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• Entity Framework - SaveChanges with GUID as EntityKey

  - by MissingLinq

  I have a SQL Server 2008 database table that uses uniqueidentifier as a primary key. On inserts, the key is generated on the database side using the newid() function. This works fine with ADO.NET. But when I set up this table as an entity in an Entity Framework 4 model, there's a problem. I am able to query the entity just fine, but when creating a new entity and invoking SaveChanges() on the context, the generated uniqueidentifier on the database is all zeros. I understand there was an issue with EF v1 where this scenario did not work, requiring creating the GUID on the client prior to calling SaveChanges. However, I had read in many places that they were planning to fix this in EF 4. My question -- is this scenario (DB-side generation of uniqueidentifier) still not supported in EF4? Are we still stuck with generating the GUID on the client?

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• Entity Framework and consuming a WCF service

  - by nakori

  I'm getting data where the database is hidden behind a WCF service. Is it possible to use Entity Framework in a scenario where I have custom objects coming from a web service? (No access to the external database, and no current plans for insert/update/delete logic) Starting with an empty EF model and adding an entity I get this error on compile: No mapping specified for instances of the EntitySet and AssociationSet in the EntityContainer .. Is it possible to make an entity this way, and fill it with data received from an object? (In this case a WCF, but could also be a predefined model class/xml data) If the web service retured a Customer object I could do something like this with a dataset: Make an unbound table and do a loop through the customer properties adding them to a temp row, add it with tbl_Customer.Addtbl_CustomerRow(customerRow) to get my view filled. thanks, nakori

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• Entity Framework - Medium Trust

  - by Echilon

  I'm trying to get the entity framework working in medium trust. I've tried splitting the files and using a separate assembly but I seem to have one problem after another. I moved the EDMX to a separate assembly, which causes a single .dll to be outpit to the sites /Bin directory. I'm referencing this as below from web.config. Whenever I try to access one of the entity classes, I get an ArgumentException: 'An item with the same key has already been added.' It's critical this works with medium trust, but I seem to be running out of options. Any advice greatly appreciated.

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• Best Practices - Data Annotations vs OnChanging in Entity Framework 4

  - by jptacek

  I was wondering what the general recommendation is for Entity Framework in terms of data validation. I am relatively new to EF, but it appears there are two main approaches to data validation. The first is to create a partial class for the model, and then perform data validations and update a rule violation collection of some sort. This is outlined at http://msdn.microsoft.com/en-us/library/cc716747.aspx The other is to use data annotations and then have the annotations perform data validation. Scott Guthrie explains this on his blog at http://weblogs.asp.net/scottgu/archive/2010/01/15/asp-net-mvc-2-model-validation.aspx. I was wondering what the benefits are of one over the other. It seems the data annotations would be the preferred mechanism, especially as you move to RIA Services, but I want to ensure I am not missing something. Of course, nothing precludes using both of them together. Thanks John

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• Zend Framework: Undefined class constant 'MYSQL_ATTR_INIT_COMMAND'

  - by Awan

  As you may have known that I switched from ubuntu to windows from my previous questions. I was working on Zend Framework on ubuntu and now working on same project in windows. Because of this switching I facing some problems in windows which was not occurred in ubuntu. Now I have the following error in firebug console when I go to login page: <b>Fatal error</b>: Undefined class constant 'MYSQL_ATTR_INIT_COMMAND' in <b>C:\wamp\www\vcred\library\Zend\Db\Adapter\Pdo\Mysql.php</b> on line <b>93</b><br /> Do you people know that what type of error is this and what is the solution? I have the following configuration for database. resources.db.adapter = "Pdo_Mysql" resources.db.params.host = "localhost" resources.db.params.username = "root" resources.db.params.password = "" resources.db.params.dbname = "test" resources.db.params.charset = "utf8" Thanks

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• False Duplicate Key Error in Entity Framework Application

  - by ProfK

  I have an ASP.NET application using an entity framework model. In an import routine, with the code below, I get a "Cannot insert duplicate key" exception for AccountNum on the SaveChanges call, but when execution stops for the exception, I can query the database for the apparently duplicated field, and no prior record exists. using (var ents = new PvmmsEntities()) { foreach (DataRow row in importedResources.Rows) { var empCode = row["EmployeeCode"].ToString(); try { var resource = ents.ActivationResources.FirstOrDefault(rs => rs.EmployeeCode == empCode); if (resource == null) { resource = new ActivationResources(); resource.EmployeeCode = empCode; ents.AddToActivationResources(resource); } resource.AccountNum = row["AccountNum"].ToString(); ents.SaveChanges(true); } catch(Exception ex) { } } }

