I'm creating entity on a project to use them as data on my website. I got my base simple entity Users and my DataContext. The thing is i would like the database to create the table as i create Entities.
I mean, actually my database doesn't have a Users table and do not generate it as i build and launch the project. I used to be a Java dev and in Java the table can be created with JPA so i guess Microsoft made it possible with ASP.net but how to do? I've looked on the web but didn't find it.
I'm having a question about an update method using SQL To Entities. I'm sending an object to the class and i'm updating him sucefully, but i need to specify each property of object instead of update in once. For example
[Code]....
In this case, i'm updating name, age and country sucefully but i want to use instead of update each property one-by-one, something like this:
[Code]....
So, the C = New should fill the C with all New values on properties, but this isn't work. To update an object, i've to update each property individual or can i update all in one like C = New?
I'm trying to update data with the EF I can't seem to get the EntityKey when I debug and hit this line befor I save changes _entities.ApplyPropertyChanges entityToEdit.EntityKey .EntitySetName, blogEntryToEdit); The EntityKey is null dose anyone have any idea how this key is set can't SaveChanges() without it _entities.ApplyPropertyChanges(entityToEdit.EntityKey .EntitySetName, blogEntryToEdit);
I trying to create a search mechanism for records in a EDM based on text entered on a text box in a web page.
For example, if I enter a partial name of a customer and/or state abrebiation for that customer on the Text Box (abc, TX)s, I want to search name and state fields in a Customer table in my database for matching customers.
I found a solution with the namespaceSystem.Linq.Dynamic, but for some reason it is not working. It does not expose the Search() method. Here is the code I am using to perform the search;
I have a Customer object that has two address ID fields (one for HomeAddress and one for WorkAddress)
I am loading the Address Objects by using Include="HomeAddress, WorkAddress" and then binding to the properties using the Navigation Property on the Customer Entity
Can I use just one FormView for doing the Insert/Updates and binding it to an EntityDataSource or would I have to do all the Inserting/Updating manually?
In Entity framework I have a class which is effectively
fooEntity { public Guid Id {get; set;} and a collection of fooChildEntity } a fooChildEntity is again an entityframework class fooChildEntity { public Guid kidId {get; set;} }
Now I also have a pair of business layer classes foo and fooChild
foo { public Guid Id {get; set;} ilist<fooChild> Children {get;set;} } fooChild { public Guid kidId {get; set;} }
My aim is to write a linq to entites that will allow me to convert the entity foo and children into the business foo and children without breaking deferred execution ( I will be adding filters to reduce the recordset at a higher coding level in the business layer)
doing something like
this.context.fooEntity
.include(fooChildEntity)
.Select( fe => new foo { Id=fe.Id ,
fe.foreach(fec => Children.add( new fooChild { kidId = fec.kidId}))})
.AsIQueryable()
is plainly rubbish and would never compile - it is however an indication of the direction I was thinking .
Even if I got a foreach to work like that or similar it would break deferred execution
At this point there are around 300,000 foo entities which I will eventualy filter to 5 or 6 foo's - this is why deferred execution is needed.
I mean, what is the faster way to get as fast as I can more than one table with stored procedure? Is there any study what is faster and why? There is a big problem getting more than one table at once with Entities, so the only way is DataSet. But I was told DataSet work very slow. Is that true?
I'm having trouble writing what should be a simple sub-query using LINQ to Entities. I have two tables: Customers and Orders that have a relation on the CustID field. Not all Customers have a record in the Orders table, while some have mutiple records. In traditional SQL, you could write the query like this: SELECT * FROM Orders where CustID IN (SELECT CustID FROM Customers) I know this could be done as a JOIN in both SQL and L2E, but my actual query is more complex (about 8-9 joins), so I am hoping to find a L2E sub-query equivalent. Something like this:
[Code]....
I know LINQ to Entities does not support the " IN " clause, so I am looking for something that will work in its place.
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.
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.
I am currently developing some user controls so that I can use them at several places within a project. One control is a about editing a list of addresses for a customer. Since this needs to be done at several places within the project I want to make it a simple user control. The user control contains a repeater control. By default the repeater displays one address item to be edited. If more addresses need to be added, the user can click on a button to append an additional address to be entered. The user control should work for creating new addresses as well as editing existing ones. The address business entity looks something like this:
public class Address { public string Street { get; set; } public City City { get; set; } public Address(string street, City city) { Check.NotNullOrEmpty(street); Check.NotNull(city); Street = street; City = city; } }
As you can see an address can only be instantiated if there is a street and a city.
Now my idea was that the user control exposes a collection property called Addresses.The getter of this property collects the addresses from the repeater and return it in a collection. The setter would databind the addresses to be edited to the repeater.
Like this:
public partial class AddressEditControl : System.Web.UI.UserControl { public IEnumerable<Address> Addresses { get { IList<Address> addresses = new List<Address>(); // collect items from repeater and create addresses foreach (RepeaterItem item in addressRepeater.Items) { // collect values from repeater item addresses.Add(new Address(street, city)); } return addresses; } set { addressRepeater.DataSource = value; addressRepeater.DataBind(); } } }
First I liked this approach since it is object oriented makes it very easy to reuse the control. But at some place in my project I wanted to use this control so a user could enter some addresses. And I wanted to pre-fill the street input field of each repeater item since I had that data so the user doesn't need to enter it all by his self.
Now the problem is that this user control only accepts addresses in a valid state (since the address object has only one constructor). So I cannot do:
IList<Addresses> addresses = new List<Address>(); addresses.Add(new Address("someStreet", null)); // i dont know the city yet (user has to find it out) addressControl.Addresses = addresses;
So the above is not possible since I would get an error from address because the city is null.
Now my question: How would I create such a control? ;) I was thinking about using an Address DTO instead of a real address, so it can later be mapped to an address. That way I can pass in and out an address collection which addresses don't need to be valid. Or did I misunderstood the way user controls work?
I have a dozen dropdowns and each one is bound to an SP. The page was taking much time to load as time times db is getting connected and sps are called.I thought of using a single sp returning multiple recordsets and iterate through each record set.
Ex:create procedure getdeptsemps as begin select * from emp select * from dept end
I am able to iterate through both the result sets using NextResultset but all I need to know is, how I can assign the recordset into multiple entities like Emp and Dept ?I will assign these Emp and Dept into corresponding dropdown lists.
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?
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.
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.
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.
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.
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.
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 ?