开发学院网页设计JavaScript update的关联表批量更新 阅读

update的关联表批量更新

 2010-09-14 13:33:14 来源:WEB开发网   
核心提示:在更新一批记录时使用如下语句:update publishset contentid=(select top 1 articles.contentid from articleswhere articles.articleID=publish.objectID)--where publish.objectid=@obj

在更新一批记录时使用如下语句:

update publish set contentid=
(select top 1 articles.contentid from articles
where articles.articleID=publish.objectID
)
--where publish.objectid=@objectID

前提是:publish表的记录不能大于Article的记录,即要插入的目标表中示能插入null,否则会提示错误。

全来没办法,改为游标:

SET NOCOUNT ON
DECLARE @contentID int
declare @objectID int
declare @countnumber int
set @countnumber=0
DECLARE publish_cursor CURSOR FOR
  select a.contentid,a.articleID from publish p
  inner join articles a on a.articleID=p.objectID
  where objectid>0 and p.contentid<> a.contentid
  and (p.cellid=160 or cellid=138)
  OPEN publish_cursor
  
  FETCH NEXT FROM publish_cursor
  INTO @contentID,@objectID
  
    WHILE @@FETCH_STATUS = 0
    BEGIN
    print @contentID
    print @objectID
    
      --修改记录
      update publish set ContentID=@contentID where objectid=@objectID
      --修改结束
      FETCH NEXT FROM publish_cursor into @contentID,@objectID
      
    END
  CLOSE publish_cursor
  DEALLOCATE publish_cursor
  
GO
  
select p.publishid,p.contentid,a.contentid,p.objectID,a.articleID from publish p
inner join articles a on a.articleID=p.objectID
where objectid>0 and p.contentid<> a.contentid
and (p.cellid=160 or cellid=138)
go
  
-- update publish set contentid=0 where (cellid=160 or cellid=138)
-- select * from publish p where ( p.cellid=160 or cellid=138)

在没有更好的办法呢?

其实还可以这样:

update publish set contentid= a.contentid
from articles a inner join publish p on p.objectID=a.articleID
where cellid=138
  
-- select * from publish where cellid=138
-- update publish set contentid=0 where cellid=138

Tags:update 关联 批量

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