CODEWITHSUNDEEP
c#linqlinq-to-sql
majid
majid

Reputation: 79

How do I convert this sql to a linq query?

How do I convert the following query into linq to sql query?

    select 
invoice.id, web_users.id, web_users.first_name, web_users.last_name,web_users.email_address 
from attendees,web_users
join invoice where attendees.invoice_id=invoice.id and invoice.seminar_id=6 and attendees.web_user_id=web_users.id

this is what I had but it is throwing an error:

from att in context.Attendees
                          from webUsers in context.WebUsers
                          join invoice in context.Invoice
                          on att.InvoiceID equals invoice.ID                          
                          where invoice.SeminarID == seminarId &&
                          webUsers.ID == att.WebUserID                                       
                          select new
                          {
                              webUsers.FirstName,
                              att.InvoiceID                                                       
                          };

Thanks in advance.

Upvotes: 1

Views: 226

Answers (2)

Guffa
Guffa

Reputation: 700740

Start by cleaning up the SQL. Don't mix joins and implicit joins in the query, use explicit joins for both:

select invoice.id, web_users.id, web_users.first_name, web_users.last_name,web_users.email_address 
from attendees
inner join web_users on web_users.id = attendees.web_user_id
inner join invoice on invoice.id = attendees.invoice_id
where invoice.seminar_id = 6

Now I think that it translates:

from att in context.Attendees
join webUsers in context.WebUsers on webUsers.ID equals att.WebUserID
join invoice in context.Invoice on att.InvoiceID equals invoice.ID
where invoice.SeminarID == seminarId
select new {
  webUsers.FirstName,
  att.InvoiceID                                                       
};

Upvotes: 1

ysrb
ysrb

Reputation: 6740

Try:

from att in context.Attendees
                          join webUsers in context.WebUsers
on att.web_user_id equals webUsers.id
                          join invoice in context.Invoice
                          on att.InvoiceID equals invoice.ID                          
                          where invoice.SeminarID == seminarId                                       
                          select new
                          {
                              webUsers.FirstName,
                              att.InvoiceID                                                       
                          };

Upvotes: 1

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