how to run function once to fill a field programmatically?

I create a new field in deal module and this module will depends on another module. let say I simplify the case like this

1. I need to fetch all the records in deal module that the field 'status' is "Won"

2. if the field 'weight' value is more than 100 then I need to update the field 'condition' to 'overweight' (string) otherwise it will be 'normal' (string)

I need to run the code one time only

my questions are:

1. can I do that using Zoho CRM only, I mean using 'function'? it is okay if it will a 'hack' because as far as I know the 'fuction' can only triggered using workflow or blueprint

2. could you please show me a code to to that, I am a programmer, but not familiar yet to the Zoho API function to be honest.

thank you very much

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