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• zend framework auto switch production staging test .. etc

  - by user284503

  What do I change to switch from production to staging.. etc.. and where.. Bootstrap ? Also, Curious if anyone has configured their Zend Framework to automatically switch from production, staging, test.. etc based on Host information.. example.. if (hostname = 'prodServer') ... blah if (hostname = 'testServer') ... blah I'm new to Zend but I typically configure my projects to automatically switch run environments based on the host information. thanks

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• Using DataAnnotations with Entity Framework

  - by dcompiled

  I have used the Entity Framework with VS2010 to create a simple person class with properties, firstName, lastName, and email. If I want to attach DataAnnotations like as is done in this blog post I have a small problem because my person class is dynamically generated. I could edit the dynamically generated code directly but any time I have to update my model all my validation code would get wiped out. First instinct was to create a partial class and try to attach annotations but it complains that I'm trying to redefine the property. I'm not sure if you can make property declarations in C# like function declarations in C++. If you could that might be the answer. Here's a snippet of what I tried: namespace PersonWeb.Models { public partial class Person { [RegularExpression(@"(\w|\.)+@(\w|\.)+", ErrorMessage = "Email is invalid")] public string Email { get; set; } /* ERROR: The type 'Person' already contains a definition for 'Email' */ } }

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• [Programming General] Advantages of using software framework

  - by ignatius

  Hello, I was reading these days about large projects implementation in python and Flex, and very often people praise the use of framework (like Cairngorm, PureMVC or others) over traditional OOP coding. I think i dont really understand the advantage of using FW, which is the strong point over classic programming? how big should be the project in order to use FW? it is intended mainly for web-applications? or can be used for desktop apps as well? hope, all these doubts dont sound stupid to you, i am not Computer engineer, just electronic, so my knowledge of sw architecture is very limited. Br

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• Entity Framework Custom T4 Template

  - by s7orm

  Hello, I am using the Entity Framework 4.0 and I am trying to extend my POCO classes generated by the standart T4 template with some custom properties. The classes which are generated by default from EF (without T4) contain 2 properties for every navigation property - NavigationPropertyId and navigationPropertyReference. What I am trying to do is basically extend the generated POCO class with an "Id" property of the foreign key object. I know that I can do that by editing the POCO t4 template. However I have no idea how I can populate/persist the property - I guess I have to somehow extend/modify the method than converts the object to a sql query and vice versa, but I have no idea where to start. Can anyone help? Edit: I just found out, that the EF team has planned to implement something like this - http://blogs.msdn.com/efdesign/archive/2010/03/10/poco-template-code-generation-options.aspx (see Basic POCO with/without Fixup), however this can take ages, so I rather implement it myself.

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• A PHP design pattern for the model part [PHP Zend Framework]

  - by Matthieu

  I have a PHP MVC application using Zend Framework. As presented in the quickstart, I use 3 layers for the model part : Model (business logic) Data mapper Table data gateway (or data access object, i.e. one class per SQL table) The model is UML designed and totally independent of the DB. My problem is : I can't have multiple instances of the same "instance/record". For example : if I get, for example, the user "Chuck Norris" with id=5, this will create a new model instance wich members will be filled by the data mapper (the data mapper query the table data gateway that query the DB). Then, if I change the name to "Duck Norras", don't save it in DB right away, and re-load the same user in another variable, I have "synchronisation" problems... (different instances for the same "record") Right now, I use the Multiton pattern : like Singleton, but multiple instances indexed by a key (wich is the user ID in our example). But this is complicating my developpement a lot, and my testings too. How to do it right ?

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• In separate data access & business logic layer, can I use Entity framework classes in business layer

  - by Greg

  In separate data access & business logic layer, can I use Entity framework classes in business layer? EDIT: I don't think I will need to swap out the data access layer from my business logic in the future (i.e. will be SQL Server), however I will for the UI layer. Therefore the question is more meant to be are there any major issues with using EF classes for me in the business layer? Seems like there would be less plumbing code.

