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  • Which is more flexible in regards to database changes, EF 4 or Linq to SQL

    - by JBeckton
    Reading about both Linq to SQL and Entity Framework I have developed the impression that EF is more suitable for apps that get data from multiple data sources. But as I am reading about MVC2 models I see an example where EF is more loosely coupled with your data model. If I have to add or remove some columns from a table then what is involved in updating my model or DAL with each of these implementations?

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  • Upgrading From EF 4x to 6 breaks everything

    - by dan h
    Attempted to upgrade my project from EF4 to EF6, I get build errors It appears that if i swap out the namespaces manually to include the entity.core it works, but if i change the .edmx file at all, the code reverts back to the old references and i have to manually edit the code generation files to include the update namespace references. I have attempted to "add code generation item" that does not resolve the issue at all. When i open the .edmx file in the IDE it shows me everything correctly.

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  • XML allows for external entities; what about XHTML?

    - by xtofl
    This question about web page 'inclusion' triggered my curiosity. The XML allows you to specify a reference to an 'external' portion. Can you do the same in XHTML, then? XML example: <!ENTITY foo SYSTEM "http://www.mydomain.com/logo.gif" NDATA GIF87A> ... <SOMETHING>&foo;</SOMETHING>

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  • How do I verify my EF4 Code-Only mappings?

    - by Tomas Lycken
    In NHibernate, there is a method doing something like ThisOrThat.VeryfyMappings() (I don't know the exact definition of it since it was a while ago I last tried NHibernate...) I recall seeing a blog post somewhere where the author showed how to do some similar testing in Entity Framework 4, but now I cant find it. So, how do I test my EF4 Code-Only mappings?

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  • 'Subquery returned more than 1 value' problem in EntityFramework

    - by plotnick
    I have one 'Transaction' entity object with 'Operations' navproperty with multiplicity of 'Many'. When I'm adding only one operation per transaction nothing happens, but when I'm trying to add more than one operation, db.SaveChanges() throws an exception like 'Subquery returned more than 1 value blah, blah, blah' How can I solve that? Help me guys please... BTW... Could you tell me how can I see the exact query string that EF passes to Sql Server on db.SaveChanges() method?

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  • Is there a solution for SugarCRM that can map roles or privileges to Active Directory groups?

    - by Cory Larson
    We're presenting SugarCRM as an option to one of our clients, but they want to drive permissions within Sugar by users' AD groups. Current LDAP integration with SugarCRM only does password management. Does anybody know of a plug-in that supports this? I've searched and have not been able to find anything. Has anybody change the LDAP module code within Sugar to accommodate these features? I'd be interested in chatting with you. I apologize if this isn't on the correct site; neither serverfault nor stackoverflow seemed like the correct place. Perhaps webapps? Thanks!

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  • Is there a solution for SugarCRM that can map roles or privileges to Active Directory groups?

    - by Cory Larson
    We're presenting SugarCRM as an option to one of our clients, but they want to drive permissions within Sugar by users' AD groups. Current LDAP integration with SugarCRM only does password management. Does anybody know of a plug-in that supports this? I've searched and have not been able to find anything. Has anybody change the LDAP module code within Sugar to accommodate these features? I'd be interested in chatting with you. I apologize if this isn't on the correct site; neither serverfault nor stackoverflow seemed like the correct place. Perhaps webapps? Thanks!

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  • How to overcome shortcomings in reporting from EAV database?

