2 files changed, 22 insertions, 3 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb b/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb
index 11cd590672..f4885b19d6 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb
@@ -9,7 +9,6 @@ module ActiveRecord
       # Converts an arel AST to SQL
       def to_sql(arel, binds = [])
         if arel.respond_to?(:ast)
-          binds = binds.dup
           visitor.accept(arel.ast, collector).compile binds.dup
         else
           arel
diff --git a/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb b/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb
index 7c8f020065..88c90b06bf 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb
@@ -193,11 +193,31 @@ module ActiveRecord
         @connection_options, @config = connection_options, config
         @quoted_column_names, @quoted_table_names = {}, {}
 
+        @visitor = Arel::Visitors::MySQL.new self
+
         if self.class.type_cast_config_to_boolean(config.fetch(:prepared_statements) { true })
           @prepared_statements = true
-          @visitor = Arel::Visitors::MySQL.new self
         else
-          @visitor = unprepared_visitor
+          @prepared_statements = false
+        end
+      end
+
+      class BindCollector < Arel::Collectors::Bind
+        def initialize(conn)
+          @conn = conn
+          super()
+        end
+
+        def compile(bvs)
+          super(bvs.map { |bv| @conn.quote(*bv.reverse) })
+        end
+      end
+
+      def collector
+        if @prepared_statements
+          Arel::Collectors::SQLString.new
+        else
+          BindCollector.new self
         end
       end