Question

Since I am new to unix scripting. I am running a SQL statement in ASE ISQL, and if SQL statement gives some result then I need to mail that result to a particular users. And if SQL is not returning any result then mail should not be sent.
The Sample Script I have wriiten is:

#!/bin/ksh
isql -U$DBO -S$DSQUERY -D$DBNAME -P$PASSWORD << END 
go
select * from 'Table'
go
if (@@rowcount !=0)

mailx -s "Hello" [e-mail] 


END

Please let me know where I am going wrong?

Answer 1

I think you need to capture the output of the SQL into a shell variable, and then test the result before sending the email, roughly like:

#!/bin/ksh
num=$(isql -U$DBO -S$DSQUERY -D$DBNAME -P$PASSWORD << END 
select count(*) from 'Table'
go
END
)

if [ "$num" -gt 0 ]
then mailx -s "Hello" [e-mail] < /dev/null
fi

I am assuming that the isql program will only print the number and not any headings or other information. If it is more verbose, then you have to do a more sensitive test.

Note, too, that COUNT(*) is quicker and more accurately what you’re after than your ‘select everything and count how many rows there were’ version.

---

Actually my problem is if my SQL statement is returning any result then only that resultset should be sent in a mail.

Then I’d use:

#!/bin/ksh
tmp=${TMPDIR:-/tmp}/results.$$
trap "rm -f $tmp; exit 1" 0 1 2 3 13 15

isql -U$DBO -S$DSQUERY -D$DBNAME -P$PASSWORD << END > $tmp
select * from 'Table'
go
END

if [ -s $tmp ]
then mailx -s "Hello" [e-mail] < $tmp || exit 1
fi
rm -f $tmp
trap 0
exit 0

This captures the results in a file. If the file is not empty (-s) then it sends the file as the body of an email. Please change the subject to something more meaningful. Also, are you sure it is a good idea to send corporate email to a Gmail account?