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• How can I return JSON from node.js backend to frontend without reloading or re-rendering the page?

  - by poleapple

  I am working with node.js. I want to press a search button, make some rest api calls to another server in the backend and return the json back to the front end, and reload a div in the front end so that I won't have to refresh the page. Now I know I can reload just a div with jQuery or just Javascript dom manipulation. But how do I make it call a method on the server side? I could have a submit button and it will make a post request and I can catch it and make my api calls from there, however from the node.js side, when I return, I will have to render the page again. How do I go about returning JSON from the back end to the front end without re-rendering or refreshing my page? Thanks.

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• Query takes time on comparing non numeric data of two tables, how to optimize it?

  - by Muhammad Kashif Nadeem

  I have two DBs. The 1st db has CallsRecords table and 2nd db has Contacts table, both are on SQL Server 2005. Below is the sample of two tables. Contact table has 1,50,000 records CallsRecords has 75,000 records Indexes on CallsRecords: CallFrom CallTo PickUP Indexes on Contacts: PhoneNumber I am using this query to find matches but it take more than 7 minutes. SELECT * FROM CallsRecords r INNER JOIN Contact c ON r.CallFrom = c.PhoneNumber OR r.CallTo = c.PhoneNumber OR r.PickUp = c.PhoneNumber In Estimated execution plan inner join cost 95% Any help to optimize it.

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• Need Help with Page Life Cycle(I think it is screwing me up)

  - by chobo2

  Hi I have dragged a empty asp.net table onto my webform. I generate all the rows in the code behind those. Now my table gets filled up and has dropdown lists. When the user hits save I go through all the rows and update the values from the dropdownlist in the db. This works all great. However if 2 columns have each have "Present" then those 2 columns should be not be shown anymore and 2 new columns get put in its place with other dropdown lists. This all works. However you have to refresh the entire page to for the 2 columns that should go away to go away. So what I tried to do is at the end of the button click event. Clear the whole table and then regenerate it. However when I do this then my values are not saved to the database anymore for whatever reason. if (IsPostBack == false) { // check if dummy variables exist in db- If true just generate tables with values in db. If not generate them. } else { // grab the values from the database // generate tables with the values } btn click event { go through all rows in table(foreach loop) update each column in the database with cells in each row. while in foreach loop. //done } So this is how it goes and it works expect(all correct values are saved) the table is just not updated to the user. Does not work if (IsPostBack == false) { // same code as above } // if postback is true do nothing. By the time it gets to the click event it says there is zero rows in the table so nothing happens. btn click event { // same code } Fails also. if (IsPostBack == false) { // same code as above } else { // same code as above but moved into its own method. gernerateTable(); } btn click event { // update all rows // once done clear the Tables rows // call generateTable() } This last one does nothing as for some reason it does not update anything. I don't understand why. So what am I doing wrong with this life cycle something in my process is wrong. The code works just not when I want the table to be updated right away.

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• Client / Server security from mobile to website

  - by Amir Latif

  Hey. Am new to the world of web programming and learning a bunch of fairly simple new pieces of tech, trying to piece them all together. So, we have a simple client (currently iPhone, to move to J2ME soon) that's pulling down lists of data via PHP, which is talking to a MySQL db. I have a rudimentary user/login system so that data is only served to someone who matches a known user etc, either on the website or on the client. All the php scripts on the website that query the DB check to make sure an active session is in place, otherwise dumping the user back to the login screen. I've read a little about SSL and want to know if that is sufficient to protect the website AND the data passing between the server and the client?

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• Store data in file system rather than SQL or Oracle database.

  - by nunu

  Hi All, As I am working on Employee Management system, I have two table (for example) in database as given below. EmployeeMaster (DB table structure) EmployeeID (PK) | EmployeeName | City MonthMaster (DB table structure) Month | Year | EmployeeID (FK) | PrenentDays | BasicSalary Now my question is, I want to store data in file system rather than storing data in SQL or ORACLE. I want my data in file system storage for Insert, Edit and Delete opration with keeping relation with objects too. I am a C# developer, Could anybody have thoughts or idea on it. (To store data in file system with keeping relations between them) Thanks in advance. Any ideas on it?

