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  • ASP.NET MVC2 Data Access Layer

    - by Paul
    For a small/medium sized project I'm trying to figure out what is the 'ideal' way to have a domain layer and data access layer. My opinions on coupling tend to be more towards the view that the domain models should not be tightly coupled with the database layer, in other words the data access layer shouldn't actually know anything about the domain objects. I've been looking at Linq-to-sql and it wants to use its own models that it creates, and so it ends up VERY tightly coupled. Whilst I love the way you use linq-to-sql in code I really don't like the way it wants to make its own domain objects. What are some alternatives that I should consider? I tried use NHibernate but I did not like the way I had to use to query and get different objects. I honestly love the syntax and way you use linq, I just don't want it to be so tightly coupled to domain objects.

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  • How do I start a second console application in Visual Studio when one is already running

    - by Kettenbach
    Hi All, I am working through some examples in a WCF book. There is a Host project and Client project within a single solution. Both are console applications. The Host is the startup app, but the Client app doesn't seem to open the Console like the book says. Book says while the Host is running, run the Client. The Run button is disabled tho as it is already running. The book example definitely has them in the same solution and a single instance of Visual Studio. Anyways, what am I missing here? I have done this with two instances of VS, but I truly have never does this in a single instance. Any help is always appreciated. Cheers, ~ck in San Diego

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  • Data structure for Settlers of Catan map?

    - by templatetypedef
    Hello all- A while back someone asked me if I knew of a nice way to encode the information for the game Settlers of Catan. This would require storing a hexagonal grid in a way where each hex can have data associated with it. More importantly, though, I would need some way of efficiently looking up vertices and edges on the sides of these hexagons, since that's where all the action is. My question is this: is there a good, simple data structure for storing a hexagonal grid while allowing for fast lookup of hexagons, edges between hexagons, and vertices at the intersections of hexagons? I know that general structures like a winged-edge or quad-edge could do this, but that seems like massive overkill. Thanks!

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  • Advanced SQL Data Compare throught multiple tables

    - by podosta
    Hello, Consider the situation below. Two tables (A & B), in two environments (DEV & TEST), with records in those tables. If you look the content of the tables, you understand that functionnal data are identical. I mean except the PK and FK values, the name Roger is sill connected to Fruit & Vegetable. In DEV environment : Table A 1 Roger 2 Kevin Table B (italic field is FK to table A) 1 1 Fruit 2 1 Vegetable 3 2 Meat In TEST environment : Table A 4 Roger 5 Kevin Table B (italic field is FK to table A) 7 4 Fruit 8 4 Vegetable 9 5 Meat I'm looking for a SQL Data Compare tool which will tell me there is no difference in the above case. Or if there is, it will generate insert & update scripts with the right order (insert first in A then B) Thanks a lot guys, Grégoire

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  • How to find out memory layout of your data structure implementation on Linux 64bit machine

    - by ajay
    In this article, http://cacm.acm.org/magazines/2010/7/95061-youre-doing-it-wrong/fulltext the author talks about the memory layouts of 2 data structures - The Binary Heap and the B-Heap and compares how one has better memory layout than the other. http://deliveryimages.acm.org/10.1145/1790000/1785434/figs/f5.jpg http://deliveryimages.acm.org/10.1145/1790000/1785434/figs/f6.jpg I want to get hands on experience on this. I have an implementation of a N-Ary Tree and I want to find out the memory layout of my data structure. What is the best way to come up with a memory layout like the one in the article? Secondly, I think it is easier to identify the memory layout if it is an array based implementation. If the implementation of a Tree uses pointers then what Tools do we have or what kind of approach is required to map it's memory layout? Thanks!

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  • operator not defined for System.Data.SqlClient.SqlConnection and System.Data.SqlClient.SqlConnection

    - by Beta033
    i hope i'm just doing something wrong here. Ideally i'm trying to open the connection, open a transaction execute a ton of prebuilt sqlstatements (with parameters) against this connection then close the connection. ideally all in the same batch. It's easy enough to wrap this all in a for loop, however i'd like to use the forEach function of the list generic to set the connection as it'll probably be faster than my implementation of calling List.Item(i) in the loop but i get some strange errors. Dim sqlStatements As List(Of SqlCommand) = New List(Of SqlCommand) Dim conn As SqlClient.SqlConnection = New SqlConnection("...") sqlStatements.Item(0).Connection = conn 'Works sqlStatements.ForEach(Function(ByRef cmd As SqlCommand) cmd.Connection = conn) 'ERROR: Operator '=' is not defined for types 'System.Data.SqlClient.SqlConnection' 'and 'System.Data.SqlClient.SqlConnection What does this error really mean?

