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for each value in an array, execute select statement

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# 1  
Old 08-17-2010
for each value in an array, execute select statement

Hello All,

I am new to shell scripting. I am working on Solaris O/S, bash script and sybase programming.

I want to loop through multiple values in an array and for each value, I
want to select a row from the database.

following is the code written for it.
output="loop.csv"          #Output file
elements=${#currency_pair[@]} # total number of rows in an array
for((i=0;i<$elements;i++)); do
        echo ${currency_pair[${i}]} #debug statement
        results=`isql -U$DBLOGIN -P$DBPASSWD -D$DBNAME -b -w 2000 -s',' -o$output <<EOF
        select Code,BidRate,AskRate,from FXPoint where   RelativeDateType = 1 and
        (Code = '${currency_pair[${i}]}')
        echo "Results is stored as"
        echo $results

but somehow my resultset is empty. I am not getting any error message or exception. it is just empty. Can anybody help me with the solution for this? Is there any other efficient method to do the same?
Moderator's Comments:
Mod Comment Use code tags please, ty.

Last edited by vbe; 08-17-2010 at 08:58 AM..
# 2  
Old 08-17-2010
Unindent your "EOF`" to the left margin - the spaces infront of it are confusing it.
# 3  
Old 08-17-2010
I unidented "EOF'". I removed all the spaces. Still I get the same result. Any other suggestion please?
# 4  
Old 08-17-2010
You could try creating a shell script called "xsql" with something like:
echo $* > /tmp/foo
cat - >> /tmp/foo

And replace "isql" for "xsql" and check the output in /tmp/foo to make sure the arguments and stdin look correct.
# 5  
Old 08-17-2010
Thanks citalor for your suggestion. I applied your suggestion like following.

echo $* > /tmp/foo
cat - >> /tmp/foo

currency_pair=("${currency_pair[@]}" "RVL EUR-CHF") #array element 1
currency_pair=("${currency_pair[@]}" "RVL EUR-JPY") #array element 2

for((i=0;i<$elements;i++)); do
echo ${currency_pair[${i}]}
results=`xsql -U$DBLOGIN -P$DBPASSWD -D$DBNAME -b -w 2000 -s',' -o$output <<EOF
select Code,BidRate,AskRate,from FXPoint where   RelativeDateType = 1 and
(Code = '${currency_pair[${i}]}')
echo "Results is stored as"
echo $results

But it did not work. When I execute this script. Nothing happens. The screen is blank and even the echo messages are not printed. I have to abort the script using CTRL+z.

Can something else work? Is there anything wrong with the logic?

Last edited by Scott; 08-17-2010 at 10:48 AM.. Reason: Code tags, please...
# 6  
Old 08-17-2010
Try changing xsql to:
echo logging args >&2
echo $* > /tmp/foo
echo logging stdin >&2
cat - >> /tmp/foo
echo finished >&2

I think you will find its getting to the "logging stdin" and then sits there, meaning the <<EOF thing isnt working...just a hunch ;-)
# 7  
Old 08-18-2010

I am getting the output on screen like following

logging args
logging stdin

but nothing after that. I have to abort the script as before.

We are not even reaching to the problem and its cause with this. Is there some other workaround to solve this.

Please suggest.

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