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• Spring and JUnit annotated tests: creating fixtures in separate transactions

  - by Francois

  I am testing my Hibernate DAOs with Spring and JUnit. I would like each test method to start with a pre-populated DB, i.e. the Java objects have been saved in the DB, in a Hibernate transaction that has already been committed. How can I do this? With @After and @Before, methods execute in the same Hibernate transaction as the methods decorated with @Test and @Transactional (first level cache may not be flushed by the time the real test method starts). @BeforeTransaction and @AfterTransaction apparently cannot work with Hibernate because they don't create transactions even if the method is annotated with @Transactional in addition to @Before/AfterTransaction. Any suggestion?

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• What does it take to get the "LyricArtist" from this XML feed using Nokogiri?

  - by fail.

  First the xml: http://api.chartlyrics.com/apiv1.asmx//GetLyric?lyricId=90&lyricCheckSum=9600c891e35f602eb6e1605fb7b5229e doc = Nokogiri::XML(open("http://api.chartlyrics.com/apiv1.asmx//GetLyric?lyricId=90&lyricCheckSum=9600c891e35f602eb6e1605fb7b5229e")) Successfully will grab the document content. After this point i am unable to get inside and grab data and i am not sure why? For example, i would expect: doc.xpath("//LyricArtist") To kick back the artist but it does not. I have tried the same thing with other feeds, such as the default RSS feed that any wordpress installation provides and if i do something like: doc.xpath("//link") I get a list of all the "links". I am definitely missing something and would love your input. thank you!!

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• Convert Google results object (pure js) to Python object

  - by colwilson

  So I'm trying to use Google Map suggest API to request place name suggestions. Unfortunately I can't find the docs for this bit. Here is an example URI: http://maps.google.com/maps/suggest?q=lon&cp=3&ll=55.0,-3.5&spn=11.9,1.2&hl=en&gl=uk&v=2 which returns: {suggestion:[{query:"London",... I want to use this in python (2.5). Now in proper JSON there would have been quotations around the keys like so: {"suggestion":[{"query":"London",... and I could have used simplejson or something, but as it is I'm a bit stuck. There are two possible solutions here; either I can get to the API code and find an option to return proper JSON, or I do that in python. Any ideas please.

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• How to structure a Visual Studio project for the data access layer

  - by Akk

  I currently have a project that uses various DB access technologies mainly for showcasing or for demos. Currently we have: Namespace App.Data (App.Data.dll) Folder NHibernate Folder EntityFramework Folder LinqToSql The above structure is ok as we only use Sql Server as the DB. But going forward we will be including Oracle, MySql etc. So what would be a better structure with this in mind? I thought about: Namespace App.Data.SqlServer (App.Data.SqlServer.dll) Folder NHibernate Folder EntityFramework Folder LinqToSql Or would it just be better to have separate assemblies for each database and access technology?: Namespace App.Data.SqlServer.NHibernate (App.Data.SqlServer.NHibernate.dll) Namespace App.Data.SqlServer.EntityFramework(App.Data.SqlServer.EntityFramework.dll) Namespace App.Data.Oracle.NHibernate (App.Data.Oracle.NHibernate.dll) Namespace App.Data.MySql.NHibernate (App.Data.MySql.Oracle.dll)

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• Why is Scaffolding Not Working in Ruby on Rails?

  - by Timmy

  I created a controller and a model. The controller is called "Admin" and the model is called "Album". I edited database.yml with proper info and did the rake db:migrate command which didn't return any errors and did migrate the db inside schema.rb. Inside the controller I wrote: class AdminController < ApplicationController scaffold :album end Next I started my server and went to http://localhost:3000/admin but instead of seeing the typical CRUD page I get the following error: app/controllers/admin_controller.rb:3 Request Parameters: None Show session dump --- flash: !map:ActionController::Flash::FlashHash {} Response Headers: {"cookie"=>[], "Cache-Control"=>"no-cache"} Any idea why?

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• How to scan for available networks for Blackberry device from application?

  - by amsiddh

  Hi All, Is there any RIM API available which will help to get the list of available network service or only Wi-Fi networks for a device and set selected network access point for any network communications? Is it possible programmatically to disable the Mobile networks like GPRS, WAP, etc? For Ex: When a application is started it should scan for WiFi connections (even if there are no previous WiFi network access points are set on device) and list the available WiFi connection. Then user will select the appropriate WiFi connection to connect for any network communication. Outside the application any internet communication (like browser or any other application) should done through same selected WiFi connection. The scanning for WiFi and setting the connection is almost similar to Blackberry WiFi Setup. If anyone know how to implement this using available RIM API and let me know its possible or not. Please share if anyone have any code snippet related to this. I am looking for OS v4.5, 4.7, and 5.0. Thanks, siddh.