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  • How can I simulate this application hang scenario?

    - by Pwninstein
    I have a Windows Forms app that itself launches different threads to do different kinds of work. Occasionally, ALL threads (including the UI thread) become frozen, and my app becomes unresponsive. I've decided it may be a Garbage Collector-related issue, as the GC will freeze all managed threads temporarily. To verify that just managed threads are frozen, I spin up an unmanaged one that writes to a "heartbeat" file with a timestamp every second, and it is not affected (i.e. it still runs): public delegate void ThreadProc(); [DllImport("UnmanagedTest.dll", EntryPoint = "MyUnmanagedFunction")] public static extern void MyUnmanagedFunction(); [DllImport("kernel32")] public static extern IntPtr CreateThread( IntPtr lpThreadAttributes, uint dwStackSize, IntPtr lpStartAddress, IntPtr lpParameter, uint dwCreationFlags, out uint dwThreadId); uint threadId; ThreadProc proc = new ThreadProc(MyUnmanagedFunction); IntPtr functionPointer = Marshal.GetFunctionPointerForDelegate(proc); IntPtr threadHandle = CreateThread(IntPtr.Zero, 0, functionPointer, IntPtr.Zero, 0, out threadId); My Question is: how can I simulate this situation, where all managed threads are suspended but unmanaged ones keep on spinning? My first stab: private void button1_Click(object sender, EventArgs e) { Thread t = new Thread(new ThreadStart(delegate { new Hanger(); GC.Collect(2, GCCollectionMode.Forced); })); t.Start(); } class Hanger{ private int[] m_Integers = new int[10000000]; public Hanger() { } ~Hanger() { Console.WriteLine("About to hang..."); //This doesn't reproduce the desired behavior //while (true) ; //Neither does this //Thread.Sleep(System.Threading.Timeout.Infinite); } } Thanks in advance!!

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  • Calling generic method in spring.net application context

    - by Bert Vandamme
    Hi, I'm trying to invoke this method in spring.net, but i'm having trouble getting the configuration right. Method: public void AddRepository(IRepository repository) where TEntity : IEntity { Repositories.Add(repository.GetType().Name, repository); } Config: <object type="Spring.Objects.Factory.Config.MethodInvokingFactoryObject, Spring.Core"> <property name="TargetObject"> <ref local="RepositoryFactory" /> </property> <property name="TargetMethod" value="AddRepository"/> <property name="Arguments"> <list> <ref object="BinaryAssetFileRepository"/> </list> </property> </object>" Is it possible to address generic methods in this way? Thx, Bert

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  • Silverlight 4 accessing WCF Data Services: BeginInvoke frustrations.

    - by Gatmando
    Hi, I'm attempting to follow a pattern for performing WCF data service queries using the Silverlight 4 beta. The following is my code: public CodeTables() { CodeCountries = new ObservableCollection<dsRealHomes.CodeCountries>(); dsRealHomes.RealHomesEntities myClient = null; myClient = staticGlobals.RealHomesContext(); object userState = null; myClient.BeginExecute<dsRealHomes.CodeCountries>(new Uri("CodeCountries"), (IAsyncResult asyncResult) => { Dispatcher.BeginInvoke( () => { var test = myClient.EndExecute<dsRealHomes.CodeCountries>asyncResult).ToList(); } ); }, userState); } This is derived from a number of examples I've come across for WCF data services with silverlight. Unfortunately no matter how I try to implement the code i end up with the following error on 'Dispatcher.BeginInvoke': 'An object reference is required for the non-static field, method, or property (System.Windows.Threading.Dispatcher.BeginInvoke(System.Action)' Thanks

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  • Counting number of children in hierarchical SQL data

