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游标怎样使用(简单点的)解决办法

热度:9032   发布时间:2013-02-25 00:00:00.0
游标怎样使用(简单点的)
我最近要用的游标,但以前没有用过,不知道从何下手啊,请高手来帮帮忙哦

------解决方案--------------------------------------------------------
SQL的游标?

see

DECLARE Employee_Cursor CURSOR FOR
SELECT LastName, FirstName
FROM Northwind.dbo.Employees
WHERE LastName like 'B% '

OPEN Employee_Cursor

FETCH NEXT FROM Employee_Cursor
WHILE @@FETCH_STATUS = 0
BEGIN
FETCH NEXT FROM Employee_Cursor
END

CLOSE Employee_Cursor
DEALLOCATE Employee_Cursor
------解决方案--------------------------------------------------------
第一步:声明游标

关键字(declare) 游标名 关键字(cursor) 关键字(for)

记录集

例如: declare cur_Name Cursor for Select * from TT

第二步

打开游标 : open cur_Name

第四步

提取数据:Fetch Next From cur_Name [ into 变量List ]

第五步

循环提取:Fetch Next From cur_Name

while @@Fetch_Status=0

begin

Fetch Next From cur_Name

end

第六步:关闭释放游标

Close Cur_Name

deallocate cur_Name


例子 :

declare @faSysid int,
@mf varchar(400),
@nv varchar(400)

declare cur_AA cursor for select m_SysID,mdyfield,nvalue from T_AstModify where EntryID= 'DB0605010 '
open cur_AA
Fetch Next From Cur_AA
into @faSysid,@mf,@nv
while @@fetch_Status=0
begin
select @faSysid,@mf,@nv
Fetch Next From Cur_AA
into @faSysid,@mf,@nv
end

close cur_AA
deallocate cur_aa


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