sqlserver 游标写法

表结构：People表,PeopleDetail表

 

1.简单游标

declare m_cursor cursor scroll for 
select  Address,PeopleId from  PeopleDetail

open m_cursor
declare   @Address varchar(50), @PeopleId int

fetch next from m_cursor into @Address,@PeopleId
while @@FETCH_STATUS=0
begin
	print @Address + convert(varchar(3), @PeopleId)
	fetch next from m_cursor into @Address,@PeopleId
end

close m_cursor
deallocate m_cursor

2.用于更新的游标　

-- 定义游标
declare m_cursor cursor scroll for 
select a.Id,b.Address from  People a left join PeopleDetail b on a.Id=b.PeopleId
for update
-- 打开游标
open m_cursor
declare   @Address varchar(50), @Id int
--填充数据
fetch next from m_cursor into @Id,@Address
--假如检索到了数据，才处理
while @@FETCH_STATUS=0
begin
	update People set  Address=@Address where current of m_cursor
	--填充下一条数据
	fetch next from m_cursor into @Id,@Address
end
-- 关闭游标
close m_cursor
--释放游标
deallocate m_cursor