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  • Ninject.ActivationException: Error activating IMainLicense

    - by Stefan Karlsson
    Im don't know fully how Ninject works thats wye i ask this question here to figure out whats wrong. If i create a empty constructor in ClaimsSecurityService it gets hit. This is my error: Error activating IMainLicense No matching bindings are available, and the type is not self-bindable. Activation path: 3) Injection of dependency IMainLicense into parameter mainLicenses of constructor of type ClaimsSecurityService 2) Injection of dependency ISecurityService into parameter securityService of constructor of type AccountController 1) Request for AccountController Stack: Ninject.KernelBase.Resolve(IRequest request) +474 Ninject.Planning.Targets.Target`1.GetValue(Type service, IContext parent) +153 Ninject.Planning.Targets.Target`1.ResolveWithin(IContext parent) +747 Ninject.Activation.Providers.StandardProvider.GetValue(IContext context, ITarget target) +269 Ninject.Activation.Providers.<>c__DisplayClass4.<Create>b__2(ITarget target) +69 System.Linq.WhereSelectArrayIterator`2.MoveNext() +66 System.Linq.Buffer`1..ctor(IEnumerable`1 source) +216 System.Linq.Enumerable.ToArray(IEnumerable`1 source) +77 Ninject.Activation.Providers.StandardProvider.Create(IContext context) +847 Ninject.Activation.Context.ResolveInternal(Object scope) +218 Ninject.Activation.Context.Resolve() +277 Ninject.<>c__DisplayClass15.<Resolve>b__f(IBinding binding) +86 System.Linq.WhereSelectEnumerableIterator`2.MoveNext() +145 System.Linq.Enumerable.SingleOrDefault(IEnumerable`1 source) +4059897 Ninject.Planning.Targets.Target`1.GetValue(Type service, IContext parent) +169 Ninject.Planning.Targets.Target`1.ResolveWithin(IContext parent) +747 Ninject.Activation.Providers.StandardProvider.GetValue(IContext context, ITarget target) +269 Ninject.Activation.Providers.<>c__DisplayClass4.<Create>b__2(ITarget target) +69 System.Linq.WhereSelectArrayIterator`2.MoveNext() +66 System.Linq.Buffer`1..ctor(IEnumerable`1 source) +216 System.Linq.Enumerable.ToArray(IEnumerable`1 source) +77 Ninject.Activation.Providers.StandardProvider.Create(IContext context) +847 Ninject.Activation.Context.ResolveInternal(Object scope) +218 Ninject.Activation.Context.Resolve() +277 Ninject.<>c__DisplayClass15.<Resolve>b__f(IBinding binding) +86 System.Linq.WhereSelectEnumerableIterator`2.MoveNext() +145 System.Linq.Enumerable.SingleOrDefault(IEnumerable`1 source) +4059897 Ninject.Web.Mvc.NinjectDependencyResolver.GetService(Type serviceType) +145 System.Web.Mvc.DefaultControllerActivator.Create(RequestContext requestContext, Type controllerType) +87 [InvalidOperationException: An error occurred when trying to create a controller of type 'Successful.Struct.Web.Controllers.AccountController'. Make sure that the controller has a parameterless public constructor.] System.Web.Mvc.DefaultControllerActivator.Create(RequestContext requestContext, Type controllerType) +247 System.Web.Mvc.DefaultControllerFactory.GetControllerInstance(RequestContext requestContext, Type controllerType) +438 System.Web.Mvc.DefaultControllerFactory.CreateController(RequestContext requestContext, String controllerName) +257 System.Web.Mvc.MvcHandler.ProcessRequestInit(HttpContextBase httpContext, IController& controller, IControllerFactory& factory) +326 System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContextBase httpContext, AsyncCallback callback, Object state) +157 System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContext httpContext, AsyncCallback callback, Object state) +88 System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.BeginProcessRequest(HttpContext context, AsyncCallback cb, Object extraData) +50 System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +301 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155 Account controller: public class AccountController : Controller { private readonly ISecurityService _securityService; public AccountController(ISecurityService securityService) { _securityService = securityService; } // // GET: /Account/Login [AllowAnonymous] public ActionResult Login(string returnUrl) { ViewBag.ReturnUrl = returnUrl; return View(); } } NinjectWebCommon: using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.Http; using System.Web.Http.Dependencies; using Microsoft.Web.Infrastructure.DynamicModuleHelper; using Ninject; using Ninject.Extensions.Conventions; using Ninject.Parameters; using Ninject.Syntax; using Ninject.Web.Common; using Successful.Struct.Web; [assembly: WebActivator.PreApplicationStartMethod(typeof(NinjectWebCommon), "Start")] [assembly: WebActivator.ApplicationShutdownMethodAttribute(typeof(NinjectWebCommon), "Stop")] namespace Successful.Struct.Web { public static class NinjectWebCommon { private static readonly Bootstrapper Bootstrapper = new Bootstrapper(); /// <summary> /// Starts the application /// </summary> public static void Start() { DynamicModuleUtility.RegisterModule(typeof(OnePerRequestHttpModule)); DynamicModuleUtility.RegisterModule(typeof(NinjectHttpModule)); Bootstrapper.Initialize(CreateKernel); } /// <summary> /// Stops the application. /// </summary> public static void Stop() { Bootstrapper.ShutDown(); } /// <summary> /// Creates the kernel that will manage your application. /// </summary> /// <returns>The created kernel.</returns> private static IKernel CreateKernel() { var kernel = new StandardKernel(); kernel.Bind<Func<IKernel>>().ToMethod(ctx => () => new Bootstrapper().Kernel); kernel.Bind<IHttpModule>().To<HttpApplicationInitializationHttpModule>(); kernel.Load("Successful*.dll"); kernel.Bind(x => x.FromAssembliesMatching("Successful*.dll") .SelectAllClasses() .BindAllInterfaces() ); GlobalConfiguration.Configuration.DependencyResolver = new NinjectResolver(kernel); RegisterServices(kernel); return kernel; } /// <summary> /// Load your modules or register your services here! /// </summary> /// <param name="kernel">The kernel.</param> private static void RegisterServices(IKernel kernel) { } } public class NinjectResolver : NinjectScope, IDependencyResolver { private readonly IKernel _kernel; public NinjectResolver(IKernel kernel) : base(kernel) { _kernel = kernel; } public IDependencyScope BeginScope() { return new NinjectScope(_kernel.BeginBlock()); } } public class NinjectScope : IDependencyScope { protected IResolutionRoot ResolutionRoot; public NinjectScope(IResolutionRoot kernel) { ResolutionRoot = kernel; } public object GetService(Type serviceType) { var request = ResolutionRoot.CreateRequest(serviceType, null, new Parameter[0], true, true); return ResolutionRoot.Resolve(request).SingleOrDefault(); } public IEnumerable<object> GetServices(Type serviceType) { var request = ResolutionRoot.CreateRequest(serviceType, null, new Parameter[0], true, true); return ResolutionRoot.Resolve(request).ToList(); } public void Dispose() { var disposable = (IDisposable)ResolutionRoot; if (disposable != null) disposable.Dispose(); ResolutionRoot = null; } } } ClaimsSecurityService: public class ClaimsSecurityService : ISecurityService { private const string AscClaimsIdType = "http://schemas.microsoft.com/accesscontrolservice/2010/07/claims/identityprovider"; private const string SuccessfulStructWebNamespace = "Successful.Struct.Web"; private readonly IMainLicense _mainLicenses; private readonly ICompany _companys; private readonly IAuthTokenService _authService; [Inject] public IApplicationContext ApplicationContext { get; set; } [Inject] public ILogger<LocationService> Logger { get; set; } public ClaimsSecurityService(IMainLicense mainLicenses, ICompany companys, IAuthTokenService authService) { _mainLicenses = mainLicenses; _companys = companys; _authService = authService; } }

