ADO.NET :: EF4 Entities / Create Entities, For Instance, That Only Contains Contact Details Of Client Table?
Nov 16, 2010
I have a datamodel with a couple of tables. One of my tables have about 40 fields (I know that is a lot, but we have to keep the structure in place as we are upgrading a classic ASP project to MVC). Some of my Actions only updates 1 or 2 fields in my table.
Is there a way to create Entities, for instance, that only contains the contact details of the client table, and not any other details, and then another entity that contains only the address details. I don't want to submit the entire row when I only update telephone details, or the client's picture.
View 1 Replies
Similar Messages:
Sep 28, 2010
We are starting a new web based product in which we are planning to expose our business logic through WCF services. We will be using ASP.NET 4.0, C#, EF 4.0. In future we want to build iphone applications and WPF applications based on the services. I have been reading a lot about using POCO vs Self Tracking Entities (STE) and from my understand the STEs do not work well with the web scenario.
View 3 Replies
Nov 23, 2010
Im my MVC 3.0 Application, I created a helper like below;
[Code]....
And I used that helper in a linq query as below;
[Code]....
When I fire my app, it gives me the below error. LINQ to Entities does not recognize the method 'System.String GenerateURl(System.String)' method, and this method cannot be translated into a store expression. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.NotSupportedException: LINQ to Entities does not recognize the method 'System.String GenerateURl(System.String)' method, and this method cannot be translated into a store expression. Source Error:
Line 43: public Blogs GetBlog(string urlstring) {
Line 44:
Line 45: return GetAll().SingleOrDefault(x => BlogUrlGeneration.GenerateURl(x.ArticleTitle).Equals(urlstring));
Line 46: }
Line 47:
İn my blog, the link will be like below; [URL] so I need to set the above urlgenerator class into lambada. How can I do that? What would it take to make that work perfectly
View 4 Replies
Jun 16, 2010
Can some one inform me whether I need to replicate the same set of entities in the client which are similar to that of the ones in the server? I have planned to start a proj with service functions as wcf services and in turn they are getting referred in silverlight client application.
Incase if i need to consider casting to or back from the return value lists of service methods in the server, should i be creating entity class in the client application as well? Or is there a work around? Something like exposing the entities from the server just as the services functions?
View 1 Replies
Nov 4, 2010
I have a table of user ids that is huge.
I have an array of user ids that I want.
I have two tables that have a foreign user id key.
What is the best way to get this information performance wise?
Ideally in SQL the final result would be somewhat like this (null values if there is no user ID in one table but not the other):
userid table1value table2value
1 null 12
5 123 null
View 3 Replies
Sep 1, 2010
is there any way to Create entities from asmx webservice? Instead of mapping to dataBase. Map it to webservice classes.
View 1 Replies
Dec 15, 2010
In linqtosql you could do something like:
datacontext.CreateDatabase() to generate a database from the model in sql.
I'm wanting to do the same thing in linq to entities.
Say I have a class MyEntities which inherits from ObjectContect is there a similiar method?
View 2 Replies
Apr 8, 2010
In my application I'm pulling back a user's "feed". This contains all of that user's activities, events, friend requests from other users, etc. When I pull back the feed I'm calling various functions to filter the request along the way.
var userFeed = GetFeed(db); // Query to pull back all data
userFeed = FilterByUser(userFeed, user, db); // Filter for the user
userFeed = SortFeed(userFeed, page, sortBy, typeName); // Sort it
The data that is returned is exactly what I need, however when I look at a SQL Profile Trace I can see that the query that is getting this data does not filter it at the database level and instead is selecting ALL data in the table(s).
This query does not execute until I iterate through the results on my view. All of these functions return an IEnumerable object.
I was under the impression that LINQ would take all of my filters and form one query to pull back the data I want instead of pulling back all the data and then filtering it on the server.
View 2 Replies
Feb 2, 2010
I have 3 tables. Blog and Tag have a many to many relationship. BlogTag is a junction table with a quantity column.
**Blog**
BlogID
Title
**Tag**
TagID
Name
**BlogTag**
BlogID
TagID
Quantity
I'm not sure how I handle the quantity column. I'd like it to store how many Blogs have a certain Tag NameHow do I deal with the quantity column when adding a new blog that has tags?
View 1 Replies
Sep 18, 2010
(Using SQL Server 2008 and ASP.NET MVC2)I have a simple business table and a category table. I have a 3rd table to map business to category, a many-to-many relationship. the Map table contains a BusinessID and CategoryID. I'm lost as to how I can load the categories into my Business View Model using the entities model.Without incorporating categories, my code looks like this:
[Code]....
with Business View Model defined as:
[Code]....
but if i want to populate the Categories with the mapped categories, how would one do that?
View 1 Replies
Dec 18, 2010
any tutorials or materials that to implement a custom membership provider where I can using Linq to Entities for data retrieval in its internals?
View 1 Replies
Feb 4, 2010
Using a very run-of-the-mill database, with identity int for primary keys, a Dynamic Data Entities Project (EntityFramework) displays the primary key for view and edit. When using Linq to Sql, the primary key fields are not displayed.
I would like to hide the primary keys and use Entity Framework (VS 2008, .Net 3.5 sp1).
View 1 Replies
Jan 20, 2010
I have placed a textbox, dropdownlist and command button in a section of my master page. The textbox, named txtsearch, will be used to input a search string. The dropdownlist, named ddlsearch, will be used to specify in which field to search in the table, either part name or NSN.
