fix bind values in insert statements

lib/arel/visitors/mysql.rb

@@ -55,18 +55,18 @@ module Arel
         collector = visit o.relation, collector
 
         unless o.values.empty?
-          collector << "SET "
+          collector << " SET "
           collector = inject_join o.values, collector, ', '
         end
 
         unless o.wheres.empty?
-          collector << "SET "
+          collector << " WHERE "
           collector = inject_join o.wheres, collector, ' AND '
         end
 
         unless o.orders.empty?
-          collector << "ORDER BY "
-          collector = inject_join o.wheres, collector, ', '
+          collector << " ORDER BY "
+          collector = inject_join o.orders, collector, ', '
         end
 
         if o.limit

lib/arel/visitors/to_sql.rb

@@ -178,13 +178,17 @@ module Arel
       def visit_Arel_Nodes_Values o, collector
         collector << "VALUES ("
 
-        collector << o.expressions.zip(o.columns).map { |value, attr|
+        len = o.expressions.length - 1
+        o.expressions.zip(o.columns).each_with_index { |(value, attr), i|
           if Nodes::SqlLiteral === value
-            value
+            collector = visit value, collector
           else
-            quote(value, attr && column_for(attr))
+            collector << quote(value, attr && column_for(attr)).to_s
           end
-        }.join(', ')
+          unless i == len
+            collector << ', '
+          end
+        }
 
         collector << ")"
       end