ms sql for search-and-replace based on key/value table (not really tested)

    DECLARE @word1 varchar(1000)
     DECLARE @word2 varchar(1000)
     DECLARE word_cursor CURSOR LOCAL fast_forward FOR
     SELECT old_word, new_word FROM word_replace_table

     OPEN word_cursor

     FETCH NEXT FROM word_cursor INTO @word1, @word2

 WHILE @@FETCH_STATUS = 0

 BEGIN


   SET xact_abort ON
   BEGIN tran

   DECLARE @otxt varchar(1000)

   SET @otxt = @word1 /****/
   DECLARE @ntxt varchar(1000)

   SET @ntxt = @word2 /****/

   DECLARE @txtlen int
   SET @txtlen = len(@otxt)

   DECLARE @ptr BINARY(16)
   DECLARE @pos int
   DECLARE @id int
   DECLARE curs CURSOR LOCAL fast_forward
   FOR
   SELECT

   productId,
   textptr(description),
   charindex(@otxt, description)-1
   FROM
   product
   WHERE
   description
   LIKE
   '%' + @otxt +'%'

   OPEN curs

   FETCH NEXT FROM curs INTO @id, @ptr, @pos

   WHILE @@fetch_status = 0

   BEGIN

   print 'Text found in row id=' + cast(@id AS varchar) + ' at pos=' + cast(@pos AS varchar)

   updatetext product.description @ptr @pos @txtlen @ntxt

   FETCH NEXT FROM curs INTO @id, @ptr, @pos

   END

   CLOSE curs

   DEALLOCATE curs

   commit tran

     FETCH NEXT FROM word_cursor INTO @word1, @word2
 END

     CLOSE word_cursor
     DEALLOCATE word_cursor