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  • LINQ to SQL does not update when data has changed in database

    - by aximili
    I have this problem where after a field (say Field3 in table MyTable) is updated on the database, MyTable.Field3 (in C#) is still returning the old value. I suspect there is some caching...? How do I force it to: Read the value from the database? OR Update the value in the MyTable class? Or is there anything I miss? Thank you in advance.

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  • YAML, JSON, or XML to store items in a document database

    - by Zubair
    I am creating a document database and I have to decide on a structure for the records which will be represented as strings. The database has to be able to be read from and written to using as many languages as possible using stable libraries in an efficient way. What are the relavant issues I have to consider, and what would you suggest is the ideal format?

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  • How to store wiki sites (vcs)

    - by Eugen
    Hello, as a personal project I am trying to write a wiki with the help of django. I'm a beginner when it comes to web development. I am at the (early) point where I need to decide how to store the wiki sites. I have three approaches in mind and would like to know your suggestion. Flat files I considered a flat file approach with a version control system like git or mercurial. Firstly, I would have some example wikis to look at like http://hatta.sheep.art.pl/. Secondly, the vcs would probably deal with editing conflicts and keeping the edit history, so I would not have to reinvent the wheel. And thirdly, I could probably easily clone the wiki repository, so I (or for that matter others) can have an offline copy of the wiki. On the other hand, as far as I know, I can not use django models with flat files. Then, if I wanted to add fields to a wiki site, like a category, I would need to somehow keep a reference to that flat file in order to associate the fields in the database with the flat file. Besides, I don't know if it is a good idea to have all the wiki sites in one repository. I imagine it is more natural to have kind of like a repository per wiki site resp. file. Last but not least, I'm not sure, but I think using flat files would limit my deploying capabilities because web hosts maybe don't allow creating files (I'm thinking, for example, of Google App Engine) Storing in a database By storing the wiki sites in the database I can utilize django models and associate arbitrary fields with the wiki site. I probably would also have an easier life deploying the wiki. But I would not get vcs features like history and conflict resolving per se. I searched for django-extensions to help me and I found django-reversion. However, I do not fully understand if it fit my needs. Does it track model changes like for example if I change the django model file, or does it track the content of the models (which would fit my need). Plus, I do not see if django reversion would help me with edit conflicts. Storing a vcs repository in a database field This would be my ideal solution. It would combine the advantages of both previous approaches without the disadvantages. That is; I would have vcs features but I would save the wiki sites in a database. The problem is: I have no idea how feasible that is. I just imagine saving a wiki site/source together with a git/mercurial repository in a database field. Yet, I somehow doubt database fields work like that. So, I'm open for any other approaches but this is what I came up with. Also, if you're interested, you can find the crappy early test I'm working on here http://github.com/eugenkiss/instantwiki-test

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  • R: Removing object from parent environment using rm()

    - by user151410
    Hi, I am trying to remove an object from the parent environment. rm_obj <- function(obj){ a <-deparse(substitute(obj)) print (a) print(ls(envir=sys.frame(-1))) rm(a,envir=sys.frame(-1)) } > x<-c(1,2,3) > rm_obj(x) [1] "x" [1] "rm_obj" "x" Warning message: In rm(a, envir = sys.frame(-1)) : object 'a' not found This will help clarify my misunderstanding regarding frames. Thanks in advance, Russ

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  • object array mobile development

    - by mixm
    Im currently creating a tile-based game for android. Using java via dalvik JVM. im fretting over a decision to represent objects in a particular map. should i use an id based map (2 dimensional integer array) and place game logic in a separate function in the game engine, or create an object array (2 dimensional array of game objects) and store game logic within the class methods. i am thinking about the cost of object creation and garbage collection vs extensibility.

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  • Jersey Rest : How to send Object to a Jersey Service class

    - by Preethi Jain
    I have this functionality in my Application implemented using Jersey Rest WebServices . Once the user is logged into the application , i am creating DTO Object and setting some User Specific Data inside it . Please let me know how can i pass this User Specific DTO Object to the Jersey Service class ?? Please note that , I dont want to use HttpSession to store Data (Because in our Application we have a facility where a User can enter with Multiple ID's in one browser as a result same sessionId will be created by the browser )

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  • How to configure a Firebird Database to run in memory

    - by Robert
    I'm running a software called Fishbowl inventory and it is running on a firebird database (Windows server 2003) at this time the fishbowl software is running extremely slow when more then one user accesses the software. I'm thinking I maybe able to speed up the application by forcing the database to run "In Memory". However I can not find documentation on how to do this. Any help would be greatly appreciated. Thank you in advance. Robert

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  • How do I corrupt a SQL CE Database?

    - by Peter Tate
    I want to be able to check for a corrupted database at startup, and then repair it programmatically. I can do that easily enough. My problem is that I want to test that things work the way I expect. Does anyone know of a way to purposefully corrupt a database so I can test my code?

