将varbinary字段编辑为varchar，然后作为varbinary插回

Question

我需要获取varbinary（max）字段并将该字段的内容替换为varchar（max），然后我需要将更改作为varbinary（max）插入到列中。我认为最好的方法是使用游标。这是我的，但我不知道如何更新回varbinary（最大）...任何帮助将不胜感激

declare @content_id int
declare @content varchar(max)

declare cur cursor for 
    select d.content_id, CAST(d.content as varchar(max)) as content from item as a
        join assignment as b on b.itm_id = a.itm_id
        join attachment as c on c.att_id = b.att_id
        join digitalassetcontent as d on d.content_key = c.content_key
            where c.att_type like 'text%';
Open cur

fetch next from cur into @content_id,@content
while(@@FETCH_STATUS=0)

begin
update digitalassetcontent
SET content = replace(content, '<STYLE>H1{font-weight:bold}H1{font-size: 14pt}OL</STYLE><H1>Product Description</H1><P>', '') 
where content_id = @content_id

fetch next from cur into @content_id,@content
End

close cur
deallocate cur