    - by David Archer
    The major shortcomings with Entity-Attribute-Value database designs in SQL all seem to be related to being able to query and report on the data efficiently and quickly. Most of the information I read on the subject warn against implementing EAV due to these problems and the commonality of querying/reporting for almost all applications. I am currently designing a system where almost all the fields necessary for data storage are not known at design/compile time and are defined by the end-user of the system. EAV seems like a good fit for this requirement but due to the problems I've read about, I am hesitant in implementing it as there are also some pretty heavy reporting requirements for this system as well. I think I've come up with a way around this but would like to pose the question to the SO community. Given that typical normalized database (OLTP) still isn't always the best option for running reports, a good practice seems to be having a "reporting" database (OLAP) where the data from the normalized database is copied to, indexed extensively, and possibly denormalized for easier querying. Could the same idea be used to work around the shortcomings of an EAV design? The main downside I see are the increased complexity of transferring the data from the EAV database to reporting as you may end up having to alter the tables in the reporting database as new fields are defined in the EAV database. But that is hardly impossible and seems to be an acceptable tradeoff for the increased flexibility given by the EAV design. This downside also exists if I use a non-SQL data store (i.e. CouchDB or similar) for the main data storage since all the standard reporting tools are expecting a SQL backend to query against. Do the issues with EAV systems mostly go away if you have a seperate reporting database for querying? EDIT: Thanks for the comments so far. One of the important things about the system I'm working on it that I'm really only talking about using EAV for one of the entities, not everything in the system. The whole gist of the system is to be able to pull data from multiple disparate sources that are not known ahead of time and crunch the data to come up with some "best known" data about a particular entity. So every "field" I'm dealing with is multi-valued and I'm also required to track history for each. The normalized design for this ends up being 1 table per field which makes querying it kind of painful anyway. Here are the table schemas and sample data I'm looking at (obviously changed from what I'm working on but I think it illustrates the point well): EAV Tables Person ------------------- - Id - Name - ------------------- - 123 - Joe Smith - ------------------- Person_Value ------------------------------------------------------------------- - PersonId - Source - Field - Value - EffectiveDate - ------------------------------------------------------------------- - 123 - CIA - HomeAddress - 123 Cherry Ln - 2010-03-26 - - 123 - DMV - HomeAddress - 561 Stoney Rd - 2010-02-15 - - 123 - FBI - HomeAddress - 676 Lancas Dr - 2010-03-01 - ------------------------------------------------------------------- Reporting Table Person_Denormalized ---------------------------------------------------------------------------------------- - Id - Name - HomeAddress - HomeAddress_Confidence - HomeAddress_EffectiveDate - ---------------------------------------------------------------------------------------- - 123 - Joe Smith - 123 Cherry Ln - 0.713 - 2010-03-26 - ---------------------------------------------------------------------------------------- Normalized Design Person ------------------- - Id - Name - ------------------- - 123 - Joe Smith - ------------------- Person_HomeAddress ------------------------------------------------------ - PersonId - Source - Value - Effective Date - ------------------------------------------------------ - 123 - CIA - 123 Cherry Ln - 2010-03-26 - - 123 - DMV - 561 Stoney Rd - 2010-02-15 - - 123 - FBI - 676 Lancas Dr - 2010-03-01 - ------------------------------------------------------ The "Confidence" field here is generated using logic that cannot be expressed easily (if at all) using SQL so my most common operation besides inserting new values will be pulling ALL data about a person for all fields so I can generate the record for the reporting table. This is actually easier in the EAV model as I can do a single query. In the normalized design, I end up having to do 1 query per field to avoid a massive cartesian product from joining them all together.

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  • EF Code first + Delete Child Object from Parent?

    - by ebb
    I have a one-to-many relationship between my table Case and my other table CaseReplies. I'm using EF Code First and now wants to delete a CaseReply from a Case object, however it seems impossible to do such thing because it just tries to remove the CaseId from the specific CaseReply record and not the record itself.. short: Case just removes the relationship between itself and the CaseReply.. it does not delete the CaseReply. My code: // Case.cs (Case Object) public class Case { [Key] public int Id { get; set; } public string Topic { get; set; } public string Message { get; set; } public DateTime Date { get; set; } public Guid UserId { get; set; } public virtual User User { get; set; } public virtual ICollection<CaseReply> Replies { get; set; } } // CaseReply.cs (CaseReply Object) public class CaseReply { [Key] public int Id { get; set; } public string Message { get; set; } public DateTime Date { get; set; } public int CaseId { get; set; } public Guid UserId { get; set; } public virtual User User { get; set; } public virtual Case Case { get; set; } } // RepositoryBase.cs public class RepositoryBase<T> : IRepository<T> where T : class { public IDbContext Context { get; private set; } public IDbSet<T> ObjectSet { get; private set; } public RepositoryBase(IDbContext context) { Contract.Requires(context != null); Context = context; if (context != null) { ObjectSet = Context.CreateDbSet<T>(); if (ObjectSet == null) { throw new InvalidOperationException(); } } } public IRepository<T> Remove(T entity) { ObjectSet.Remove(entity); return this; } public IRepository<T> SaveChanges() { Context.SaveChanges(); return this; } } // CaseRepository.cs public class CaseRepository : RepositoryBase<Case>, ICaseRepository { public CaseRepository(IDbContext context) : base(context) { Contract.Requires(context != null); } public bool RemoveCaseReplyFromCase(int caseId, int caseReplyId) { Case caseToRemoveReplyFrom = ObjectSet.Include(x => x.Replies).FirstOrDefault(x => x.Id == caseId); var delete = caseToRemoveReplyFrom.Replies.FirstOrDefault(x => x.Id == caseReplyId); caseToRemoveReplyFrom.Replies.Remove(delete); return Context.SaveChanges() >= 1; } } Thanks in advance.

