Changes in MySQL Connector/Python 2.0.0 (2014-07-24, Alpha)

• Functionality Added or Changed

• Bugs Fixed

Functionality Added or Changed

• Incompatible Change: Previous series of Connector/Python had separate Python 2 and Python 3 code bases. For Connector/Python 2.0, the source tree has been reorganized to have a single code base, for easier maintenance, testing, and distribution.

  This reorganization results in an incompatible change in behavior: With the use of “raw” cursors, the returned values is of the bytearray type. This is necessary for having both Python 2 and 3 return the same data. Consider the following example:

  import mysql.connector
  
  cnx = mysql.connector.connect(raw=True)
  cursor = cnx.cursor()
  cursor.execute('SELECT 1')
  print(cursor.fetchall())

  In Connector/Python 1.x, the output is:

  • Using Python 2: [('1',)]

  • Using Python 3: [(b'1',)]

  In Connector/Python 2.0, for both Python versions, the output is: [(bytearray(b'1'),)]

  To get the same value as in Connector/Python 1.x, do this:

  • Using Python 2: str(bytearray(b'1'))

  • Using Python 3: bytes((bytearray(b'1'))

  (WL #7462)

• Important Change: Previously, to enable use of LOAD DATA LOCAL, clients had to explicitly set the ClientFlag.LOCAL_FILES flag. This flag is now enabled by default. To disable it, the allow_local_infile option for connect()can be set to False. (WL #7937)

• For a stored procedure that produces multiple result sets, it is now possible to execute the procedure and process its results by executing a CALL statement. Execute the statement using execute() with a multi=True argument, and use the returned iterator to process each result in turn. (Bug #73291, Bug #19207922)

• Connector/Python now supports option files using two new options for connect():

  • option_files: Which option files to read. The value can be a file path name (a string) or a sequence of path name strings. By default, Connector/Python reads no option files, so this argument must be given explicitly to cause option files to be read. Files are read in the order specified.

  • option_groups: Which groups to read from option files, if option files are read. The value can be an option group name (a string) or a sequence of group name strings. If this argument is not given, the default value is ['client, 'connector_python'] to read the [client] and [connector_python] groups.

  For more information, see Connector/Python Option-File Support. (WL #7228)

• The mysql.connector.cursor module supports four new cursor classes:

  • The MySQLCursorDict cursor class returns each row as a dictionary. The keys for each dictionary object are the column names of the MySQL result.

    cursor = cnx.cursor(dictionary=True)

  • The MySQLCursorBufferedDict cursor class is like MySQLCursorDict, but fetches the entire result set after executing the query and buffers the rows.

    cursor = cnx.cursor(dictionary=True, buffered=True)

  • The MySQLCursorNamedTuple cursor class returns each row as a named tuple. Each column is accessible through an attribute of the tuple-like object.

    cursor = cnx.cursor(named_tuple=True)

  • The MySQLCursorBufferedNamedTuple cursor class is like MySQLCursorNamedTuple, but fetches the entire result set after executing the query and buffers the rows.

    cursor = cnx.cursor(named_tuple=True, buffered=True)

  For more information, see Subclasses cursor.MySQLCursor. (WL #7292)

• The packaging modules and supporting files have been removed from the main repository and from the source packages for Connector/Python. They are still available in the Connector/Python 1.x series. (WL #7716)

Bugs Fixed

• Django TimeField values of 00:00:00 were incorrectly converted to NULL because Python considered that value equal to False. (Bug #72732, Bug #18956789)

• Fetching results from a prepared statement that returned many columns could produce an error. (Bug #72602, Bug #18742429)

• Previously, a RuntimeError exception was raised when a Django application was inactive for a while. Now, the Django back end verifies that the database connection is still valid each time a database request is made. (Bug #72545, Bug #18843153)