Starting with v0.2.0 python_vertica interface is more consistent with dbapi. One big thing missing is server side cursors/streaming. The old interface is deprecated, but should still be supported.
vertica-python is a native Python adapter for the Vertica (http://www.vertica.com) database.
This package is a Python port of the excellent Vertica Ruby gem (https://github.com/sprsquish/vertica).
vertica-python is currently in a alpha stage; it has been tested for functionality, but does not have a test suite. Please use with caution, and feel free to submit issues and/or pull requests.
vertica-python has been tested with Vertica 6.1.2/7.0.0 and Python 2.6/2.7. Please let me know if it's working on other versions.
If you're using pip >= 1.4 and you don't already have pytz installed:
pip install --pre pytz
To install vertica-python with pip:
pip install vertica-python
To install vertica-python with pip (with optional namedparams dependencies):
# see 'Using named parameters' section below
pip install 'vertica-python[namedparams]'
Source code for vertica-python can be found at:
http://github.com/uber/vertica-python
Buffered (in-memory) results as list:
from vertica_python import connect
connection = connect({
'host': '127.0.0.1',
'port': 5433,
'user': 'some_user',
'password': 'some_password',
'database': 'a_database'
})
cur = connection.cursor()
cur.execute("SELECT * FROM a_table LIMIT 2")
cur.fetchall()
# [ [1, 'something'], [2, 'something_else'] ]
connection.close()Buffered (in-memory) results as dictionary:
cur = connection.cursor('dict')
cur.execute("SELECT * FROM a_table LIMIT 2")
cur.fetchall()
# [ {'id': 1, 'value': 'something'}, {'id': 2, 'value': 'something_else'} ]
connection.close()Unbuffered (streaming) results:
def magical_row_handler(row):
print row
cur = connection.cursor(row_handler=magical_row_handler)
cur.execute("SELECT * FROM a_table LIMIT 2")
# {'id': 1, 'value': 'something'}
# {'id': 2, 'value': 'something_else'}
connection.close()Using named parameters :
# Using named parameter bindings requires psycopg2>=2.5.1 which is not includes with the base vertica_python requirements.
cur = connection.cursor()
cur.execute("SELECT * FROM a_table WHERE a = :propA b = :propB", {'propA': 1, 'propB': 'stringValue'})
cur.fetchall()
# [ [1, 'something'], [2, 'something_else'] ]
connection.close()Copy :
cur = connection.cursor()
cur.copy("COPY test_copy (id, name) from stdin DELIMITER ',' ", "1,foo\n2,bar")
# input stream copy is todoMIT License, please see LICENSE for details.
Many thanks go to the contributors to the Ruby Vertica gem, since they did all of the wrestling with Vertica's protocol and have kept the gem updated. They are: