I am using node-mysql module (https://github.com/felixge/node-mysql) OR (http://utahjs.com/2010/09/22/nodejs-and-mysql-introduction/) .
Is this API handling connection pooling as well?
I mean with every user request I am calling Client.connect()
to query the MySQL and to release the connection: Client.end()
.
Is this the right way, or should I connect/disconnect only once in a code.
I am learning from this document: https://github.com/felixge/node-mysql/blob/master/Readme.md
Update: Feb 2013 - pool support has been added to node-mysql, see docs
Example using built-in pool:
var pool = require('mysql').createPool(opts);
pool.getConnection(function(err, conn) {
conn.query('select 1+1', function(err, res) {
conn.release();
});
});
Pre 2013 solutions:
You can use node-pool or mysql-pool or use your own simple round-robin pool
function Pool(num_conns)
{
this.pool = [];
for(var i=0; i < num_conns; ++i)
this.pool.push(createConnection()); // your new Client + auth
this.last = 0;
}
Pool.prototype.get = function()
{
var cli = this.pool[this.last];
this.last++;
if (this.last == this.pool.length) // cyclic increment
this.last = 0;
return cli;
}
now you can hope to have all queries callbacks to execute in 1 second:
var p = new Pool(16);
for (var i=0; i < 10; ++i)
{
p.get().query('select sleep(1)', function() { console.log('ready'); } ); // server blocks for 1 second
}