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@thobbs
Created November 6, 2013 15:36
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Demonstration of timestamp and datetime behaviors for simple and prepared statements.
#!/usr/bin/env python
import logging
log = logging.getLogger()
log.setLevel('INFO')
handler = logging.StreamHandler()
handler.setFormatter(logging.Formatter("%(asctime)s [%(levelname)s] %(name)s: %(message)s"))
log.addHandler(handler)
from datetime import datetime
import time
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 timestamp,
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 (?, ?, ?)
""")
timestamp = int(time.time())
now = datetime.utcnow()
log.info("original time: %s", now)
# insert using timestamp
session.execute(query, dict(key="simple", a='a', b=timestamp))
session.execute(prepared.bind(("prepared", 'a', timestamp)))
# insert using datetime
session.execute(query, dict(key="d_simple", a='a', b=now))
session.execute(prepared.bind(("d_prepared", 'a', now)))
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([str(c) for c in row]))
session.execute("DROP KEYSPACE " + KEYSPACE)
if __name__ == "__main__":
main()
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