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Entity Framework Core Cookbook

You're reading from   Entity Framework Core Cookbook Transactions, stored procedures, query libraries, and more

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Product type Paperback
Published in Nov 2016
Publisher Packt
ISBN-13 9781785883309
Length 324 pages
Edition 2nd Edition
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Author (1):
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Ricardo Peres Ricardo Peres
Author Profile Icon Ricardo Peres
Ricardo Peres
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Toc

Table of Contents (10) Chapters Close

Preface 1. Improving Entity Framework in the Real World FREE CHAPTER 2. Mapping Entities 3. Validation and Changes 4. Transactions and Concurrency Control 5. Querying 6. Advanced Scenarios 7. Performance and Scalability A. Pitfalls Index

Paging in SQL Server earlier than 2012

Beware if you want to use a SQL Server version earlier than 2012 while doing paging.

Problem

At least two features of Entity Framework Core depend on SQL Server 2012:

  • Using sequences to generate primary keys
  • Using OFFSET for pagination

If we are not using SQL Server 2012 or higher, of course, we cannot use these features. The first one is not a problem since we can use IDENTITY columns or manually assigned identifiers, but the second is the default strategy Entity Framework uses for pagination. Type the following LINQ query:

var pagedBlogs = ctx
  .Blogs
  .Skip(4)
  .Take(5)
  .OrderBy(b => b.CreationDate)
  .ToList();

It will produce SQL similar to this:

SELECT [b].[BlogId], [b].[Name], [b].[CreationDate], [b].[Url]
FROM [Blog] AS [b]
ORDER BY [b].[CreationDate]
OFFSET @__b_0 ROWS FETCH NEXT @__b_1 ROWS ONLY

How to solve it…

This syntax with OFFSET… ROWS FETCH NEXT… ROWS ONLY is only valid for versions of SQL Server equal to or higher...

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