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• What's the difference between data model and object model?

  - by user198729

  CWM is data modeling UML is object modeling. Can someone explain the difference that a layman can understand?

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• JUnit test failing - complaining of missing data that was just inserted

  - by Collin Peters

  I have an extremely odd problem in my JUnit tests that I just can't seem to nail down. I have a multi-module java webapp project with a fairly standard structure (DAO's, service clasess, etc...). Within this project I have a 'core' project which contains some abstracted setup code which inserts a test user along with the necessary items for a user (in this case an 'enterprise', so a user must belong to an enterprise and this is enforced at the database level) Fairly simple so far... but here is where the strangeness begins some tests fail to run and throw a database exception where it complains that a user cannot be inserted because an enterprise does not exist. But it just created the enterprise in the preceding line of code! And there was no errors in the insertion of the enterprise. Stranger yet, if this test class is run by itself everything works fine. It is only when the test is run as part of the project that it fails! And the exact same abstracted code was run by 10+ tests before the one that fails! f I have been banging my head against a wall with this for days and haven't really made any progress. I'm not even sure what information to offer up to help diagnose this. Using JUnit 4.4, Spring 2.5.6, iBatis 2.3.0, Postgresql 8.3 Switching to org.springframework.jdbc.datasource.DriverManagerDataSource from org.apache.commons.dbcp.BasicDataSource changed the problem. Using DriverManagerDataSource the tests work for the first time, but now all of a sudden a lot of data isn't rolled back in the database! It leaves everything behind. All with no errors Tests fail when run via Eclipse & Maven Please ask for any info which may help me solve my problem!

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• How to use PHP Load Data Infile to replace the current copy of the table with the new one?

  - by NJTechGuy

  We get a new copy of data in a pipe-delimited text file from time to time. I have to refresh the table or in other words, replace the existing copy with that of the newly generated copy (output.txt). Any ideas are highly appreciated. Thank you..

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• What is a 'better' approach to query/save from server: DTO or Wcf Data Services?

  - by bonefisher

  From my perspective, the Data Services and their query approach is useful when querying simple object graphs from your server-side domain model. But when you want to query complex dependencies I couldn't create anything good out of it. The classic DTO approach is fine-grained and can handle everything, but the downside is that you have to create Dto classes for every type of server-request which is time consuming and you have to synchronize the Dto type with your domain entity/business logic.

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• How to recover data from a table, and store that into list?

  - by Wilhelm

  How can I get ALL the data from a table of my DB (mySQL) using hibernate, and store the output into List of Objects? I'll use this List, to populate a JTable.

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• If I create a transient property in the model, isn't this managed by core data then?

  - by mystify

  Just to grok this: If I had a transient property, lets say averagePrice, and I mark that as "transient" in the data modeler: This will not be persistet, and no column will be created in SQLite for that? And: If I make my own NSManagedObject subclass with an averagePrice property, does it make any sense to model that property in the xcdatamodel file? Would it make a difference if I would simply create a property in my subclass and not model that in the entity? (I think: yes, it doesn't matter at all ... but not sure)

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• Can anybody give me a complete list of data structure supported in Java(not in util package)?

  - by Kavin

  I want to know what kinds of data structure in Java and not in the util package? For example: Hashmap, Collection, Set. Please give me a list of them as many as possible. Thank you

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• How to write binary data to a usb flash drive or floppy?

  - by Alon

  Hi I need to write my own binary raw data to a flash drive (like a disk on key) or a floppy using C#. The result will be my custom file system from my program. Any ideas? Thank you.

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• Which data structures and algorithms book should I buy?

  - by Hei

  I know C and C++ and I have some experience with Java, but I don't know too much about Algorithms and Data Structures. I did a search on Amazon, but I don't know what book should I choose. I don't want a book which put its basis only on the theoretic part; I want the practical part too (probably more than the theoretical one :) ). I don't want the code to be implemented in a certain language, but if is in Java, probably I would happier. :)

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• Excel macro to change external data query connections - e.g. point from one database to another

  - by Rory

  I'm looking for a macro/vbs to update all the external data query connections to point at a different server or database. This is a pain to do manually and in versions of Excel before 2007 it sometimes seems impossible to do manually. Anyone have a sample? I see there are different types of connections 'OLEDB' and 'ODBC', so I guess I need to deal with different formats of connection strings?

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• ASP.NET Dynamic Data field value disappears in the browser.

