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  Oracle Tips by Burleson

Chapter 6 Oracle Encryption

      v_enc_proc_code      varchar2(2);
begin
      if INSERTING then
            v_key := get_key;
            :new.procedure_code := get_encrypted_value (
                     :new.procedure_code, v_key);
            insert into claim_line_keys
            values
            (:new.claim_id, :new.line_id, v_key);
      end if;
      if UPDATING then
            select key_value
            into v_key
            from claim_line_keys
            SEE CODE DEPOT FOR FULL SCRIPT
            and line_id = :new.line_id;
            :new.procedure_code := get_encrypted_value (
                     :new.procedure_code, v_key);
      end if;
end;
/

This will update the value with an encrypted value, if it already exists, or will insert the value with encryption, even if the user inserts the value in clear text.

SQL> select get_procedure_code (1,2) from dual;


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