Multiple Join In Entity Framework And Include All Data?

Dec 10, 2010

I want to write a query in Entity Framework that has multiple joins. The only problem is the tables arn't related using their primary / foreign keys (its the Umbraco database), as such I can't use .Include and the Navigation properties.

Essentially the query I would like to run is this:

select t.*, n.* from cmsContentType t
inner join cmsContentTypeAllowedContentType a on t.nodeId = a.Id
inner join vicinity.DocumentTypeExtendedProperty x on x.UmbracoDocumentTypeId = t.pk
inner join umbracoNode n on n.id = t.nodeId

I have two EF entities mapped to cmsContentType and umbracoNode as such I would like them to be populated as if I was running the query like

var q = from p in cmsContentType.Include("umbracoNode")

View 4 Replies


Similar Messages:

ADO.NET :: Order By An Include Entity In Entity Framework?

Sep 24, 2010

I am trying to do something like this:

[Code]....


But ofcourse it is not working as I want to. The Ordering works on Question.Order, but I would also the
Questions.SubQuestions List to be ordered according to SubQuestions.Order

View 2 Replies

ADO.NET :: Entity Framework - How To Join Tables Without LINQ And With Only String

Sep 30, 2010

I have a question about Entity Framework. answer if you know answer on this. I have such query :

[Code]....

Particularly I want to join few tables in one query, but I can NOT use LINQ and can NOT use ObjectQuery with objects mapped to DB fields inside my query. Because each entity creates dynamically. So this is what i

can NOT use : [URL]

The question is can I use something like this instead of using objects?

[Code]....

The purpose is to use Join method of ObjectQuery with syntax as in Where method :[URL]

View 2 Replies

DataSource Controls :: Left Join With Entity Framework?

May 17, 2010

how to do this query in EF1:

[Code]....

View 3 Replies

ADO.NET :: Add Include Keyword In ObjectResult In Entity Framework?

Mar 8, 2011

I'm Using Entity Framework in my ASP.NET Web Application and I added Procedure tom my Model and Create Function for it which will return ObjectResult ... i want to add Include Keyword to that object Result ... so how can i get childs for that object result

View 2 Replies

C# - How To Include Ampersand In Connection String Password After Using Entity Framework

Sep 29, 2010

I'm using Entity Framework 4 for a simple app and would like to bake my connection credentials into the following connection string:

<connectionStrings>
<add name="MyEntities"
connectionString="metadata=res://*/MyDataModel.csdl|res://*/MyDataModel.ssdl|res://*/MyDataModel.msl;provider=System.Data.SqlClient;provider connection string="Data Source=localhostDEV;Initial Catalog=MyDB;UserId=myUser;Password=jack&jill;MultipleActiveResultSets=True""
providerName="System.Data.EntityClient" />
</connectionStrings>

However, the password (which I cannot change) contains an ampersand. ASP.NET throws:
Configuration Error: An error occurred while parsing EntityName. Line XX, position YYY.

If I replace the ampersand in the password with &, I get a SqlException: Login failed for user 'myUser'. Usually this trick works, but I'm guessing that something is failing because this is technically a connection string inside a connection string.

What should I do here? Most of my classes include code like:

using (var context = new MyEntities()) {
// do work
}

Update: It turns out that the credentials I am using are a domain account, so what I really need is Integrated Security=True in the connection string rather than a password.

Encoding the ampersand as indicated in the accepted answer should work fine, though I haven't tested it.

View 3 Replies

Entity Framework 4 - Check If Navigation Property Collection Is Empty, Without Include() Or Load()?

Sep 28, 2010

In an MVC view, I'm looking for a way to determine if a parent entity's collection of child entities is empty, so I can decide if I need to call a RenderPartial() or not.

For a one-to-one I've been using the following:

<% if (Model.Book.GenreReference.EntityKey != null) %>
{.....}

but I'm unsure how to do it in a one-to-many scenario, or if it can even be done without the use of Include() or Load().

