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#!/bin/bash
##
# use named pipes to get the last row of a given DBGEN data chunk
##
usage()
{
[ $# -gt 1 ] && echo "ERROR: $2"
echo "USAGE: `basename $1` <T> <SF=1> <DOP=1>"
echo " gather final row of table (e.g., -T <T>) at named <SF> and <DOP>"
exit
}
##
# MAIN
##
SF=1
DOP=1
# parse command line
case $# in
1)
[ $1 = "-h" ] && usage $0
[ $1 = "--help" ] && usage $0
t=$1
;;
2)
t=$1
SF=$2
;;
3)
t=$1
SF=$2
DOP=$3
;;
*)
usage $0 "invalid argument count"
;;
esac
# assure a setting for DSS_PATH
[ -z "$DSS_PATH" ] && DSS_PATH="."
[ ! -d "$DSS_PATH/$SF" ] && mkdir $DSS_PATH/$SF
chmod 777 $DSS_PATH
DSS_PATH=$DSS_PATH/$SF
export DSS_PATH
# set the other args
case $t in
n) f="nation"; DOP=1;; # special case for tiny table
r) f="region"; DOP=1;; # special case for tiny table
c) f="customer";;
s) f="supplier";;
P) f="part";;
S) f="partsupp";;
O) f="orders";;
L) f="lineitem";;
*) usage "bad table abreviation: $t"
esac
if [ $DOP -eq 1 ]
then PIPE="$DSS_PATH/${f}.tbl"
else PIPE="$DSS_PATH/${f}.tbl.${DOP}"
fi
# create a named pipe for each table
rm -rf $PIPE
mknod $PIPE p
# generate data into it
./dbgen -q -f -s $SF -T $t -S $DOP -C $DOP &
# assure that data is being written to the pipe
sleep 30
# read the last row from the pipe
tail -1 $PIPE > $f.last_row.$SF.$DOP &
wait
rm $PIPE
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