What is the best practice to process the items stocks ?

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what is the best practice to process the items stocks ?

What I have tried:

i searched and i founded two method :

1- Is it better to create a single row for each item (depending on its properties) and increase the stock field in this row or decrease it depending on the process?

C#

--------------------
- item --- stock ---
- x    --- 5    ---
--------------------

b>2-create a row (record) for each operation, ie, if a purchase occurs, a row is created and in the incoming field = 10, and if a sales occurs, outgoing(any other expression) = 5?

C#

----------------------------------
- item --- income --- outgoing ---
- x    --- 10     --- 0       ---
- x    --- 0      --- 5       ---
----------------------------------

i noticed that method 1 cause problem with the stock when i used OnDuplicateKeyUpdate or INSERT IGNORE in MySqlBackup.NET - MySQL Backup Solution for C#, VB.NET, ASP.NET

Posted 9-Jul-19 10:08am

Golden Basim

Updated 9-Jul-19 12:08pm

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MadMyche · Accepted Answer · 2019-07-09T12:08:00

The way I would do it would be to have an inventory table as well as an inventory adjustment table.

SQL

CREATE TABLE dbo.Inventory (
  StockNumber INT  PRIMARY KEY,
  Quantity    INT,
  -- other properties
)
CREATE TABLE dbo.InventoryAdjustment (
  AdjustmentID INT PRIMARY KEY,
  StockNumber  INT,        -- can be indexed or foreign key to Inv.StockNumber
  AdjDate      DATETIME,
  AdjAmount    INT,
  -- other properties
)

And when an adjustment was made, you would do an update on Inventory AND an Insert on InventoryAdjustment

SQL

UPDATE Inventory
SET    Quantity = Quantity + @Adjusment
WHERE  StockNumber = @StockNumber

INSERT InventoryAdjustment (StockNumber, AdjDate, AdjAmount)
VALUES (@StockNumber, GetDate(), @Adjustment)

This will allow you to see the Items and Current stock level with one table, as well as the log of individual adjustments on the item.