I am trying to fetch data from couch and i follwed the code below
var request = require('request')
var nano = require('nano')('http://localhost:5984/user');
var url = 'http://127.77.3.1:5984/'
var db = 'users2/'
var id = 'document_id'
exports.insertdata = function (req, res) {
var data = req.body;
var item = {
name: data.name,
skills: data.skills,
experience: data.experience
};
nano.insert(item,(err, result) => {
if(!err){
//awesome
}if(result){
console.log(result)
response = {status:'success',data:result};
}
res.send(response);
});
};
exports.getdata = function (req, res) {
nano.getDoc('25f2b6d1e5b83887a42c74bc9b000647',(err, result) => {
if(!err){
//awesome
console.log(err)
}if(result){console.log(result)
console.log('inserted')
response = {status:'success',data:result};
}
res.send(response);
});
};
I am getting the following error
nano.getDoc is not a function
I am trying to fetch data from couch and i follwed the above code,i am not sure about the commands ....can anyone please suggest me some help..........
There is no getDoc in nano as far as I know. There is get. Maybe try changing this:
nano.getDoc('25f2b6d1e5b83887a42c74bc9b000647', (err, result) => {
});
to:
nano.get('25f2b6d1e5b83887a42c74bc9b000647', (err, result) => {
});
and see if that works.
For example here is a simplest query to the CouchDB database that powers the npm registry:
var nano = require('nano');
var db = nano('https://skimdb.npmjs.com/registry');
db.get('rsp', (err, data) => {
if (err) {
console.log(err);
} else {
console.log(data);
}
});
Here rsp is the document id, which is a module's name on npm.
In your case it might work if you change getDoc to get. For other function names see the documentation at:
https://www.npmjs.com/package/nano
Related
I start to develop a simple web application with NodeJS. and when I try to get a list record from SQL Server to show on the list page but somehow it's not working.
Here is the code :
const express = require("express");
const bodyParser = require("body-parser");
const sql = require("mssql");
const DBUtils = require("./DBUtils");
const app = express();
app.get("/all", (req, res, next) => {
let mypromise = new Promise((reso, rej) => {
let nameList = DBUtils.getNameList(sql);
if (nameList !== null || typeof nameList !== "undefined") {
reso(nameList);
} else {
rej("Error");
}
})
.then((result) => {
res.send(result);
})
.catch((err) => {
console.log(err);
});
});
app.get("/", (req, res, next) => {
console.log("the / route");
res.send("<h1>Hello to NodeJS</h1>");
});
app.listen(5003);
My DBUtils
const config = {
user: "sa",
password: "123",
server: "DESKTOP-7KGJI7L", // You can use 'localhost\\instance' to connect to named instance
database: "java",
options: {
encrypt: false,
},
};
const getNameList = (sql) => {
let nameList = "";
let errorString = "";
// Create connection
sql.connect(config, function (err) {
// Err
if (err) {
console.log(err);
}
// Create Request object
let sqlRequest = new sql.Request();
// QueryString
let queryString = `select * from NAME`;
// Run the query
sqlRequest.query(queryString, (err, data) => {
if (err) console.log(err);
//console.log(data); //data.recordset(array)[index].name
data.recordset.forEach((el) => {
nameList += `<li>${el.name}</li>`;
});
return nameList;
});
});
};
exports.getNameList = getNameList;
I pretty sure something wrong in Promise line but don't know how to fix it. Any suggest?
I think you are a newbie in Nodejs You made a common mistake. You did not use promise pattern correctly. Also, no need to pass next callback unless required.
Change getNameList as below :
const getNameList = (sql) => {
let nameList = "";
let errorString = "";
// Create connection
return new Promise (function(resolve,reject) {
sql.connect(config, function (err) {
// Err
if (err) {
console.log(err);
reject(err)
}
// Create Request object
let sqlRequest = new sql.Request();
// QueryString
let queryString = `select * from NAME`;
// Run the query
sqlRequest.query(queryString, (err, data) => {
if (err) {console.log(err)
reject(err)
}
//console.log(data); //data.recordset(array)[index].name
data.recordset.forEach((el) => {
nameList += `<li>${el.name}</li>`;
});
resolve(nameList);
});
});
})
};
Change app.get("/all") as below:
app.get("/all", (req, res) => {
DBUtils.getNameList(sql).then(function(list) {
res.status(200).send(list)
}).catch(function(err) { //handle error here
res.status(500)
})
})
Moreover, learn how to use promises and async-await.
Use appropriate body-parser as per requirement ie json, text etc.
Learn how and when to use next
I was recently using a function to upload files to a mongodb database successfully. However after moving those functions into a file (to clean up) and exporting that file then requiring it in my route, the database now creates documents with only null values like so:
_id:ObjectId("xxxxxxxxxxxxxxx")
name:null,
value:null,
image:null,
desc:null
I don't know what might be causing this, I am logging the argument object that i'm trying to insert from inside the function 'insertProducts' and the item.name is not null. Sorry I'm new to mongodb :/
maybe someone can point me in the right direction?
