Solved

Pivot Sql Table column to a list c#

Posted on 2010-08-13
5
1,982 Views
Last Modified: 2013-12-17

Hi,

I have a question about how to pivot a sql table column into a list of objects.

Assume I have a product table with columns:

product id    location    price
    1                 x             $10
    1                 y             $12
    1                 z             $14

I created a (location, price) class and a product class as:

public class priceLocation
{
      public string location;
      public decimal price;
}

and
public class product
{
      public int productid;
      public list<priceLocation> priceLocations;
}
public list<object> locationprice

How can I load the above sql data to these classes?

Thanks
0
Comment
Question by:sofux
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
5 Comments
 
LVL 5

Expert Comment

by:JayFromPep
ID: 33432685
I think that LINQ would be the way to go.

Check this article....

http://www.c-sharpcorner.com/UploadFile/scottlysle/L2SinCS06022008035847AM/L2SinCS.aspx
0
 

Author Comment

by:sofux
ID: 33433790
I am not sure how it helps.

Let me clarify little bit:

product id    location    price
    1                 x             $10
    1                 y             $12
    1                 z             $14
    2                 x             $15
    2                 y             $17
    2                 z             $13

need to convert this table to create a product list. If I had to do it manually, it would look like this:

list<product> Products = new list<product>
    { new Product{productid = 1, new List<priceLocation>{new priceLocation{location = x, price =10},
                                                                                            new priceLocation{location = x, price =12},
                                                                                            new priceLocation{location = x, price =14}}},
       new Product{productid = 2, new List<priceLocation>{new priceLocation{location = x, price =15},
                                                                                            new priceLocation{location = x, price =17},
                                                                                            new priceLocation{location = x, price =13}}}};

I am familiar with linq but not sure if this can be accomplished with linq.
Thanks.


0
 
LVL 2

Accepted Solution

by:
Algol36 earned 500 total points
ID: 33436629
       public class priceLocation
        {
              public string location;
              public decimal price;
        }

        public class product
        {
              public int productid;
              public List<priceLocation> priceLocations;
        }
        public List<product> locationprice;

        public void Run()
        {
            //create example datatable
            DataTable table = new DataTable();
            table.Columns.Add("productId", typeof(int));
            table.Columns.Add("location", typeof(string));
            table.Columns.Add("price", typeof(decimal));
            table.Rows.Add(1, "x", "10");
            table.Rows.Add(1, "y", "20");
            table.Rows.Add(1, "z", "15");
            table.Rows.Add(2, "x", "10");
            //using linq to extract data into classes
            var query = from prod in table.AsEnumerable()
                        group prod by prod["productId"]
                            into grp
                            select new product
                            {
                                productid = (int)grp.Key,
                                priceLocations = grp.Select<DataRow, priceLocation>(
                                    l => new priceLocation() {
                                        location = (string)l["location"],
                                        price = (decimal)l["price"]
                                        }
                                    ).ToList()
                            };

            locationprice = query.Cast<product>().ToList<product>();
        }
0
 

Author Comment

by:sofux
ID: 33441872
Thanks.

Need to small adjustments but overall it works.

This part of the code didn't work:

grp.Select<DataRow, priceLocation>(
                                    l => new priceLocation() {
                                        location = (string)l["location"],
                                        price = (decimal)l["price"]
                                        }

so I replaced this with:

grp.Select( l => new priceLocation() {
                                        location = l.location,
                                        price = l.price
                                        }

0
 

Author Closing Comment

by:sofux
ID: 33441878
Provided very good direction but further improvements required on my side.
0

Featured Post

Containers & Docker to Create a Powerful Team

Containers are an incredibly powerful technology that can provide you and/or your engineering team with huge productivity gains. Using containers, you can deploy, back up, replicate, and move apps and their dependencies quickly and easily.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Exception Handling is in the core of any application that is able to dignify its name. In this article, I'll guide you through the process of writing a DRY (Don't Repeat Yourself) Exception Handling mechanism, using Aspect Oriented Programming.
It was really hard time for me to get the understanding of Delegates in C#. I went through many websites and articles but I found them very clumsy. After going through those sites, I noted down the points in a easy way so here I am sharing that unde…
Michael from AdRem Software explains how to view the most utilized and worst performing nodes in your network, by accessing the Top Charts view in NetCrunch network monitor (https://www.adremsoft.com/). Top Charts is a view in which you can set seve…
Add bar graphs to Access queries using Unicode block characters. Graphs appear on every record in the color you want. Give life to numbers. Hopes this gives you ideas on visualizing your data in new ways ~ Create a calculated field in a query: …

617 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question