使用objectid无法从Node.js中的MongoDB中检索数据

时间:2018-03-26 10:22:19

标签: javascript node.js mongodb express mongodb-query

当我从Postman的1家医院objectid到此计划时,它只返回empty array。但是one data匹配objectid。你能帮帮我解决这个问题吗?当我尝试在控制台中调试程序时,我看到了array is empty

doctor.js:

var express = require('express');
var router = express.Router();
var app=express()
var bodyParser = require("body-parser");
var validator = require('validator');
var mongo= require('./mongoconnect')
var authentication=require('./check_authentication')
var validate = require('./validation')
var ObjectId=require('mongodb').ObjectId

app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));

router.post('/',function(req,res)
{
    if(validate.name(req.body.name) && validate.length(req.body.name) && validate.empty(req.body.name))
    {
        if(validate.empty(req.body.hospital_id))
        {
            mongo.find("hospital","_id",ObjectId(req.body.hospital_id),function(result1)
            {
                if(result1.length==1)
                {
                    res.send("succcess")
                }
            })
        }
    }
})

module.exports = router;

MongoDB的集合是:

医院:

{ 
    "_id" : ObjectId("5aa92df0ec6b3cc78ff88afd"), 
    "name" : "apollo_hospitals"
}
{ 
    "_id" : ObjectId("5aa92df9ec6b3cc78ff88afe"), 
    "name" : "fortis"
}

mongoconnect.js:

var MongoClient = require('mongodb').MongoClient;
var url = "mongodb://localhost:27017/";
var dbo=null;
exports.connection=function()
{
    if(dbo!=null) return 

  MongoClient.connect(url, function(err, db)
    {
       if (err) throw err;
       dbo = db.db("hospital_api");
    });
}
var get = function (){
    return dbo;
}
exports.find=function(collections,key,value,callback)
{
    get().collection(collections).find({key:value}).toArray(function(err,result)
    {
        // console.log(collections)
        // console.log(key)
        // console.log(value)
        if(err) throw err;
        console.log(result)
        callback(result)
    })
}

1 个答案:

答案 0 :(得分:0)

在这里,我自己得到了解决方案。 我们必须使用ObjectID关键字声明New ..

Var some_variable = New ObjectID(_id)

之后,我们可以使用some_variable

在任何地方使用该ID