CODEWITHSUNDEEP
asp.net-mvcsql-server-2008entity-framework-corepagination
Konstantin
Konstantin

Reputation: 251

Paging with Entity Framework 7 and SQL Server 2008

I'm trying to use paging (that is .Skip(...).Take(...) in Entity Framework 7. It works OK with Microsoft SQL Server 2012 and 2014, but fails with the following error on SQL Server 2008:

System.Data.SqlClient.SqlException (0x80131904): Incorrect syntax near 'OFFSET'. Invalid usage of the option NEXT in the FETCH statement.

I've figured out that it is a breaking change in EF version 6.1.2 (http://erikej.blogspot.com/2014/12/a-breaking-change-in-entity-framework.html). But the fix is to modify EDMX file setting ProviderManifestToken attribute to "2008".

The problem is that EF7 currently only supports code-first scenario, thus there is no any EDMX out there. The question is: how to configure ASP.NET 5 website with Entity Framework 7 to use fallback pagination approach for SQL Server older than 2012?

Upvotes: 24

Views: 13654

Answers (7)

Yehor Androsov
Yehor Androsov

Reputation: 6152

This feature was removed in EF Core 3.x, UseRowNumberForPaging is marked as obsolete. However, you can use EfCore3.SqlServer2008Query package instead. There are 2 packages available in Nuget, one for >= .NET 5.0, other one is for >= .NET 3.1

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Usage:

 services.AddDbContext<MyDbContext>(o => 
       o.UseSqlServer(Configuration.GetConnectionString("Default"))
        .ReplaceService<IQueryTranslationPostprocessorFactory, SqlServer2008QueryTranslationPostprocessorFactory>());

Upvotes: 5

Ali Besharati
Ali Besharati

Reputation: 1046

Here, just set UseRowNumberForPaging() in ConfigureServices

services.AddDbContext<CallcContext>(options => 
options.UseSqlServer(Configuration.GetConnectionString("Connectionstring"),opt=> { opt.UseRowNumberForPaging(); }));

Upvotes: 0

Salman Taj
Salman Taj

Reputation: 46

MyDbConnectionString is Connection string from any source

protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
{
    optionsBuilder.UseSqlServer(_config["MyDbConnectionString"], 
                options=>
                {
                    options.UseRowNumberForPaging();
                });
}

UseRowNumberForPaging() solved issue in any case except for edmx file scenario.

Upvotes: 2

Belen Martin
Belen Martin

Reputation: 697

You need to use something like this : 

var MinPageRank = (pageIndex - 1) * pageSize + 1;
var MaxPageRank = (pageIndex * pageSize);

var person = _context.Person.FromSql($"SELECT * FROM (SELECT [RANK] = ROW_NUMBER() OVER (ORDER BY Surname),* FROM Person) A WHERE A.[RANK] BETWEEN {MinPageRank} AND {MaxPageRank}").ToList();

IQueryable<Person> PersonIQ = from s in person.AsQueryable() select s;
Person = await PaginatedList<Person>.CreateAsync(PersonIQ .AsNoTracking(), pageIndex ?? 1, pageSize, sourceFull);

Upvotes: 1

Simon Ordo
Simon Ordo

Reputation: 1667

It's broken in RC 1. Gotta wait to get RC 2.

https://github.com/aspnet/EntityFramework/issues/4616

Upvotes: 4

Joe Audette
Joe Audette

Reputation: 36686

I encountered this problem myself using EF 7 and sql server 2008. Fortunately in the latest rc1 version of EF 7 you can solve this by using .UseRowNumberForPaging() as shown in this example:

services.AddEntityFramework()
  .AddSqlServer()
  .AddDbContext<YourDbContext>(options =>
     options.UseSqlServer(configuration["Data:DefaultConnection:ConnectionString"])
                    // this is needed unless you are on mssql 2012 or higher
                    .UseRowNumberForPaging()
                );

Upvotes: 16

mesut
mesut

Reputation: 2177

If you use Edmx file, you must open the edmx file using XML Editor and change 

ProviderManifestToken="2012" ==> ProviderManifestToken="2008"

in line 7.

Please take a look at this blog post for more information: http://erikej.blogspot.com.tr/2014/12/a-breaking-change-in-entity-framework.html

Upvotes: 43

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