GitLab

Add max_open_connections to pool

Fixes (#4)

Conflicts:
	README.rst
	example.py
	pymysql/tests/__init__.py
	pymysql/tests/test_issues.py
	runtests.py
	tornado_mysql/connections.py
	tornado_mysql/cursors.py
	tornado_mysql/tests/base.py
	tornado_mysql/tests/test_DictCursor.py
	tornado_mysql/tests/test_basic.py
	tox.ini

Merge branch 'defer_unbuffered_cleanup' of https://github.com/zzzeek/PyMySQL into zzzeek-defer_unbuffered_cleanup

Conflicts:
	pymysql/tests/base.py

delaying termination of an interrupted program; cleanup of uncollected
rows is left to the Connection on next execute, which emits a
warning at that time. (fixes #287)

Protocol parsing optimizations

fix issue 288: executemany now works with "insert ... on duplicate update" 

Removed code and variables that are not used anymore.
Fixed 24-bit integer parsing.
Moved one comment to its place.

This reduces amount of work done in row reading loop to minimum

To minimize function call number we should do one call to struct.unpack
with long format string instead of series of calls with one-field format
strings.
This change also provides helper method to make all such unpacks with no
extra data copying.

Common method to parse integer was very inefficient:
- read method has been called to create a copy of couple bytes;
- separate method has been called just to call struct.unpack;
- for one-byte integers always failing type check happend in byte2int
  method;
- for three-byte integers there were extra bytes concatenation.

This change makes all integer parsing with no copies and with minimal
method calls number.

Repair test_basic -> test_datatypes for MySQL 5.6 re: date rounding

fixed value without microseconds, so that no truncation
or rounding of microseconds takes place; whether they
are truncated or rounded depends on backend.
- improve the test for test_datetime to round trip the datetime
value, passing it in the INSERT as well as getting it back
from the SELECT.  Use version detection to only run the test
on compliant backends; don't catch and discard a ProgrammingError
without knowing what it is.

Return empty tuple when no rows in result

As defined in DB-API 2.0.

Fixes #284

Don't wrap MySQLError with MySQLError.