Connecting from Spark/pyspark to PostgreSQL

I have tried SPARK_CLASSPATH environment variable but it doesn't work with Spark 1.6.

Other answers from posts like below suggested adding pyspark command arguments and it works.

Not able to connect to postgres using jdbc in pyspark shell

Apache Spark : JDBC connection not working

pyspark --conf spark.executor.extraClassPath=<jdbc.jar> --driver-class-path <jdbc.jar> --jars <jdbc.jar> --master <master-URL>