Data are values of qualitative or quantitative variables, belonging to a set of items. Data in computing (or data processing) are represented in a structure, often tabular (represented by rows and columns), a tree (a set of nodes with parent-children relationship) or a graph structure (a set of ...

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0
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1answer
210 views

The best approach to building a mobile service that's also available when the connection drops?

Hopefully this question will be a good suit for P.SE since it is a whiteboard-level 'how can this be done' conceptual question. I'm trying to build a product that needs to be available to someone on ...
1
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0answers
142 views

Matching two lists of data with different conventions

I have two lists of data, A and B. These lists are themselves aggregated from multiple sources, and contain typos, abbreviations not found in the other, and also lack a 1-1 mapping, but will never ...
-1
votes
1answer
1k views

Data aggregation like polyvore.com [closed]

I'm creating a website that is going to aggregate women shoes from across the web into one website. Kinda like polyvore.com does with all their products but mine is only going to be shoes. Which ...
1
vote
2answers
2k views

Design pattern for data privileges

I'm designing a financial system that should grant access to data based on roles and privileges. For example, a manager can see the financial transaction of users under his domain but not information ...
1
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4answers
7k views

Best Practices for Maintaining Uppercase vs Proper Case Data

We have several years of customer data that has been collected over time. I'd guess that 95% of the data (Names, Business Names & Addresses) is in all UPPERCASE format. The data entry tool used ...
3
votes
1answer
387 views

How to process an endless XML data stream

There is an endless data stream of XML messages (and "heartbeats"), that I receive via a telnet connection and through a site-to-site VPN IPsec tunnel. I'm still pondering. What is the best/most ...
8
votes
3answers
249 views

Is a single object to be preferred over multiple variables?

It was quite hard to put what I meant into a title, but it's easy to put into code. C++ Is this int offset_x = 10; int offset_y = 40; ... element.move(offset_x, offset_y); To be preferred over ...
3
votes
2answers
214 views

What's a good format for documenting hundreds of data feeds?

Several governments are starting to publish open data: datasets generated by the goverment, made freely available for citizens to use for value-added app development, analysis, and feedback. For ...
7
votes
2answers
927 views

Why build data models in a dynamic language?

Background This question stems out of an architectural discussion we had at work. For the current project we are using Python and an object oriented database. There are input services that we ...
4
votes
2answers
548 views

Design strategies for storing and validating serial numbers

We are writing software to track Foo Widgets. Each Foo Widget has a serial number. The serial number is an 32-character alphanumeric string. The string is separated into five sets. Each set is ...
1
vote
1answer
449 views

Storing 'sensitive' data in settings file

I'm writing a small utility in AutoIt that connects to Twitter. I would like to store the username and password in the programs setting file, but I know that it needs to be encrypted obviously. ...
1
vote
1answer
58 views

Multiple Display of a Document and persist each viewer change in a single document

i have a scenario where i have to make available a document for viewing and editing to multiple users, the users can edit and view the document at the same time. Now the problem arises here if for ...
2
votes
0answers
299 views

How to organize integration tests and test data for different environments when using Maven Failsafe

I have started to separate my unit tests from my integration tests by using Maven Surefire and Failsafe. Now I'm wondering what good ways there are to deal with separate environments. Take for ...
7
votes
2answers
1k views

Terminology: Really Delete vs set IsDeleted (“soft delete”) flag

I have a site where a regular user can delete records, where what happens is that an IsDeleted flag gets set. On administrative pages, a privileged user can delete records where an actual SQL DELETE ...
1
vote
0answers
125 views

What will be the better way for data retrieval on application that needs to handle limited amount of data? [duplicate]

Just moved this question from Stack Overflow. Since, adding my code snippets itself would make this question really long. Instead, I am pretty interested in knowing a better ways for data retrieval on ...
2
votes
1answer
848 views

How best to merge/sort/page through tons of JSON arrays?

