Question

我是节点js的新手。我有一个部分，我应该得到他们的球队所有球员。

这是代码

var mysql = require("mysql");
var thenJade = require('then-jade');
var connection = mysql.createConnection({
    host: 'localhost',
    user: 'root',
    password: '',
    database: 'nodejs'
});

exports.players_list = function(req, res) {

    var data = {title: "", res: {}};
        if (authenticate(req, res)) {

            results_aaa(function(result) {
                console.log(result);
                res.render('players/players', {title: 'Players List', res: result});
           });

        } else {
            req.session.error = 'Please login to continue.';
            res.redirect('/login');
        }
};

function results_aaa(callback) {
    teams(function(res) {
        callback(res)
    });
}

function teams(callback) {
    var response = [];
    var query = connection.query("select * from team", function(err, result, fields) {
        for (var index in result)
        {
            players(result[index].id, function(results) {
                callback(result);
            });

        }
    });
}

function players(id, callback) {
    query("SELECT * FROM players where team = " + id, function(results) {
        callback(results);
    });
}

function query(sql, callback) {
    connection.query(sql, function(error, results, fields) {
        callback(results);
    });
}

但我只从一支球队中获得球员。由于节点js是异步的，它返回一个团队玩家并加载视图。

这是上述代码的控制台输出。

Express server listening on port 8081
[ { id: 2, player_name: 'Virat Kohli', team: '1' },
  { id: 4, player_name: 'A B DeVilliers', team: '1' },
  { id: 6, player_name: 'Chris Gayle', team: '1' } ]
GET /players 200 89ms - 638
[ { id: 7, player_name: 'Ajinkya Rahane', team: '2' },
  { id: 8, player_name: 'Shane Watson', team: '2' },
  { id: 9, player_name: 'Stuart Binny', team: '2' },
  { id: 10, player_name: 'Karun Nair', team: '2' },
  { id: 11, player_name: 'Sanju Samson', team: '2' } ]
[ { id: 1, player_name: 'Virender Sehwag', team: '3' },
  { id: 3, player_name: 'David Miller', team: '3' },
  { id: 5, player_name: 'Shaun Marsh', team: '3' } ]
GET /css/bootstrap.min.css 304 22ms
GET /css/style.css 304 6ms
GET /js/bootstrap.js 304 4ms
GET /js/bootstrap.min.js 304 4ms
GET /css/bootstrap.css 200 32ms - 129.44kb

我来到这里，请帮助。

提前致谢。

Answer 1

我认为问题出在＆＃39;团队＆＃39;功能。回调（结果）是在＆＃39; for＆＃39;内部调用的。环。基本上，您在每次迭代时渲染页面。尝试放置回调（结果）;在循环之外并将每个团队添加到响应中。

function teams(callback) {
var response = [];
var query = connection.query("select * from team", function(err, result, fields) {
    for (var index in result)
    {
        players(result[index].id, function(results) {
            callback(result);
        });

    }
});
}

从节点js中的mysql获取数据不能按预期工作

1 个答案: