SQL语句判断并插入表

Declare @num int

set @num =0

while(@num<9)
begin

    set @num= @num + 1
    if not exists(Select Attrid FROM HVC_Statistics_Setting WHERE Attrid =@num)
    begin
        INSERT INTO HVC_Statistics_Setting(PortalID,AttrID,AttrName,StringValue,FloatValue) 
        VALUES (@PortalID,@num,'','',Case
        When @num=1 then @TotalAccessed
        When @num=2 then @AllArticlesNum
        When @num=3 then @AllArticleHits
        When @num=4 then @MonthTotalUpdated
        When @num=5 then @MonthArticleHits
        When @num=6 then @WeekArticleUpdated
        When @num=7 then @WeekArticleHits
        When @num=8 then @Score
        end)
    end
    else
    begin
    Update HVC_Statistics_Setting SET
    PortalID=@PortalID,
    AttrID=@num,
    AttrName='',
    StringValue='',
    FloatValue= Case
        When  @num=1 then @TotalAccessed
        When @num=2 then @AllArticlesNum
        When @num=3 then @AllArticleHits
        When @num=4 then @MonthTotalUpdated
        When @num=5 then @MonthArticleHits
        When @num=6 then @WeekArticleUpdated
        When @num=7 then @WeekArticleHits
        When @num=8 then @Score
        end
    where Attrid =@num
    end
end