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JNDI and lookup() problems in entity beans

 
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Hi,
I have a problem while deploying ejb on j2ee server.I do not know how to use ms sql server as the database instead of cloudscape or oracle.I am having a problem specifying in the "Resources reference Wizard" the coded name field for e.g in one book i checked out they used jdbc/AccountDB as the coded name field and in the JNDI name they used jdbc/Oracle since oracle database is used.
I want to use mssql database where the dsn tht i have created is FINANCE_DSN and database name is finance so how do i specify the coded name field and the JNDI name in my case.

Also while making connection to the database in my ejb code i would like to know the meaning of the following used in some books.
context.lookup("java:comp/env/jdbc/AccountDB")
they claim tht to be the component name or somethin
.How ever i do not understand wht java:comp....
stands for and how do i get a connection to my msssql database using the context.lookup()in my code.
Please give me some explanation to the 2 queries as i am very confused.
 
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