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#!/usr/bin/env python

# Copyright 2013-2017 DataStax, Inc.

#

# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

#

# http://www.apache.org/licenses/LICENSE-2.0

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

import logging

import sys

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.cluster import Cluster

from cassandra.query import SimpleStatement

KEYSPACE = "key_space0"

def main():

if len(sys.argv) != 2:

print("usage: python example_core.py num_operations")

exit(1)

num_operations = int(sys.argv[1])

cluster = Cluster(['10.0.0.2'])

session = cluster.connect()

log.info("creating key space...")

session.execute("""

CREATE KEYSPACE IF NOT EXISTS %s

WITH replication = { 'class': 'SimpleStrategy', 'replication_factor': '1' }

""" % KEYSPACE)

log.info("setting keyspace...")

session.set_keyspace(KEYSPACE)

log.info("creating table...")

session.execute("CREATE TABLE IF NOT EXISTS test_table (thekey text PRIMARY KEY, col1 text, col2 text);")

# query = SimpleStatement("""

# INSERT INTO test_table (thekey, col1, col2)

# VALUES (%(key)s, %(a)s, %(b)s)

# """)

prepared = session.prepare("""

INSERT INTO test_table (thekey, col1, col2)

VALUES (?, ?, ?)

""")

for i in range(num_operations):

log.info("inserting row %d" % i)

# session.execute(query, dict(key="key%d" % i, a='a', b='b'))

session.execute(prepared, ("key%d" % i, 'e', 'e'))

future = session.execute_async("SELECT * FROM test_table")

log.info("key\tcol1\tcol2")

log.info("---\t----\t----")

try:

rows = future.result()

except Exception:

log.exception("Error reading rows:")

return

for row in rows:

log.info('\t'.join(row))

# session.execute("DROP KEYSPACE " + KEYSPACE)

if __name__ == "__main__":

main()