example.py

#!/usr/bin/env python

import logging

log = logging.getLogger()
log.setLevel('DEBUG')
handler = logging.StreamHandler()
handler.setFormatter(logging.Formatter("%(asctime)s [%(levelname)s] %(name)s: %(message)s"))
log.addHandler(handler)

from cassandra import ConsistencyLevel
from cassandra.cluster import Cluster
from cassandra.query import SimpleStatement

KEYSPACE = "testkeyspace"

def main():
 cluster = Cluster(['127.0.0.1'])
 session = cluster.connect()

 rows = session.execute("SELECT keyspace_name FROM system.schema_keyspaces")
 if KEYSPACE in [row[0] for row in rows]:
 log.info("dropping existing keyspace...")
 session.execute("DROP KEYSPACE " + KEYSPACE)

 log.info("creating keyspace...")
 session.execute("""
 CREATE KEYSPACE %s
 WITH replication = { 'class': 'SimpleStrategy', 'replication_factor': '2' }
 """ % KEYSPACE)

 log.info("setting keyspace...")
 session.set_keyspace(KEYSPACE)

 log.info("creating table...")
 session.execute("""
 CREATE TABLE mytable (
 thekey text,
 col1 text,
 col2 text,
 PRIMARY KEY (thekey, col1)
 )
 """)

 query = SimpleStatement("""
 INSERT INTO mytable (thekey, col1, col2)
 VALUES (%(key)s, %(a)s, %(b)s)
 """, consistency_level=ConsistencyLevel.ONE)

 prepared = session.prepare("""
 INSERT INTO mytable (thekey, col1, col2)
 VALUES (?, ?, ?)
 """)

 for i in range(10):
 log.info("inserting row %d" % i)
 session.execute(query, dict(key="key%d" % i, a='a', b='b'))
 session.execute(prepared.bind(("key%d" % i, 'b', 'b')))

 future = session.execute_async("SELECT * FROM mytable")
 log.info("key\tcol1\tcol2")
 log.info("---\t----\t----")

 try:
 rows = future.result()
 except Exception:
 log.exeception()

 for row in rows:
 log.info('\t'.join(row))

 session.execute("DROP KEYSPACE " + KEYSPACE)

if __name__ == "__main__":
 main()