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This package includes the Snowflake Connector for Python, which conforms to the Python DB API 2.0 specification: https://www.python.org/dev/peps/pep-0249/

Snowflake Documentation is available at: https://docs.snowflake.net/

Source code is also available at: https://github.com/snowflakedb/snowflake-connector-python

Release Notes

  • v1.4.3 (August 17, 2017)

    • Changed the log levels for some messages from ERROR to DEBUG to address confusion as real incidents. In fact, they are not real issues but signals for connection retry.
    • Added certifi to the dependent component list to mitigate CA root certificate out of date issue.
    • Set the maximum versions of dependent components boto3 and botocore.
    • Updated cryptography and pyOpenSSL version dependeny change.
    • Added a connection parameter validate_default_parameters to validate the default database, schema and warehouse. If the specified object doesn't exist, it raises an error.

  • v1.4.2 (August 3, 2017)

    • Fixed retry HTTP 400 in upload file when AWS token expires
    • Relaxed the version of dependent components pyasn1 and pyasn1-modules

  • v1.4.1 (July 26, 2017)

    • Pinned pyasn1 and pyasn1-modules versions to 0.2.3 and 0.0.9, respectively

  • v1.4.0 (July 6, 2017)

    • Relaxed the versions of dependent components boto3, botocore, cffi and cryptography and pyOpenSSL
    • Minor improvements in OCSP response file cache

  • v1.3.18 (June 15, 2017)

    • Fixed OCSP response cache file not found issue on Windows. Drive letter was taken off
    • Use less restrictive cryptography>=1.7,<1.8
    • Added ORC detection in PUT command

  • v1.3.17 (June 1, 2017)

    • Timeout OCSP request in 60 seconds and retry
    • Set autocommit and abort_detached_query session parameters in authentication time if specified
    • Fixed cross region stage issue. Could not get files in us-west-2 region S3 bucket from us-east-1

  • v1.3.16 (April 20, 2017)

    • Fixed issue in fetching DATE causing [Error 22] Invalid argument on Windows
    • Retry on RuntimeError in requests

  • v1.3.15 (March 30, 2017)

    • Refactored data converters in fetch to improve performance
    • Fixed timestamp format FF to honor the scale of data type
    • Improved the security of OKTA authentication with hostname verifications
    • Retry PUT on the error OpenSSL.SSL.SysCallError 10053 with lower concurrency
    • Added raw_msg attribute to Error class
    • Refactored session managements

  • v1.3.14 (February 24, 2017)

    • Improved PUT and GET error handler.
    • Added proxy support to OCSP checks.
    • Use proxy parameters for PUT and GET commands.
    • Added sfqid and sqlstate to the results from query results.
    • Fixed the connection timeout calculation based on login_timeout and network_timeout.
    • Improved error messages in case of 403, 502 and 504 HTTP reponse code.
    • Upgraded cryptography to 1.7.2, boto3 to 1.4.4 and botocore to 1.5.14.
    • Removed explicit DNS lookup for OCSP URL.

  • v1.3.13 (February 9, 2017)

    • Fixed AWS SQS connection error with OCSP checks
    • Added login_timeout and network_timeout parameters to the Connection objects.
    • Fixed forbidden access error handing

  • v1.3.12 (February 2, 2017)

    • Fixed region parameter. One character was truncated from the tail of account name
    • Improved performance of fetching data by refactoring fetchone method

  • v1.3.11 (January 27, 2017)

    • Fixed the regression in 1.3.8 that caused intermittent 504 errors

  • v1.3.10 (January 26, 2017)

    • Compress data in HTTP requests at all times except empty data or OKTA request
    • Refactored FIXED, REAL and TIMESTAMP data fetch to improve performance. This mainly impacts SnowSQL
    • Added region option to support EU deployments better
    • Increased the retry counter for OCSP servers to mitigate intermittent failure
    • Refactored HTTP access retry logic

  • v1.3.9 (January 16, 2017)

    • Upgraded botocore to 1.4.93 to fix and boto3 to 1.4.3 to fix the HTTPS request failure in Python 3.6
    • Fixed python2 incomaptible import http.client
    • Retry OCSP validation in case of non-200 HTTP code returned

  • v1.3.8 (January 12, 2017)

    • Convert non-UTF-8 data in the large result set chunk to Unicode replacement characters to avoid decode error.
    • Updated copyright year to 2017.
    • Use six package to support both PY2 and PY3 for some functions
    • Upgraded cryptography to 1.7.1 to address MacOS Python 3.6 build issue.
    • Fixed OverflowError caused by invalid range of timetamp data for SnowSQL.

  • v1.3.7 (December 8, 2016)

    • Increased the validity date acceptance window to prevent OCSP returning invalid responses due to out-of-scope validity dates for certificates.
    • Enabled OCSP response cache file by default.

  • v1.3.6 (December 1, 2016)

    • Upgraded cryptography to 1.5.3, pyOpenSSL to 16.2.0 and cffi to 1.9.1.

  • v1.3.5 (November 17, 2016)

    • Fixed CA list cache race condition
    • Added retry intermittent 400 HTTP Bad Request error

  • v1.3.4 (November 3, 2016)

    • Added quoted_name data type support for binding by SQLAlchemy
    • Not to compress parquiet file in PUT command

  • v1.3.3 (October 20, 2016)

    • Downgraded botocore to 1.4.37 due to potential regression.
    • Increased the stability of PUT and GET commands

  • v1.3.2 (October 12, 2016)

    • Upgraded botocore to 1.4.52.
    • Set the signature version to v4 to AWS client. This impacts PUT, GET commands and fetching large result set.