    - by moontear
    Hello, for a simple data structure such as so: ID parentID Text Price 1 Root 2 1 Flowers 3 1 Electro 4 2 Rose 10 5 2 Violet 5 6 4 Red Rose 12 7 3 Television 100 8 3 Radio 70 9 8 Webradio 90 For reference, the hierarchy tree looks like this: ID Text Price 1 Root |2 Flowers |-4 Rose 10 | |-6 Red Rose 12 |-5 Violet 5 |3 Electro |-7 Television 100 |-8 Radio 70 |-9 Webradio 90 I'd like to count the number of children per level. So I would get a new column "NoOfChildren" like so: ID parentID Text Price NoOfChildren 1 Root 8 2 1 Flowers 3 3 1 Electro 3 4 2 Rose 10 1 5 2 Violet 5 0 6 4 Red Rose 12 0 7 3 Television 100 0 8 3 Radio 70 1 9 8 Webradio 90 0 I read a few things about hierarchical data, but I somehow get stuck on the multiple inner joins on the parentIDs. Maybe someone could help me out here. moon

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  • Error in retrieving data from Excel File

    - by Sreejesh Kumar
    I have an excel file. I wanted to pull the data from excel file to SQL Server table. And the data is successfully transferred.In the excel file, I removed a text from one column named "Risk" from one row.The text was lengthy one.now the package execution fails at the source ie from the excel file. The errors are shown as "[Audit [1]] Error: There was an error with output column "Risk" (100) on output "Excel Source Output" (9). The column status returned was: "DBSTATUS_UNAVAILABLE"." and "[Audit [1]] Error: SSIS Error Code DTS_E_INDUCEDTRANSFORMFAILUREONERROR. The "output column "Risk" (100)" failed because error code 0xC0209071 occurred, and the error row disposition on "output column "Risk" (100)" specifies failure on error. An error occurred on the specified object of the specified component. There may be error messages posted before this with more information about the failure." the error occurs only when I remove this particular text from this row.

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  • Core Data Relationship List

    - by Dylan Copeland
    I'm not sure whether or not this is the appropriate way of doing this, but I was wondering what's the best way to approach a relationship to a value in a list with Core Data? For example, say you have a 'person' entity. Each person can have a different 'hair color'. I'm trying to basically define the hair colors in my data model and allow the 'person' entity to have a relationship to their given 'hair color. Is this possible? Good idea or bad? Thanks in advance.

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  • Core Data multi-threading

    - by JK
    My app starts by presenting a tableview whose datasource is a Core Data SQLite store. When the app starts, a secondary thread with its own store controller and context is created to obtain updates from the web for data in the store. However, any resulting changes to the store are not notified to the fetchedresults controller (I presume because it has its own coordinator) and consequently the table is not updated with store changes. What would be the most efficient way to refresh the context on the main thread? I am considering tracking the objectIDs of any objects changed on the secondary thread, sending those to the main thread when the secondary thread completes and invoking "[context refreshObject:....] Any help would be greatly appreciated.

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  • Custom validator not invoked when using Validation Application Block through configuration

    - by Chris
    I have set up a ruleset in my configuration file which has two validators, one of which is a built-in NotNullValidator, the other of which is a custom validator. The problem is that I see the NotNullValidator hit, but not my custom validator. The custom validator is being used to validate an Entity Framework entity object. I have used the debugger to confirm the NotNull is hit (I forced a failure condition so I saw it set an invalid result), but it never steps into the custom one. I am using MVC as the web app, so I defined the ruleset in a config file at that layer, but my custom validator is defined in another project. However, I wouldn't have thought that to be a problem because when I use the Enterprise Library Configuration tool inside Visual Studio 2008 it is able to set the type properly for the custom validator. As well, I believe the custom validator is fine as it builds ok, and the config tool can reference it properly. Does anybody have any ideas what the problem could be, or even what to do/try to debug further? Here is a stripped down version of my custom validator: [ConfigurationElementType(typeof(CustomValidatorData))] public sealed class UserAccountValidator : Validator { public UserAccountValidator(NameValueCollection attributes) : base(string.Empty, "User Account") { } protected override string DefaultMessageTemplate { get { throw new NotImplementedException(); } } protected override void DoValidate(object objectToValidate, object currentTarget, string key, ValidationResults results) { if (!currentTarget.GetType().Equals(typeof(UserAccount))) { throw new Exception(); } UserAccount userAccountToValidate = (UserAccount)currentTarget; // snipped code ... this.LogValidationResult(results, "The User Account is invalid", currentTarget, key); } } Here is the XML of my ruleset in Validation.config (the NotNull rule is only there to force a failure so I could see it getting hit, and it does): <validation> <type defaultRuleset="default" assemblyName="MyProj.Entities, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" name="MyProj.Entities.UserAccount"> <ruleset name="default"> <properties> <property name="HashedPassword"> <validator negated="true" messageTemplate="" messageTemplateResourceName="" messageTemplateResourceType="" tag="" type="Microsoft.Practices.EnterpriseLibrary.Validation.Validators.NotNullValidator, Microsoft.Practices.EnterpriseLibrary.Validation, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" name="Not Null Validator" /> </property> <property name="Property"> <validator messageTemplate="" messageTemplateResourceName="" messageTemplateResourceType="" tag="" type="MyProj.Entities.UserAccountValidator, MyProj.Entities, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" name="Custom Validator" /> </property> </properties> </ruleset> </type> </validation> And here is the stripped down version of the way I invoke the validation: var type = entity.GetType() var validator = ValidationFactory.CreateValidator(type, "default", new FileConfigurationSource("Validation.config")) var results = validator.Validate(entity) Any advice would be much appreciated! Thanks, Chris

