I'm using the npm module jdbc to try to connect to Cloudera Impala.
I have tried both the apache hive-jdbc-0.13.1-cdh5.3.3.jar for hiveserver2
as well as the Cloudera JDBC ImpalaJDBC41.jar
var jdbc = new (require('jdbc'));
var config = {
libpath: '/home/ubuntu/downloads/impala_jdbc/hive-jdbc-0.13.1-cdh5.3.3.jar',
libs:'/home/ubuntu/downloads/impala_jdbc/lib/*.jar',
drivername: 'org.apache.hive.jdbc.HiveDriver',
url: 'jdbc:hive2://54.172.122.6:21050/;auth=noSasl' + process.argv[2]
};
//Initialize jdbc object
jdbc.initialize(config, function(err, res){ if (err){ console.log(err); } });
jdbc.open(function(err, conn) {
if (conn) {
//Run first query
jdbc.executeQuery('show databases', function(err, results){
if (err){ console.log(err); }
else if (results) { console.log(results); }
});
}else{
console.log('Connection object:' + conn);
console.log(err);
}
});
jdbc.close(function(err){
if(err) { console.log(err); }
else { console.log('Connection closed successfully!');}
});
whenever I run it (after correcting for each driver path)
I get the following
/home/ubuntu/PlayArea/ImpalaJDBC/node_modules/jdbc/lib/jdbc.js:22
java.classpath.push.apply(java.classpath, self._config.libs);
^
TypeError: Function.prototype.apply: Arguments list has wrong type
at JDBCConn.initialize (/home/ubuntu/PlayArea/ImpalaJDBC/node_modules/jdbc/lib/jdbc.js:22:24)
at Object.<anonymous> (/home/ubuntu/PlayArea/ImpalaJDBC/server.js:12:6)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Function.Module.runMain (module.js:497:10)
at startup (node.js:119:16)
at node.js:935:3
I'm assuming that my libs path is not finding all the jars needed.
Related
I have a simple dc bot, code goes like this. I tried to simplfy it to make it more readable
const client = new Discord.Client();
...
client.on('ready', () => {
client.channels.cache.get('315445287374028800').send("works here");
});
setInterval(( () =>{
try{
removeHTML(downloadHTML);
} catch(err){
console.log(err);
}
}),30000);
...
...
let removeHTML = function(callback){
client.channels.cache.get('315445287374028800').send("WORKS HERE");
readHTML();
...
}
let readHTML = function(){
console.log("dolar is read");
//client.channels.cache.get('315445287374028800').send("DOESNT WORK HERE");
fs.readFile(dir + '/index.html' , 'utf-8', function(err,html){
if(err)
console.log(err);
else{
//client.channels.cache.get('315445287374028800').send("DOESNT WORK HERE");
if(isPeak){
//client.channels.cache.get('315445287374028800').send("DOESNT WORK HERE");
}
}
});
}
seems like send function doesnt work in callback functions but how can i fix this?
Error type: same error for all ("DOESNT WORK HERE") lines :
TypeError: Cannot read property 'send' of undefined
at readHTML (C:\Users\user\Desktop\Discord Bot\index.js:142:18)
at Object.<anonymous> (C:\Users\user\Desktop\Discord Bot\index.js:182:1)
at Module._compile (internal/modules/cjs/loader.js:1015:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1035:10)
at Module.load (internal/modules/cjs/loader.js:879:32)
at Function.Module._load (internal/modules/cjs/loader.js:724:14)
at Function.executeUserEntryPoint [as runMain]
I have turned all functions to async-await instead and it worked
Hi everyone I'm beginner in Nodejs and mongoose.I have tried to insert and retrieve the data in mongoose.I'm using async await function to execute one by one (sequence).can anyone help me? Thanks in advance....
i.e: I want to execute (Async await)concept (SEQUENCE STEP)
1.connect the db
2.create the user
3.find the user.
