DECLARE @oldPath varchar(480)
select @oldPath = path from CMS_Categories where CategoryID = @CategoryID
UPDATE CMS_Categories SET Path = STUFF(Path, 1, LEN(@oldPath), @path) where path like @oldPath + '%'
STUFF()函数的用法是将指定字符串（path）从某索引值开始到某索引值这段字符中替换成指定字符串
接下来怎么办呢，只能开游标来解决喽。