Here's the scenario: Say you have millions of JSON documents stored as text files. Each JSON document is an array of "activity" objects, each of which contain a "created_datetime" attribute. What is ...
1
vote
2answers
259 views

Referential integrity in a database where tuples are not physically deleted

Many modern Relational Database Management Systems automatically support referential integrity, i.e. when you try to delete a tuple which has a reference (in the form of foreign key, for example), the ...
2
votes
1answer
434 views

Pattern for mobile app data synchronisation using HTTP over 3G networks

I have a mobile app built using jquerymobile, PhoneGap and some custom CSS and JavaScript. The data objects are received in JSON and used to display different forms to the user. For example { id: 1, ...
2
votes
1answer
417 views

Design patterns to avoiding breaking the SRP while performing heavy data logging

A class that performs both computations and data logging* seems to have at least two responsibilities. Given a system for which the specifications require heavy data logging, what kind of design ...
14
votes
8answers
1k views

Are there examples of non CRUD approaches?

I'm a programmer but also have worked as an archivist. As archivist it's a lot about keeping data. I often get into arguments with colleagues when it comes to operations on data. I don't like the U ...
5
votes
4answers
793 views

Am I sending large amounts of data sensibly?

I am about to design a video conversion service, that is scalable on the conversion side. The architecture is as follows: Webpage for video upload When done, a message gets sent out to one of ...
2
votes
3answers
763 views

Inter-process and inter-thread data sharing [closed]

I know that operating systems facilitate inter-process and inter-thread data sharing. I want to know about the mechanisms used to facilitate such sharing. I read about "pipes". What are the other ways?...
4
votes
2answers
617 views

Isolating test data in acceptance tests

I'm looking for guidance on how to keep my acceptance tests isolated. Right now the issue I'm having with being able to run the tests in parallel is the database records that are manipulated in the ...
0
votes
3answers
261 views

I need some help creating a non-binary tree (or some other data structure that will better solve my problem)

I have about ten lists of numbers and some strings. Each list has about <= 30K lines. Each line on a list has a distinct number. I need to build an efficient way of finding all the lines in each ...
5
votes
4answers
470 views

Can data classes contain methods for validation?

OK, say I have a data class for a user: public class User { private String firstName; private String lastName; private long personCode; private Date birthDate; private Gender gender; private String ...
1
vote
1answer
69 views

Enforcing Constraints Upon Data Documents of Various Formats

This seems like the sort of problem that must have been solved elegantly long ago, but I haven't the foggiest how to google it and find it. Suppose you're maintaining a large legacy system, which has ...
12
votes
5answers
1k views

What's the proper term for a function inverse to a constructor - to unwrap a value from a data type?

Edit: I'm rephrasing the question a bit. Apparently I caused some confusion because I didn't realize that the term destructor is used in OOP for something quite different - it's a function invoked ...
4
votes
2answers
1k views

Having a generic data type for a database table column, is it “good” practice?

I'm working on a PHP project where some object (class member) may contain different data type. For example : class Property { private $_id; // (PK) private $_ref_id; // the object ...
9
votes
8answers
678 views

When does 'optimizing code' == 'structuring data'?

A recent article by ycombinator lists a comment with principles of a great programmer. #7. Good programmer: I optimize code. Better programmer: I structure data. Best programmer: What's the ...
2
votes
3answers
153 views

Having two sets of infrequently changing data or converting on the fly

I am currently working on a small project in which I work with some "static data", which is extracted from one source. The data might change from time to time (up to once a week). I don't need all of ...
0
votes
2answers
792 views

How should I track approval workflow when users at every security level can create a request?

I am writing a new application that allows users to enter requests. Once a request is entered, it must follow an approval workflow to be finally approved by a user the highest security level. So, ...
0
votes
3answers
4k views

Passing the data of a certain page to another page. Windows Phone 7

The user will fill out information in page 1, and the data will be seen in the other page listed in a listbox. Is it advisable to use data binding? I've been studying/researching about data binding ...
5
votes
1answer
587 views

Data service API design

We're designing a data service that will store a large number of statistics about stocks, including historical data. The client will be a web application, which will need to pull various bits of data ...
1
vote
1answer
571 views

Developing an analytics's system processing large amounts of data - where to start

Imagine you're writing some sort of Web Analytics system - you're recording raw page hits along with some extra things like tagging cookies etc and then producing stats such as Which pages got most ...
2
votes
2answers
129 views

What is the best strategy for transforming unicode strings into filenames?