  • v1.3.1 (September 30, 2016)

    • Added an account name including subdomain.

  • v1.3.0 (September 26, 2016)

    • Added support for the BINARY data type, which enables support for more Python data types:

      • Python 3:

        • bytes and bytearray can be used for binding.
        • bytes is also used for fetching BINARY data type.

      • Python 2:

        • bytearray can be used for binding
        • str is used for fetching BINARY data type.

    • Added proxy_user and proxy_password connection parameters for proxy servers that require authentication.

  • v1.2.8 (August 16, 2016)

    • Upgraded botocore to 1.4.37.
    • Added Connection.execute_string and Connection.execute_stream to run multiple statements in a string and stream.
    • Increased the stability of fetching data for Python 2.
    • Refactored memory usage in fetching large result set (Work in Progress).

  • v1.2.7 (July 31, 2016)

    • Fixed snowflake.cursor.rowcount for INSERT ALL.
    • Force OCSP cache invalidation after 24 hours for better security.
    • Use use_accelerate_endpoint in PUT and GET if Transfer acceleration is enabled for the S3 bucket.
    • Fixed the side effect of python-future that loads test.py in the current directory.

  • v1.2.6 (July 13, 2016)

    • Fixed the AWS token renewal issue with PUT command when uploading uncompressed large files.

  • v1.2.5 (July 8, 2016)

    • Added retry for errors S3UploadFailedError and RetriesExceededError in PUT and GET, respectively.

  • v1.2.4 (July 6, 2016)

    • Added max_connection_pool parameter to Connection so that you can specify the maximum number of HTTP/HTTPS connections in the pool.
    • Minor enhancements for SnowSQL.

  • v1.2.3 (June 29, 2016)

    • Fixed 404 issue in GET command. An extra slash character changed the S3 path and failed to identify the file to download.

  • v1.2.2 (June 21, 2016)

    • Upgraded botocore to 1.4.26.
    • Added retry for 403 error when accessing S3.

  • v1.2.1 (June 13, 2016)

    • Improved fetch performance for data types (part 2): DATE, TIME, TIMESTAMP, TIMESTAMP_LTZ, TIMESTAMP_NTZ and TIMESTAMP_TZ.

  • v1.2.0 (June 10, 2016)

    • Improved fetch performance for data types (part 1): FIXED, REAL, STRING.

  • v1.1.5 (June 2, 2016)

    • Upgraded boto3 to 1.3.1 and botocore and 1.4.22.
    • Fixed snowflake.cursor.rowcount for DML by snowflake.cursor.executemany.
    • Added numpy data type binding support. numpy.intN, numpy.floatN and numpy.datetime64 can be bound and fetched.

  • v1.1.4 (May 21, 2016)

    • Upgraded cffi to 1.6.0.
    • Minor enhancements to SnowSQL.

  • v1.1.3 (May 5, 2016)

    • Upgraded cryptography to 1.3.2.

  • v1.1.2 (May 4, 2016)

    • Changed the dependency of tzlocal optional.
    • Fixed charmap error in OCSP checks.

  • v1.1.1 (Apr 11, 2016)

    • Fixed OCSP revocation check issue with the new certificate and AWS S3.
    • Upgraded cryptography to 1.3.1 and pyOpenSSL to 16.0.0.

  • v1.1.0 (Apr 4, 2016)

    • Added bzip2 support in PUT command. This feature requires a server upgrade.
    • Replaced the self contained packages in snowflake._vendor with the dependency of boto3 1.3.0 and botocore 1.4.2.

  • v1.0.7 (Mar 21, 2016)

    • Keep pyOpenSSL at 0.15.1.

  • v1.0.6 (Mar 15, 2016)

    • Upgraded cryptography to 1.2.3.
    • Added support for TIME data type, which is now a Snowflake supported data type. This feature requires a server upgrade.
    • Added snowflake.connector.DistCursor to fetch the results in dict instead of tuple.
    • Added compression to the SQL text and commands.

  • v1.0.5 (Mar 1, 2016)

    • Upgraded cryptography to 1.2.2 and cffi to 1.5.2.
    • Fixed the conversion from TIMESTAMP_LTZ to datetime in queries.

  • v1.0.4 (Feb 15, 2016)

    • Fixed the truncated parallel large result set.
    • Added retry OpenSSL low level errors ETIMEDOUT and ECONNRESET.
    • Time out all HTTPS requests so that the Python Connector can retry the job or recheck the status.
    • Fixed the location of encrypted data for PUT command. They used to be in the same directory as the source data files.
    • Added support for renewing the AWS token used in PUT commands if the token expires.

  • v1.0.3 (Jan 13, 2016)

    • Added support for the BOOLEAN data type (i.e. TRUE or FALSE). This changes the behavior of the binding for the bool type object:

      • Previously, bool was bound as a numeric value (i.e. 1 for True, 0 for False).
      • Now, bool is bound as native SQL data (i.e. TRUE or FALSE).

    • Added the autocommit method to the Connection object:

      • By default, autocommit mode is ON (i.e. each DML statement commits the change).
      • If autocommit mode is OFF, the commit and rollback methods are enabled.

    • Avoid segfault issue for cryptography 1.2 in Mac OSX by using 1.1 until resolved.

  • v1.0.2 (Dec 15, 2015)

    • Upgraded boto3 1.2.2, botocore 1.3.12.
    • Removed SSLv3 mapping from the initial table.

  • v1.0.1 (Dec 8, 2015)

    • Minor bug fixes.

  • v1.0.0 (Dec 1, 2015)

    • General Availability release.