sqlserver 遊標寫法

表結構：People表,PeopleDetail表

 

1.簡單遊標

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.用於更新的遊標　

-- 定義遊標
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
-- 打開遊標
open m_cursor
declare   @Address varchar(50), @Id int
--填充數據
fetch next from m_cursor into @Id,@Address
--假如檢索到了數據，才處理
while @@FETCH_STATUS=0
begin
	update People set  Address=@Address where current of m_cursor
	--填充下一條數據
	fetch next from m_cursor into @Id,@Address
end
-- 關閉遊標
close m_cursor
--釋放遊標
deallocate m_cursor