I'm getting the error :
async function calltaskone(){
^^^^^^^^
SyntaxError: Unexpected token function
at Object.exports.runInThisContext (vm.js:78:16)
at Module._compile (module.js:543:28)
at Object.Module._extensions..js (module.js:580:10)
at Module.load (module.js:488:32)
at tryModuleLoad (module.js:447:12)
at Function.Module._load (module.js:439:3)
at Module.runMain (module.js:605:10)
at run (bootstrap_node.js:420:7)
at startup (bootstrap_node.js:139:9)
at bootstrap_node.js:535:3
Code for your reference:
'use strict';
const mongoose=require('mongoose');
const calldbconnect=()=>{
return new Promise((resolve,reject)=>{
if(true){
mongoose.connect('mongodb://vdsd:vdwdwh12dw3,#ds11dwdw.mlab.com:1w5664/vorganisation',{useNewUrlParser:true},(err,db)=>{
if(err){
console.log(err);
reject('Db is not connected');
}
else{
resolve('Db is connected');
}
});
}
});
}
const schemadesign=new mongoose.Schema({
clientName:String,
clientId:Number,
clientAddress:String
});
const modeldata=mongoose.model('clientInfo',schemadesign);
const data=[{
clientName:'VIGNESH Mack',
clientId:4128,
clientAddress:'UK'
},{
clientName:'VIGNESH Tokyo',
clientId:4988,
clientAddress:'USA'
}];
function calldatasave(){
return new Promise((resolve,reject)=>{
modeldata.create(data,(err,a,b)=>{
if(err){
reject(`Error occured while data saved ${err}`);
}
else{
resolve('Data saved successfully');
}
});
});
}
const calldatafind=()=>{
return new Promise((resolve,reject)=>{
if(true){
console.log('try to find');
modeldata.find({'clientId':4988},(err,data)=>{
if(err){
reject(`Error occured while find data: ${err}`)
}
else{
console.log(data);
resolve('Data found');
}
});
}
});
}
async function calltaskone(){
const a=await calldbconnect();
console.log(a);
const b=await calldatasave();
console.log(b);
const c=await calldatafind();
console.log(c);
}
calltaskone();
I believe you're using a older version of Node. Async functions are not supported by Node versions older than version 7.6. You can check here.
If you want to use async/await then you need to transpile using Babel for your node version.
Edit:
As you said you are using v7.3, you can use (from v7.0 to v7.5) the --harmony flag to enable the experimental features. To know more about the flag, check this out: What does `node --harmony` do?
I am getting below error when I try to data from redshift with the below mentioned code
var jdbc = new ( require('jdbc') );
var config = {
libpath: 'C:/Users/ABCD/Desktop/jar/RedshiftJDBC41-1.1.6.1006.jar',
//libs: [__dirname + 'path/to/other/jars.jar'],
drivername: 'com.amazon.redshift.jdbc41.Driver',
url: 'jdbc:redshift://examplecluster.abc123xyz789.us-west-2.redshift.amazonaws.com:5439/dev',
user: 'xxxx',
password: 'xxxxx'
};
jdbc.initialize(config, function(err, res) {
if (err) {
console.log(err);
}
});
var genericQueryHandler = function(err, results) {
if (err) {
console.log(err);
} else if (results) {
console.log(results);
}
jdbc.close(function(err) {
if(err) {
console.log(err);
} else {
console.log("Connection closed successfully!");
}
});
};
jdbc.open(function(err, conn) {
if (conn) {
// SELECT statements are called with executeQuery
jdbc.executeQuery("select * from information_schema.tables", genericQueryHandler);
}
});
Error:
C:\Users\ABCD> node redshift.js
C:\Users\ABCD\node_modules\jdbc\lib\jdbc.js:62>
if(this._props.getPropertySync('user') === undefined){>
^ TypeError: undefined is not a function
at JDBCConn.initialize
(C:\Users\ABCD\node_modules\jdbc\lib\jdbc.js:62:20)
at Object.<anonymous>
(C:\Users\ABCD\Desktop\AngularJS\redshift.js:15:6)
at Module._compile (module.js:460:26)
at Object.Module._extensions..js (module.js:478:10)
at Module.load (module.js:355:32)
at Function.Module._load (module.js:310:12)
at Function.Module.runMain (module.js:501:10)
at startup (node.js:129:16)
at node.js:814:3
Could you please let me know whether there is nay issue with the above mentioned node jdbc usage for redshift?
