SQL Server 游标例子

死siua11

-声明游标
declare my_cursor cursor keyset for select * from info
--删除游标资源
deallocate my_cursor
--打开游标,在游标关闭或删除前都有效
open my_cursor
--关闭游标
close my_cursor
--释放游标
deallocate my_cursor

--声明局部变量
declare @id int,@name varchar(20),@address varchar(20)
--定位到指定位置的记录
fetch absolute 56488 from my_cursor into @id,@name,@address
select @id as id,@name as name,@address as address
--定位到当前记录相对位置记录
fetch relative -88 from my_cursor into @id,@name,@address
select @id as id,@name as name,@address as address
--定位到当前记录前一条
fetch prior from my_cursor into @id,@name,@address
select @id as id,@name as name,@address as address
--定位到当前记录后一条
fetch next from my_cursor into @id,@name,@address
select @id as id,@name as name,@address as address
--定位到首记录
fetch first from my_cursor into @id,@name,@address
select @id as id,@name as name,@address as address
--定位到尾记录
fetch last from my_cursor into @id,@name,@address
select @id as id,@name as name,@address as address
实例：
use database1
declare my_cursor cursor scroll dynamic
/**//*scroll表示可随意移动游标指针（否则只能向前），dynamic表示可以读写游标（否则游标只读）*/
for
select productname from  product
open my_cursor
declare @pname sysname
fetch next from my_cursor into @pname
while(@@fetch_status=0)
begin
print 'Product Name: ' + @pname
fetch next from my_cursor into @pname
end
fetch first from my_cursor into @pname
print @pname
/**//*update product set productname='zzg' where current of my_cursor */
/**//*delete from product where current of my_cursor */
close my_cursor
deallocate my_cursor