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  • How do I delete multiple rows in Entity Framework (without foreach)

    - by Jon Galloway
    I'm deleting several items from a table using Entity Framework. There isn't a foreign key / parent object so I can't handle this with OnDeleteCascade. Right now I'm doing this: var widgets = context.Widgets .Where(w => w.WidgetId == widgetId); foreach (Widget widget in widgets) { context.Widgets.DeleteObject(widget); } context.SaveChanges(); It works but the foreach bugs me. I'm using EF4 but I don't want to execute SQL. I just want to make sure I'm not missing anything - this is as good as it gets, right? I can abstract it with an extension method or helper, but somewhere we're still going to be doing a foreach, right?

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  • Entity framework MappingException: The type 'XXX has been mapped more than once

    - by Michal
    Hi everyone, I'm using Entity framework in web application. ObjectContext is created per request (using HttpContext), hereby code: string ocKey = "ocm_" + HttpContext.Current.GetHashCode().ToString(); if (!HttpContext.Current.Items.Contains(ocKey)) { HttpContext.Current.Items.Add(ocKey, new ElevationEntityModel(EFConnectionString)); } _eem = HttpContext.Current.Items[ocKey] as ElevationEntityModel; Not every time, but sometimes I have this exception: System.Data.MappingException was unhandled by user code Message=The type 'XXX' has been mapped more than once. Source=System.Data.Entity I'm absolutely confused and I don't have any idea what can caused this problem. Can anybody help me? Thanks.

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  • Repository Pattern and Entity Framework.

    - by vitorcast
    Hi people, I want to make an implementation with repository pattern with ASP.NET MVC 2 and Entity Framework but I have had some issues in the process. First of all, I have 2 entities that has a relationship between them, like Order and Product. When I generate my dbml file it gaves me a class Order with a property that map a "ProductSet" and one class Product with a property that map wich Order that Product relates itself. So I create my Repository pattern like IReporitory with the basic CRUD operations and inside my controllers I implement the ProductRepository or OrderRepository. The problem occurs when I try to create Product and have to assign my Order on it, like ProductOne.Order = _orderRepository.Find(orderId); That operation gave me some strange behavior and I can't find out what is wrong with it. Thanks for the help.

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  • Zend Framework - Zend Tool - Module error: I have error after I create module with Zend Tool

    - by Yosef
    Hi, I new in zend framework. I create zend project with zend tool and its works , but i create module and when i try access him with browser I get Error. I write my steps, please help me. Thanks, Yosef My steps: $ sudo zf create project mystore put Zend library inside library test: http://localhost/mystore/public/ (working) Add module store (not working) $ sudo zf create module store add to application.ini path to modules resources.frontController.moduleDirectory = APPLICATION_PATH "/modules" resources.modules = "" test1: http://localhost/mystore/public/store/ test2: http://localhost/mystore/public/store/public/ test3: http://localhost/mystore/public/modules/store/public/ test1+2+3 result: An error occurred Page not found Exception information: Message: Invalid controller specified (index.php) Stack trace: #0 /var/www/mystore/library/Zend/Controller/Front.php(954): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http)) #1 /var/www/mystore/library/Zend/Application/Bootstrap/Bootstrap.php(97): Zend_Controller_Front->dispatch() #2 /var/www/mystore/library/Zend/Application.php(366): Zend_Application_Bootstrap_Bootstrap->run() #3 /var/www/mystore/public/index.php(25): Zend_Application->run() #4 {main} Request Parameters: array ( 'module' => 'store', 'controller' => 'index.php', 'action' => 'index', )

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  • Entity Framework inheritance: TPT, TPH or none?

    - by silverfighter
    Hi, I am currently reading about the possibility about using inheritance with Entity Framework. Sometimes I use a approch to type data records and I am not sure if I would use TPT or TPH or none... For example... I have a ecommerce shop which adds shipping, billing, and delivery address I have a address table: RecordID AddressTypeID Street ZipCode City Country and a table AddressType RecordID AddressTypeDescription The table design differs to the gerneral design when people show off TPT or TPH... Does it make sense to think about inheritance an when having a approach like this.. I hope it makes sense... Thanks for any help...

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  • Using CHDataStructures.framework on iPhone

    - by nununo
    Hi, I'm new to iPhone programming and I'm trying to use CHDataStructures in my project. But I'm running into some issues: When I directly try to build it right after download I get the error "Foundation/Foundation.h" no such file or directory. The Active SDK is "Use Base SDK" and the active architecture is x86_64. I believe I should set the Active SDK to the iPhone SDK but it isn't listed there; At some point (I don't remember how) I managed to tweak it and I got the iPhone SDK (simulator) in the active SDK but when I tried to build it I got the following error: "target specifies product type 'com.apple.product-type.framework', but there's no such product type for the 'iphonesimulator' platform"; And now I'm stuck. What am I doing wrong? Thanks in advance, Nuno

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  • Entity Framework One-To-One Mapping Issues

    - by Baddie
    Using VS 2010 beta 2, ASP.NET MVC. I tried to create an Entity framework file and got the data from my database. There were some issues with the relationships, so I started to tweak things around, but I kept getting the following error for simple one-to-one relationships Error 1 Error 113: Multiplicity is not valid in Role 'UserProfile' in relationship 'FK_UserProfiles_Users'. Because the Dependent Role properties are not the key properties, the upper bound of the multiplicity of the Dependent Role must be *. myEntities.edmx 2024 My Users table is consists of some other many-to-many relationships to other tables, but when I try to make a one-to-one relationship with other tables, that error pops up. Users Table UserID Username Email etc.. UserProfiles Table UserProfileID UserID (FK for Users Table) Location Birthday

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  • install play-framework in Ubuntu 9.10

    - by Shekhar
    I have copied zipped file from the playframework.org website and unzipped it at a location. I have inserted it in my .bashrc profile to set up as PATH environment. But still, the play command is not accessible from anywhere. And even in the installed directory of the framework, the play file is not running as it is. I have to prefix python before any play command to run it. Am i making a mistake somewhere? Please help me.

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  • Unable to list owned images and running instances from Amazon Web Services using Zend Framework

    - by Marcel Tjandraatmadja
    I am using Zend Framework's library to manage EC2 instances and AMI. However I can't list the AMI's I own and can't list existing EC2 instances. $ec2Instance = new Zend_Service_Amazon_Ec2_Instance($awsAccessKey, $awsSecretKey); $instances = $ec2Instance ->describe(); $ec2Instance -describe() should list all instances but it is returning no instances even though I have three of them running at this time. $ami = new Zend_Service_Amazon_Ec2_Image($awsAccessKey, $awsSecretKey); $images = $ami->describe(); $ami-describe() returns all the public images but none of them are the ones I created even though I have two AMIs. Does any one know what I am missing here?

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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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  • 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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  • 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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  • 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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  • [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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  • 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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  • 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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