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• How do I design a web service (microsoft) that can be consumed by multiple end points?

  - by Ben McCormack

  My company is planning to implement a solution in multiple applications that will help to validate mailing addresses at the point of data entry. We're using UPS's Extended Address Validation (XAV) web service API to validate the addresses. Our current plan is to build a .NET web service that can be used to communicate between our applications and the UPS API. We have applications in VB6, classic ASP, and .NET 2.0, so we'd like to implement a solution that can be easily consumed by each of these programming environments. What are our (Microsoft) options for designing a web service that can be consumed by multiple clients? In particular, is there a way to design a single web service that can respond with JSON (in case we want to validate our web page using javascript) in addition to XML? I'm new to designing web services and want to make sure we consider all of our options. I've heard terms like asmx, WCF, OData, etc., but I don't know which frameworks will support what we're trying to do and where to start.

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• Android: Best way/library to write an app that simply gets/sets your Facebook status, sends Facebook

  - by D.

  I have the Android Facebook-Connect library running in my emulator and I'm able to set my status with the Facebook API I have setup. However, I don't know where to go from there? Am I supposed to use the session key that this library allows me to get and make some Facebook API calls? I haven't found any code examples to even see what the proper syntax is. Am I better off using another library? I tried fbrocket with limited luck(I get a "server error 104 - Incorrect signature"). Thanks for any help.

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• How to add .Net3.5 dll into .Net2.0 project?

  - by macias

  I have a dll which is based on .net 3.5 -- it uses internally for example Linq, but the exposed API is straightforward, no fancy stuff. Since C# generics are resolved at compile time I assume that for calling party all it counts is API (all public parts). However when I try to use this dll from net2.0 project I get info, that the dll cannot be referenced because the dll or one of its dependencies requires a later version of .net framework. I can install any .net version I want on target computer (when entire app is installed), but I cannot change .net version for the project itself. So: how to solve this? When adding a C dll to this project I had no such problems, so are C# dlls self-contained or not?

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• Custom keys for Google App Engine models (Python)

  - by Cameron

  First off, I'm relatively new to Google App Engine, so I'm probably doing something silly. Say I've got a model Foo: class Foo(db.Model): name = db.StringProperty() I want to use name as a unique key for every Foo object. How is this done? When I want to get a specific Foo object, I currently query the datastore for all Foo objects with the target unique name, but queries are slow (plus it's a pain to ensure that name is unique when each new Foo is created). There's got to be a better way to do this! Thanks.

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• Global Import Aliasing in .NET

  - by Josh Stodola

  Using import aliasing in a single class, we can reference class library namespaces by assigning our own custom alias like this: Imports Db = Company.Lib.Data.Objects And then we are able to reference the classes inside of Company.Lib.Data.Objects by using the Db alias that we assigned. Is it possible to do this at the global level so that the alias is applied to the entire solution instead of the given file? Currently, we are working with web applications, so I was hoping we could add something to web.config, but I am also interested in whether or not this is possible with windows forms, console apps, and/or class libraries.

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• Is it reasonable to start using Google Maps for Flash rather than Javascript version?

  - by Vafello

  I am planning to build a web application highly based on Google Maps API. I am considering either using the Javascript version, or the Flash version. I would like to create an interface which will be quite rich. Should I go for JS version of the API or Flash one? Also I do not plan to purchase the Flash, so ideally I would like to use some free Flex SDK that supports ActionScript. What would you recommend? Is it more reasonable to use JS or maybe better use the Flash Version. What are the limitations, pros and cons?

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• SQLite not pluralizing Table Names

  - by weenet

  I am using SQLite as my db during development, and I want to postpone actually creating a final database until my domains are fully mapped. So I have this in my Global.asax.cs file: private void InitializeNHibernateSession() { Configuration cfg = NHibernateSession.Init( webSessionStorage, new [] { Server.MapPath("~/bin/MyNamespace.Data.dll") }, new AutoPersistenceModelGenerator().Generate(), Server.MapPath("~/NHibernate.config")); if (ConfigurationManager.AppSettings["DbGen"] == "true") { var export = new SchemaExport(cfg); export.Execute(true, true, false, NHibernateSession.Current.Connection, File.CreateText(@"DDL.sql")); } } The AutoPersistenceModelGenerator hooks up the various conventions, including a TableNameConvention like so: public void Apply(FluentNHibernate.Conventions.Instances.IClassInstance instance) { instance.Table(Inflector.Net.Inflector.Pluralize(instance.EntityType.Name)); } This is working nicely execpt that the sqlite db generated does not have pluralized table names. Any idea what I'm missing? Thanks.