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  • Sharing an assembly between ASP.NET and Silverlight

    - by vtortola
    Hi, I've created an assembly to share it between my main app and the silverlight app. At the beginning it looked like it was going to work but now I get this exception: "System.IO.FileNotFoundException was caught, Message="Could not load file or assembly 'System.Xml.Linq". I'm using .NET 3.5 Sp1 and Silverlight 3. That shared assembly uses System.Xml.Linq, and it cannot find it... I think because it is trying to find that version in the .NET framework instead looking in the silverlight one. How can I fix this? Cheers. PS: this is the full exception output: System.IO.FileNotFoundException was caught Message="Could not load file or assembly 'System.Xml.Linq, Version=2.0.5.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified." Source="MyApp.Metadata" FileName="System.Xml.Linq, Version=2.0.5.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" FusionLog="=== Pre-bind state information ===\r\nLOG: User = IIS APPPOOL\DefaultAppPool\r\nLOG: DisplayName = System.Xml.Linq, Version=2.0.5.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35\n (Fully-specified)\r\nLOG: Appbase = file:///C:/Users/vtortola.MyApp/Documents/MyApp/MyAppSAS/WebApplication1/WebApplication1/\r\nLOG: Initial PrivatePath = C:\Users\vtortola.MyApp\Documents\MyApp\MyAppSAS\WebApplication1\WebApplication1\bin\r\nCalling assembly : MyApp.Metadata, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null.\r\n===\r\nLOG: This bind starts in default load context.\r\nLOG: Using application configuration file: C:\Users\vtortola.MyApp\Documents\MyApp\MyAppSAS\WebApplication1\WebApplication1\web.config\r\nLOG: Using host configuration file: C:\Windows\Microsoft.NET\Framework64\v2.0.50727\Aspnet.config\r\nLOG: Using machine configuration file from C:\Windows\Microsoft.NET\Framework64\v2.0.50727\config\machine.config.\r\nLOG: Post-policy reference: System.Xml.Linq, Version=2.0.5.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35\r\nLOG: The same bind was seen before, and was failed with hr = 0x80070002.\r\n" StackTrace: at MyApp.Metadata.MyAppEntity.Deserialize(String message)