Please be aware that this answer applies to node-jdbc 0.0.15 and earlier only. It will not work for node-jdbc 0.1.1 or later, as the API has been completely reworked and is not backwards-compatible.
Try replacing the two lines in your configuration
user: 'xxxx',
password: 'xxxxx'
with
properties: [
['user', 'xxxx'],
['password', 'xxxxx']
]
I got the same error as you attempting to use Node to connect to a local Oracle XE database. After making the change above I was able to connect. I don't believe the error you are getting is specific to RedShift - I believe it affects all databases.
Note that the properties above have to be specified as an array of 2-element arrays. An object such as the following would seem the obvious way to specify the properties, but it doesn't work:
// Don't do this, it doesn't work.
properties: {
user: 'xxxx',
password: 'xxxxx'
}
To be honest, the fix I've proposed above is a workaround. I only found it by reading the source of the jdbc module. I can't say I'm terribly impressed with this module, what with the example code given in the documentation not working, and with a somewhat counter-intuitive and undocumented format for specifying custom properties.
i tried the following sample code:
var es=require("elasticsearch");
var ejs = require("ejs");
var client = new es.Client({
host: 'localhost:9200',
log: 'trace'
});
client.ping({
requestTimeout: 3000,
// undocumented params are appended to the query string
hello: "elasticsearch"
}, function (error) {
if (error) {
console.error('elasticsearch cluster is down!');
} else {
console.log('All is well');
}
});
client.search({
index: 'message-1',
type: 'message',
body: ejs.Request().query(ejs.MatchAllQuery())
}).then(function (resp) {
var hits = resp.hits.hits;
}, function (err) {
console.trace(err.message);
});
i am getting the following error when i try to run: node metric.js
/home/karunakar/test/metricagg/metric.js:27
body: ejs.Request().query(ejs.MatchAllQuery())
^
TypeError: Object #<Object> has no method 'Request'
at Object.<anonymous> (/home/karunakar/test/metricagg/metric.js:27:13)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Function.Module.runMain (module.js:497:10)
at startup (node.js:119:16)
at node.js:929:3
i could not locate the problem.
-- Thanks
You want the elastic.js module and not ejs, which is a templating engine module.
You can keep the first require("elasticsearch") but the second one should be require("elastic.js") instead of require("ejs")
I am running the code in the tutorial part of node-mysql and its giving me error
Code
var MySQLPool = require("mysql-pool").MySQLPool;
var pool = new MySQLPool({
poolSize: 4,
user: 'root',
password: 'root',
database: 'test'
});
pool.query("SELECT 'Hello, World!' AS hello", function(err, rows, fields) {
if(err) throw err;
console.log(rows[0].hello);
});
for(var i = 0; i < 10; ++i) {
pool.query("SELECT SLEEP(2), ? AS i", [i], function(err, rows, fields) {
if(err) throw err;
console.log("Slept: " + rows[0].i);
});
}
ERROR:
/home/comapq/Works/Nodejs/Codes/node_modules/mysql-pool/lib/mysql-pool/pool.js:158
for(var key in Client.prototype) {
^
TypeError: Cannot read property 'prototype' of undefined
at MySQLPool._populate (/home/comapq/Works/Nodejs/Codes/node_modules/mysql-pool/lib/mysql-pool/pool.js:158:23)
at new MySQLPool (/home/comapq/Works/Nodejs/Codes/node_modules/mysql-pool/lib/mysql-pool/pool.js:44:7)
at Object. (/home/comapq/Works/Nodejs/Codes/test-mysql-3.js:2:12)
at Module._compile (module.js:449:26)
at Object.Module._extensions..js (module.js:467:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Module.runMain (module.js:492:10)
at process.startup.processNextTick.process._tickCallback (node.js:244:9)
After a bit of research I found the problem. You probably installed mysql like this:
npm install mysql
This grabs the latest mysql package that is 2.0.0-alpha5(development phase, mostly untested). You need to install the latest stable version of mysql:
npm install mysql#0.9.6