[antlr-interest] need help command(query) language

[Siva B]

hi all,
i *need* to write a language interpreter which should always start with a
command
like
USE x_database;
without executing the above i can't write SELECT  command

similar way i *need* to execute the command language.

if i run USE command i can remember(store ) the database name and i
can run other commands(SELECT,INSERT UPDATE) well but if don't run the
USE command and if i try to run other commands  that should give some
warning.
How can i do it.
any *help*...

I want to print simply like 'database is not selected'

plz *help* me...
Thanks,
Kiso
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