Question

我想在mongodb中使用node.js从集合中找到结果。我的代码如下

var MongoClient = require('mongodb').MongoClient;
var assert = require('assert');
MongoClient.connect(url, function(err, db) {
    assert.equal(null, err);
    console.log("Mongo db Connected correctly to server.");
    db.close();
})

MongoClient.connect(url, function(err, db){
   collection.findOne({_id:req.body.Id},function(err, docs) {
         console.log("Printing docs from Array. count " + JSON.stringify(docs)); 
   });
});

我无法获得所需的结果。未定义获取错误集合。

Answer 1

尝试将id转换为ObjectId：

var MongoClient = require('mongodb').MongoClient;
var ObjectID = require('mongodb').ObjectID;
var assert = require('assert');
MongoClient.connect(url, function(err, db) {
    assert.equal(null, err);
    console.log("Mongo db Connected correctly to server.");
    db.close();
})

MongoClient.connect(url, function(err, db){
   db.collection('collectionName').findOne({_id:new ObjectID(req.body.Id)},function(err, docs) {
         console.log("Printing docs from Array. count " + JSON.stringify(docs)); 
   });
});

Answer 2

您需要定义要查询的集合：

db.collection('CollectionName').findOne({_id: req.body.Id}, function(err, docs) {
    console.log("Printing docs from Array. count " + JSON.stringify(docs)); 
    db.close();
});

Node.js MongoDB Driver API - findOne

使用node.js在mongo db中查找基于id的结果

2 个答案: