diff --git a/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb b/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb
index ae5ae16dc71430452f70fb825a752c04b618dcf3..ef51f5ebca493dbfb2622e0b1e8b3893863a2b97 100644
--- a/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb
@@ -169,7 +169,7 @@ def quote(value, column = nil)
       end
 
       def quote_column_name(name) #:nodoc:
-        @quoted_column_names[name] ||= "`#{name}`"
+        @quoted_column_names[name] ||= "`#{name.to_s.gsub('`', '``')}`"
       end
 
       def quote_table_name(name) #:nodoc:
diff --git a/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb b/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb
index a44ac08ce4397baeed0bbc691a2ee9d4f99a4e2a..b844e5ab1034f7384dd392306b3fd200f4db25f8 100644
--- a/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb
@@ -250,7 +250,7 @@ def type_cast(value, column)
       end
 
       def quote_column_name(name) #:nodoc:
-        @quoted_column_names[name] ||= "`#{name}`"
+        @quoted_column_names[name] ||= "`#{name.to_s.gsub('`', '``')}`"
       end
 
       def quote_table_name(name) #:nodoc:
diff --git a/activerecord/lib/active_record/connection_adapters/sqlite_adapter.rb b/activerecord/lib/active_record/connection_adapters/sqlite_adapter.rb
index 486efc5ba0ca1e4fa1d06d77f705d6381009ef3b..da86957028495c8db8f8c4649b001aa7fd8ced50 100644
--- a/activerecord/lib/active_record/connection_adapters/sqlite_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/sqlite_adapter.rb
@@ -148,7 +148,7 @@ def quote_string(s) #:nodoc:
       end
 
       def quote_column_name(name) #:nodoc:
-        %Q("#{name}")
+        %Q("#{name.to_s.gsub('"', '""')}")
       end
 
       # Quote date/time values for use in SQL input. Includes microseconds
diff --git a/activerecord/test/cases/base_test.rb b/activerecord/test/cases/base_test.rb
index b8ebabfe7094e4e915bb595a6e9c6c4913ddcc5e..fe46c00b47a03feea62ffe2ecff22b5e9b786839 100644
--- a/activerecord/test/cases/base_test.rb
+++ b/activerecord/test/cases/base_test.rb
@@ -67,6 +67,23 @@ def setup
 class BasicsTest < ActiveRecord::TestCase
   fixtures :topics, :companies, :developers, :projects, :computers, :accounts, :minimalistics, 'warehouse-things', :authors, :categorizations, :categories, :posts
 
+  def test_column_names_are_escaped
+    conn      = ActiveRecord::Base.connection
+    classname = conn.class.name[/[^:]*$/]
+    badchar   = {
+      'SQLite3Adapter'    => '"',
+      'MysqlAdapter'      => '`',
+      'Mysql2Adapter'     => '`',
+      'PostgreSQLAdapter' => '"',
+      'OracleAdapter'     => '"',
+    }.fetch(classname) {
+      raise "need a bad char for #{classname}"
+    }
+
+    quoted = conn.quote_column_name "foo#{badchar}bar"
+    assert_equal("#{badchar}foo#{badchar * 2}bar#{badchar}", quoted)
+  end
+
   def test_columns_should_obey_set_primary_key
     pk = Subscriber.columns.find { |x| x.name == 'nick' }
     assert pk.primary, 'nick should be primary key'