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  • NHibernate - Retrieving Lots of Data Becomes Exponentially Slow

    - by nfplee
    Hi, I have an issue when I retrieve lots of data in NHibernate (such as when producing a report) the page becomes exponentially slower the more data it has to retrieve. I found the following article: http://nhforge.org/blogs/nhibernate/archive/2008/10/30/bulk-data-operations-with-nhibernate-s-stateless-sessions.aspx It explains how doing bulk data operations in NHibernate is slow since the first level cache grows too large and how you should use the IStatelessSession instead. The trouble I have is that I don't wish to tie my application to NHibernate so I've added a wrapper around ISession. I then use Linq as my query mechanism but IStatelessSession does not support Linq (it may do in NHibernate 3 but the Linq provider is not stable as it stands at the moment). I then read that you could do a clear after so many iterations to clear out the first level cache. The problem now is that you can't use lazy loading. The linq provider doesn't allow you to override the mapping defined (or eagerly fetch the additional data) so whenever I grab data which is lazy loaded after I have cleared the session an exception is thrown. I'm completely lost on what do now. I like the ease of producing reports with linq but the limitations of the inbuilt linq provider in NHibernate seem to be holding me back. I'd really appreciate it if someone could show me an alternative approach. Thanks

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  • Entity Framework - Single EMDX Mapping Multiple Database

    - by michaelalisonalviar
    Because of my recent craze on Entity Framework thanks to Sir Humprey, I have continuously searched the Internet for tutorials on how to apply it to our current system. So I've come to learn that with EF, I can eliminate the numerous coding of methods/functions for CRUD operations, my overly used assigning of connection strings, Data Adapters or Data Readers as Entity Framework will map my desired database and will do its magic to create entities for each table I want (using EF Powertool) and does all the methods/functions for my Crud Operations. But as I begin applying it to a new project I was assigned to, I realized our current server is designed to contain each similar entities in different databases. For example Our lookup tables are stored in LookupDb, Accounting-related tables are in AccountingDb, Sales-related tables in SalesDb. My dilemma is I have to use an existing table from LookupDB and use it as a look-up for my new table. Then I have found Miss Rachel's Blog (here)Thank You Miss Rachel!  which enables me to let EF think that my TableLookup1 is in the AccountingDB using the following steps. Im on VS 2010, I am using C# , Using Entity Framework 5, SQL Server 2008 as our DB ServerStep 1:Creating A SQL Synonym. If you want a more detailed discussion on synonyms, this was what i have read -> (link here). To simply put it, A synonym enabled me to simplify my query for the Look-up table when I'm using the AccountingDB fromSELECT [columns] FROM LookupDB.dbo.TableLookup1toSELECT [columns] FROM TableLookup1Syntax: CREATE SYNONYM  TableLookup1(1) FOR LookupDB.dbo.TableLookup1 (2)1. What you want to call the table on your other DB2. DataBaseName.schema.TableNameStep 2: We will now follow Miss Rachel's steps. you can either visit the link on the original topic I posted earlier or just follow the step I made.1. I created a Visual Basic Solution that will contain the 4 projects needed to complete the merging2. First project will contain the edmx file pointing to the AccountingDB3. Second project will contain the edmx file pointing to the LookupDB4. Third Project will will be our repository of the merged edmx file. Create an edmx file pointing To AccountingDB as this the database that we created the Synonym on.Reminder: Aside from using the same name for the Entities, please make sure that you have the same Model Namespace for all your Entities  5. Fourth project that will contain the beautiful EDMX merger that Miss Rachel created that will free you from Hard coding of the merge/recoding the Edmx File of the third project everytime a change is done on either one of the first two projects' Edmx File.6. Run the solution, but make sure that on the solutions properties Single startup project is selected and the project containing the EDMX merger is selected.7. After running the solution, double click on the EDMX file of the 3rd project and set Lazy Loading Enabled = False. This will let you use the tables/entities that you see in that EDMX File.8. Feel free to do your CRUD Operations.I don't know if EF 5 already has a feature to support synonyms as I am still a newbie on that aspect but I have seen a linked where there are supposed suggestions on Entity Framework upgrades and one is the "Support for multiple databases"  So that's it! Thanks for reading!

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  • How do you formulate the Domain Model in Domain Driven Design properly (Bounded Contexts, Domains)?

