使用Bluebird手动实现pg.connect

使用Bluebird手动实现pg.connect

丢掉所有可怕的回调代码，然后在应用程序初始化的某个位置执行此 *** 作：

var pg = require("pg");var Promise = require("bluebird");Object.keys(pg).forEach(function(key) {    var Class = pg[key];    if (typeof Class === "function") {        Promise.promisifyAll(Class.prototype);        Promise.promisifyAll(Class);    }})Promise.promisifyAll(pg);

以后在任何地方都可以使用pg模块，就好像它被设计为使用promises开头：

// Later// Don't even need to require bluebird herevar pg = require("pg");// Note how it's the pg API but with *Async suffixpg.connectAsync(...).spread(function(connection, release) {     return connection.queryAsync("...")         .then(function(result) { console.log("rows", result.rows);         })         .finally(function() { // Creating a superfluous anonymous function cos I am // unsure of your JS skill level release();         });});