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  • The EntitySet name xxx could not be found.

    - by adamjellyit
    I create a simple table in SqlServer .. key field integer, 4 strings and a Timestamp This Table is called Event .. which pluralizes to Events.(the checkbox was ticked) I run the Entity Builder in VS2010 just adding this table only. EntityModelXXX x = new EntityModelXXX(); // create an object 'e' here x.AddToEvents(e); produces an error : The EntitySet name 'EntityModelXXX.Events' could not be found. It doesn't seem to find the set .. why?

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  • EF4, self tracking, repository pattern, SQL Server 2008 AND SQL Server Compact

    - by Darren
    Hi, I am creating a project using Entity Frameworks 4 and self tracking entities. I want to be able to either get the data from a sql server 2008 database or from sql server compact database (with the switch being in the config file). I am using the repository pattern and I will have the self tracking entities sitting in a separate assembly. Do I need two edmx files? If so, how do I generate only one set of STE's in the separate assembly? Also do I need to generate two context classes as well? I am unsure of the plumbing for all this. Can anyone help? Darren I forgot to add that the two databases will be identical and that the compact version is for offline usage.

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  • Compile error with Nested Classes

    - by ProfK
    I have metadata classes nested within entity classes, as I have always done, but suddenly, when I deploy to my target web site, and try and view a page, I get e.g. the following compile error: CS0102: The type 'PvmmsModel.ActivationResource' already contains a definition for 'ActivationResourceMetadata' My code for this type looks like below. There is only one definition of ActivationResourceMetadata: namespace PvmmsModel { [DisplayName("Activation Resources")] [DisplayColumn("Name")] [MetadataType(typeof(ActivationResourceMetadata))] public partial class ActivationResource { public class ActivationResourceMetadata { [ScaffoldColumn(false)] public object ResourceId { get; set; } [DisplayName("Cell Phone")] public object CellPhone { get; set; } [DisplayName("Shifts Worked or Planned")] public object ActivationShifts { get; set; } } } } This is on an ASP.NET WebSite project.

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  • SQL's Rownumber with Linq-to-entities

    - by mariki
    I am converting my project to use EF and also want to covert stored procedures into Linq-to-entities queries. This my SQL query (simple version) that I have trouble to convert: SELECT CategoryID, Title as CategoryTitle,Description, LastProductTitle,LastProductAddedDate FROM ( SELECT C.CategoryID, C.Title,C.Description, C.Section, P.Title as LastProductTitle, P.AddedDate as LastProductAddedDate, ROW_NUMBER() OVER (PARTITION BY P.CategoryID ORDER BY P.AddedDate DESC) AS Num FROM Categories C LEFT JOIN Products P ON P.CategoryID = C.CategoryID ) OuterSelect WHERE OuterSelect.Num = 1 In words: I want to return all Categories (from Categories table) and title and date of addition of the product (from Products table) that was added last to this category. How can I achieve this using Entity frame work query? In most efficient way.

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  • WPF DataGrid duplicates new row when new item is attached to the source collection.

    - by Shimmy
    <Page> <Page.Resources> <data:Quote x:Key="Quote"/> </Page.Resources> <tk:DataGrid DataContext="{Binding Quote}" ItemsSource="{Binding Rooms}"> <tk:DataGrid/> </Page> Code: Private Sub InitializingNewItem _ (sender As DataGrid, _ ByVal e As InitializingNewItemEventArgs) _ Handles dgRooms.InitializingNewItem Dim room = DirectCast(e.NewItem, Room) 'Room is subclass of EntityObject Dim state = room.EntityState 'Detached Dim quote = Resources("Quote") state = quote.EntityState 'Unchanged 'either one of these lines causes the new row to go duplicated: quote.Rooms.Add(room) room.Quote = quote 'I tried: sender.Items.Refresh 'I also tried to remove the detached entity from the DataGrid and create a 'new item but it they throw exceptions saying the the Items is untouchable. End If

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  • WCF Data Services implementation strategies.

