产品自动增量

问题描述

亲爱的所有



请告诉我。



如何制作自动增量产品明智的商品代码数字



我必须将记录保存到数据库，因为我有10个产品（ Milk ， Dairy ， Fresh Juice ）。现在，在我输入产品详细信息的初始过程中，假设我必须存储 MILK的值我输入了所需的详细信息，现在我想在数据库中找到一个 ITEM CODE 下次输入<$ c $的详细信息时，应将值存储为增量计数器（ MIL 100 ） c> MILK ITEM CODE 应自动存储为 MIL002 。乳制品，鲜榨果汁等的情况也是如此......



例如

Dear ALL

Please tell me.

How to make Auto Increment Product wise Item code Number

I have to store record to database as I have 10 products (Milk, Dairy, Fresh Juice). Now during the initial process when I enter the product details let say i have to store value for a MILK I put in the required details, now I want that in the database a ITEM CODE value should be stored as a increment counter (MIL 100) next time when I enter details for MILK the ITEM CODE should be automatically stored as MIL002. Same is the case with Dairy, Fresh Juice, etc...

For Example

Item Code
MIL100
DAI100
FRE100
FRE101
MIL101
FRE102
DAI101

推荐答案

DECLARE @items TABLE (ItemID INT IDENTITY(1,1), CategoryName VARCHAR(30), CategoryID INT, CategorySID VARCHAR(30))

--insert initial values
INSERT INTO @items (CategoryName, CategoryID, CategorySID)
VALUES('MILK', 5, 'MIL005'), ('JUICE', 15, 'JUI015'), ('DAIRY', 1, 'DAI001'),
    ('RTV', 105, 'RTV105'), ('VEGETABLES', 30, 'VEG030'), ('BREAD', 7, 'BRE007')

SELECT *
FROM @items

--Stored procedure input parameter: CategoryName
DECLARE @cn VARCHAR(30) = 'MILK'
DECLARE @cid INT

SELECT @cid = MAX(COALESCE(CategoryID,0)) +1
FROM @items
WHERE CategoryName = @cn

INSERT INTO @items (CategoryName, CategoryID, CategorySID)
SELECT @cn AS CateogryName,  @cid, CONCAT(LEFT(@cn, 3), SUBSTRING('000', 1, 3-LEN(CONVERT(VARCHAR(3),@cid))), CONVERT(VARCHAR(3),@cid)) AS CategorySID

SELECT *
FROM @items
WHERE ItemID = @@IDENTITY

SET @cn = 'JUICE'

SELECT @cid = MAX(COALESCE(CategoryID,0)) +1
FROM @items
WHERE CategoryName = @cn

INSERT INTO @items (CategoryName, CategoryID, CategorySID)
SELECT @cn AS CateogryName,  @cid, CONCAT(LEFT(@cn, 3), SUBSTRING('000', 1, 3-LEN(CONVERT(VARCHAR(3),@cid))), CONVERT(VARCHAR(3),@cid)) AS CategorySID

SELECT *
FROM @items
WHERE ItemID = @@IDENTITY

返回值：

1.查询 - 初始值

Returned values:
1. query - initial values

1	MILK	5	MIL005
2	JUICE	15	JUI015
3	DAIRY	1	DAI001
4	RTV	105	RTV105
5	VEGETABLES	30	VEG030
6	BREAD	7	BRE007

2.查询 - 已添加MILK项目

2. query - MILK item has been added

7	MILK	6	MIL006

3.查询 - 已添加JUICE项目

3. query - JUICE item has been added

8	JUICE	16	JUI016

如你所见，CategorySID已根据增加CategoryName 。



SP应如下所示：

As you can see, CategorySID has been increased depending on CategoryName.

SP should looks like:

CREATE PROCEDURE InsertNewItemByCategory
    @CategoryName VARCHAR(30)
AS
BEGIN
    DECLARE @sid INT

    SELECT @sid = MAX(COALESCE(CategoryID,0))+1
    FROM ItemsTable
    WHERE CategoryName = @CategoryName

    --here put the code to finish SP

END

知道了吗？

Got it?

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