javascript - Need an example of Streaming mySql module with Node & Express -


can provide example of streaming large data sets 'mysql' module, node , express? there documentation, don't understand how query data in smaller segments because don't see examples. appreciated. query works, takes long time because table huge. query works, want request return lets 1,000 rows @ time can start populating data.

link streaming queries documentation here.

here code:

const mysql = require('mysql'); const express = require('express'); const app = express();  const connection = mysql.createconnection({     host: 'us-cdbr-azure-east-a.cloudapp.net',     database: 'eagertobp',     user: ******,     password: *******,     port: '3306' });  connection.connect(function(err) { if(err) {     console.log('error') } else {     console.log('connected'); } });  app.get('/', function(req,resp) {  connection.query("select * submissionanalytics"); console.log('test'); connection     .on('error', function(err) {         console.log('err', err);         // handle error, 'end' event emitted after     })     .on('fields', function(fields) {         console.log('fields hit');         // field packets rows follow     })     .on('result', function(row) {         console.log('result hit');         // pausing connnection useful if processing involves i/o         connection.pause();          processrow(row, function() {             console.log(row);         connection.resume();         });     })     .on('end', function() {         // rows have been received     }); })  app.listen(1337);


Comments

Post a Comment

Popular posts from this blog

asynchronous - C# WinSCP .NET assembly: How to upload multiple files asynchronously -

i using winscp .net assembly uploading files. want upload multiple files asynchronous way. have created method works single upload. public class uploadingdata { private sessionoptions _sessionoptions; private session _session; //connection etc private void onconnected() { foreach (var fileinfo in localfileslist) { var task = task.factory.startnew(() => uploadfilesasync(fileinfo)); } } private async task uploadfilesasync(string file) { string remotefilepath = _session.translatelocalpathtoremote(file, @"/", "/test_data_upload"); var uploading = _session.putfiles(file, remotefilepath, false); //when done await task.run(() => thread.sleep(1000)); } } please suggest me correct way. thanks you can use backgroundworker class this: string[] images = new string[50]; foreach (var path in images) { backgroundworker
Read more

aws api gateway - SerializationException in posting new Records via Dynamodb Proxy Service in API -

i getting "__type": "com.amazon.coral.service#serializationexception" as reply in postman & in test console in api gateway trying post record directly dynamodb using api proxy services.. referring aws article - https://aws.amazon.com/blogs/compute/using-amazon-api-gateway-as-a-proxy-for-dynamodb/ here's mapping { "tablename": "tablenamegoeshere", "item": { "id" : "$context.requestid" "eventname" : "$input.path('$.eventname')", "timestamp" : $input.path('$.timestamp'), "answers": "$util.parsejson($input.path('$.answers'))" } } update: did asked ... , worked if try add array of json objects gives me above same error - here's trying now. please - couldnt find on google well #set($inputroot = $input.path('$')) { "tablename": "answer", "item": {
Read more

asp.net - Problems sending emails from forum -

i have been redesigning site has message board, has been written guy looked after site. it has few problems , written in .asp , uses .mdb files database. you can see whole thing here . feel free post if helps, test thing have set using original files , new database. the basic problem when posts message, supposed email sent them, have posted it. when replies, originator supposed message, replier has been posted. i’d have thought @ point in process there should script/file in postmessage.asp? the postmessage.asp page below. <% option explicit %> <!-- #include virtual="common/adovbs.inc" --> <html> <head> <meta http-equiv="content-type" content="text/html; charset=windows-1252"> <meta name="generator" content="microsoft frontpage 4.0"> <meta name="progid" content="frontpage.editor.document"> <title>new page 2</title> <base target="_self"
Read more