I have problem, I need to explode my input to my stored procedure, but don't know how I can do it.
My stored procedure has a VARCHAR(256) input which I need to split and generate insert statements.
i what to explode this varchar "1,2,3,7,8,9" so I need to split that string on "," and iterate through the result
Yes, please see this forum thread on replicating the functionality in mysql that tsql provides.
That thread also discusses some of the downfalls of this method. Also, I think you want to be using VARCHAR(255) or just VARCHAR(MAX) because there is no benefit to a 256, it uses a 2 byte size prefix and yet only stores 256 characters.
Have you considered using xml and xpath syntax to extract the values instead? I think going forward this will become a more readable and maintainable method.