Spool Error capture question

Question

Hi,
I am trying to spool data from tables into flat files. I am using the following scripts to accomplish it
1. A cmd file (windows) that makes a call to a sql file
2. The SQL file which generates another query file at the run time, depending upon the table name passed to it
3. The run time query file , that executes the final query and spools the data into a txt file | delimited
For eg:
Actual command passed C:\Spool_utility\spool_utility TABLE_NAME
Eg of the spool utility file :
@echo off
SET dbuser=XX@YY
SET dbpw=xxxx
echo %date% - %time% - Start > %1%log.txt
echo START
sqlplus -s %dbuser%/%dbpw% @spool_utility.sql %1>%1.txt
echo %date% - %time% - Done >> %1%log.txt
echo DONE
Eg of the spool_utility.sql
set echo off
SET newpage 0
SET feedback off
SET linesize 32767
set pagesize 0
SET wrap off
SET recsep off
SET con off
SET trim on
SET trims on
set verify off
SET doc off
SET termout off
SET arraysize 5000
SET HEADING off
set colsep "|"
spool &1.sql;
Prompt Select * from &1 where some condition
spool off
set termout ON
@ &1
EXIT
The above file generates a table_name.sql file with the actual table name at run time and gets executed and the output is written to the table_name.txt file.
This works perfectly fine. But the issue is when someone passes some wrong table name or if there is a actual run time error while executing the query , the error with details itself itself gets written to the end spool file.
For eg : if i do this just to generate an error and execute it from command line, the query generates an error and writes the error to the spool file , but at the command prompt where I executed the command I do not see any error and the process seems to have run perfectly well
set xxx on xxx off as above
spool &1.sql;
Prompt Select * from &1 where rownum><10---this will cause the issue
spool off
set termout ON
@ &1
EXIT
Eg of spool file generated :
from     table_name WHERE rownum><=10 *
ERROR at line 62:
ORA-00936: missing expression
My question is, is there any way i can capture this runtime error and return this error to my calling sql script spool_utility.sql and then propagate it to the calling command file and do some tasks for eg removing the spool file and writing the actual error to a log file . Basically any way to know at my OS calling level that the entire spooling operation was unsuccessful.
Thanks

Answer 1

Thanks for the reply.
Querying the data dictionary will work only when the issue is a invalid table name. My question is can i capture any run time error, not only incorrect table name.
If there is any run time error (for eg the one I showed where I used a >< sign which is a invalid operator) the error gets written to my spool file, but there is no way I am able to capture that in my calling sql script and subsequently in the calling command file so that I can do something with the error. For eg if a spool file may get written with error messages, some batch process or user may pick up the spool file and start processing which i dont want to happen. i would like to trap that error or at least be notified of the error at my outer calling sql file or outer command file level, so that I can write the error to a log file and delete the erroneous spool file etc.