shell 获取 postgresql返回字段值

databasename=rftDatabase
result=`psql << EOF 
  SELECT count(u.datname) FROM pg_catalog.pg_database u where u.datname='${databasename}'; 
EOF`


DBID=`echo $result | awk -F' ' '{print $3}'`
echo "${DBID}"
if [ "${DBID}" = "0" ]; then
   echo "count=0"
else 
   echo "count>0"
fi