4 files changed, 41 insertions, 8 deletions
diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index ab1eb49286..523a1c4faa 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -1,3 +1,8 @@
+*   Fix mysql2 adapter raises the correct exception when executing a query on a
+    closed connection.
+
+    *Yves Senn*
+
 *   Ambiguous reflections are on :through relationships are no longer supported.
     For example, you need to change this:
 
@@ -5,12 +10,12 @@
         has_many :posts
         has_many :taggings, :through => :posts
       end
-      
+
       class Post < ActiveRecord::Base
         has_one :tagging
         has_many :taggings
       end
-      
+
       class Tagging < ActiveRecord::Base
       end
 
@@ -20,12 +25,12 @@
         has_many :posts
         has_many :taggings, :through => :posts, :source => :tagging
       end
-      
+
       class Post < ActiveRecord::Base
         has_one :tagging
         has_many :taggings
       end
-      
+
       class Tagging < ActiveRecord::Base
       end
 
diff --git a/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb b/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb
index 530a27d099..edeb338310 100644
--- a/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb
@@ -213,9 +213,11 @@ module ActiveRecord
 
       # Executes the SQL statement in the context of this connection.
       def execute(sql, name = nil)
-        # make sure we carry over any changes to ActiveRecord::Base.default_timezone that have been
-        # made since we established the connection
-        @connection.query_options[:database_timezone] = ActiveRecord::Base.default_timezone
+        if @connection
+          # make sure we carry over any changes to ActiveRecord::Base.default_timezone that have been
+          # made since we established the connection
+          @connection.query_options[:database_timezone] = ActiveRecord::Base.default_timezone
+        end
 
         super
       end
diff --git a/activerecord/test/cases/connection_pool_test.rb b/activerecord/test/cases/connection_pool_test.rb
index e6af29282c..d5365b695e 100644
--- a/activerecord/test/cases/connection_pool_test.rb
+++ b/activerecord/test/cases/connection_pool_test.rb
@@ -329,7 +329,7 @@ module ActiveRecord
       end
 
       # make sure exceptions are thrown when establish_connection
-      # is called with a anonymous class
+      # is called with an anonymous class
       def test_anonymous_class_exception
         anonymous = Class.new(ActiveRecord::Base)
         handler = ActiveRecord::Base.connection_handler
diff --git a/activerecord/test/cases/disconnected_test.rb b/activerecord/test/cases/disconnected_test.rb
new file mode 100644
index 0000000000..cc2c1f6489
--- /dev/null
+++ b/activerecord/test/cases/disconnected_test.rb
@@ -0,0 +1,26 @@
+require "cases/helper"
+
+class TestRecord < ActiveRecord::Base
+end
+
+class TestDisconnectedAdapter < ActiveRecord::TestCase
+  self.use_transactional_fixtures = false
+
+  def setup
+    @connection = ActiveRecord::Base.connection
+  end
+
+  def teardown
+    spec = ActiveRecord::Base.connection_config
+    ActiveRecord::Base.establish_connection(spec)
+    @connection = nil
+  end
+
+  test "can't execute statements while disconnected" do
+    @connection.execute "SELECT count(*) from products"
+    @connection.disconnect!
+    assert_raises(ActiveRecord::StatementInvalid) do
+      @connection.execute "SELECT count(*) from products"
+    end
+  end
+end