How to retrieve multiple data from table using shell script? - oracle

Question

var=`sqlplus -s user/pass <<EOF
2 set feedback off
3 set heading off
4 set pagesize 2000
5 select * from orders;
6 exit
7 EOF`
8 cnt=${#var[#]}
9 for (( i=0 ; i<cnt ; i++ ))
10 do
11 echo $var[0]
12 echo $var[1]
13 done
This is the code I am using but it is always giving me the last row.
Here is the result:
$ sh test.sh
[0] 5 555 c52
[1] 5 555 c52
Here is the table:
ORDER_ID QUANTITY EAN C_ID
--------------- ---------- ---------- --------------------
o1 14 551 c1
o2 14 552 c2
o3 3 553 c3
o4 4 554 c4
o5 5 555 c5

Answer 1

The variable var isn't an array. It's simple scalar variable contains multiline text. Therefore you can't use it for loop to retrive the variable contents. Try something like this:
~$ var=$(sqlplus -s user/pass#db_tnsalias <<EOF
set feedback off
set heading off
set pagesize 0
select * from orders;
exit
EOF
)
~$ echo "$var" | while read line; do echo $line; done
o1 14 551 c1
o2 4 552 c2
o3 3 553 c3
o4 4 554 c4
o5 5 555 c5
Take note:
double quotes around $var to avoid a variable expansion
pegesize 0 to remove first empty line

Answer 2

This cannot work because the sql command returns lines which are then fed into an array word by word. So afterwards there is no indication left where a data row ends and the next begins. Instead of filling an array, I'd pipe the whole output into a while loop which reads from stdin like so:
{ sqlplus -s system/subho94 <<EOF
set feedback off
set heading off
set pagesize 2000
select * from orders;
exit
EOF
} |
while read orderid quantity ean cid; do
echo $orderid $quantity $ean $cid
done
Note that while reading lines from stdin the shell will tokenize the lines but applying IFS, which results in all white space being stripped from the columns, but I think that is what you want anyways.