View 2 Replies

Entity Framework - Combine Multiple Data Sources To A Single Repeater?

Mar 9, 2011

I have a repeater like so:

[Code]....

Problem is, I also want to show the viewer the available number of spots in the room. But this requires somehow pull in either the current_occupancy / max_occupancy or in performing a calculation (e.g. max_occupancy - current_occupancy = actual_available) and then returning that with the room.

The end result I'm looking for is to return each room in a button control with text that looks like this:
"Room 1 - 2 Open" "Room 8 - 1 Open" and so on

View 2 Replies

Exporting Entity Framework 4 Data Model To Entity Framework 3.5?

Oct 25, 2010

Is there a way to export a EF 4.0 Data Model to EF 3.5?

I looked around and found that we are not able to access EF 4.0 from a ASP.Net 3.5 project here: [URL]

Our project is the 1st to go to .Net 4.0 using Entity Framework and we (the team) were wondering if there was a way for the other projects that "might" need to access our data that are still using the .Net 3.5 framework.

View 1 Replies

ADO.NET :: Entity Framework With Multiple Database Servers

Feb 7, 2011

We have an IVR product that reads a configuration database for callflow information. I am writing a tool for our implementation team that will allow them to add/delete/update the data in the configuration database. Once the tool is in production, the implementer will use only the production release of the tool to modify the configuration database in all four of the IVR regions (Dev, QA, Cert, and Prod). Each region has its own database with identical schemas. The tool has 'tabs' across the top for each region. If a user is currently working in the Dev region and clicks the QA tab, how do I switch my connection from the Dev db server to the QA db server?

View 3 Replies

Entity Framework - Use Of Self-Tracking Entities In Across Multiple Posts

Dec 14, 2010

I have a model that consists of Order, OrderLine, Product.

I want to create an Order and add OrderLines (each OrderLine related to a Product). I create the Order and add new OrderLines to it. Between posts I store the Order entity in Session (or ViewState). Just so you know I have added suppport for binary serialisation which works fine.

The relationship is therefore Order > OrderLine(s) > Product(s).

You might have already guessed what the problem is - that when I SaveChanges() I get the usual 'AcceptChanges cannot continue because the object's key values conflict with another object in the ObjectStateManager.' error.

I have referred to a number of articles online but none seem to handle this case (where I have the relationship across more than two entities) e.g. [URL].

This must be a very common requirement surely? Is there anyone out there doing the same kind of thing with Entity Framework (and without using DTOs etc)?

View 2 Replies

Using Multiple ObjectContexts In Entity Framework 4 With The Repository/uow Pattern

Jan 17, 2011

i am using EF4 and StructureMap in an asp.net web application. I am using the repository/unit of work patterns as detailed in this post. In the code, there is a line that delegates the setup of an ObjectContext in global.asax.

EntityUnitOfWorkFactory.SetObjectContext(() => new MyObjectContext());

On the web page code-behind, you can create a generic repository interface like so ...

IRepository<MyPocoObject> ds = ObjectFactory.GetInstance<IRepository<MyPocoObject>>();

My question is what is a good approach to refactoring this code so that I can use more than one ObjectContext and differentiate between them in the code-behind? Basically i have two databases/entity models in my application and need to query them both on the same page.

View 1 Replies

Using Entity Framework To Connect To Multiple Similar Tables In MVC?

Jun 10, 2010

A relative newcomer to .net MVC2 and the entity framework, I am working on a project which requires a single web application, (C# .net 4), to connect to multiple different databases depending on the route of access, (ie subdomain).

No problem with this in principle and all the logic is written to transform the subdomain into an entity connection and pass this through to the Entity Model.

The problem comes with the fact that the different database whilst being largely similar in structure contain 3 or 4 unique tables bespoke to that instance.

To my mind there are two ways to solve this issue, neither of which i am sure will be possible.

1/ Use a separate entity model for each database. -Attempts down this route have through up conflicts where table/sp names are the same across differnt db's, or implicit conversion errors when I try and put the different models in different namespaces. or

2/ Overwrite the classes which refer to the changeable database objects based on the value of a base controller property.

