SQL script based on hostname and database name?

Question

I am trying to write a script that I can run on several unix servers and databases that will do different sql statements based on which server and database it is being run in.
Something like:
if hostname = 'A' and database name = 'D' then do this
else if hostname = 'B' and database name = 'F' then do that
I have tried many diifferent combinations of shell scripts and sql scripts but can't seem to get anything that works.
Can someone help me out? Thanks.

Answer 1

Since you are already able to get he db and host info, you are well on your way to branching based on that information. All you need is the basic framework:
declare
  db VARCHAR2(30);
  host VARCHAR2(30);
  sqlcmd VARCHAR2(4000);
begin
  select sys_context('userenv','host') host
       , sys_context('userenv','db_name') db_name
    into host
       , db
    from dual;
  case
    when db = 'XE' and host = 'mypc' then
      sqlcmd := q'[local_package.do_something('parm1', :db, :host)]';
      execute IMMEDIATE sqlcmd USING db, host;
    when db = 'DEV' and host in ('serv1','serv2') then
      sqlcmd := q'[different_packge.do_something('parm1', :db, :host)]';
      execute IMMEDIATE sqlcmd USING db, host;
    else
      dbms_output.put_line('unrecognized db/host combination: '||db||', '||host);
  end case;
end;
/In this example I've used dynamic SQL since not all instances are guaranteed to have any or all of the package procedures referenced in the dynamic sql. With out the dynamic sql, you would get errors and be unable to run the script on any instance lacking one or more of the reference package procedures..