How convert Linq query to stored procedure

Binumon George 161 Reputation points

Hi All,

     How we can below linq query convert in to  sql  stored procedure query?
  var output = (from c in db.candidates
                              select new
                                  c.LastClicked ,
                                  ProfessionName = c.Profession1.Name,
                                  SpecialtyName = c.Specialty1.Specialty1,
                                  LastPageClicked = db.CandidateBlastListClicks.Where(l => l.CandidateBlastListId == c.ID).OrderByDescending(l => l.UTCDateTime).FirstOrDefault().URL.Replace("", "")

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  1. Bruce ( 35,796 Reputation points

    you don't give the navigation table names or keys, but it would be something like:

    create proc GetCanidates
     c.LastClicked ,
     p.Name as ProfessionName,
     s.Specialty1 as SpecialtyName,
     LastPageClicked = 
         select top 1 replace(URL.'','')
         from CandidateBlastListClicks
         where CandidateBlastListId == c.ID
         order by desc UTCDateTime
    from candidates c
    join Profession p on p.Id = c.Profession1Id
    join Specialty s on s.Id = c.Specialty1Id
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  2. RANKSAPK 0 Reputation points

    To convert a LINQ query to a stored procedure, you'll need to manually create the stored procedure in your database and rewrite the query logic to fit the stored procedure syntax. Here are the general steps to follow:

    Create the stored procedure: Use a database management tool (e.g., SQL Server Management Studio) to create a new stored procedure. Specify the input parameters, output parameters (if any), and the SQL logic that performs the desired query.

    Rewrite the LINQ query logic: Analyze your LINQ query and rewrite it using SQL syntax within the stored procedure. This may involve translating LINQ operators, conditions, joins, and projections into SQL statements such as SELECT, FROM, WHERE, JOIN, and so on.

    Map parameters: In the stored procedure, map the input parameters of the stored procedure to the corresponding SQL parameters. This allows you to pass values from your application to the stored procedure.

    Execute the stored procedure: From your application code, invoke the stored procedure using the appropriate data access framework (e.g., ADO.NET) and pass the necessary parameters. Retrieve and process the results returned by the stored procedure, if any.

    By following these steps, you can convert the logic of your LINQ query into a stored procedure that can be executed directly on the database server. Remember to handle any necessary error handling, security considerations, and performance optimizations as part of this process.

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