jack@jackserver:~$ cat sample.py 
import os
#import org.apache.spark.storage.StorageLevel._

os.environ["SPARK_HOME"] = "/home/jack/spark-1.6.1"

from pyspark import SparkContext, SparkConf
from pyspark.sql import SQLContext

spark_config = SparkConf().setMaster("local[8]")  
sc = SparkContext(conf=spark_config) 
sqlContext = SQLContext(sc)

df = (sqlContext.load(source="jdbc",url="jdbc:oracle:thin:system/***@10.10.10.5:1521:oracledb",dbtable="(select * from maindata.t_invoices)"))
#df.persist()

df.saveAsTextFile("/tmp/spark_out.csv")

sc.stop()


./spark-1.6.1/bin/pyspark sample.py 

Traceback (most recent call last):
  File "/home//sample.py", line 18, in <module>
    df.saveAsTextFile("/tmp/spark_out.csv")
  File "/home//spark-1.6.1/python/lib/pyspark.zip/pyspark/sql/dataframe.py", line 842, in __getattr__
AttributeError: 'DataFrame' object has no attribute 'saveAsTextFile'

print(df.count())

df.show()