How can i use diffrent database for same file in same project?

I want to use two database. First normal environment, second for budget. Second copy from first environment. For example 1. database name = "MRP" , 2. database name = "MRPBUDGET".When program is start, users can select database. My question how can i use which selected database name in program.
Thanks a lot for your help,

Hi giri,
I test it. When i change
cocukRowSet.setDataSourceName("java:comp/env/jdbc/mysql_dogum");
cocukRowSet.setDataSourceName("java:comp/env/jdbc/mysql_dogum1");
in SessionBean1.java
i run it. But this page of project is open explorer it didn't change sun-web.xml and web.xml in projetct directory(line
<resource-ref>
<res-ref-name>jdbc/mysql_dogum</res-ref-name>
<jndi-name>jdbc/mysql_dogum</jndi-name>
</resource-ref>
When i close this page of project from explorer , i clean and build project and then find in project "dogum1", i saw true value in sun-web.xml and web.xml. Project is running true.
How can i change xml file when project running. Can i use drop down list for database name(which change run time)
Thanks,

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