My question is if either of theser routes can ever work in principle or if i should just give up on the EF and connect to the dtabases directlky using ADO. Perhaps there is another way to solve this problem i haven't thought of?

View 1 Replies

ADO.NET :: Entity Framework ContainsAll Matching Multiple Values

Jan 21, 2011

So, have a search form where users can enter one or more keywords, these keywords are then held in a List<string> called keywords. Now using Entity Framework have an Organisation entity with a Name field. What I want to do is select those organisations whose name contains all the keywords. I don't care if they are in the right order or not but it just contain all the keywords. Also organsiations is a big table in the database so I don't want to materialise all the organsiation objects on the server and then loop through them. So what I'm looking for (excuse my LINQ naivety here) is equivalent to the non-existent LINQ statement:

[Code]....

I'm sure this must have already been answered but just can't find it.

View 6 Replies

Web Forms :: Entity Framework Multiple Rows Update

Feb 24, 2013

I am using Entity Framework 4.0. I want To write a query for multiple row update.

Then how to write Query for multiple row update in Entity Framework.

View 1 Replies

How To Insert Multiple Rows Using Entity Framework In Studio 2008

Oct 7, 2010

i'm trying to use Entity Framework to insert into SQL SERVER 2005, using Visual studio 2008.the following codes are a Button onclick event,I want to insert into DB multiple rows at a time

[Code]....

however this does not work, it seems we can only insert into DB only one row at a time

View 2 Replies

DataSource Controls :: How To Save Multiple Rows Using ADO.NET Entity Framework

Mar 23, 2010

public void saveOptionalCourses( ArrayList coursesAdded, int studentID)
{
StudentOptionalCoursesXRef XRefObject = new StudentOptionalCoursesXRef();
using (var EntityObject = new SchoolProjectEntities2())
{
foreach ( string list in coursesAdded)
{
XRefObject.StudentDetails = EntityObject.StudentDetails.Where(c => c.StudentID == studentID).First();
XRefObject.OptionalCourses = EntityObject.OptionalCourses.Where(c => c.OptionalCourseName == list).FirstOrDefault();
EntityObject.AddToStudentOptionalCoursesXRef(XRefObject);
}
EntityObject.SaveChanges();
}

with this above method and could save only last row that am returning remaining rows are iterated but are not saving on to database

View 2 Replies

ADO.NET :: Adding A New Entity In Entity Framework 3.5 With Related Data?

Aug 5, 2010

I am trying to add a new entity and have to refernce associated data to add it. I cannot load the Referencetables. Giving "The EntityReference could not be loaded because it is not attached to an ObjectContext." How do i complete this task in Entity Framework 3.5

[Code]....

View 1 Replies

ADO.NET :: Entity Framework With Stored Procedure Versus Entity Framework Without Stored Procedures

Nov 2, 2010

I am new to entity framework , it is really very good , but I want to know what is the difference between using entity framework with stored procedure or without stored procedure , which one the faster and what is the benefits for using stored procedures with entity framework.

View 1 Replies

Entity Framework -Update Entity When Another Entity Is Updated

Jun 30, 2010

I have an EDM, it includes the entities extension and history. My goal is to use history to keep track of all the changes made to extension entity. For example, if extension with ID 223 has its property 'Name_Display' changed - I want the history entity to record this.

I'm using ASP.NET with VB.NET. Where in my code do I put the hook to say, "update the history entity" and what should that hook look like?

View 1 Replies

MVC :: Using Data From Multiple Entity Framework4 Model Entity Objects In MVC2 Controller?

Sep 29, 2010

getting data from multiple Entities models into an MVC controller. Most of the examples I have seen for using EF in an MVC2 app only use a single entitiy.

I have just started using MVC2 in C# using the Entity Framework models (CIOps.model) created from an SQL database. I can create the controller and views using single tables of the model in MVC2, but I just cannot get my head around how to get data from multiple entity tables into the controller (similar to joins in T-SQL). I have included an example below of the controller code that works with a single entity table, tbl_tours (tbl_tour in DB).