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• Entity Framework Model with inheritance and RIA Services

  - by TimothyP

  Hi, We have an entity framework model with has some inheritance in it. The following example is not the actuall model, but just to make my point... Let's say Base class: Person Child classes: Employee, Customer The database has been generated, the DomainService has been created and we can get to the data: lstCustomers.ItemsSource = context.Persons; EntityQuery<Person> query = context.GetPeopleQuery().Take(4); context.Load(query); But how can I modify the query to only return Customers ?

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• Changing database structure at runtime with Entity Framework?

  - by Teddy

  Hi. I have to write a solution that uses different databases with different structure from the same code. So, when a user logs to the application I determine to which database he/she is connected to at runtime. The user can create tables and columns at any time and they have to see the change on the fly. The reason that I use one and the same code the information is manipulates the same way for the different databases. How can I accomplish this at runtime? Actually is the Entity Framework a good solution for my problem? Thanks in advance.

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• Entity Framework - Using a lookup (picklist) table with a lookup key

  - by Dave

  I'm working on a WPF application that is working well using the Entity Framework (3.5 SP1) for complicated table structures. The problem now is I want to get a list from the EF that includes lookups into a picklist table that has multiple picklists in it. In SQL I would write a sub select as such: SELECT Name, (Select typeName from PickLists where type_id = items.type_id and picklist_key=333) as Type_desc FROM Items There are no Foreign keys for this, and the picklists table is never updated using the EF, so it is read only as far as the EF is concerned. I'm not sure the best method to put this into the model if at all. I'm displaying in a read-only datagrid on a dashboard. Thanks!

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• Entitiy Framework: "Update Database from Model" instead of "Generate Database from Model"

  - by David

  Hey everyone, I have created a Entity Framework 4 model with Visual Studio 2010 and generated a database from it. Now I found myself adding new properties (with default values), changing documentation of columns, changing names of columns, changing types of columns several times. All tasks that do not require much "extra work" in order not to be possible to be achieved automatically (in my humble opinion). Everytime I did "Generate Database from Model" and lost of course the table data. Is there a way just to update the database's architecture so to say - leaving the table data untouched? Maybe with some user interaction especially when changing types etc.? Or would this functionality be simply too difficult to be realized to work in a reliable way? Thanks in advance! Cheers, David

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• !(ReferenceEquals()) vs != in Entity Framework 4

  - by Eric J.

  Unless a class specifically overrides the behavior defined for Object, ReferenceEquals and == do the same thing... compare references. In property setters, I have commonly used the pattern private MyType myProperty; public MyType MyProperty { set { if (myProperty != value) { myProperty = value; // Do stuff like NotifyPropertyChanged } } } However, in code generated by Entity Framework, the if statement is replaced by if (!ReferenceEquals(myProperty, value)) Using ReferenceEquals is more explicit (as I guess not all C# programmers know that == does the same thing if not overridden). Is there any difference that's escaping me between the two if-variants? Are they perhaps accounting for the possibility that POCO designers may have overridden ==? In short, if I have not overridden ==, am I save using != instead of ReferencEquals()?

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• Entity Framework mant to many insert

  - by Jacob

  I've been playing around with Entity Framework v2 and added some code to insert new entity with many to many relationship , lets say this entity is called meeting. I add hours to meeting : meeting.Hours.Add(hour); and I get different errors on different occasions On Update : Cannot insert the value NULL into column 'Meetings_Id', table 'Plan.dbo.MeetingHour'; column does not allow nulls. INSERT fails. The statement has been terminated. On Inset : An item with the same key has already been added. But the tricky party is that if I add this manually trough SQL Server Management Studio , I can update the entity with the same value , clearing it first (meeting.Hour.Clear()) Can't see what could be the problem , maybe entity model isn't mapped correctly ?

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• ext error with zend framework mvc

  - by terrani

  Hi, I am trying to setup ext javascript grid within zend framework mvc. I included ext css and js using the following code. $this->headScript() ->appendFile('/Resource/scripts/ext/jquery-1.4.2.js') ->appendFile('/Resource/scripts/ext/jquery/ext-jquery-adapter.js') ->appendFile('/Resource/scripts/ext/jquery/ext-all.js'); $this->headLink() ->appendStylesheet('/Layouts/admin/css/content.css') ->appendStylesheet('/Layouts/admin/css/ui.css') ->appendStylesheet('/Layouts/admin/css/button.css') ->appendStylesheet('/Layouts/admin/css/moon.css') ->appendStylesheet('/Resource/scripts/ext/css/ext-all.css'); when I run the code, I get the following error message from firefox. syntax error [Break on this error] \n What should I do to fix this?

