我是一名新手,正在学习Node.js和Express。
我该如何在"routes/index.js"中访问"app.js"中创建的变量"pg"?
app.js
/**
* Module dependencies.
*/
var express = require('express');
var routes = require('./routes');
var user = require('./routes/user');
var http = require('http');
var path = require('path');
var pg = require('pg');
var conString = "postgres://someuser:somepass@localhost/postgres"
var app = express();
// all environments
app.set('port', process.env.PORT || 3000);
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');
app.use(express.favicon());
app.use(express.logger('dev'));
app.use(express.json());
app.use(express.urlencoded());
app.use(express.methodOverride());
app.use(app.router);
app.use(express.static(path.join(__dirname, 'public')));
routes/index.js
/*
* GET home page.
*/
exports.index = function(req, res){
var client = new pg.Client(conString);
client.connect(function(err) {
if(err) {
return console.error('could not connect to postgres', err);
}
client.query('SELECT NOW() AS "theTime"', function(err, result) {
if(err) {
return console.error('error running query', err);
}
console.log(result.rows[0].theTime);
//output: Tue Jan 15 2013 19:12:47 GMT-600 (CST)
client.end();
});
});
我在浏览器中遇到了错误:
Express 500 ReferenceError: pg is not defined
你们能给我一些线索吗?
最好的问候
require('pg')
不会带来太大成本。 - Lawrence Jones