Question

I have a table called Foo and I have two columns: Lorem and Ipsum, so the scheme of the table is:

Foo(Lorem, IpsumID)

I also have a table called IpsumTypes, which looks like this:

IpsumTypes(IpsumID, IpsumName)

I would like to write a LINQ query which will have the following result:

Headers: Lorem, IpsumName1, IpsumName2, …, IpsumNamen
Values: Loremi, count(IpsumName1), …, count(IpsumNamen)

Each row represents a group of Lorem value and the number of each possible IpsumID in the group. New rows can be added to the IpsumTypes table, rows can be deleted too, so I need dynamically generated columns, because at the time of writing the code I’m not aware of the possible values of Ipsum. How can I achieve this? Is there a magical Linq query which solves this problem, or should I get the values from the database and parse them separately, if speed counts?

Thank you in advance for your responses.

Answer 1

This query gets the values you want out of the database. From there, you can project into xml or some other dynamic shape that your program can understand.

from foo in Foo
let name = foo.IpsumType.IpsumName
group foo by new
{
  Lorem = foo.Lorem,
  Name = name
} into g
select new
{
  Lorem = g.Key.Lorem,
  Name = g.Key.Name,
  Count = g.Count()
};