sql - 在sql中可以做到这一点吗？

Question

我要点餐系统

我想这样做，当菜品的所有状态都是“COMPLETE”时，订单自动变为完成

我有4张 table

1 个订单

ID_ORDER:OR00001

状态:处理中/更改自动“完成”

创建日期:17/07/2017

3 道菜

1 道菜 意大利面

编号:PA00001

名称:意大利面米德拉

厨师:杰夫

ID_ORDER:OR00001

状态:进行中

2道菜色拉

编号:SA00001

名称:无糖沙拉

厨师:阿斯顿

ID_ORDER:OR00001

状态:进行中

3 道菜肉

编号:ME00001

名称:肉 BBF

厨师:杰夫

ID_ORDER:OR00001

状态:进行中

这怎么可能？谢谢

CREATE TABLE [dbo].[ORDER](
    [ID_OR] [int] IDENTITY(1,1) NOT NULL,
    [ID_ORDER]  AS ('OR'+right('00000'+CONVERT([varchar],[ID_OR],(0)),(5))),
    [STATUS] [datetime] NOT NULL,
    [CREATION_DATE] [datetime] NOT NULL,
 CONSTRAINT [PK_RR] PRIMARY KEY CLUSTERED 
(
    [ID_ORDER] ASC
)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
END
GO

CREATE TABLE [dbo].[1_DISH](
    [ID_D1] [int] IDENTITY(1,1) NOT NULL,
    [ID_PASTA]  AS ('PA'+right('00000'+CONVERT([varchar],[ID_D1],(0)),(5))),
    [NAME] [varchar](20),
    [CHEF] [varchar](20),
    [STATUS] [datetime] NOT NULL,
    [ID_ORDER] [varchar](20)
 CONSTRAINT [PK_RR] PRIMARY KEY CLUSTERED 
(
    [ID_PASTA] ASC
)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
END
GO

CREATE TABLE [dbo].[2_DISH](
    [ID_D2] [int] IDENTITY(1,1) NOT NULL,
    [ID_SALAD]  AS ('SA'+right('00000'+CONVERT([varchar],[ID_D2],(0)),(5))),
    [NAME] [varchar](20),
    [CHEF] [varchar](20),
    [STATUS] [datetime] NOT NULL,
    [ID_ORDER] [varchar](20)
 CONSTRAINT [PK_RR] PRIMARY KEY CLUSTERED 
(
    [ID_SALAD] ASC
)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
END
GO

CREATE TABLE [dbo].[3_DISH](
    [ID_D3] [int] IDENTITY(1,1) NOT NULL,
    [ID_MEAT]  AS ('ME'+right('00000'+CONVERT([varchar],[ID_D3],(0)),(5))),
    [NAME] [varchar](20),
    [CHEF] [varchar](20),
    [STATUS] [datetime] NOT NULL,
    [ID_ORDER] [varchar](20)
 CONSTRAINT [PK_RR] PRIMARY KEY CLUSTERED 
(
    [ID_MEAT] ASC
)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
END
GO

Answer 1

下面是一些可能对您有所帮助的示例代码。

创建了两个表:一个用于Orders，第二个用于构成订单的Dishes。

我在 Dish 表中添加了一个 DishType 列。 我将 Status 更改为 varchar 数据类型。

declare @ORDERTABLE table 
(
    [ID] [int] IDENTITY(1,1) NOT NULL,
    [STATUS] [varchar](20) NOT NULL,
    [CREATION_DATE] [datetime] NOT NULL
)

declare @DISHTABLE table
(
    [ID] [int] IDENTITY(1,1) NOT NULL,
    [DISHTYPE] varchar(20),
    [NAME] [varchar](20),
    [CHEF] [varchar](20),
    [STATUS] [varchar](20) NOT NULL,
    [ID_ORDER] int
)

插入了一些示例数据。

insert @ORDERTABLE (STATUS, CREATION_DATE) values
('IN PROCESS', getdate()),
('IN PROCESS', getdate());

insert @DISHTABLE (DISHTYPE, NAME, CHEF, STATUS, ID_ORDER) values
('PASTA','PASTA MIDELA','JEFF','IN PROCESS',1),
('SALAD','DIET SALAD','KIA','IN PROCESS',1),
('MEAT','MEAT BBF','BART','IN PROCESS',1),
('SALAD','CAESAR SALAD','KIA','IN PROCESS',2),
('MEAT','ROAST CHICKEN','BART','IN PROCESS',2);

update @DISHTABLE set STATUS = 'COMPLETE' where ID = 1;
update @DISHTABLE set STATUS = 'COMPLETE' where ID = 2;
update @DISHTABLE set STATUS = 'COMPLETE' where ID = 3;

select * from @DISHTABLE;

一种自动更改订单状态的简单方法:每当您更改菜品状态时，检查订单中有多少道菜以及完成了多少道菜。如果所有菜肴都已完成，则将订单状态也更改为完成。

declare @ORDERID int = 1;

update @ORDERTABLE 
    set STATUS = 'COMPLETE' 
where 
    ID = @ORDERID 
    and (select count(*) from @DISHTABLE where ID_ORDER = @ORDERID) = (select count(*) from @DISHTABLE where ID_ORDER = @ORDERID and STATUS = 'COMPLETE');


select 
    o.ID, 
    DISHES = (select count(*) from @DISHTABLE where ID_ORDER = o.ID),
    COMPLETED = (select count(*) from @DISHTABLE where ID_ORDER = o.ID and STATUS = 'COMPLETE'),
    o.STATUS
from @ORDERTABLE o;