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  • Core data many-to-many relationship - Predicate question

    - by Garry
    In my Core Data model I have two entities: List and Patient. List has an attribute called 'name'. A List can have any number of Patients and each Patient can belong to any number of different lists. I have therefore set a relationship on List called 'patients' that has an inverse to-many relationship to Patient AND a relationship on Patient called 'lists' that has a to-many relationship to List. What I'm struggling to figure out is how to create a Predicate that will select all Patients that belong to a particular List name. How would I go about this? I have never used relationships before in Core Data. Thanks,

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  • Expanding all items of a NSOutlineView that loads data from a data source

    - by matei
    First of all I'm new to cocoa development so I suppose I'm probably trying to do this the wrong way, but here goes: I have a NSOutlineView which loads the data from a NSOutlineViewDataSource imnplementation. I want all the items to be expanded after they are loaded, but i can't seem to find an event fired when the data has finished loading, so I can send a [outlineView expandItem:nil expandChildren: YES] to it. I looked into the NSOutlineViewDelegate protocol but I was unable to find a sutable place for this call. What would be the best approach for this problem ?

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  • Need suggestion for implementing Message alert in Client server application

    - by sandip-mcp
    My requrement is like, i have to display message alert like if you sign in yahoo messanger and once u got any message a alert box will display corner of the page.Like wise when i sign in my website and if anybody send me any message then message will store in database and symultaneously a alert should display in my site. I am using .net framework3.5 using wcf service.So i will appreciate ur suggestion.Thanks in advance

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  • Adding unique objects to Core Data

    - by absolut
    I'm working on an iPhone app that gets a number of objects from a database. I'd like to store these using Core Data, but I'm having problems with my relationships. A Detail contains any number of POIs (points of interest). When I fetch a set of POI's from the server, they contain a detail ID. In order to associate the POI with the Detail (by ID), my process is as follows: Query the ManagedObjectContext for the detailID. If that detail exists, add the poi to it. If it doesn't, create the detail (it has other properties that will be populated lazily). The problem with this is performance. Performing constant queries to Core Data is slow, to the point where adding a list of 150 POI's takes a minute thanks to the multiple relationships involved. In my old model, before Core Data (various NSDictionary cache objects) this process was super fast (look up a key in a dictionary, then create it if it doesn't exist) I have more relationships than just this one, but pretty much every one has to do this check (some are many to many, and they have a real problem). Does anyone have any suggestions for how I can help this? I could perform fewer queries (by searching for a number of different ID's), but I'm not sure how much this will help. Some code: POI *poi = [NSEntityDescription insertNewObjectForEntityForName:@"POI" inManagedObjectContext:[(AppDelegate*)[UIApplication sharedApplication].delegate managedObjectContext]]; poi.POIid = [attributeDict objectForKey:kAttributeID]; poi.detailId = [attributeDict objectForKey:kAttributeDetailID]; Detail *detail = [self findDetailForID:poi.POIid]; if(detail == nil) { detail = [NSEntityDescription insertNewObjectForEntityForName:@"Detail" inManagedObjectContext:[(AppDelegate*)[UIApplication sharedApplication].delegate managedObjectContext]]; detail.title = poi.POIid; detail.subtitle = @""; detail.detailType = [attributeDict objectForKey:kAttributeType]; } -(Detail*)findDetailForID:(NSString*)detailID { NSManagedObjectContext *moc = [[UIApplication sharedApplication].delegate managedObjectContext]; NSEntityDescription *entityDescription = [NSEntityDescription entityForName:@"Detail" inManagedObjectContext:moc]; NSFetchRequest *request = [[[NSFetchRequest alloc] init] autorelease]; [request setEntity:entityDescription]; NSPredicate *predicate = [NSPredicate predicateWithFormat: @"detailid == %@", detailID]; [request setPredicate:predicate]; NSLog(@"%@", [predicate description]); NSError *error; NSArray *array = [moc executeFetchRequest:request error:&error]; if (array == nil || [array count] != 1) { // Deal with error... return nil; } return [array objectAtIndex:0]; }