I have a bunch (thousands) of resources in an RDF/XML file. I am writing a certain subset of the resources to files -- one file for each, and I'm using the resource's title property as the file name. ...
1
vote
1answer
688 views

Countour Mapping API

I have done some searching on Google, but haven't come up with much as of yet. I am wanting to take a set of point data, which I had previously been using to create weighted points for a heat map ...
10
votes
5answers
33k views

Getting data from a webpage in a stable and efficient way

Recently I've learned that using a regex to parse the HTML of a website to get the data you need isn't the best course of action. So my question is simple: What then, is the best / most efficient and ...
1
vote
2answers
768 views

Almost Realtime Data and Web application

I have a computer that is recording 100 different data points into an OPC server. I've written a simple OPC client that can read all of this data. I have a front-end website on a different network ...
0
votes
3answers
325 views

From where do financial firms obtain the stock data to analyze [closed]

I've been thinking about the subject and I've always wondered, from where do they obtain the data that is analized in applications, I've looked at Nasdaq's website and they do not seem to have any ...
0
votes
1answer
746 views

How to get a list of valid addresses?

I need to get a list of valid addresses in 4 or 5 clusters (cities) in both the UK and US. It's to generate sample data for an application that will do geolocation and searching. At the moment I'm ...
27
votes
6answers
27k views

Why the static data members have to be defined outside the class separately in C++ (unlike Java)?

class A { static int foo () {} // ok static int x; // <--- needed to be defined separately in .cpp file }; I don't see a need of having A::x defined separately in a .cpp file (or same file ...
2
votes
4answers
245 views

Data migration to a single shared SQL table

We have three internal web applications we use at my company. Unfortunately none of my predecessors had the foresight of sharing tables amongst those apps. It has become necessary to share some ...
3
votes
4answers
2k views

Data Structures usage and motivational aspects

For long student life I was always wondering why there are so many of them yet there seems to be lack of usage at all in many of them. The opinion didn't really change when I got a job. We have ...
2
votes
1answer
150 views

Ensure data entered by users adjusts to what actually is

This is more of a usability issue I'd say, looking of suggestions on it. I have a system that depends on the data entered by the users to be correct, as in the address exists, the name is correct, ...
1
vote
1answer
181 views

Approach for housekeeping production data

If you are going write a set of program to housekeep the production data, how can you ensure your program will work correctly? We cannot housekeep the data based on their creation time. We would ...
3
votes
2answers
747 views

How to handle encryption key conflicts when synchronizing data?

Assume that there is data that gets synchronized between several devices. The data is protected with a symmetric encryption algorithm and a key. The key is stored on each device and encrypted with a ...
3
votes
3answers
365 views

Designing access to file-based “database”

It happened frequently that I have to provide access to a bunch of files organized in a directory tree according to some (sometimes loosely specified) rules. My standard pattern is to provide a ...
1
vote
2answers
305 views

Getting and maintaining data from a large number of sources on the web [closed]

For the sake of an exercice I want to aggregate price listings with prices coming from a series of web sites in a structured form (XML, JSON...). If I have control on both sides how can I go about ...
3
votes
3answers
415 views

Where can I locate business data to use in my application?

This question talks about any and all free public raw data which appeared to have valuable pieces but nothing that really provides what I am looking for. Instead of using a socially defined listing ...
8
votes
3answers
2k views

How do Data Scientists Use Python? [closed]

Do you know how Data Scientists use Python and if it requires data, where I can get sample data to practice with? I'm currently learning the language and plan on applying for Data Scientists jobs, so ...