (strategy) {
case 'single':
// getConnection will return singleton connection
req.getConnection = function (callback) {
callback(null, _connection);
}
break;
case 'pool':
// getConnection handled by mysql pool
req.getConnection = function (callback) {
// Returning cached connection from a pool, caching is on request level
if (poolConnection) return callback(null, poolConnection);
// Getting connection from a pool
_pool.getConnection(function (err, connection) {
if (err) return callback(err);
poolConnection = connection;
callback(null, poolConnection);
});
}
break;
case 'request':
// getConnection creates new connection per request
req.getConnection = function (callback) {
// Returning cached connection, caching is on request level
if (requestConnection) return callback(null, requestConnection);
// Creating new connection
var connection = _mysql.createConnection(dbConfig);
connection.connect(function (err) {
if (err) return callback(err);
requestConnection = connection;
callback(null, requestConnection);
});
}
break;
}
var end = res.end;
res.end = function (data, encoding) {
// Ending request connection if available
if (requestConnection) requestConnection.end();
// Releasing pool connection if available
if (poolConnection) poolConnection.release();
res.end = end;
res.end(data, encoding);
}
next();
}
}

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{
"name": "express-myconnection",
"version": "1.0.4",
"description": "Connect/Express middleware that auto provides mysql connections.",
"main": "index.js",
"directories": {
"example": "examples"
},
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1"
},
"repository": {
"type": "git",
"url": "https://github.com/pwalczyszyn/express-myconnection.git"
},
"homepage": "http://github.com/pwalczyszyn/express-myconnection",
"keywords": [
"express",
"mysql",
"connect",
"pool",
"middleware"
],
"author": "Piotr Walczyszyn",
"license": "MIT"
}