DB_HOST=...
DB_PORT=...
DB_USER=...
DB_PASSWORD=...
DB_NAME=...
mysql="mysql -h$DB_HOST -P$DB_PORT -u$DB_USER -D$DB_NAME -s -e"
export MYSQL_PWD=$DB_PASSWORD
query_sql="select a,b,c from qwe where pq='xy"
read -a query_res <<< $($mysql "$query_sql")
a=${query_res[0]}
b=${query_res[1]}
c=${query_res[2]}