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9.9

LINQ to SQL - 1 to many update / insert

Asked by iziizi in Language Integrated Query - LINQ, C# Programming Language, .NET Framework 3.x versions

Tags: LINQ, SQL, ASP.NET, Update, 1 to many

I have created a simple blog which I am having some issues with. It saves OK, but updating causes an error:

"Server Error in '/' Application.
Violation of PRIMARY KEY constraint 'PK_Blog_CategoryMapping'. Cannot insert duplicate key in object 'dbo.Blog_CategoryMapping'."

I think this is because its trying to insert the same keys again instead of updating the keys.

Please see capture.png for a screen grab of my linq ORM.

See my code snip below for saving.

I think the problem is : be.BlogCategoryMappings.Add(bcm);

What I need to do is delete / update the mappings in CategoryMappings table, not try and insert them again. How is this done?

Thanks in advance

View the Solution FREE for 30 Days

         
           
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             ##SAVE METHOD##
public static void Save(int BlogID, string BlogTitle, string BlogText, DateTime BlogDate, bool Published, Guid AuthorID, bool Deleted,
                                                                bool AllowComments, string MetaTitle, string MetaDescription, string FriendlyURL, List<BlogCategoryMapping> bcml)
        {
            using (BlogDataContext db = new BlogDataContext())
            {
                BlogEntry be;
                bool IsNew = false;
 
                if (BlogID > 0)
                {
                    be = db.BlogEntries.Where(b => b.BlogID == BlogID).FirstOrDefault();
                }
                else
                {
                    be = new BlogEntry();
                    IsNew = true;
                }
 
                be.BlogTitle = BlogTitle;
                be.BlogText = BlogText;
                be.BlogDate = BlogDate;
                be.Published = Published;
                be.AuthorID = AuthorID;
                be.Deleted = Deleted;
                be.AllowComments = AllowComments;
                be.MetaTitle = MetaTitle;
                be.MetaDescription = MetaDescription;
                be.FriendlyURL = FriendlyURL;
 
                foreach (var i in bcml)
                {
                    BlogCategoryMapping bcm = new BlogCategoryMapping();
 
                    bcm.BlogID = i.BlogID;
                    bcm.CategoryID = i.CategoryID;
 
                    be.BlogCategoryMappings.Add(bcm);
                }
 
                if (IsNew)
                    db.BlogEntries.InsertOnSubmit(be);
 
                db.SubmitChanges();
 
                if (IsNew)
                    System.Web.HttpContext.Current.Response.Redirect("~/Administration/Blog.aspx?a=added&id=" + be.BlogID);
                else
                    System.Web.HttpContext.Current.Response.Redirect("~/Administration/Blog.aspx?id=" + be.BlogID);
                
            }
 
        }
           
         

Attachments:

Capture.PNG (30 KB) (File Type Details)

Capture of Linq ORM for blog DB.

20091111-EE-VQP-92 - Hierarchy / EE_QW_3_20080625

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3. sree_ven51,360
4. CodeCruiser46,507
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1. Fernando...616,603
2. naspinski211,485
3. sree_ven51,360
4. CodeCruiser50,957
5. abel38,350
6. TheLearn...31,122
7. novynov21,300
8. sjturner220,250
9. The_eagle19,910
10. Ceiled17,800
11. CarlVerret17,064
12. jinal17,050
13. GuitarRich16,200
14. PockyMas...15,936
15. emoreau14,170
16. Juan_Bar...13,900
17. Dhaest13,872
18. deadlyDev13,500
19. gauthampj11,000
20. reb7310,500
21. kaufmed9,200
22. copyPast...8,600
23. jaime_oliv...8,500
24. GreenGho...8,150
25. BToson8,000
25. p_davis8,000

LINQ to SQL - 1 to many update / insert

Asked by iziizi in Language Integrated Query - LINQ, C# Programming Language, .NET Framework 3.x versions

Tags: LINQ, SQL, ASP.NET, Update, 1 to many

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