Question

LINQ insert or query from foreign key

Asked by: veruthandai

Alright, so here is the basic setup. I just want to figure out if I'm missing a huge piece before I keep going. I have two tables (three, truthfully)
Elements
- ElementId
- ElementName

Keys
- KeyId
- KeyValue
- ElementId
- CollectionId

Tags
- TagId
- ElementId
- CollectionId

Elements is a table to store the labels for both keys and tags. ElementName is basically a text field. Both Tags and Keys reference the ElementId to make sure that there are no duplicates of any entry.

Below is a sample of the way I'm doing linq code to try and get this data and use it. I was wondering if there was a cleaner, more logical solution in LINQ.

Key newKey = new Key();
 
			var elementid = from i in Database.Elements
							   where i.Name == "Name"
							   select i.ElementId;
 
			newKey.ElementId = Int32.Parse(elementid.ToString());

                                  
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Asked On
2009-05-01 at 09:13:13ID24372978
Tags

SQL

,

LINQ

Topics

MS SQL Server

,

Language Integrated Query - LINQ

,

C# Programming Language

Participating Experts
2
Points
500
Comments
3

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Answers

 

by: williamcampbellPosted on 2009-05-01 at 11:54:09ID: 24282393

Looks ok may select multiple elements if there are duplicate names

The code below will throw an exception if there are more than one results....


var elementid = Database.Elements.Single<Element>(e => e.ElementName == thename);
                                              
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by: PockyMasterPosted on 2009-05-02 at 00:56:06ID: 24285266

Probably ElementId is an integer already in your database.
newKey.ElementID = Int32.Parse(elementid.ToString());
should become
newKey.ElementID = elementid.Single();

 

by: veruthandaiPosted on 2009-05-03 at 13:13:54ID: 24291106

var elementid = Database.Elements.Single<Element>(e => e.ElementName == thename);

I was wondering, can you explain what is going on here? Specifically what the => is doing? I'm unfamiliar with this operator.

20120131-EE-VQP-002

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