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我用express和webpack做了我的服务,它在开始时运行良好。奇怪的是,一段时间后服务(服务器)将挂起。屏幕截图显示时,没有收到消息代码。 (server message screenshot) 而这种情况一再发生。NodeJS/express:服务器启动后暂停运行一段时间
我app.js
var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
var index = require('./routes/index');
var users = require('./routes/users');
var app = express();
var mysql = require('mysql');
var generals = require('./routes/generals');
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use('/generals', generals);
app.use(express.static(path.join(__dirname, 'public')));
app.use('/', index);
app.use('/users', users);
// catch 404 and forward to error handler
app.use(function(req, res, next) {
var err = new Error('Not Found');
err.status = 404;
next(err);
});
// error handler
app.use(function(err, req, res, next) {
// set locals, only providing error in development
res.locals.message = err.message;
res.locals.error = req.app.get('env') === 'development' ? err : {};
// render the error page
res.status(err.status || 500);
res.render('error');
});
module.exports = app;
在这里是路线文件:generals.js
var express = require('express');
var bodyParser = require('body-parser');
var router = express.Router();
var pool = require('./connections');
router.get('/dropDownValue/', function(req, res, next) {
pool.getConnection(function(err, connection) {
connection.query("select * from drop_down_value order by id desc", function(err, rows) {
if (!err && rows.length > 0) {
res.json(rows);
} else {
res.json([]);
}
});
});
});
var mysql = require('mysql');
var pool = mysql.createPool({
host: 'xxx',
user: 'xxx',
password: 'xxx',
database: 'xxx'
});
exports.getConnection = function (callback) {
pool.getConnection(callback);
};
在代码中添加对未处理拒绝(对于承诺)和未捕获异常(对于try catch)的支持,并告诉我们是否在服务器挂起时在日志中看到新的东西 – Fefux
304不是问题(它是Express你的浏览器,即文件的缓存版本仍然是最新的),这是对'/ generals/dropDownValue'的请求开始失败。我们不知道为什么,因为你没有显示它的代码。而且,“池”不是全球性的,与评论所述相反。 – robertklep
@robertklep我更新了代码并删除了全局池。 – Christine