.net - Update Non-scalar Entity Properties In EF 4.0?
Apr 27, 2010
At first I was using this as an extension method to update my detached entities...
Public Sub AttachUpdated(ByVal obj As ObjectContext, ByVal objectDetached As EntityObject)
If objectDetached.EntityState = EntityState.Detached Then
Dim original As Object = Nothing
[code]....
Everything has been working great until I had to update non-scalar properties. Correct me if I am wrong but that is because "ApplyCurrentValues" only supports scalars. To get around this I was just saving the FK_ID field instead of the entity object relation. Now I am faced with a many to many relationship so its not that simple. I would like to do something like this...
Dim Resource = RelatedResource.GetByID(item.Value)
Condition.RelatedResources.Add(Resource)
But when I call SaveChanges the added Resources aren't saved. I started to play around with self-tracking entities but it seems they cannot be serialized to ViewState and this is a requirement for me.how to either save my many to many relationships or serialize self-tracking entities?
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Jul 22, 2009
I want to update an entity without loading the entity from the database first. I've accomplished this but only by knowing all of the entities properties and then using the "attachto" method. My issues is i don't want my app to need to remember all of the properties. Example:
[Code]....
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Dec 22, 2011
I have Customers table in a database. I'd like to create List of CustomerNames using entity framework 4.1. How can I do that in Visual Basic?
Dim customerNames = (From c In _context.Customers
Select New With {c.CustomerName}).ToList()
brings a list of anonymous objects.
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Nov 8, 2009
I am trying to update a table. I am trying to add the value 1 to the cells the user querys, i.e.,
user enters 1124
I want to add 1 to all of the cells the AccntRep = 1124
I am receiving this error
"Additional information: Must declare the scalar variable "@RepNo""
I get the the value the user enters and store it in the variable RepNo
'Query to return tuples of AccntRep
Me.CustomerContactsTableAdapter.Search(Me.CompanyDatabaseDataSet.CustomerContacts, New System.Nullable(Of Double)(CType(RepNoToolStripTextBox.Text, Double)))
'Get value from Query Box
Dim RepNo As String
RepNo = RepNoToolStripTextBox.Text
[Code] .....
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Apr 21, 2011
I have an Entity (Extensions) with a number of properties (e.g. id, extension, prefix) and a few navigation properties (phones_departments, phones_buildings) - they show up in the order they display in the EDMX...but what if I want them to display in a different order
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Apr 27, 2012
I'm trying to update a specific record based off of a users selection. Regarding Entity Framework syntax, I'm not very familiar. Is it possible to achieve this SQL statement in Entity FrameWork?
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Mar 31, 2011
I would like to update a row like this:
update [approvers] set approvalstatus = True Where approvalstatus = False and bookingID = @bookingid and approveremail = @email
Using the entity framework.
I have my query which should deliver the item like so:
Dim db As New Model.Entities
Dim approvers = From a In db.approvers Where a.ApprovalStatus = False And a.BookingID = BookingID And a.ApproverEmail = UserName Select a.ApprovalStatus
How do I next target this record for update, so that I can set a.approvalStatus = True then commit these changes to the db?
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Sep 2, 2009
I'm trying to update one value of a compound primary key from within the entity framework and I'm getting this error: "The property 'CustomerID' is part of the object's key information and cannot be modified. "[code]...
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Mar 7, 2012
I have 2 tables in my DB: "Competitions" and "CompetitionAnswers". Each competition will always have 3 answers. I want to be able to edit the Competition and CompetitionAnswers for the same view. I have managed to get the view to work by using editor templates So this is my editor template:
[Code]...
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Nov 15, 2011
I've got a class that closely resembles one of my entities (I use the class for JSON de/serialization because the entity fails conversion to JSON, one of the known gotchyas of JSON + MVC).Once I deserilize a JSON string into my object, is there a way to automatically update the associated Entity model instance. The property names are the same.
'myDeserialized is the deserialized JSON object coming over the wire
Dim entityInstance As DLL.Person = db.getPersonById(myDeserialized.id)
myDeserialized.update(entityInstance)
[code].....
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Aug 29, 2011
How to update the existing Customer object, Insert new Computer object and Add new WorkOrder using entity framework? [code]
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May 21, 2012
I am working on a silverlight project in which i am using the entity data model. I have a consol application in the same solution through which i am creating the database table at runtime. Now when i moves to silverlight page i need to update those newly created database table in the entity data model. Is there any way to update model at runtime.
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Apr 6, 2011
I have a GridView that is tied to an EntityDataSource. Most columns are normal bound columns, but two are itemtemplates. When I attempt a delete on one of the rows I receive the following message:
"A property named 'Building1.building_name' was not found on the entity during an insert, update, or delete operation. Check to ensure that properties specified as binding expressions are available to the data source."
I'm not sure how it is possible that this isn't available, since it displays the element just fine when I'm just viewing - it just throws the error when I attempt deleting a row?
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Apr 9, 2011
I have the following LINQ-to-Entities query:[code]This will give me all the resident assignments for the current year/term. Then I have this LINQ-to-Entities query:[code]This will give me all the rooms. I want to iterate through the assignments and based on what room is assigned update the occupancy in reset_occupancy. I'm not 100% sure how to accomplish this. Here is my pseudo code of what I want to accomplish:[code]
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Dec 15, 2009
I have the following LINQ-to-Entities query:
' Get all the residency assignments that match the term/year.
Dim assignments = From p In dbContext.Residents _
Where p.semester = term _
[code].....
