Using connection_created signal defined in django.db.backends.signals
causes maximum recursion depth reached runtime error.
We fix this by not sending the extra signal after the connection to
the database is setup.

Unit tests are updated.
(cherry picked from commit c86a295)

Using prepared statements while inserting sufficiently large
data in a table with TEXT type column, data was getting corrupted.
This was due to wrong encoding of data length while sending
prepared statement packet.

We fix the issue by implementing a new function utils.lc_int().

A unit test has been added for BUG#19522948.
(cherry picked from commit 12f82ab)

The type_code in cursor.description was not comparing equal
to any of the type objects defined in mysql.connector.dbapi.
We fix the issue by removing __cmp__ and implementing the
rich comparison operators for the PEP-249 class
DBAPITypeObject.

A unit test has been added for BUG#19584051.
(cherry picked from commit f985cfc)

MySQL server 5.7.5 creates no user while bootstrapping a server. We add
extra DML to create the root@ocalhost user, making sure unit test can
run.
(cherry picked from commit 062cbde)

Connector/Python Django backend was raising error while converting an
invalid datetime value instead of returning None. We fix this issue
by adding a check for invalid values.

Unit tests are updated.
(cherry picked from commit a57f885)

We fix Pylint W0633 warning in mysql.connector.network module
with message "Attempting to unpack a non-sequence define at line 438".
(cherry picked from commit d40192e)

We improve the errors reported when invalid sharding keys
are given for RANGE_STRING and RANGE_DATETIME types.

We additionally improve performance by moving the sorting
of partition keys when saving cache entries. Previously, sorting
was done each time a partition was looked up.

Unit test for BUG#19642249 was added in test_fabric module.
(cherry picked from commit a95e9c6)

Change user command raises packets out of order error when used with
compression. This causes error when a pooled connection tries to
reset session which internally sends change user command for MySQL
server 5.7.2 or earlier. We fix this by raising a NotSupportedError
whenever someone tries to reset a session on MySQL server earlier
than 5.7.3.

A test case has been added for BUG#19549363.
(cherry picked from commit 1b412b7)

We move the unit tests checking error code generation date from main
repository to the internal repository. These tests need to be run only
while preparing release.
(cherry picked from commit d86e4ba)

When connection character set is set to 'binary', the string data
failed to decode since it is not a valid Python character set.
We fix this by returning string data without decoding when the
character set is set to 'binary'.

A unit test has been added for BUG#19500097.
(cherry picked from commit dcd5b63)

An extra patch in which we fix the Pylint errors for the the
insort_right_rev() function.
(cherry picked from commit 5454250)

We fix reporting errors containing non ascii characters with
Python v2. We fix this by encoding error message with 'utf8'
when used with Python v2.

A unit test has been added for BUG#19803702.
(cherry picked from commit c2a7630)

We fix lost connection to server error caused when server
is present at a remote location.

Using connection pooling with MySQL Fabric was raising AttributeError.
We fix this by creating a pool of connections to a server as and when
first time it is required to be connected.

To use pooling with Fabric, 'pool_size' argument should be used. Using
'pool_name' with Fabric raises AttributeError. This is because
we can't have two pools with same names on different servers.

A unit test has been added for BUG#19331658.

The Connector/Python Django backend was creating too many database
connections since as soon as an object of DatabaseWrapper was
instanciated, a connection to the MySQL server was set up. This is
required to enable some version specific MySQL features.

We fix this by adding the cached_property decorator to the
mysql_version()-method.

Unit tests are updated and also fixes BUG#19954882.

We fix a SyntaxError introduced while pushing.

MySQLCursor.fetchwarnings() was not returning any warnings even
when warnings were generated by calling a stored procedure using
MySQLCursor.callproc() method. We add support to fetch warnings
generated by a stored procedure.

A unit test has been added for BUG#19777815.

Passwords consisting of only integers were raising error when used
with option files. We fix this by not evaluating value for password
option in option files.

Unit tests are updated.
(cherry picked from commit 677b310)

We this fix we support Django SafeText and SafeBytes type fields.

A test case has been added for BUG#20106629.
(cherry picked from commit 18b69e4)

Inserting a string of length 251 to 255 using prepared statements
was raising a ProgrammingError exception:

    1210 (HY000): Incorrect arguments to mysqld_stmt_execute

We fix this by correctly encoding the length of the string while
sending it to the server.

A test case has been added for BUG#20407036.
(cherry picked from commit 955cfb7)

We fix conversion of SET data coming from MySQL server
when the set is empty. We now return an empty set(set([])) which
was previously returned as a set of empty string(set([''])).

A test case is added for BUG#20301989.
(cherry picked from commit f9b22fa)

We fix receiving a large amount of data in a field from server
The connector did not process packets correctly when distributed
across several packets.

Also receiving text greater then 16777215 bytes raised an
index out of range error.

A test case has been added for BUG#20462427.
(cherry picked from commit 7221b81)

We fix HASH based sharding which was causing the following
runtime error:

    ValueError: Unsupported sharding type HASH

A unit test has been added for BUG#20324089.
(cherry picked from commit 0f7a8e7)

Signed-off-by: Nuno Mariz <nuno.mariz@oracle.com>

This patch fixes a potential SQL injection that may occur when
the parameters expansion is done in multiple steps and under
some circumstances a substring in an incoming parameter value
can be expanded several times.