    - by lko
    Say you have a few applications which deal with a few different Core Domains. The examples are made up and it's hard to put a real example with meaningful data together (concisely). In Domain Driven Design (DDD) when you start looking at Bounded Contexts and Domains/Sub Domains, it says that a Bounded Context is a "phase" in a lifecycle. An example of Context here would be within an ecommerce system. Although you could model this as a single system, it would also warrant splitting into separate Contexts. Each of these areas within the application have their own Ubiquitous Language, their own Model, and a way to talk to other Bounded Contexts to obtain the information they need. The Core, Sub, and Generic Domains are the area of expertise and can be numerous in complex applications. Say there is a long process dealing with an Entity for example a Book in a core domain. Now looking at the Bounded Contexts there can be a number of phases in the books life-cycle. Say outline, creation, correction, publish, sale phases. Now imagine a second core domain, perhaps a store domain. The publisher has its own branch of stores to sell books. The store can have a number of Bounded Contexts (life-cycle phases) for example a "Stock" or "Inventory" context. In the first domain there is probably a Book database table with basically just an ID to track the different book Entities in the different life-cycles. Now suppose you have 10+ supporting domains e.g. Users, Catalogs, Inventory, .. (hard to think of relevant examples). For example a DomainModel for the Book Outline phase, the Creation phase, Correction phase, Publish phase, Sale phase. Then for the Store core domain it probably has a number of life-cycle phases. public class BookId : Entity { public long Id { get; set; } } In the creation phase (Bounded Context) the book could be a simple class. public class Book : BookId { public string Title { get; set; } public List<string> Chapters { get; set; } //... } Whereas in the publish phase (Bounded Context) it would have all the text, release date etc. public class Book : BookId { public DateTime ReleaseDate { get; set; } //... } The immediate benefit I can see in separating by "life-cycle phase" is that it's a great way to separate business logic so there aren't mammoth all-encompassing Entities nor Domain Services. A problem I have is figuring out how to concretely define the rules to the physical layout of the Domain Model. A. Does the Domain Model get "modeled" so there are as many bounded contexts (separate projects etc.) as there are life-cycle phases across the core domains in a complex application? Edit: Answer to A. Yes, according to the answer by Alexey Zimarev there should be an entire "Domain" for each bounded context. B. Is the Domain Model typically arranged by Bounded Contexts (or Domains, or both)? Edit: Answer to B. Each Bounded Context should have its own complete "Domain" (Service/Entities/VO's/Repositories) C. Does it mean there can easily be 10's of "segregated" Domain Models and multiple projects can use it (the Entities/Value Objects)? Edit: Answer to C. There is a complete "Domain" for each Bounded Context and the Domain Model (Entity/VO layer/project) isn't "used" by the other Bounded Contexts directly, only via chosen paths (i.e. via Domain Events). The part that I am trying to figure out is how the Domain Model is actually implemented once you start to figure out your Bounded Contexts and Core/Sub Domains, particularly in complex applications. The goal is to establish the definitions which can help to separate Entities between the Bounded Contexts and Domains.

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  • Which is the "best" data access framework/approach for C# and .NET?

    - by Frans
    (EDIT: I made it a community wiki as it is more suited to a collaborative format.) There are a plethora of ways to access SQL Server and other databases from .NET. All have their pros and cons and it will never be a simple question of which is "best" - the answer will always be "it depends". However, I am looking for a comparison at a high level of the different approaches and frameworks in the context of different levels of systems. For example, I would imagine that for a quick-and-dirty Web 2.0 application the answer would be very different from an in-house Enterprise-level CRUD application. I am aware that there are numerous questions on Stack Overflow dealing with subsets of this question, but I think it would be useful to try to build a summary comparison. I will endeavour to update the question with corrections and clarifications as we go. So far, this is my understanding at a high level - but I am sure it is wrong... I am primarily focusing on the Microsoft approaches to keep this focused. ADO.NET Entity Framework Database agnostic Good because it allows swapping backends in and out Bad because it can hit performance and database vendors are not too happy about it Seems to be MS's preferred route for the future Complicated to learn (though, see 267357) It is accessed through LINQ to Entities so provides ORM, thus allowing abstraction in your code LINQ to SQL Uncertain future (see Is LINQ to SQL truly dead?) Easy to learn (?) Only works with MS SQL Server See also Pros and cons of LINQ "Standard" ADO.NET No ORM No abstraction so you are back to "roll your own" and play with dynamically generated SQL Direct access, allows potentially better performance This ties in to the age-old debate of whether to focus on objects or relational data, to which the answer of course is "it depends on where the bulk of the work is" and since that is an unanswerable question hopefully we don't have to go in to that too much. IMHO, if your application is primarily manipulating large amounts of data, it does not make sense to abstract it too much into objects in the front-end code, you are better off using stored procedures and dynamic SQL to do as much of the work as possible on the back-end. Whereas, if you primarily have user interaction which causes database interaction at the level of tens or hundreds of rows then ORM makes complete sense. So, I guess my argument for good old-fashioned ADO.NET would be in the case where you manipulate and modify large datasets, in which case you will benefit from the direct access to the backend. Another case, of course, is where you have to access a legacy database that is already guarded by stored procedures. ASP.NET Data Source Controls Are these something altogether different or just a layer over standard ADO.NET? - Would you really use these if you had a DAL or if you implemented LINQ or Entities? NHibernate Seems to be a very powerful and powerful ORM? Open source Some other relevant links; NHibernate or LINQ to SQL Entity Framework vs LINQ to SQL

