SQL Server游标

 --5.利用游标更新删除数据 
 ---游标更新删除当前数据
---1.声明游标
declare orderNum_03_cursor cursor scroll
for select OrderId ,userId from bigorder where orderNum='ZEORD003402'
--2.打开游标
open orderNum_03_cursor
--3.声明游标提取数据所要存放的变量
declare @OrderId int ,@userId varchar(15)
--4.定位游标到哪一行
fetch First from orderNum_03_cursor into @OrderId,@userId  --into的变量数量必须与游标查询结果集的列数相同
while @@fetch_status=0  --提取成功，进行下一条数据的提取操作 
 begin
   if @OrderId=122182
     begin
     Update bigorder Set UserId='123' Where Current of  orderNum_03_cursor  --修改当前行
     end
   if @OrderId=154074
      begin
      Delete bigorder Where Current of  orderNum_03_cursor  --删除当前行
      end
   fetch next from orderNum_03_cursor into @OrderId ,@userId  --移动游标
 end

 --示例2
declare @id char(50)
declare @names char(50)
declare @age int
set @age=27
declare @ages int
declare cur_name cursor for --声明游标
select id,names,age from table_name
open cur_name    --打开游标
fetch next from cur_name into @id,@names,@ages  --获取游标的下一行
while @@FETCH_STATUS=0    
begin
if @age=@ages
begin
    delete from table_name where ages=@ages        --执行删除操作
end
fetch next from cur_name into  @id,@names,@ages  --获取游标的下一行
end
close cur_name        --关闭游标
deallocate cur_name        --释放游标