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POEntity Framework Error
 

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  1. POEntity Framework Error
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    <p>I have a little problem. I am encountering the following error each time I try update my entityset.</p> <blockquote> <p>Unable to update the EntitySet 'ShoppingCart' because it has a DefiningQuery and no InsertFunction element exists in the ModificationFunctionMapping element to support the current operation.</p> </blockquote> <p>The code is: `</p> <pre><code>public void AddItem(string cartID, string productID, string quantity) { using (CommerceEntities db = new CommerceEntities()) { try { var myItem = (from c in db.ShoppingCarts where c.CartID == cartID &amp;&amp; c.ProductID == productID select c).FirstOrDefault(); if (myItem == null) { ShoppingCart cartadd = new ShoppingCart(); cartadd.CartID = cartID; cartadd.Quantity = quantity; cartadd.ProductID = productID; cartadd.DateCreated = DateTime.Now; db.ShoppingCarts.AddObject(cartadd); } else { myItem.Quantity += Convert.ToInt32(quantity); } db.SaveChanges(); } catch (Exception exp) { throw new Exception("ERROR: Unable to Add Item to Cart - " +exp.Message); } } } </code></pre> <p>`</p> <p>Please help me. I can provide more information if required, I am new to this Entity Framework Model and following the tutorial on <a href="http://www.asp.net/web-forms/tutorials/tailspin-spyworks/tailspin-spyworks-part-5" rel="nofollow">This page</a>.</p> <p>Update: I added primary keys and redesigned the whole database. Now the error changed to:</p> <blockquote> <p>System.Data.UpdateException was unhandled by user code Message=An error occurred while updating the entries. See the inner exception for details.</p> </blockquote>
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    1. PO
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      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USSamarth Agarwal
    1. USSamarth Agarwal
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    1. PL
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      1. LTLinked
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
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      1. PTAnswer
    1. This table or related slice is empty.
    1. COHave a look at this [thread](http://social.msdn.microsoft.com/Forums/en-US/adodotnetentityframework/thread/220262bd-85d4-4f29-96a8-4a7d1d2c8293) might help you !!!
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      1. POEntity Framework Error
      1. UShuMpty duMpty
    2. COcheck this [thread](http://stackoverflow.com/a/7583791/1551730) it may help
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      1. POEntity Framework Error
      1. USKarthik Chintala
    3. COI added the primary keys on all tables and the problems is there as it is.
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      1. POEntity Framework Error
      1. USSamarth Agarwal
 

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