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Code Issues 32 Releases Wiki Activity

magic-removal: Fixed #1423 -- Improved implementation of get_date_trunc_sql() for MySQL backend. Thanks, Geert Vanderkelen

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git-svn-id: http://code.djangoproject.com/svn/django/branches/magic-removal@2735 bcc190cf-cafb-0310-a4f2-bffc1f526a37
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Adrian Holovaty 2006-04-23 22:10:50 +00:00
parent dee1af5d8b
commit 08c28d9897
2 changed files with 12 additions and 12 deletions
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AUTHORS
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@ -106,6 +106,7 @@ answer newbie questions, and generally made Django that much better:
Joe Topjian <http://joe.terrarum.net/geek/code/python/django/>
Malcolm Tredinnick
Amit Upadhyay
Geert Vanderkelen
Milton Waddams
Rachel Willmer <http://www.willmer.com/kb/>
wojtek

23
django/db/backends/mysql/base.py
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@ -124,18 +124,17 @@ def get_date_extract_sql(lookup_type, table_name):
def get_date_trunc_sql(lookup_type, field_name):
# lookup_type is 'year', 'month', 'day'
# http://dev.mysql.com/doc/mysql/en/date-and-time-functions.html
# MySQL doesn't support DATE_TRUNC, so we fake it by subtracting intervals.
# If you know of a better way to do this, please file a Django ticket.
# Note that we can't use DATE_FORMAT directly because that causes the output
# to be a string rather than a datetime object, and we need MySQL to return
# a date so that it's typecasted properly into a Python datetime object.
subtractions = ["interval (DATE_FORMAT(%s, '%%%%s')) second - interval (DATE_FORMAT(%s, '%%%%i')) minute - interval (DATE_FORMAT(%s, '%%%%H')) hour" % (field_name, field_name, field_name)]
if lookup_type in ('year', 'month'):
subtractions.append(" - interval (DATE_FORMAT(%s, '%%%%e')-1) day" % field_name)
if lookup_type == 'year':
subtractions.append(" - interval (DATE_FORMAT(%s, '%%%%m')-1) month" % field_name)
return "(%s - %s)" % (field_name, ''.join(subtractions))
fields = ['year', 'month', 'day', 'hour', 'minute', 'second']
format = ('%%Y-', '%%m', '-%%d', ' %%H:', '%%i', ':%%s') # Use double percents to escape.
format_def = ('0000-', '01', '-01', ' 00:', '00', ':00')
try:
i = fields.index(lookup_type) + 1
except ValueError:
sql = field_name
else:
format_str = ''.join([f for f in format[:i]] + [f for f in format_def[i:]])
sql = "CAST(DATE_FORMAT(%s, '%s') AS DATETIME)" % (field_name, format_str)
return sql
def get_limit_offset_sql(limit, offset=None):
sql = "LIMIT "