node.js的generic-pool与mysql结合，mysql连接池

var generic_pool = require('generic-pool');var pool = generic_pool.Pool({    name: 'mysql',    max: 10,    create: function(callback) {        var Client = require('mysql').createConnection({            host:'127.0.0.1',            user:'root',            password:'123456',            database: 'weibo_gs'        });        callback(null,Client);    },    destroy: function(db) {        db.disconnect();    }});pool.acquire(function(err, client) {    if (err) {        // handle error - this is generally the err from your        // factory.create function      }    else {        client.query("select * from gs_scrapy", [], function(err,data) {            console.log(data);            // return object back to pool            pool.release(client);        });    }});