儲存過程例項

資料庫環境：sqlserver

概述：查詢某個月份的每天的所有資料，然後存到臨時表裡面，再把臨時表裡面的結果集返回。

-- 判斷要建立的儲存過程名是否存在

if exists (select * from dbo.sysobjects where id =object_id(n'[dbo].[sp_dormlevelmonth]') and objectproperty(id, n'isprocedure')= 1)
-- 刪除儲存過程
drop procedure [dbo].[sp_dormlevelmonth]
gocreate procedure sp_dormlevelmonth
@startdate nvarchar(50),@enddate nvarchar(50),@areaid int,@plateid int
asbegin
--宣告乙個游標用來遍歷查詢到的結果
--起止日期中的所有日期的查詢語句
declare mycursor cursor for select convert(char(10),dateadd(day,number,@startdate),120) allday
from master..spt_values
where type = 'p'
and number <= datediff(day,@startdate,@enddate)
--開啟游標
open mycursor
-- 判斷要建立的表名是否存在
if object_id('tempdb..#dormlevelmonth_') is not null
drop table #dormlevelmonth_
--定義臨時表
create table #dormlevelmonth_
(count int,
areaid int,
dormlevelid int,
plateid int,
*** nvarchar(50),
date nvarchar(50)
)--定義乙個用來獲取游標日期的變數
declare @nowdate nvarchar(50)
--獲取游標指向的資料
fetch next from mycursor into @nowdate;
--使用游標遍歷集合
while @@fetch_status = 0
begin 
--定義sql語句
insert into #dormlevelmonth_ select * from
(----合併查詢
select (a.count-isnull(b.count,0)) count,a.areaid,a.dormlevelid,a.plateid,a.***,@nowdate as date from    
--入住人數，分男女0
(select count(1) as count,a.***,convert(char(10),r.registdate,120)date,a.areaid,a.plateid,a.dormlevelid 
from register r 
and convert(char(10),r.registdate,120)<=@nowdate
and a.areaid=@areaid and a.plateid=@plateid 
group by a.***,convert(char(10),r.registdate,120),a.areaid,a.plateid,a.dormlevelid) a
left join 
--退宿人數，分男女
(select count(1) as count,a.***,convert(char(10),r.registdate,120)date,a.areaid,a.plateid,a.dormlevelid 
from register r 
and convert(char(10),r.registdate,120)<=@nowdate
and a.areaid=@areaid and a.plateid=@plateid 
group by a.***,convert(char(10),r.registdate,120),a.areaid,a.plateid,a.dormlevelid) b
on a.areaid=b.areaid and a.dormlevelid=b.dormlevelid and a.plateid=b.plateid and a.***=b.***
and a.date=b.date
) c--游標指向下乙個
fetch next from mycursor into @nowdate;
enddeclare @sql as varchar(200);
set @sql = 'select * from #dormlevelmonth_';
exec(@sql);
--關閉游標
close mycursor;
--釋放游標
deallocate mycursor;
end

--呼叫儲存過程

exec sp_dormlevelmonth '2019-04-01','2019-04-30',1,1

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