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  • Hibernate criteria query to match against all child collection elements

    - by Andrew Harrison
    Hi, This question is very similar to link text but the responses were minimal to that question. I have a parent class with a Set of child entities. The child entities are just a wrapper for a string and live in a different table to the parent entity. I want to have a criteria query that returns the parent entities when all the members of the set of child entities return true to a condition. This condition is matching against one of a list of strings. Here's where I am: Criteria c = criteria(); Criteria ands = c.createCriteria("ands"); Disjunction dis = Restrictions.disjunction(); for (String value : values) { dis.add(Restrictions.like("value", "%" + value + "%")); } ands.add(dis); return list(c); "ands" is the set of entities with a "value" field that is a string. "criteria()" creates a criteria for the parent class. "list()" just calls criteria.list(); This is just matching against any of the elements, rather than all. Hope this makes sense. Any help much appreciated.

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  • Making ehcache read-write for test code and read-only for production code

    - by Rick
    I would like to annotate many of my Hibernate entities that contain reference data and/or configuration data with @Cache(usage = CacheConcurrencyStrategy.READ_ONLY) However, my JUnit tests are setting up and tearing down some of this reference/configuration data using the Hibernate entities. Is there a recommended way of having entities be read-write during test setup and teardown but read-only for production code? Two of my immediate thoughts for non-ideal workarounds are: Using NONSTRICT_READ_WRITE, but I am not sure what the hidden downsides are. Creating subclassed entities in my test code to override the read-only cache annotation. Any recommendations on the cleanest way to handle this? (Note: Project uses maven.)

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  • Modifying ChangeSet in RIA Services

    - by Mohit
    Hi, I am using RIA Services Beta 2 with Linq2Sql and SL3. In my SL3, I have a datagrid where I can do some mappings of data (Updates, Inserts and Deletes). I override the Submit method when SubmitChanges() is called. In the submit method in the domain service, I do some validation. If a validation fails for a particular ChangeSetEntry in the ChangeSet, a ValidationErrors is added. Then I call the base.Submit(changeSet). So, if the changeset has 3 entities and one of the entities results in validation error, the other 2 entities are also rolled back. It looks like, RIA Services does an implicit transaction and hence it either submits all 3 or none even if 2 out of 3 does not have any validation error. Is there a way for the RIA service, to prevent rollback of the valid entities and only invalidate the ones that has validation failed. Inputs will be appreciated. Thanks Mohit

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  • Core Data iPhone how often should I call [managedObjectContext save:&error] when doing 50k record in

    - by jamone
    I will be doing an occiasional import from XML into core data. I have around 50k entities that will be added. My question is how often should I call [managedObjectContext save:&error]. For every new entity added, or every x entities, or just at the end of the 50k import? I currently am calling it for each entity and tried only doing it for around every 10k and import speed went up drastically but after the first 30k it would crash with: *** Terminating app due to uncaught exception 'NSGenericException', reason: '*** Collection <NSCFSet: 0x13e760> was mutated while being enumerated.' Before I spend too much time trying to diagnose what is going on there I figured I'd check if its ok to not call save on every entity? Is the # of entities before calling save limited by the amount of memory those entities are using?

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  • Fluent NHibernate caching with automapping

    - by md1337
    I'm trying to understand how to configure Fluent NHibernate to enable 2nd-level caching for queries, entities, etc... There is very little information online on how to do that. I see it can be achieved by manually mapping the entities but I don't want that. I want to be able to cache all entities and not address the classes individually. How can I do that? Thanks.

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  • Adding existing entity to navigation property of a different entity

    - by Shay Friedman
    I'm using EF4 and I'm running into a problem when I try to do something that looks quite trivial to me. I have two entities, let's call them A and B. These entities have a many-to-many association between them with a navigation property on A that contains a list of related B entities. What I want to do is to add existing B entities to a new A entity. When I try to do that, I get an exception: AcceptChanges cannot continue because the object's key values conflict with another object in the ObjectStateManager. Make sure that the key values are unique before calling AcceptChanges. Has anyone run into such a problem?

