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What is the best practice to process the items stocks ?

Golden Basim asked:

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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?

--------------------
- 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?

----------------------------------
- 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
Tags: C#, analysis

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