FingerPrint Comparing And Detecting

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Hi every body,

I want to ask questions.

Before i do, i want to explain what i need or what i am doing.

i need to build a system.The system has database.There are id number, name,last name, their address and some other information like these in the database that belongs to users.

When a user came to my office and want to buy something, first i am checking the user if he/she has any account, any information in my database with his/her fingerprint. I read the fingerprint, got some results and checking in my database.If he/she does, i am adding some information like buying date etc. If he/she doesnt, i need to create a new account and save fingerprint.

So the fingerprint has to give me same result every time i read with same person.

I hope, i could explain. And by the way, i am realy sorry for my bad english.Please for give me :) So, here is my questions.

Can opencv do this?If it can how can i do this?What sould i learn?What i have to do?Can you show me the way to do this?

Thanks a lott.