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• Sending multipart response for downloads in Zend Framework

  - by takeshin

  I'm sending files in action helper for downloads (in parts if needed) like this: ... $response->sendHeaders(); $chunksize = 1 * (1024 * 1024); $bytesSent = 0; if ($httpRange) { fseek($file, $range); } while(!feof($file) && (!connection_aborted() && ($bytesSent < $newLength)) ) { $buffer = fread($file, $chunksize); // $response->appendBody($buffer); // this would be better print($buffer); flush(); $bytesSent += strlen($buffer); } fclose($file); I suspect that better way would be to make use of $response object instead of print. Which is the recommended way to send big response objects using Zend Framework?

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• .Net Compact Framework 2.0 touch and nice controls [.netcf 2.0]

  - by eridem

  Hello! I would like to know if somebody knows free custom nice controls for .NET Compact Framework 2.0. There are nice controls as Manila Interface SDK (http://forum.xda-developers.com/showthread.php?t=566188), Sense Interface SDK (http://forum.xda-developers.com/showthread.php?t=648906) and so on for free, but they work only on .NET CF 3.5. Furthermore, there are others that you have to pay for them and for .NET CF 2.0 and 3.5 (Resco or Touch Control Suite). And there is one called Fluid (http://fluid.codeplex.com/) but it's so complicated, there are not exactly controls (are classes added to a host control) and there is not much documentation to work with it. Any nice controls for free and working in .NET CF 2.0? And with list sliders if it's possible? Thanks!

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• Changing an extention method from linq-to-sql to entity framework

  - by Jova

  I'm changing my project from working with Linq-to-SQL to working with Entity Framework. I have some extention methods that extend the classes created by LINQ and I'm wondering how to change them to work with the entities instead Here's an example. public static int GetPublishedArticlesCount(this Table<Article> source) { return GetPublishedArticles(source.Context as DataContext, null).Count(); } This method gets the number of published articles. Instead of using this Table<Article>, what should I use instead?

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• Shorten Zend Framework Route Definitions

  - by Sebastian Hoitz

  Hi! How can I shorten the definition of my custom routes in Zend Framework? I currently have this as definition: $route = new Zend_Controller_Router_Route( ":module/:id", array( "controller" => "index", "action" => "index" ), array("id" => "\d+") ); self::$frontController->getRouter()->addRoute('shortcutOne', $route); $route = new Zend_Controller_Router_Route( ":module/:controller/:id", array("action" => "index"), array("id" => "\d+") ); self::$frontController->getRouter()->addRoute('shortcutTwo', $route); $route = new Zend_Controller_Router_Route( ":module/:controller/:action/:id", null, array("id" => "\d+") ); self::$frontController->getRouter()->addRoute('shortcutThree', $route); Is there a way to better combine these rules? And what are your best practices in where to place these? I currently have them in my bootstrap class right after the Front Controller initialization.

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• VS2010 MVC and Entity Framework Model in Separate Project

  - by mdm

  Hi, I am trying to use an Entity Framework Model (in separate project) into an asp.net 4 MVC project (VS2010, C#) If I create the EF inside the MVC project I have no problems. I think I am missing some step. things done: 1. added reference to the EF class project 2. added connection string in MVC web.config 3. added reference to System.Data.Entity in both web.config and project references Now i can use the model only if I copy the .edmx file to the Models folder, but in this way the EF project is not external anymore. What am I missing? Thank you in advance.

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• Entity Framework 5 vs Telerik OpenAccess ORM (specifically)

  - by dimoss

  I am starting a new project and want advice on choosing an ORM. I know this topic has been brought up before, but this topic is specific to either Entity Framework 5 (not 4) or Telerik OpenAccess ORM. The project will reside on Windows Azure and use Windows Azure SQL Database. I will migrate it to .NET 4.5 once 4.5 is live on Azure. I am currently a Telerik Ultimate Collection subscriber. Does anyone in the know have any pros/cons for this scenario? I am slightly leaning towards Telerik OpenAccess at the moment. Thanks

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