sqlserver 游标存储过程实例

--建时间表
CREATE TABLE [dbo].[TIME](
[ID_] [varchar](32) COLLATE Chinese_PRC_CI_AS NULL,
[YEAR_] [varchar](20) COLLATE Chinese_PRC_CI_AS NULL,
[SEASON_] [varchar](20) COLLATE Chinese_PRC_CI_AS NULL,
[MONTH_] [varchar](20) COLLATE Chinese_PRC_CI_AS NULL
) ON [PRIMARY]

GO

---插入数据

declare @sqltext varchar(8000),@id varchar(100),@i int,@beginyear int,@endyear int,@month int,@quarter int,@lenth int
set @month=1
set @beginyear=2000
set @endyear=2010
set @lenth=(@endyear-@beginyear)*12+1
SELECT @i = 1
WHILE(@i<@lenth)
begin
if(@month<4)
set @quarter=1
if(3<@month and @month<7)
set @quarter=2
if(6<@month and @month<9)
set @quarter=3
if(9<@month and @month<13)
set @quarter=4
set @id=convert(varchar(12),@beginyear)+convert(varchar(12),@quarter)
if(@month<10)
set @id=@id+'0'
set @id=@id+convert(varchar(12),@month)
set @sqltext =convert(varchar(12),@id)+''','''+convert(varchar(12),(@month/13+@beginyear))+''','''+convert(varchar(12),@quarter)+''','''+convert(varchar(12),@month)
if @sqltext<>''
begin
set @sqltext='insert into TIME(ID_,YEAR_,season_,MONTH_) values('''+@sqltext+''')';
print @sqltext
exec(@sqltext)
set @sqltext=''
end
select @i=@i+1
if(@month<13)
begin
select @month=@month+1
end
if(@month=13)
begin
select @month=1
select @beginyear=@beginyear+1
end
end

---使用游标
CREATE PROCEDURE updateCursor as
BEGIN
declare @id varchar(20),
@month varchar(20),
@season varchar(20)
declare cur1 CURSOR FOR SELECT ID_,month_ FROM TIME --声明游标变量
OPEN cur1 --打开游标
FETCH cur1 INTO @id,@month --将游标里的ID_,month_赋给变量
WHILE (@@fetch_status=0) ---@@fetch_status 指针：0 FETCH 语句成功;1 FETCH 语句失败或此行不在结果集中;2 被提取的行不存在。
begin
if(@month='1' or @month='2' or @month='3') set @season='第一季度'
if(@month='4' or @month='5' or @month='6') set @season='第二季度'
if(@month='7' or @month='8' or @month='9') set @season='第三季度'
if(@month='10' or @month='11' or @month='12') set @season='第四季度'
update TIME set season_=@season where ID_=@id
FETCH cur1 INTO @id,@month --下一个
END
CLOSE cur1 --关闭游标
deallocate cur1 --释放游标引用
END

--执行
exec updateCursor