CRUD.js
const mongodb = require('mongodb');
const MongoClient = mongodb.MongoClient;
const removeProducts = function(req,res){
MongoClient.connect('mongodb://localhost', (err, client) => {
if (err) {
throw err;
}
let db = client.db('account-app');
let products = db.collection('products');
let users = db.collection('users');
try{
products.remove({ _id: req.body.id }, function(err) {
if (!err) {
console.log('removed item')
}
});
}
catch(err){
console.log('Error while inserting', err)
}
client.close()
res.redirect('/addItems')
})
}
const insertProducts = function(item,res){
console.log("item name",item.name)
MongoClient.connect('mongodb://localhost', (err, client) => {
if (err) {
throw err;
}
let db = client.db('account-app');
let products = db.collection('products');
try{
products.insertOne(item)
console.log('item inserted')
}
catch(err){
console.log('Error while inserting', err)
}
client.close()
res.redirect('/admin/addItems')
})
}
module.exports={removeProducts: removeProducts, insertProducts: insertProducts}
my admin route that requires the crud functions
const crudOps = require('../utils/admin/CRUD') //require CRUD functions
// Adding new items
// --------------------------------------------------
router.post('/addNewItems', (req, res, next) => {
console.log(req.body.name)
let item = {
name:req.body.name,
file: binary(req.files.image.data),
value: req.body.value,
desc: req.body.desc
}
crudOps.insertProducts(item, res)
});
That connection URL looks wrong. Generally, it has the format:
mongodb://localhost:27017/mydatabase
Try replacing the connection string with the appropriate one for your database and see if that works. Also, the docs normally have insertOne statements like this so maybe that is the issue?
products.insertOne(item, function(err, r) {
console.log('item inserted')
res.redirect('/admin/addItems')
db.close();
});
I'm writing a code that uses a library(jsforce) to query on Salesforce and get the records.
Currently, to keep the code clean, I'm separating the index and rest calls file. Here is my code.
var jsforce = require('jsforce');
const uName = 'myId';
const pwd = 'myPwd';
const servKey = 'myKey';
var conn = new jsforce.Connection();
var login = conn.login(uName, pwd, servKey, function (err, res) {
if (err) { return false; }
return true;
});
module.exports = {
myCases: () => {
console.log(`I'm called`);
login.then(() => conn.query(`Select ID, Subject from Case where status='new'`, function (err, openCases) {
if (err) { return console.error(err); }
return openCases;
}));
}
}
and my index file is as below.
const restServices = require('./restServices');
var test = function () {
restServices.myCases((err, data, response) => {
console.log('err')
console.log(err)
console.log('data');
console.log(data);
console.log('response');
console.log(response);
});
}
test();
When I run it, my log prints only I'm called (from restServices.js). but none of the data from my index.js is printed.
also when I add a console.log(openCases), it prints exactly the required data.
please let me know on where am I going wrong in returning the data and how can I fix this.
Thanks
To mycase pass an callback
Example in service.js
Mycase(callback) =>{
// response, err from db then
Callback(err, response)
}
In index.js
Service.mycase((err, response) =>{
Console.log (err, response)
}
I'm new to Node.js and am trying to pass some data from my DB model back to the router but I'm unable to find a solution. I have the following route file that makes a call to model:
Route file:
var express = require('express');
var router = express.Router();
var db = require('../db');
var customers = require('../models/customers');
db.connect(function(err) {
if (err) {
console.log('Unable to connect to MySQL.')
process.exit(1)
}
});
router.post('/', function(req, res) {
customers.checkPassword(req.body.cust_id, req.body.password);
res.sendStatus(200);
});
Model file:
var db = require('../db.js');
module.exports.checkPassword = function(cust_id, password) {
var sql = "SELECT Password FROM Shop.customers WHERE ID =" + cust_id;
db.get().query(sql, function (err, res, fields) {
result = res[0].Password;
if (err) throw err
});
};
My question is: how could I pass the queried result Password back to my Route file so that I can do this:
console.log('Password is', result);
I appreciate any help on this.
I'd use a promise
Model file
module.exports.checkPassword = function(cust_id, password) {
return new Promise(function(resolve, reject) {
const sql = "SELECT Password FROM Shop.customers WHERE ID =" + cust_id;
db.get().query(sql, function (err, res, fields) {
if (err) return reject(err)
result = res[0].Password;
return resolve(result);
});
});
};
Route file
var express = require('express');
var router = express.Router();
var db = require('../db');
var customers = require('../models/customers');
db.connect(function(err) {
if (err) {
console.log('Unable to connect to MySQL.')
process.exit(1)
}
});
router.post('/', function(req, res) {
customers.checkPassword(req.body.cust_id, req.body.password)
.then((result) => {
// DO: something with result
res.status(200).send();
})
.catch(console.log); // TODO: Handle errors
});
With async/await
router.post('/', async function(req, res) {
try {
const result = await customers.checkPassword(req.body.cust_id, req.body.password)
// DO: something with the result
} catch (e) {
console.log(e); // TODO: handle errors
} finally {
res.status(200).send();
}
});
I assume console.log('Password is', result); is just for test prupose, obviously you should never log a password! Also I suggest to move the callbabck of the routes do a different module, to improve code redability.
You might also find useful promise-module module on npm, basically a promise wrapper around mysql.
You can delegate the credential control to another function in your DB file where you can decide on what kind of data you want to return on success and failure to find such data. Then you can access it from where you are calling it.
I'm using the Express framework for my node application. I'm quite new to it so I thought I'd create a defacto "To-Do" application to learn about it. What I'm trying to do it log a request made for debugging purposes. So when I go to:
app.get('/todos/:id', function (req, res) {
var result = db.load(req.params.id);
result ? res.send(result) : res.send(404);
});
I want to a) see what result equals and b) log what happens in my db.load method:
exports.load = function (id) {
todos.findOne({ id: id }, function (err, todo) {
if (!err) {
return todo;
}
});
}
I'm using the mongolian library to access my MongoDB data. I've followed an example by Steve Sanderson: https://github.com/SteveSanderson/nodejs-webmatrix-video-tutorials
app.get('/todos/:id', function (req, res) {
db.load(req.params.id, function(err, result) {
// also handle err
result ? res.send(result) : res.send(404);
});
});
exports.load = function (id, callback) {
todos.findOne({ id: id }, callback);
}