Accessing mainframe DB2 in Java.

Hello,

I am a mainframe Cobol programmer (yes - Cobol programmers are still
around, mostly in caves) and I am writing a java code to access DB2.
In a Cobol world after each SQL command we are checking for return
conditions like success (sqlcode=0), not found (sqlcode = +100),
duplicates (sqlcode=803) and more.
How do you check for this conditions in Java?

Thanks,

Zalek