How do I capture a SQLPlus exit code within a shell script?

I have a KornShell (ksh) script that logins into SQL*Plus and executing a script. Within the shell script I would like to capture the status code of the SQL statement that was executed. Currently there is an error with SQL and I am unable to capture it by checking $?. How would I capture the success or error code from the sql statement and pass it to the shell script.

Snippet of ksh script:

sqlplus $JDBC_FBUID_U/$JDBC_FBPWD_U@$JDBC_FBDB @${FBC_HOME}/FBCS003.sql ${outputfile}
if [ $? != 0 ]
then
  msg_txt="The execution of Sql script /tmp/FBCS003.sql failed.  Please investigate."
  echo ${msg_txt}
  echo ${msg_txt} | mailx -r ${fromemail} -s "FBCB003: The execution of Sql script /tmp/FBCS003.sql failed." ${toemail}
  epage -n ${pagerdef} ${pagernum} "FBCB003: ${msg_txt}"
  exit 1
fi

SQL script FBCS003.sql

-- Set SQLPlus variables.
SET NEWPAGE 0
SET WRAP OFF
SET LINESIZE 9999
SET ECHO OFF
SET FEEDBACK OFF
SET VERIFY OFF
SET HEADING OFF
SET PAGESIZE 0
SET COLSEP |
SET TRIMSPOOL ON
SET TIMING ON

-- Open output file
-- The file path and name are passed from the calling script FBCS003.
spool &1

-- Main Select Statement
select
ct.fiscal_yr_no,
ct.acct_per_no,
ct.bus_unit_id,
ct.btch_file_seq_no,
ct.comm_tran_srce_cd,
ct.rec_no,
ct.rev_gl_acct_no,
ct.gl_prod_cd,
ct.prod_desc,
ct.paid_ir_no,
ct.srce_ir_no,
ct.ir_no_house_acct_rsn_txt,
ct.vndr_acct_ty_id,
ct.clnt_na,
ct.issr_na,
ct.clnt_na,
ct.issr_na,
ct.trd_da,
ct.setl_da,
ct.ord_ty_cd,
ct.actv_ty_cd,
ct.prin_amt,
ct.grs_comm_amt,
ct.net_comm_amt,
ct.vndr_prod_ty_cd,
ct.vndr_stmt_id
from fin.comm_tran ct
where ct.bus_unit_id = 'EJL'
and ct.vndr_acct_ty_id in
('11111111','222222222')
-- Execute sql statement.
/

-- Close output file
spool off

-- Exit SQL
exit
/

Have you tried using