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How to get a String randomly?

 
Greenhorn
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I just learned some basic knowledge about jsp&MySql, so I tried my best to do some practice. I designed a login system, and in my register_users table in database, there is one column which is String type, called ru_id, storing value to every register users, so the value in the column should be created automatically and can't not be the same in two of them.

So I want to know how randomly to get the only one String value, in restrict length, during registration in my this login system. Thank you.
 
Marshal
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Moved to the JDBC forum.
 
Bear Bibeault
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Does it have to be a string? Frequently, database sequences are used to generate unique numeric values for use as primary keys.
 
Kidd y.Chen
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That's nice advice, I'll try by myself first, thank you!
 
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