From df5a38fc6aeb8dfaa816fcbe0efb3fe4de169833 Mon Sep 17 00:00:00 2001
From: Tatsuhiko Miyagawa <miyagawa@bulknews.net>
Date: Mon, 12 Nov 2012 13:48:50 -0800
Subject: [PATCH 1/3] MySQL 5.6 and later supports microsecond precision in
 datetime.

You might want to branch it to include this only for 5.6, but
passing these values to < 5.6 doesn't cause issues either.
---
 .../active_record/connection_adapters/mysql2_adapter.rb   | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb b/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb
index b07b0cb826..2b5049f5a5 100644
--- a/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb
@@ -83,6 +83,14 @@ module ActiveRecord
         @connection.escape(string)
       end
 
+      def quoted_date(value)
+        if value.acts_like?(:time) && value.respond_to?(:usec)
+          "#{super}.#{sprintf("%06d", value.usec)}"
+        else
+          super
+        end
+      end
+
       # CONNECTION MANAGEMENT ====================================
 
       def active?

From 5a934e6787337e51d8174669ea0ca6e0c9ea8081 Mon Sep 17 00:00:00 2001
From: Arthur Neves <arthurnn@gmail.com>
Date: Wed, 12 Mar 2014 09:06:12 -0400
Subject: [PATCH 2/3] Test microsecond on mysql 5.6

---
 activerecord/test/cases/base_test.rb | 2 +-
 activerecord/test/cases/helper.rb    | 5 +++++
 activerecord/test/schema/schema.rb   | 6 +++++-
 3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/activerecord/test/cases/base_test.rb b/activerecord/test/cases/base_test.rb
index 8a0b0b9589..6acb342d0b 100644
--- a/activerecord/test/cases/base_test.rb
+++ b/activerecord/test/cases/base_test.rb
@@ -212,7 +212,7 @@ class BasicsTest < ActiveRecord::TestCase
     )
 
     # For adapters which support microsecond resolution.
-    if current_adapter?(:PostgreSQLAdapter, :SQLite3Adapter)
+    if current_adapter?(:PostgreSQLAdapter, :SQLite3Adapter) || mysql_56?
       assert_equal 11, Topic.find(1).written_on.sec
       assert_equal 223300, Topic.find(1).written_on.usec
       assert_equal 9900, Topic.find(2).written_on.usec
diff --git a/activerecord/test/cases/helper.rb b/activerecord/test/cases/helper.rb
index 3758224b0c..8a49dfbb44 100644
--- a/activerecord/test/cases/helper.rb
+++ b/activerecord/test/cases/helper.rb
@@ -41,6 +41,11 @@ def in_memory_db?
   ActiveRecord::Base.connection_pool.spec.config[:database] == ":memory:"
 end
 
+def mysql_56?
+  current_adapter?(:Mysql2Adapter) &&
+    ActiveRecord::Base.connection.send(:version).join(".") >= "5.6.0"
+end
+
 def supports_savepoints?
   ActiveRecord::Base.connection.supports_savepoints?
 end
diff --git a/activerecord/test/schema/schema.rb b/activerecord/test/schema/schema.rb
index 5f2d6acbcb..b44e72a67c 100644
--- a/activerecord/test/schema/schema.rb
+++ b/activerecord/test/schema/schema.rb
@@ -674,7 +674,11 @@ ActiveRecord::Schema.define do
     t.string   :title
     t.string   :author_name
     t.string   :author_email_address
-    t.datetime :written_on
+    if mysql_56?
+      t.datetime :written_on, limit: 6
+    else
+      t.datetime :written_on
+    end
     t.time     :bonus_time
     t.date     :last_read
     # use VARCHAR2(4000) instead of CLOB datatype as CLOB data type has many limitations in

From 2ed1cbba5226a321be48a80f32b6d7fb988ac778 Mon Sep 17 00:00:00 2001
From: Arthur Neves <arthurnn@gmail.com>
Date: Wed, 12 Mar 2014 09:15:46 -0400
Subject: [PATCH 3/3] Changelog entry for mysql56 microseconds

---
 activerecord/CHANGELOG.md | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index 2e4f653ea6..e6c7d74c75 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -1,3 +1,7 @@
+*   Support for Mysql 5.6 Fractional Seconds.
+
+    *arthurnn*, *Tatsuhiko Miyagawa*
+
 *   Support for Postgres `citext` data type enabling case-insensitive where
     values without needing to wrap in UPPER/LOWER sql functions.