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  • WCF Translators

    - by chugh97
    Is there a better way in WCF werein we could avoid the translation betwee business entities and service entities, just to avoid the whole translator logic for complex entities.Any insight on this topic is welcome

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  • Fluent NHibernate automap a HasManyToMany using a generic type

    - by zulkamal
    I have a bunch of domain entities that can be keyword tagged (a Tag is also an entity.) I want to do a normal many-to-many (Tag - TagReview <- Review) table relationship but I don't want to have to create a new concrete relationship on both the Entity and Tag every single time I add a new entity. I was hoping to do a generic based Tag and do this: // Tag public class Tag<T> { public virtual int Id { get; private set; } public virtual string Name { get; set; } public virtual IList<T> Entities { get; set; } public Tag() { Entities = new List<T>(); } } // Review public class Review { public virtual string Id { get; private set; } public virtual string Title { get; set; } public virtual string Content { get; set; } public virtual IList<Tag<Review>> Tags { get; set; } public Review() { Tags = new List<Tag<Review>>(); } } Unfortunately I get an exception: ----> System.ArgumentException : Cannot create an instance of FluentNHibernate.Automapping.AutoMapping`1[Example.Entities.Tag`1[T]] because Type.ContainsGenericParameters is true. I anticipate there will be maybe 5-10 entities so mapping normally would be ok but is there a way to do something like this?

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  • Creating self-referential tables with polymorphism in SQLALchemy

    - by Jace
    I'm trying to create a db structure in which I have many types of content entities, of which one, a Comment, can be attached to any other. Consider the following: from datetime import datetime from sqlalchemy import create_engine from sqlalchemy import Column, ForeignKey from sqlalchemy import Unicode, Integer, DateTime from sqlalchemy.orm import relation, backref from sqlalchemy.ext.declarative import declarative_base Base = declarative_base() class Entity(Base): __tablename__ = 'entities' id = Column(Integer, primary_key=True) created_at = Column(DateTime, default=datetime.utcnow, nullable=False) edited_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow, nullable=False) type = Column(Unicode(20), nullable=False) __mapper_args__ = {'polymorphic_on': type} # <...insert some models based on Entity...> class Comment(Entity): __tablename__ = 'comments' __mapper_args__ = {'polymorphic_identity': u'comment'} id = Column(None, ForeignKey('entities.id'), primary_key=True) _idref = relation(Entity, foreign_keys=id, primaryjoin=id == Entity.id) attached_to_id = Column(Integer, ForeignKey('entities.id'), nullable=False) #attached_to = relation(Entity, remote_side=[Entity.id]) attached_to = relation(Entity, foreign_keys=attached_to_id, primaryjoin=attached_to_id == Entity.id, backref=backref('comments', cascade="all, delete-orphan")) text = Column(Unicode(255), nullable=False) engine = create_engine('sqlite://', echo=True) Base.metadata.bind = engine Base.metadata.create_all(engine) This seems about right, except SQLAlchemy doesn't like having two foreign keys pointing to the same parent. It says ArgumentError: Can't determine join between 'entities' and 'comments'; tables have more than one foreign key constraint relationship between them. Please specify the 'onclause' of this join explicitly. How do I specify onclause?

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  • Turning a JSON list into a POJO

    - by Josh L
    I'm having trouble getting this bit of JSON into a POJO. I'm using Jackson configured like this: protected ThreadLocal<ObjectMapper> jparser = new ThreadLocal<ObjectMapper>(); public void receive(Object object) { try { if (object instanceof String && ((String)object).length() != 0) { ObjectDefinition t = null ; if (parserChoice==0) { if (jparser.get()==null) { jparser.set(new ObjectMapper()); } t = jparser.get().readValue((String)object, ObjectDefinition.class); } Object key = t.getKey(); if (key == null) return; transaction.put(key,t); } } catch (Exception e) { e.printStackTrace(); } } Here's the JSON that needs to be turned into a POJO: { "id":"exampleID1", "entities":{ "tags":[ { "text":"textexample1", "indices":[ 2, 14 ] }, { "text":"textexample2", "indices":[ 31, 36 ] }, { "text":"textexample3", "indices":[ 37, 43 ] } ] } And lastly, here's what I currently have for the java class: protected Entities entities; @JsonIgnoreProperties(ignoreUnknown = true) protected class Entities { public Entities() {} protected Tags tags; @JsonIgnoreProperties(ignoreUnknown = true) protected class Tags { public Tags() {} protected String text; public String getText() { return text; } public void setText(String text) { this.text = text; } }; public Tags getTags() { return tags; } public void setTags(Tags tags) { this.tags = tags; } }; //Getters & Setters ... I've been able to translate the more simple objects into a POJO, but the list has me stumped. Any help is appreciated. Thanks!

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  • flex/actionscript client entity state refresh on JPA update using Pimento EntityManager

    - by Chris
    My Flex application uses a client-side pimento EntityManager which fetches quite a few objects and associations. It does this by forcing eager fetching of particular association ends in the form of fetch plans. I would like to update the client whenever a change has been made to an entity existing in the EntityManager's cache. Is it possible to update the state of the changed entity ONLY, including updating which entities are associated, without resetting the state of these associated entities? I have setup an EntityListener with a JPA post-update method that notifies clients when a persisted entity has been updated. I want this to trigger a refresh for the modified client-side entity, but calling EntityManager.refresh(entity) resets all lazy associations to proxies. Initializing these proxies resets the associated entities, even if they were loaded previously. I'm looking for an efficient way to keep the client's state in synch with the server's state, at least with respect to the entities that have already been retrieved by the initial load.

