存储过程实例

数据库环境：sqlserver

概述：查找某个月份的每天的所有数据，然后存到临时表里面，再把临时表里面的结果集返回。

-- 判断要创建的存储过程名是否存在
if exists (select * from dbo.sysobjects where id =object_id(N'[dbo].[sp_dormLevelMonth]') and OBJECTPROPERTY(id, N'IsProcedure')= 1)
-- 删除存储过程
drop procedure [dbo].[sp_dormLevelMonth]
GO
CREATE PROCEDURE sp_dormLevelMonth
@startDate nvarchar(50),@endDate nvarchar(50),@areaId int,@plateId int
AS
BEGIN
     --声明一个游标用来遍历查询到的结果
     --起止日期中的所有日期的查询语句
     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)
     --打开游标
     open myCursor
     -- 判断要创建的表名是否存在
     if OBJECT_ID('tempdb..#dormLevelMonth_') is not null
     drop table #dormLevelMonth_
     --定义临时表
     create table #dormLevelMonth_
     (
      count int,
      AreaId int,
      DormLevelId int,
      PlateId int,
      Sex nvarchar(50),
      date nvarchar(50)
     )
     --定义一个用来获取游标日期的变量
     declare @nowDate nvarchar(50)
     --获取游标指向的数据
     fetch next from myCursor into @nowDate;
     --使用游标遍历集合
     while @@FETCH_STATUS = 0
     BEGIN 
          --定义sql语句
          insert into #dormLevelMonth_ select * from
          (
          ----合并查询
          select (a.count-ISNULL(b.count,0)) count,a.AreaId,a.DormLevelId,a.PlateId,a.Sex,@nowDate as date from    
          --入住人数，分男女0
          (select COUNT(1) as count,a.Sex,CONVERT(char(10),r.RegistDate,120)date,a.AreaId,a.PlateId,a.DormLevelId 
          from Register r 
          left join Apply a on r.ApplyID=a.ApplyId 
          where a.ApplyType=0 
          and CONVERT(char(10),r.RegistDate,120)<=@nowDate
          and a.AreaId=@areaId and a.PlateId=@plateId 
          group by a.Sex,CONVERT(char(10),r.RegistDate,120),a.AreaId,a.PlateId,a.DormLevelId) a
          left join 
          --退宿人数，分男女
          (select COUNT(1) as count,a.Sex,CONVERT(char(10),r.RegistDate,120)date,a.AreaId,a.PlateId,a.DormLevelId 
          from Register r 
          left join Apply a on r.ApplyID=a.ApplyId 
          where a.ApplyType=1
          and CONVERT(char(10),r.RegistDate,120)<=@nowDate
          and a.AreaId=@areaId and a.PlateId=@plateId 
          group by a.Sex,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.Sex=b.Sex
          and a.date=b.date
          ) c
          --游标指向下一个
          fetch next from myCursor into @nowDate;
     END
     DECLARE @sql AS varchar(200);
     SET @sql = 'select * from #dormLevelMonth_';
     EXEC(@sql);
     --关闭游标
     CLose myCursor;
     --释放游标
     DEALLOCATE myCursor;
END

调用实例：

--调用存储过程
exec sp_dormLevelMonth '2019-04-01','2019-04-30',1,1

结果：