  - by ProfK

  I have an ASP.NET Dynamic Data web application, with an entity called ActivationResource. One of the properties of this is a CellPhone field. Now, whenever I open a List or Details view of one of these entities, the cell phone number displays for a moment then disappears. Anyone have any ideas as to the cause of this mysterious behavior?

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• Good test database on Windows to play around with data retrieval operations in SQL?

  - by ovr

  I need a test database to practice joins and other kinds of data retrieval operations in SQL. What's a good free test database and RDBMS system to use on Windows?

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• Learning SQL & Microsoft Data Services stack - Where to start?

  - by Jim

  I'm trying to learn the Microsoft data / service stack. I want to build a database in SQL Azure and expose it to a c# client application. I've never worked with any SQL database technology. Looking online, everything just seems so confusing -- too many technologies, hard to tell what's new vs what's old. What's the latest technologies to look at, and what (books?) should I be reading?

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• R question. Using lappy on a data.frame and creating new variables w/ output.

  - by Michael

  Hello, I have 13 quantitative variables in a data.frame (called 'UNCA'). The variables are named q01_a, q01_b, ...q01_m. I want to create 13 new variables that have the same values but are coded as a factor. I would like to name these 13 new variables q01_a.F, q01_b.F, ...q01_m.F. Any help would be greatly appreciated!

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• iPhone - is there any way to look at the core data store for a live app?

  - by jtrim

  I've got a live app on the app store that's producing some strange results when the user upgrades versions that I can't reproduce in my dev environment. Does anyone know of a way to inspect the core data store of a live iPhone app?

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• Which is the best data-warehousing tool to learn in the present market?

  - by uma

  I am graduating soon in electrical engineering. I would like to learn a data-warehousing tool. Which of the following would you suggest I learn to help me advance my career, bearing in mind I don't have a computer science degree? business objects; informatica; hyperion; datastage cognos

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• What is the most popular generic collection data structure library for C?

  - by Tom Dalling

  I'm looking for a C library that provides generic collection data structures such as lists, associative arrays, sets, etc. The library should be stable and well tested. I'm basically looking for something better than the crappy C standard library. What C libraries fit this description? EDIT: I'd prefer that the library was cross-platform, but failing that, anything that works on Mac/Linux.

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• Can I do an ASP.NET Dynamic Data project against a Sybase database?

  - by theog

  Or must it be a SQL Server database? If I'm reading the documentation right, as long as I use Entity Framework and not Linq to SQL, I can go against a Sybase data source. But I'm not certain...

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• How to treat RAM data as if it was a real file?

  - by Ole Jak

  So I have some temp data in my prorram (in RAM) I want to somehow make it seem as it is file (for example for sending it into another program which takes a file link as argument)? Is it possible? How to do such thing?

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• Is "this doesn't work" ever a good bug report?

  - by jfar

  I'm having a fight with QA over a bug listing that says: "- Cannot Submit changes on this page - the data is not saved to the database." I threw it back saying it's non-reproducible. QA argues it's valid. Is a bug like that ever good enough?

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• What is the best data-structure for storing elements which will be retrieved only once and then dele

  - by Jay

  I want to design a data-structure for storing elements, which will be retrieved only once after insertion and will be deleted after that. I can't use a stack or queue as the order of retrieval is not guaranteed. [EDIT] - I would like to use contigous memory (I would prefer to avoid doing malloc every now and then) and also I would prefer searchability also.

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• How do I get the application data path in Windows using C++?

  - by Brian T Hannan

  I looked all over the internet and there doesn't seem to be a decent solution that I could find. I want to be able to programmatically in C++ obtain the path "%ALLUSERSPROFILE%\Application Data" that explorer can translate into a real path. Can I do this without relying on third-party code?

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• How can we send a large size of data (>2038 char) from client to Server using ajax?

  - by Dilip

  How can we send a large size of data (2038 char) from client to Server using ajax? I like to send an array of key-pair values of size more than 10KB. I am currently using cookies, is there any other prefered way by which we can send it through an Ajax Call.

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• Heap as memory store same as data structure heap?

  - by Tony

  Is the heap one uses as a data structure (complete binary tree) in Computer Science the same type of heap used in memory where objects are allocated?

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• In a CPU all the memory Signals and DATA go through the memoryController, right?

  - by ~konman

  for example: When the MEM CTRLER wants a instruction register to be populated with the DATA which the next ADDR REGISTER points to. Does it send a signal to the ADDR REGISTER to place the next ADDR on the ADDR bus or does the ADDR go to the MEM CTRLER and is placed on the BUS by the MEM CTRLER?

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