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  • help with DOMDocument class in php

    - by noname
    here is my xml DOM. <entities> <entity id="7006276"> <title>xxx</title> <entities> <entity id="7877579"> <title>xxx</title> <entities> i want to get the 'entity' with id 7006276 so i could access its child 'entities' to create some 'entity' elements for it. i have tried: $xmlElementById = $this->DOMDocument_object->getElementById('7006276'); but it doesnt seem to work. any idea how i get it so i can create more 'entity' elements?

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  • Java OO design confusion: how to handle actions modified by states modified by actions...

    - by Arvanem
    Hi folks, Given an entity, whose action is potentially modified by states (of the entity and other entities) in turn potentially modified by other actions (of the entity and other entities) , what is the best way to code or design to handle the potential existence of the modifiers? Speaking metaphorically, I am coding a Java application representing a piano. As you know a piano has keys (which, when pressed, emit sound) and pedals (which, when pressed, modify the keys' sounds). My base class structure is as follows: Entity (for keys and pedals) State (this holds each entity's states, e.g. name such as "soft pedal", and boolean "Pressed"), Action (this holds each entity's actions, e.g. play sound when pressed, or modify others sounds). By composition, the Entity class has a copy of each of State and Action inside it. e.g.: public class Entity { State entityState = new State(); Action entityAction = new Action(); Thus I have coded a "C-Sharp" key Entity. When I "press" that entity (set its "Pressed" state to true), its action plays a "C-Sharp" sound and then sets its "Pressed" state to false. At the same time, if the "C-Sharp" key entity is not "tuned", its sound deviates from "C-Sharp". Meanwhile I have coded a "soft pedal" Entity. When that entity is "pressed", no sound plays but its action is to make softer the sound of the "C-Sharp" and other key entities. I have also coded a "sustain pedal" Entity. When that entity is "pressed", no sound plays but its action is to enable reverberation of the sound of the "C-Sharp" and other key entities. Both the "soft" and "sustain pedals" can be pressed at the same time with the result that keys entities become both softened and reverberating. In short, I do not understand how to make this simultaneous series of states and actions modify each other in a sensible OO way. I am wary of coding a massive series of "if" statements or "switches". Thanks in advance for any help or links you can offer.

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  • What's the best way to validate EntityFramwork 4.0 classes?

    - by lsb
    Hi! I've done a fair amount of searching but I've yet to find an easy way to validate EntityFramework 4.0 entities passed accross the wire via WCF Data Services. Basically, I want to do something on the client like: Proxy.MyEntities entities = new Proxy.MyEntities( new Uri("http://localhost:2679/Service.svc")); Proxy.Vendor vendor = new Proxy.Vendor(); vendor.Code = "ABC/XYZ"; vendor.Status = "ACTIVE"; // I'd like to do something like the following: vendor.Validate(); entities.AddToVendors(vendor); entities.SaveChanges(); Any help in this regard would be greatly appreciated!

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  • When to call Dispose in Entity Framework?

    - by Abdel Olakara
    Hi All, In my application I am making use of Spring.Net for IoC. The service objects are called from the ASP.Net files to perform CRUD operations using these service object. For example, I have CustomerService to do all CRUD operations on Customer table. I use entity framework and the entities are injected .. my question is where do I call the dispose method? As far as I understood from the API documentations, unless I call Dispose() there is no guaranty it will be garbage collected! So where and how do I do it? Example Service Class: public class CustomerService { public ecommEntities entities = {get; set;} public bool AddCustomer(Customer customer) { try { entities.AddToCustomer(customer); entities.SaveChanges(); return true; } catch (Exception e) { log.Error("Error occured during creation of new customer: " + e.Message + e.StackTrace); return false; } } public bool UpdateCustomer(Customer customer) { entities.SaveChanges(); return true; } public bool DeleteCustomer(Customer customer) . . . And I just create an object of CustomerService at the ASP partial class and call the necessary methods. Thanks in advance for the best practice and ideas.. Regards, Abdel Raoof

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  • Hibernate 3.5.0 causes extreme performance problems