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  • How to make a treeview from a database column filepath

    - by DrybLrac
    I have a column in a database table which contains the filepath for each file in the table. how can I make a treeview in c# which will mimic the filepath column in my database. here is what a sample filepath column looks like in the column: jsmith/project1/hello.cs jsmith/project1/what.cs jwilliams/project2/hello.cs

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  • EF Query Object Pattern over Repository Example

    - by Dale Burrell
    I have built a repository which only exposes IEnumerable based mostly on the examples in "Professional ASP.NET Design Patterns" by Scott Millett. However because he mostly uses NHibernate his example of how to implement the Query Object Pattern, or rather how to best translate the query into something useful in EF, is a bit lacking. I am looking for a good example of an implementation of the Query Object Pattern using EF4.

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  • Default Value or Binding in "Transfer SQL Server Object Task"

    - by Kronass
    Hi, I want to move 500 table from Database to other with their data and constraints all the tables have column who has default value, I used SSIS using "Transfer SQL Server Object Task" and I choose to copy all tables, copy data and primary keys, it copies the table except the default bindings I tried in SQL Server 2008 CopyAllDRIObjects Property but still the same result. How can I copy all tables from database to other with their data and maintaining their constraints.

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  • Firefox extension object instantiating

    - by Michael
    I want my javascript object to be initialized just once, so each new browser window will not create new data items, new functions, etc... usually we initialize the code at the end of main javascript using load window.addEventListener("load", main.onLoad, false); so once the second browser window opened, the initialization code will start from scratch. However, I would like to re-use the existing object on consequent browsers. Any mechanism that I can use?

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  • Accessing underlying managed object through a COM interface

    - by mfeingold
    I have a third party assembly with a public abstract class implementing a certain COM interface. Something to the effect of [ComVisible(true)] public abstract class SomeClass: ISomeInterface { .... public void Method1() {...} } The actual object is an internal object extending the SomeClass and is instantiated by the third party code Is there a way to access public methods of this class if all I have is the CCW to the ISomeInterface?

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  • Django database caching

    - by hekevintran
    The object user has a foreign key relationship to address. Is there a difference between samples 1 and 2? Does sample 1 run the query multiple times? Or is the address object cached? # Sample 1 country = user.address.country city = user.address.city state = user.address.state # Sample 2 address = user.address country = address.country city = address.city state = address.state

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  • Update local sqlite database from Adobe AIR application

    - by Kiran
    I have a local sqlite database which is created by an IE addon. The sqlite database cannot be updated from a Adobe AIR application which I use as a frontend. The exception is as follows SQLError:'Error #3132:Datatype type mismatch.',details:'could not convert floating point value to integer without loss of data.',operation:'execute',detailID:'2302'

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  • object reference is not set to an instance of an object in sharepoint while deploying the webpart us

    - by girish
    Hello, i m new to sharepoint and i m trying to create one webpart (hello word) in visual studio 2008 using sharepoint extension... solution is successfully build but it gives me error as soon as i start deploy it.... I have specified the Sharepoint site url in the Project solution property.... Can u please give me suggession for this why i m getting the error...Object Reference not set to an instance of an object.

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  • problem with unicode in javaEE and save question mark in database

    - by Jeus
    when i insert persian information with use JEE6(JSF and JPA) my information save question mark for example "???" === "???" my database is Mysql and my table is UTF-8 . when insert persian data directly in database is correct and save correct. i know that with change one property in JEE my problem go to solved but i don`t know where is it ?

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  • data structure algorithms for database searching

    - by Ygam
    I was used to the traditional way of doing database searching with the following using wildcards for term searches using where clause for specific data like addresses and names but at other times, I found these common methods to produce code that is so bloated, especially when it comes to complex searches. Are there algorithms out there that you use for complex database searching? I tried to look for some but had a hard time doing so. I stumbled accross the binary search but I can't find a use for it :(

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  • How To Automatically Script SQL Server: 'Generate Scripts' for SQL Database

    - by skimania
    I want to run scheduled nightly exports of my database code into my SVN source. It's easy to schedule automated check-in's into svn from a folder, but scheduling the export from SQL in SQL Management Studio is Right click target database, choose Tasks Generate Scripts. Follow the wizard and presto you've got scripts in a folder. Is it possible to extract a single script that the wizard generates, and stuff that into a stored proc which I can run nightly? Ideas?

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  • Unable to cast object of type MyObject to type MyObject

    - by Robert W
    I have this scenario where a webservice method I'm consuming in C# returns a Business object, when calling the webservice method with the following code I get the exception "Unable to cast object of type ContactInfo to type ContactInfo" in the reference.cs class of the web reference Code: ContactInfo contactInfo = new ContactInfo(); Contact contact = new Contact(); contactInfo = contact.Load(this.ContactID.Value); Any help would be much appreciated.

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  • JavaScript check if anonymous object has a method

    - by Baddie
    How can I check if an anonymous object that was created as such: var myObj = { prop1: 'no', prop2: function () { return false; } } does indeed have a prop2 defined? prop2 will always be defined as a function, but for some objects it is not required and will not be defined. I tried what was suggested here: http://stackoverflow.com/questions/595766/how-to-determine-if-native-javascript-object-has-a-property-method but I don't think it works for anonymous objects .

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