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  • Vietnamese character in .NET Console Application (UTF-8)

    - by DucDigital
    Im trying to write down an UTF8 string (Vietnamese) into C# Console but no success. Im running on windows 7. I tried to use the Encoding class that convert string to char[] to byte[] and then to String, but no help, the string is input directly fron the database. Here is some example Tôi tên là Ð?c, cu?c s?ng th?t vui v? tuy?t v?i It does not show the special character like : Ð or ?... instead it show up ?, much worse with the Encoding class. Does anyone can try this out or know about this problem? Thank you My code static void Main(string[] args) { XDataContext _new = new XDataContext(); Console.OutputEncoding = Encoding.GetEncoding("UTF-8"); string srcString = _new.Posts.First().TITLE; Console.WriteLine(srcString); // Convert the UTF-16 encoded source string to UTF-8 and ASCII. byte[] utf8String = Encoding.UTF8.GetBytes(srcString); byte[] asciiString = Encoding.ASCII.GetBytes(srcString); // Write the UTF-8 and ASCII encoded byte arrays. Console.WriteLine("UTF-8 Bytes: {0}", BitConverter.ToString(utf8String)); Console.WriteLine("ASCII Bytes: {0}", BitConverter.ToString(asciiString)); // Convert UTF-8 and ASCII encoded bytes back to UTF-16 encoded // string and write. Console.WriteLine("UTF-8 Text : {0}", Encoding.UTF8.GetString(utf8String)); Console.WriteLine("ASCII Text : {0}", Encoding.ASCII.GetString(asciiString)); Console.WriteLine(Encoding.UTF8.GetString(utf8String)); Console.WriteLine(Encoding.ASCII.GetString(asciiString)); } and here is the outstanding output Nhà báo Ä‘i há»™i báo Xuân UTF-8 Bytes: 4E-68-C3-A0-20-62-C3-A1-6F-20-C4-91-69-20-68-E1-BB-99-69-20-62-C3- A1-6F-20-58-75-C3-A2-6E ASCII Bytes: 4E-68-3F-20-62-3F-6F-20-3F-69-20-68-3F-69-20-62-3F-6F-20-58-75-3F- 6E UTF-8 Text : Nhà báo Ä‘i há»™i báo Xuân ASCII Text : Nh? b?o ?i h?i b?o Xu?n Nhà báo Ä‘i há»™i báo Xuân Nh? b?o ?i h?i b?o Xu?n Press any key to continue . . .

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  • one high-end server with one Application Server or multiple Application Servers?

    - by elgcom
    If I have a high-end server, for example with 1T memory and 8x4core CPU... will it bring more performance if I run multiple App Server (on different JVM) rather than just one App Server? On App Server I will run some services (EAR whith message driven beans) which exchange message with each other. btw, has java 64bit now no memory limitation any more? http://java.sun.com/products/hotspot/whitepaper.html#64

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  • data structure problems

    - by Ashish
    hey guys, please help me in finding the solution to some of these Amazon questions: given a file containing approx 10 million words, design a data structure for finding the anagrams Write a program to display the ten most frequent words in a file such that your program be efficient in all complexity measures. you have a file with millions of lines of data. Only two lines are identical; the rest are all unique. Each line is so long that it may not even fit in the memory. What is the most efficient solution for finding the identical lines?

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  • Free data warehouse - Infobright, Hadoop/Hive or what ?

    - by peperg
    I need to store large amount of small data objects (millions of rows per month). Once they're saved they wont change. I need to : store them securely use them to analysis (mostly time-oriented) retrieve some raw data occasionally It would be nice if it could be used with JasperReports or BIRT My first shot was Infobright Community - just a column-oriented, read-only storing mechanism for MySQL On the other hand, people says that NoSQL approach could be better. Hadoop+Hive looks promissing, but the documentation looks poor and the version number is less than 1.0 . I heard about Hypertable, Pentaho, MongoDB .... Do you have any recommendations ? (Yes, I found some topics here, but it was year or two ago)

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