    - by user303396
    I've recently updated from hibernate 3.3.1.GA to hibernate 3.5.0 and I'm having a lot of performance issues. As a test, I added around 8000 entities to my DB (which in turn cause other entities to be saved). These entities are saved in batches of 20 so that the transactions aren't too large for performance reasons. When using hibernate 3.3.1.GA all 8000 entities get saved in about 3 minutes. When using hibernate 3.5.0 it starts out slower than with hibernate 3.3.1. But it gets slower and slower. At around 4,000 entities, it sometimes takes 5 minutes just to save a batch of 20. If I then go to a mysql console and manually type in an insert statement from the mysql general query log, half of them run perfect in 0.00 seconds. And half of them take a long time (maybe 40 seconds) or timeout with "ERROR 1205 (HY000): Lock wait timeout exceeded; try restarting transaction" from MySQL. Has something changed in hibernate's transaction management in version 3.5.0 that I should be aware of? The ONLY thing I changed to experience these unusable performance issues is replace the following hibernate 3.3.1.GA jar files: com.springsource.org.hibernate-3.3.1.GA.jar, com.springsource.org.hibernate.annotations-3.4.0.GA.jar, com.springsource.org.hibernate.annotations.common-3.3.0.ga.jar, com.springsource.javassist-3.3.0.ga.jar with the new hibernate 3.5.0 release hibernate3.jar and javassist-3.9.0.GA.jar. Thanks.

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  • domain modeling naming problem

    - by cherouvim
    Hello There are some simple entities in an application (e.g containing only id and title) which rarely change and are being referenced by the more complex entities of the application. These are usually entities such as Country, City, Language etc. How are these called? I've used the following names for those in the past but I'm not sure which is the best way to call them: reference data lookup values dictionaries thanks

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  • Hibernate: how to maintain insertion order

    - by jwaddell
    I have a list of entities where creation order is important, but they do not contain a timestamp to use for sorting. Entities are added to the end of the list as they are created so they will be ordered correctly in the list itself. After persisting the list using Hibernate the entities appear in the database table in the order that they were created. However when retrieving the list using a new Hibernate session the list is now in reverse order of insertion/creation. Is this expected behaviour? Is there any way to retrieve the list in the same order as it appears in the table? The primary key is a UUID, and the list of entities should always have been created on the same IP address and JVM. This mean sorting by UUID is a possibility but I'd rather not make assumptions. Another possibility is if the list is guaranteed to always come out in reverse order I could always just work through it backwards.

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  • WCF data services (OData), query with inheritance limitation?

    - by Mathieu Hétu
    Project: WCF Data service using internally EF4 CTP5 Code-First approach. I configured entities with inheritance (TPH). See previous question on this topic: Previous question about multiple entities- same table The mapping works well, and unit test over EF4 confirms that queries runs smoothly. My entities looks like this: ContactBase (abstract) Customer (inherits from ContactBase), this entity has also several Navigation properties toward other entities Resource (inherits from ContactBase) I have configured a discriminator, so both Customer and Resource map to the same table. Again, everythings works fine on the Ef4 point of view (unit tests all greens!) However, when exposing this DBContext over WCF Data services, I get: - CustomerBases sets exposed (Customers and Resources sets seems hidden, is it by design?) - When I query over Odata on Customers, I get this error: Navigation Properties are not supported on derived entity types. Entity Set 'ContactBases' has a instance of type 'CodeFirstNamespace.Customer', which is an derived entity type and has navigation properties. Please remove all the navigation properties from type 'CodeFirstNamespace.Customer'. Stacktrace: at System.Data.Services.Serializers.SyndicationSerializer.WriteObjectProperties(IExpandedResult expanded, Object customObject, ResourceType resourceType, Uri absoluteUri, String relativeUri, SyndicationItem item, DictionaryContent content, EpmSourcePathSegment currentSourceRoot) at System.Data.Services.Serializers.SyndicationSerializer.WriteEntryElement(IExpandedResult expanded, Object element, ResourceType expectedType, Uri absoluteUri, String relativeUri, SyndicationItem target) at System.Data.Services.Serializers.SyndicationSerializer.<DeferredFeedItems>d__b.MoveNext() at System.ServiceModel.Syndication.Atom10FeedFormatter.WriteItems(XmlWriter writer, IEnumerable`1 items, Uri feedBaseUri) at System.ServiceModel.Syndication.Atom10FeedFormatter.WriteFeedTo(XmlWriter writer, SyndicationFeed feed, Boolean isSourceFeed) at System.ServiceModel.Syndication.Atom10FeedFormatter.WriteFeed(XmlWriter writer) at System.ServiceModel.Syndication.Atom10FeedFormatter.WriteTo(XmlWriter writer) at System.Data.Services.Serializers.SyndicationSerializer.WriteTopLevelElements(IExpandedResult expanded, IEnumerator elements, Boolean hasMoved) at System.Data.Services.Serializers.Serializer.WriteRequest(IEnumerator queryResults, Boolean hasMoved) at System.Data.Services.ResponseBodyWriter.Write(Stream stream) Seems like a limitation of WCF Data services... is it? Not much documentation can be found on the web about WCF Data services (OData) and inheritance specifications. How can I overpass this exception? I need these navigation properties on derived entities, and inheritance seems the only way to provide mapping of 2 entites on the same table with Ef4 CTP5... Any thoughts?

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