Could someone please illustrate how this code would be changed to include additional columns from FK tables in addition to tbl_tours columns. E.g. the clients name from the tbl_clients, the coordinators name from the tbl_employees, and costs from tbl_costs entities? Is it possible to do this directly using the EF model entities/classes that are already created and not use LINQ, POCO, Repositories, etc.? The FK relationships are already in the EF models. I have included the whole controller code, but I just need a few examples of how to join the multiple entities, not rewrite every CRUD function function in the controller. I think this will get me over the hump in using EF in an MVC2 App. Also ignore the fact I am using the home controller, this will change in the application.

[Code]....

View 21 Replies

Cast Exception When Try To Insert Entity In Entity Framework (using Code-f)

Feb 9, 2011

I get an cast exception when i am trying to insert an entity in Entity Framework (using code-first). From this code :

public virtual T Insert(T entity)
{
return Context.Set<T>().Add(entity);
}

The cast exception is like "impossible to cast ...Collection'1(Entity) to type (Entity)" I can't figure out why. I am pretty sure ive done everything right. Post entity

public class Post
{
public long PostId { get; private set; }
public DateTime date { get; set; }
[Required]
public string Subject { get; set; }
public User User { get; set; }
public Category Category { get; set; }
[Required]
public string Body { get; set; }
public virtual ICollection<Tag> Tags { get; private set; }
public Post()
{
Category = new Category();
if (Tags == null)
Tags = new Collection<Tag>();
}................................

View 9 Replies

ADO.NET :: Entity Framework - Entity Stored Procedure Mapping - Can't Update

Feb 10, 2011

I am mapping a stored procedure to an entity by right clicking on the entity (in the .edmx) and selecting "Stored Procedure Mapping." This brings you to a Mapping Details - "Name of Entity" Window that allows you to select the insert, update, and delete stored procedures associated with the Entity. It also maps the stored procedure parameter to the Entity "Property" (Column).

I'm gettin an error "error 2042: Parameter Mapping specified is not valid." The cause of the error is fairly obvious, in the Insert stored procedure that has been selected, a 'CHAR' parameter is being mapped to an Int32 Entity Property. I altered the stored procedure parameter to match the entity, I deleted the stored procedure, readded, and reslected it as the Insert function. I also cleaned, validated, updated model from database. No matter what I do, the parameter list in the mapping details doesn't reflect the change to the stored procedure. It's stuck on a char --> int32 mapping, even though it has been changed, like it's buried deep in meta data some where.

View 2 Replies

ADO.NET :: Entity Framework Copy Entity And Change PK And Save Old And New

Mar 31, 2011

I have a stupid problem with the Entity Framework. I get the following Exception:

[Code]....

I have an entity with a 4 fields representing the primary key. I copy it via serialization (works fine). I set the old entity to not valid (Datefield set to a date in the past, this field is part of the PK) and set the copied entity to DateTime.Now.Date. When I call context.AddObject I get the Exception above. I tried copying the entity via reflection but the entity has 3-4 references. And when copied, I get another Exception before even Adding the entity to the context. I also tried setting newObj.EntityKey = null and reset all the fields neccessary for the PK. I just want a whole copy of an entity with a different primary key (and some other fields changed too) and Create it in the database.

View 1 Replies

What's The Best Entity Framework - Data Access

Aug 9, 2010

I have been asking my self this question from the time i started workin in the software development field, What is the best way to access data? Which gives the best performance? Which is the best for maintainability? There are lots of solutions to deal with database in the Asp.Net web app,Entity framework 4.0 Classes generator using ADO.Net such as Code Author ( i liked the way it works and the way it accesses the database using the data access block in Microsoft Enterprise Library). i will start a new project tomorrow,and i don't know which approach is better?

View 2 Replies







Copyrights 2005-15 www.BigResource.com, All rights reserved