Questions:
What VB code do I use to save the value entered into txtsearch as a search string? How do I pass that value to my entitydatasource? How do I tell entitydatasource to search in either the part name or NSN field based on the value of ddlsearch?
View 1 Replies
Sep 25, 2010
How to use Stored Procedures with Linq to Entities? I prefer an example with input and output The videos on asp.net only show how to do this with Linq to SQL.
View 5 Replies
May 13, 2010
I have a simple join:
SELECT * FROM MessageAlerts AS A LEFT OUTER JOIN Contacts AS C ON A.ContactId = C.Id LEFT OUTER JOIN
Users AS U ON A.UserId = U.Id INNER JOIN Businesses AS B ON B.Id = C.BusinessId OR B.UserId = U.Id
how to do this : ON B.Id = C.BusinessId OR B.UserId = U.Id with linq in entity framework.
View 2 Replies
Jan 27, 2010
WHY are all the examples on this site linq to SQL? Did ms not themselves announce dropping support for l2SQL over a year ago? i really don't get it. Examples are great.. but really not helping me since i've gone ahead and listened to MS. And can someone at MS clarify what the position is for linq 2 SQL.. Is it supported? Recommended? What the hell.
View 7 Replies
Mar 9, 2011
I use Linq To Entities to get 2 objects m1 & m2. And I don't understand why 2 different objects reference the SAME Template table.
I suspect that the reason due to the connection between MConfigOnPage1, MConfigOnPage2 with MConfiguration. Maybe it should be splitted somehow?
Here I attached my ERD and the code.
[Code]....
View 2 Replies
Feb 19, 2011
I make ASP.NET MVC3 application for spa and I've encoutered problem with M:N relationship. I've got this model Each Insurance Company has different pricing for each patient medical indication, so sample data looks like this:
IC
Indication
Patient
IC1
Indication1
Patient1
Patient2
Indication2
Patient3
[Code]....
And I don't know how to make Edit with possibility of changing not only Indication but IC to.
View 1 Replies
Aug 11, 2010
Having the following model Admin and AdminGroup is joined by AdminAdminGroup which has (AdminId, AdminGroupId) fields. When I add a new Admin row AdminGroups are associated with it automatically however this only works on INSERT.When I'm trying to update or associate more AdminGroup's with particualr Admin row (_repo.Update((DataLayer.Admin)row);) only Admin gets updated and no groups are ever modified.What is the correct way of updated "related" entities? so that AdminGroup also get's updated.
View 6 Replies
Mar 28, 2011
i am having a little problem in mapping all the entities in contained in the namespace "nhibernateTest.Domain" . it basically contains all the Map Classes like , StudentMap, DepartmentMap etc. .. now in case of normal nhibernate what we used to do is :
[Code]....
now what it used to do is . look for all the "*.hbm.xml" files in my namespace and automatically map them...
how to do the same for fluent nHibernate ? so that it looks for all map classes in folder
"nhibernateTest.Domain" ...resolve the namespace "nhibernateTest.Domain"... and automatically map them so that i dont have to create the session separately for diffrent Map classes ?
View 1 Replies
Apr 20, 2010
I have the following admx:
I have to add the (AccData, CntactData, PhnNumber, FnclDetail)entities to the database in one shot
What's the best practices to do the add operation for the above entities??
View 2 Replies
Dec 23, 2010
I have I method where I insert muliple records to a SQL Server 2008 database. The table in which the records are inserted has a primary key integer column with auto increment. The problem is that I have another column called GroupId where I want an integer representing the current insert to be set, i.e. for each time the method gets called a new group id should be generated the group id column of the records to be inserted should be set to this value. What's the best way to generate this group id? I guess I could do a SELECT MAX(GroupId) + 1 FROM Table to generate an id before I make the inserts but this won't be a good solution when it comes to concurrency.
View 13 Replies
Nov 10, 2010
I am trying to learn LINQ to entities, and am working out how to best structure my BLL layer. I have generated the entity model and have created a generic repository in my DAL that returns results as IList<T>. I initially created the BLL to also return
results as IList<T>:
public IList<DAL.Customer> SelectAll()
{ [code]...
Now I am working on the aspx page, and I can create an ObjectDataSource and configure it to use my BLL, but since I am returning IList, I can't sort since I am not using a DataView. I have seen some articles on the web for converting IList to DataView, but that seems like a lot of overhead for every query.My goal is to keep a clean separation between layers without making things overly complicated. I would like to know how others have done this, or maybe a link to a good tutorial that shows how to structure all three layers.
View 8 Replies
May 13, 2010
I have the following code for the SelectedIndexChanged event of a drop down list. This works fine as it is but this entity has a relationship to another entity (Genre). if i change the select statement to { m, m.Genre.MovieGenre }).ToList(); it doesnt work as contains anonomyous types.
[code].....
View 1 Replies
Apr 15, 2010
I typically don't play with betas, so I am just now getting used to vs 2010 pro. I grabbed it from DreamSpark yesterday, and so far I like all the changes.
I was wondering though, with some of the changes to ado.net EF, is there now a way to set a coding namespace for both the context as well as the entities, instead of just setting the custom tool namespace (this wraps both context and entities)? Typically, I like having my classes grouped into namespaces by type, and since a context isn't an entity, it shouldn't go in the entities namespace. note: I am talking about actual coding namespaces, not the conceptual namepsaces used internally by EF.
I was also wondering if having this (the x86 vs 2010 ide) beside my old one (x64 vs 20080 ide) would pose any problems? It seems to be working ok, I just wanted to make sure I hadn't missed announcements saying I had to de-install one before installing the other.
View 2 Replies