Apply monkey patches for SQL Server connections only

[mattbrictson]

Recent versions of Rails support multiple database connections within the same app. It is possible for these connections to use different adapters. For example, one adapter may use SQL Server, and another uses PostgreSQL.

This gem applies some monkey patches to ActiveRecord for SQL Server compatibility. These patches could break other adapters, though, in a multiple-database scenario.

This PR modifies the patches so that they are applied only if the connection is SQL Server. If not, the original ActiveRecord implementation (super) is used instead.

Fixes #929

@aidanharan @wpolicarpo what do you think of this approach? Any suggestions on how to test?

[mattbrictson]

Hmm. Appveyor CI is failing with one failing test, but that same test fails for me locally on main...

On main, running locally:

Failure:
LogSubscriberTest#test_where_in_binds_logging_include_attribute_names [/Users/mattb/.rbenv/versions/3.0.2/lib/ruby/gems/3.0.0/bundler/gems/rails-f94f41dd59b5/activerecord/test/cases/log_subscriber_test.rb:252]:
Expected /\["id",\ 1\],\ \["id",\ 2\],\ \["id",\ 3\],\ \["id",\ 4\],\ \["id",\ 5\]/ to match "Developer Load (2.3ms)  EXEC sp_executesql N'SELECT [developers].[id], [developers].[name], [developers].[salary], [developers].[firm_id], [developers].[mentor_id], [developers].[legacy_created_at], [developers].[legacy_updated_at], [developers].[legacy_created_on], [developers].[legacy_updated_on] FROM [developers] WHERE [developers].[id] IN (@0, @1, @2, @3, @4)', N'@0 bigint, @1 bigint, @2 bigint, @3 bigint, @4 bigint', @0 = 1, @1 = 2, @2 = 3, @3 = 4, @4 = 5  [[\"id\", nil], [\"id\", nil], [\"id\", nil], [\"id\", nil], [\"id\", nil]]".

[aidanharan]

Yeah this fix looks fine to me. The LogSubscriberTest#test_where_in_binds_logging_include_attribute_names test should be fixed already by #931

[wpolicarpo]

Also, could you rebase your branch and add a changelog entry?

[mattbrictson]

@wpolicarpo thanks for the feedback! I think I've addressed all of your concerns:

• Rebased against main
• Changed is_a?(SQLServerAdapter) to adapter_name == "SQLServer"
• Added an Unreleased section to the CHANGELOG with an entry for this PR

I also squashed this PR down to one commit.

Let me know if there is anything else you need.

[wpolicarpo]

All good. Thanks for your contribution.