如何在node.js中从mongodb获取用户信息 [英] How to get user info from mongodb in node.js

问题描述

对于mongo来说，这完全是陌生的，我已经检查了几个小时的示例，试图检查该集合中是否存在用户:

Totally new to mongo, I've been checking examples for hours, Trying to check if a user exists in this collection:

{ "name" : "chrispy", "pass" : "xxxx", "_id" : ObjectId("5221b29b69f9e9b11a000001") }

但是不能匹配名称并获得结果，我已经尝试了很多例子，也没有运气.

But cannot match name and get the results, i've tried numerous examples, and no luck.

在控制台中运行良好:

mongo main
> db.users.findOne({name : 'chrispy'})
{
        "name" : "chrispy",
        "pass" : "xxxx",
        "_id" : ObjectId("5221b29b69f9e9b11a000001")
}
>

一旦我可以匹配名称，我将匹配密码.但甚至无法达到与用户名匹配的程度.帮助= 1000谢谢！

Once I can match the name, I'll match the password. but cant even get as far as matching the user name. Help = 1000 thankyou's!

var name = 'chrispy';
var pass = '';

console.log("About to check for name and pw");

Mongo.connect('mongodb://127.0.0.1:27017/main', function(err, db) {
    if(err) throw err;
    var collection = db.collection('users');

    // does user exist
    var doc = collection.findOne({name : name}, function(err,doc){
        if(err) throw err;
        if(doc)
            console.log("1 Found: "+name+", pass="+doc.pass);
        else
            console.log("1 Not found: "+name);

    });
    if(doc)
            console.log("2 Found: "+name+", pass="+doc.pass);
        else
            console.log("2 Not found: "+name);
    db.close();
});

控制台输出:

About to check for name and pw
2 Not found: chrispy

它似乎并没有进入findOne()函数，但在findOn()函数外部，它还是会失败.

It doesn't even seem to be going in to the findOne() function, external to the findOn() function it fails anyway.

推荐答案

所以这是开始工作之前所做的更改，删除了var Doc =，并仅在触发findOne()中的函数之后关闭了db，否则它将关闭结果之前的数据库.

So here are the changes before it started to work, removed var Doc = , and closed the db only after function within findOne() is fired, else it closes the DB before the result.

var name = 'chrispy';
var pass = '';

console.log("About to check for name and pw");
Mongo.connect('mongodb://127.0.0.1:27017/main', function(err, db) {
if(err) throw err;
var collection = db.collection('users');

// does user exist
collection.findOne({name : name}, function(err,doc){
    if(err) throw err;
    if(doc)
        console.log("Found: "+name+", pass="+doc.pass);
    else
        console.log("Not found: "+name);
    db.close();
});

});

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