// Set up the map object for the back end
        Map<Integer, String> posMap = new HashMap<Integer, String>();
        // Get the approved mailers
        String[] mailerList = request.getParameterValues("approved");
        if (mailerList != null && mailerList.length > 0)
        {
            for(String mailer : mailerList)
            {
                posMap.put(Integer.parseInt(mailer), "Y");
            }
        }
        // reset the mailerList
        mailerList = null;
        // get the ignored mailers
        mailerList = request.getParameterValues("ignored");
        if (mailerList != null && mailerList.length > 0)
        {
            for(String mailer : mailerList)
            {
                posSampleMap.put(Integer.parseInt(mailer), "N");
            }
        }
        // only update POS if the map is not empty
        if(!posMap.isEmpty())
        {
            updateMapper.updatePOSSampling(posMap);
        }

<update id="updatePOSSampling" parameterType="hashmap">
   UPDATE <table_name>
   SET sampling_enabled = ${myMapValue}
   WHERE mailer_name = ${myMapKey}
</update>