Question

SELECT i.answerc, d.answera, d.answerb
FROM tableone AS u 
INNER JOIN tabletwo AS i ON u.OneId = i.OneId
INNER JOIN tablethree   AS l ON u.TwoId = l.TwoId
INNER JOIN tablefour    AS k ON u.ThreeId = k.ThreeId
INNER JOIN tablefive    AS p ON u.fourId = p.fourId
INNER JOIN tablesix AS d ON u.fiveId = d.fiveId
WHERE u.columnone  = @parameter_one
AND l.columnone = @parameter_two
AND k.columnone = @parameter_three
AND p.columnone = @Parameter_four

I have the Model created, but how I would write this query is confusing me right now? Can anybody help me out here? I had this working using old school SqlConnection but I’ve been told to port it to the Entity Framework 4.

Answer 1

If your tables are not in relations than there is no navigation properties in .edmx file. So your LINQ should be something like this :

var query = from u in context.tableone
    join i in context.tabletwo on u.OneId equals i.OneId  
    join l in context.tablethree on u.TwoId equals l.TwoId 
    join k in context.tablefour on u.ThreeId equals k.ThreeId 
    join p in context.tablefive on u.fourId equals p.fourId  
    join d in context.tablesix on u.fiveId equals d.fiveId
    where u.columnone == parameterONE 
      && l.columnone == parameterTWO
      && k.columnone == parameterTHREE
      && p.columnone == parameterFOUR
    select new { i.answerc, d.answera, d.answerb };

Where parameterXXX are variables.
But if you have navigation properties, you should use them!