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Jul 20, 2009
I want to build a MVC helper function for which I pass a Entity Framework object and have it build a select. Generally speaking I tried something like this:
Public Function RenderSelect(ByVal helper As HtmlHelper, ByVal sSelectName As String, ByVal aItmes As Array, Optional ByVal sTitleKeyName As String = "name", Optional ByVal sValueKeyName As String = "id") As String
' open select
[Code].....
However, it isn't working. It would be great to have a way to do this and pass the current entity object.
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Oct 26, 2010
Dynamic Object Properties in a MVC Helper on a Entity Framework object
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Jul 27, 2011
I am trying to build a survey engine from an existing database design which is like this.
[Code]...
The line Order By Key.RecordOrder throws a null reference exception and I can understand why. Can someone advise on how to resolve this by just modifying this one query? I am fairly new to LINQ and the necessity to write this project
[Code]...
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Dec 14, 2011
Entity Splitting: one class, two or more tables.Here is how it is done in C#, but I need to get it working in vb.net.One more thing: the class name and table columns do not match, so I have to be able to map that out, too.I have to get this to work this way because the place I'm working at right now is a vb.net only shop and the database schema is fubar, but they have so much (millions) of lines of code done directly against the database in both asp classic, vb.net, AND asp.net webforms that changing the schema right now is not realistically possible.
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<Post>()
.Map(m =>
[code]....
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Jan 16, 2011
I am trying to jump from ASP Classic to asp.net. I have followed tutorials to get Entity Framework and LINQ to connect to my test database, but I am having difficulties figuring out ExecuteQuery(). I believe the problem is that I need an "entity class" for my database, but I can't figure out how to do it. Here is my simple code:
Dim db as New TestModel.TestEntity
Dim results AS IEnumerable(OF ???) = db.ExecuteQuery(Of ???)("Select * from Table1")
From the microsoft example site, they use an entity class called Customers, but I don't understand what that means.
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Feb 11, 2011
I am trying to create a generic typed class, but am running into a problem. Here is my basic class definition:
public class QueueObject<T> where T : System.ServiceModel.DomainServices.Client.Entity
{
public string LoadingMessage { get; set; }
public System.ServiceModel.DomainServices.Client.EntityQuery<T> Query { get; set; }
}
I am trying to add instances of this class to a queue
private Queue<QueueObject<Entity>> _queue;
this._queue.Enqueue(new QueueObject<MyEntity> {Query = MyContext.GetMyEntitiesQuery(), LoadingMessage = "Loading some stuff"});
This doesn't work. I get an error saying that QueueObject cannont be converted to QueueObject. I don't understand because MyEntity inherits from Entity.
Public Class QueueObject(Of T As System.ServiceModel.DomainServices.Client.Entity)
Public Property LoadingMessage As String
Public Property Query As System.ServiceModel.DomainServices.Client.EntityQuery(Of T)
End Class
[code]....
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Feb 17, 2012
My.settings Properties are Read-Only. How can these be updated in program code?
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Dec 7, 2010
I am declaring an IList:
Dim OrigVendors as IList
OrigVendors = new List( of IVendors)
I populate the OrigVendors variable and what I want to do is find all the objects that have the ID I am looking for. Then I need to update a property on that object for only the ones found. Is this do able with an IList or do I need to use some other type of collection? I am using VB.net.
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Jan 4, 2010
I am using a loop to update properties of each object of a set of custom objects. The routine knows which controls to update because the controls value is not empty, I don't want the routine setting the corresponding properties to nothing when the control is empty. Now I know how to do this perfectly fine with IF statements such as:
CODE:
But this feels really redundant doing that same IF block over and over for each property/control combination, I thought about creating a separate routine that takes the control as an argument and does all the repetitive IF blocks but I don't know how I could also pass an object property to tell the routine to update that particular property.
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Oct 5, 2011
I have a problem with this program
Form1.vb
Imports System.ComponentModel<br/><br/>Public Class Form1
Public Delegate Sub updatePB(ByVal value As Integer)
Private bgworker As BackgroundWorker = New BackgroundWorker
[code]....
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Oct 21, 2011
I have been debugging my code for a while and looking at posts in other forums, but it seems to be that everyone has a different problem than mine and what works for them will not work for me.My dropdown list is supposed to filter a gridview by choosing all the Companies that are associated to a certain product. The solution I have found online is that most people did not have DataKeyNames set in their gridview. I do have this set, but not to CompanyID. It wouldn't make any sense. So I have no idea what I am supposed to do since this is the only answer I have found.
<asp:DropDownList ID="ddlCompany" runat="server" DataSourceID="dsCompanyFilter"
DataTextField="CompanyName" DataValueField="CompanyID" AppendDataBoundItems="true"
AutoPostBack="true">
[code]....
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Apr 20, 2011
I have one scalar value function defined in sql database.It accespts 2 parameters and return an integer.Can anyone please help how to call UDF from vb.net using oledeb?
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Jan 9, 2012
Must Declare Scalar Variable @ID?
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May 16, 2012
This seems so basic but I've been struggling to find a solution! I have a web page that take user data from aspx textboxes. Upon hitting a button, the click event submits the responses to a SQL table. Seems easy.I'm using VS10, dev express and VB code. I have established my datacontext class using LinqToSql...In a nutshell, the code is as follows...within the click eventNote that "database" was earlier defined as my datacontext sql connection, "Request" tablee
Dim vname As String = AspxTextbox1.Text
database.executecommand("INSERT INTO [Requests] (ContactName) Values (@vname)")
[code].....
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Apr 6, 2010
im having this prob, when deleting a line from my gridview, this error shows out.Must declare the scalar variable "@productid".Well, i dont know whats wrong with the coding. As i have already declared the productid.
<table style="width:100%;">
<tr>
<td class="style24" colspan="2">
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
[code]....
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