Multiple persistence Unit

[tanvirtonu]

I m new in java persistence api. I have made an application with netbeans6.5 using JPA.Now I m running well with one database but i need to use more database schemas in my application.How can I dynamically change my persistence unit at run time.SO that it starts with a perticular persistence unit that i want.I m using mysql and toplink persistence provider.I just need to change my database schema name in my persistence unit file.Every other details are same.