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#!/usr/bin/env python
# Copyright 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
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()
log.info("creating keyspace...")
session.execute("""
CREATE KEYSPACE IF NOT EXISTS %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 IF NOT EXISTS 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, ("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.exception("Error reading rows:")
return
for row in rows:
log.info('\t'.join(row))
session.execute("DROP KEYSPACE " + KEYSPACE)
if __name__ == "__main__":
main()
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