    - by Nix
    Microsoft has done a savvy job of not outlining the actual place for data services in the wonderful world of SOA/Web dev. So my question is simple, are WCF Data Services designed to be used via clients? Or has anyone ever heard of someone using them on the server side? Simple scenario a general layered architecture using BO business objects (parenthesis indicate what is being passed between layers) (XML) WCF Service - (BO)Business Logic - (BO) Dao - Entity Framework or using data services it would be where DS BO are modeled business entities to be used in data service. (XML) WCF Service -(BO) Business Logic - (BO) WCF Data Service - (DS BO)Server I can't see a use for the later, unless there are going to be a lot of cases people would be accessing your data via your Data Service Layer vs the Service layer? Thoughts anyone? I have not seen any mention of using DS from within a Service Layer....

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  • L2E many to many query

    - by 5YrsLaterDBA
    I have four tables: Users PrivilegeGroups rdPrivileges LinkPrivilege ----------- ---------------- --------------- --------------- userId(pk) privilegeGroupId(pk) privilegeId(pk) privilegeId(pk, fk) privilegeGroupId(fk) name code privilegeGroupId(pk, fk) L2E will not create LinkPrivilege entity for me. So we only have Users, PrivilegeGroups and rdPrivileges entities. PrivilegeGroups and rdPrivileges are many to many relationship. What I need to do is retrieve all code from rdPrivileges table based on a passed in userId. How can I do it? EDIT working code: var acc = from u in db.Users from pg in db.PrivilegeGroups from p in pg.rdPrivileges where u.UserId == userId && u.PrivilegeGroups.PrivilegeGroupId == pg.PrivilegeGroupId select p.Code;

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  • How to avoid "The name 'ConfigurationManager' does not exist in the current context" error?

    - by 5YrsLaterDBA
    I am using VS2008. I have a project connect with a database and the connection string is read from App.config via ConfigurationManager. We are using L2E. Now I added a helper project, AndeDataViewer, to have a simple UI to display data from the database for testing/verification purpose. I don't want to create another set of Entity Data Model in the helper project. I just added all related files as a link in the new helper project. When I compile, I got the following error: Error 15 The name 'ConfigurationManager' does not exist in the current context C:\workspace\SystemSoftware\SystemSoftware\src\systeminfo\RuntimeInfo.cs 24 40 AndeDataViewer I think I may need to add another project setting/config related file's link to the helper project from the main project? There is no App.config file in the new helper project. But it looks I cannot add that file's link to the helper project. Any ideas?

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  • EntityFramework EntityState and databinding along with INotifyPropertyChanged

    - by OffApps Cory
    Hello, all! I have a WPF view that displays a Shipment entity. I have a textblock that contains an asterisk which will alert a user that the record is changed but unsaved. I originally hoped to bind the visibility of this (with converter) to the Shipment.EntityState property. If value = EntityState.Modified Then Return Visibility.Visible Else Return Visibility.Collapsed End If The property gets updated just fine, but the view is ignorant of the change. What I need to know is, how can I get the UI to receive notification of the property change. If this cannot be done, is there a good way of writing my own IsDirty property that handles editing retractions (i.e. if I change the value of a property, then change it back to it's original it does not get counted as an edit, and state remains Unchanged). Any help, as always, will be greatly appreciated. Cory

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  • EF 4.0 - Many to Many relationship - problem with deletes

    - by chugh97
    My Entity Model is as follows: Person , Store and PersonStores Many-to-many child table to store PeronId,StoreId When I get a person as in the code below, and try to delete all the StoreLocations, it deletes them from PersonStores as mentioned but also deletes it from the Store Table which is undesirable. Also if I have another person who has the same store Id, then it fails saying "The DELETE statement conflicted with the REFERENCE constraint \"FK_PersonStores_StoreLocations\". The conflict occurred in database \"EFMapping2\", table \"dbo.PersonStores\", column 'StoreId'.\r\nThe statement has been terminated" as it was trying to delete the StoreId but that StoreId was used for another PeronId and hence exception thrown. Person p = null; using (ClassLibrary1.Entities context = new ClassLibrary1.Entities()) { p = context.People.Where(x=> x.PersonId == 11).FirstOrDefault(); List<StoreLocation> locations = p.StoreLocations.ToList(); foreach (var item in locations) { context.Attach(item); context.DeleteObject(item); context.SaveChanges(); } }

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