Not able to establish Oracle SQL session from within a BASH script - sql

Question

#!/bin/bash
#Oracle DB Info for NEXT
HOST="1.2.3.4"
PORT="5678"
SERVICE="MYDB"
DB_USER=$(whoami)
DB_PASS=$(base64 -d ~/.passwd)
DB_SCHEMA="my_db"
#Section for all of our functions.
function SQLConnection(){
sqlplus "$DB_USER"/"$DB_PASS"#"$HOST":"$PORT"/"$SERVICE"
}
function Connected(){
SQLConnection <<EOF
select sys_context('USERENV','SERVER_HOST') from dual;
EOF
}
function GetJMS(){
SQLConnection <<EOF
set echo on timing on lines 200 pages 100
select pd.destination from ${DB_SCHEMA}.pd_notification pd where pd.org_id = '$ORGID';
EOF
}
TODAY=$(date +"%A %B %d, %Y")
read -r -p $'\n\nWhat is the ORG ID? ' ORGID
read -r -p $'\n\nWhat is the REMOTE QUEUE MANAGER NAME? ' RQM
read -r -p $'\n\nWhat is the IP address of the REMOTE QUEUE MANAGER? ' CONN
read -r -p $'\n\nWhat is the PORT of the REMOTE QUEUE MANAGER? ' PORT
echo -en "* $(whoami)\n* $TODAY\n* MQ Setup $ORGID\n\nDEFINE +\n\tCHANNEL('$RQM.LQML') +\n\tCHLTYPE(SDR) +\n\tCONNAME('$CONN($PORT)') +\n\tXMITQ('BUF.2.$ORGID.XMQ')\n\tCHAUTH(TLS_RSA_WITH_AES_256_CBC_SHA256)\n\nDEFINE +\n\tCHANNEL('LQML.$RQM') +\n\tCHLTYPE(RCVR) +\n\tTRPTYPE(TCP)\n\nDEFINE +\n\tQLOCAL('$RQM') +\n\tTRIGDATA('LQML.$RQM') +\n\tINITQ('SYSTEM.CHANNEL.INITQ') +\n\tTRIGGER USAGE(XMITQ)\n\n" > ~/mqsetup.mqsc
CONNECTED=$(Connected | awk 'NR==16')
echo -en "\n\nHello From: $CONNECTED\n\n"
for JMSDESTINATION in $(GetJMS | awk 'NR>=16&&NR<=24{print $1}')
do
read -r -p $'\n\nWhich REMOTE QUEUE NAME matches with this ${JMSDESTINATION}?' RNAME
QDESC=$(echo "$JMSDESTINATION" | tr '.' ' ' | tr '[[:upper:]]' '[[:lower:]]')
echo -en "\n\nDEFINE +\n\tQR($JMSDESTINATION) +\n\t\tREPLACE DESCR('$ORGID $QDESC Queue') +\n\t\tREPLACE MAXDEPTH(5000) +\n\t\tXMITQ('BUF.2.$ORGID.XMQ') +\n\t\tRNAME('$RNAME') +\n\t\tRQMNAME('$RQM')" >> ~/mqsetup.mqsc
done
Here is the script I've built, hoping to automate the setup of IBM MQ Queues and Channels. My problem is that outside this script, I can establish an SQL Session without an issue, directly from the shell, provided I input the variables seen in the script. I can call the functions and everything returns just as I'd hope it would. When I run the exact same things from within the script, I get timeout errors ... the "Hello From" is blank, which tells me there is no DB connection.
I'm totally stumped as to why it all works great from outside the script, but inside it times out.
I appreciate the eyes and the help!

Answer 1

You're overwritng a variable value. You have this at the top of the script:
PORT="5678"
but then later on you do:
read -r -p $'\n\nWhat is the PORT of the REMOTE QUEUE MANAGER? ' PORT
which overwrites your 5678 value with whatever is entered there. That port may not be listening on the DB server at all, or may be doing something else, or if you don't enter a value it'll default to port 1521 when you connect. But either way the connection is going to fail, either quickly or slowly depending on the port state (e.g. slower maybe if a firewall blocks it).
If you test the connection by adding a Connected call before the read calls (as I initially did) then it seems to be working fine; but the connections after the reads don't work because port value it tries to connect to is now wrong.
Use a different name for the two variables, e.g. RQ_PORT for the second one - both in its read command and the subsequent creation of the ~/mqsetup.mqsc file.
You may also find it useful to add the -l flag to your SQL*Plus call so that if the connection fails for some reason it won't re-prompt for credentials, which in some circumstances can make the script appear to hang until you hit enter a few times.
Not directly relevant to the problem, but when automating anything like this I usually also use the -s flag to suppress the banners (which can vary between environments); and if you're only interested in capturing query output I'd usually set headings and/or pagination off, and feedback off, and generally set SQL*Plus up to generate as little noise as possible - it makes parsing out the interesting bits easier.