Fetch emails and save in mysql

I'm been working with an windows service to fetch emails (imap) and save them in mysql but every time I save all of them so any one know how get just the doest exist in my database??

any example or how can do this maybe in other way?

Im working with VB.net
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Ryan ChongBusiness Systems Analyst , ex-Senior Application EngineerCommented:
but every time I save all of them so any one know how get just the doest exist in my database??
first, you may try an approach to limit the emails you fetching per your (ETL) job, let's say only fetching for yesterday's emails. second, we need to do a checking in your database insert scripts, before the insert, check for record existence. if exist, you may escape or update it, if not exist, then do the insertion.

hope that make sense.

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theGhost_k8Database ConsultantCommented:
There could be better ways than this but this is something quickly came to my mind:

- make your email field as UNIQUE (add unique key to email)
- to load data use INSERT IGNORE statement.
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Visual Basic.NET

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