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• SQL Script to clear database tables.

  - by pencilslate

  I have a need to take backup of a SQL Server Db with tons of data in it and import into another environment for updating and testing. Since, i am not interested in the data, i just want to recreate the schema on my other server. There is an option called 'Generate Script', but is throwing errors running them on the target server. Curious, if anyone attempted to write a SQL script that would run through all the tables in the db and clear the rows, thereby i could just create the schema backup as .bak file and restore it into another server.

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• Why I am not that user after I load cookies?

  - by MoreFreeze

  I want to grab some site data, but it must be a login account. So I register it and login, I found some API about this site that can be used to grab data. I use this Chrome plugin "cookie.txt export" export cookies.txt, I copy all content it export and use following cmd like wget -x --load-cookies cookies.txt http://www.example.com/api/name=xxxx but it doesn't work. It download the page that need I login. So I think this site has some other verification strategy, how can I pass it? Whether I must input in browser manually?

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• How to make Date locale-independent?

  - by folone

  I have a db, that stores dates in OleDateTime format, in GMT timezone. I've implemented a class, extending Date in java to represent that in classic date format. But my class is locale-dependent (I'm in GMT+2). Therefore, it converts the date in the db as date - 2 hours. How do I make it convert the date correctly? I want my class to be locale-independent, always using GMT timezone. Actually, the question is: class MyOleDateTime extends Date { static { Locale.setDefault(WhatGoesHere?) } // ... some constructors // ... some methods }

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• SQL Server architecture guidance

  - by Liam

  Hi, We are designing a new version of our existing product on a new schema. Its an internal web application with possibly 100 concurrent users (max)This will run on a SQL Server 2008 database. On of the discussion items recently is whether we should have a single database of split the database for performance reasons across 2 separate databases. The database could grow anywhere from 50-100GB over 5 years. We are Developers and not DBAs so it would be nice to get some general guidance. [I know the answer is not simple as it depends on the schema, archiving policy, amount of data etc. ] Option 1 Single Main Database [This is my preferred option]. The plan would be to have all the tables in a single database and possibly to use file groups and partitioning to separate the data if required across multiple disks. [Use schema if appropriate]. This should deal with the performance concerns One of the comments wrt this was that the a single server instance would still be processing this data so there would still be a processing bottle neck. For reporting we could have a separate reporting DB but this is still being discussed. Option 2 Split the database into 2 separate databases DB1 - Customers, Accounts, Customer resources etc DB2 - This would contain the bulk of the data [i.e. Vehicle tracking data, financial transaction tables etc]. These tables would typically contain a lot of data. [It could reside on a separate server if required] This plan would involve keeping the main data in a smaller database [DB1] and retaining the [mainly] read only transaction type data in a separate DB [DB2]. The UI would mainly read from DB1 and thus be more responsive. [I'm aware that this option makes it harder for Referential Integrity to be enforced.] Points for consideration As we are at the design stage we can at least make proper use of indexes to deal performance issues so thats why option 1 to me is attractive and its more of a standard approach. For both options we are considering implementing an archiving database. Apologies for the long Question. In summary the question is 1 DB or 2? Thanks in advance, Liam

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• Android contacts extraction

  - by Schildmeijer

  Are there any possibilities to extract contacts in some of the following formats, vCard, hCard or json/xml, using the standard Android API?

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• Is there a way to find the nearest cross streets for an address?

  - by Janak

  Using the google maps API is there a way to programmatically find the nearest cross streets, given a particular street address?

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• Excel Add-in memory explosion

  - by tsinik

  I wrote a small .NET add in to excel 2007 that read data from external c++ api and display it inside an excel. The task manager shows that I'm having a memory leak (the memory usage is inflate linearly up to 250MB after whitch it throws an "Excel cannot complete this task with available resources error") but the problem disappears as soon as I minimize the excel window. The api uses delegates to return data and I update it into a dictionary. another thread is updating the excel from the dictionary every second. It is unlikely that the unmanaged code is responsible of the leak. Does anybody have an idea what can cause this? 10x!

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