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Fixed #7420 -- Abstracted some more database options into DatabaseFeatures -- supports_usecs, time_field_needs_date, interprets_empty_strings_as_nulls and date_field_supports_time_value -- and changed various hard-coded 'if DATABASE_BACKEND == oracle' statements to use the new options. Thanks to ramiro for the patch 

git-svn-id: http://code.djangoproject.com/svn/django/trunk@7643 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Adrian Holovaty 2008-06-16 03:15:04 +00:00
parent 57311b5998
commit 06315375ce
5 changed files with 30 additions and 16 deletions
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9
django/db/backends/__init__.py
View File

@ -52,6 +52,10 @@ class BaseDatabaseFeatures(object):
uses_custom_query_class = False
empty_fetchmany_value = []
update_can_self_select = True
supports_usecs = True
time_field_needs_date = False
interprets_empty_strings_as_nulls = False
date_field_supports_time_value = True
class BaseDatabaseOperations(object):
"""
@ -266,3 +270,8 @@ class BaseDatabaseOperations(object):
tablespaces.
"""
return None
def prep_for_like_query(self, x):
"""Prepares a value for use in a LIKE query."""
from django.utils.encoding import smart_unicode
return smart_unicode(x).replace("\\", "\\\\").replace("%", "\%").replace("_", "\_")

1
django/db/backends/mysql/base.py
View File

@ -64,6 +64,7 @@ class DatabaseFeatures(BaseDatabaseFeatures):
inline_fk_references = False
empty_fetchmany_value = ()
update_can_self_select = False
supports_usecs = False
class DatabaseOperations(BaseDatabaseOperations):
def date_extract_sql(self, lookup_type, field_name):

1
django/db/backends/mysql_old/base.py
View File

@ -68,6 +68,7 @@ class DatabaseFeatures(BaseDatabaseFeatures):
inline_fk_references = False
empty_fetchmany_value = ()
update_can_self_select = False
supports_usecs = False
class DatabaseOperations(BaseDatabaseOperations):
def date_extract_sql(self, lookup_type, field_name):

3
django/db/backends/oracle/base.py
View File

@ -31,6 +31,9 @@ class DatabaseFeatures(BaseDatabaseFeatures):
supports_tablespaces = True
uses_case_insensitive_names = True
uses_custom_query_class = True
time_field_needs_date = True
interprets_empty_strings_as_nulls = True
date_field_supports_time_value = False
class DatabaseOperations(BaseDatabaseOperations):
def autoinc_sql(self, table, column):

32
django/db/models/fields/__init__.py
View File

@ -7,7 +7,7 @@ try:
except ImportError:
from django.utils import _decimal as decimal # for Python 2.3
from django.db import get_creation_module
from django.db import connection, get_creation_module
from django.db.models import signals
from django.db.models.query_utils import QueryWrapper
from django.dispatch import dispatcher
@ -33,9 +33,6 @@ HORIZONTAL, VERTICAL = 1, 2
BLANK_CHOICE_DASH = [("", "---------")]
BLANK_CHOICE_NONE = [("", "None")]
# prepares a value for use in a LIKE query
prep_for_like_query = lambda x: smart_unicode(x).replace("\\", "\\\\").replace("%", "\%").replace("_", "\_")
# returns the <ul> class for a given radio_admin value
get_ul_class = lambda x: 'radiolist%s' % ((x == HORIZONTAL) and ' inline' or '')
@ -97,7 +94,7 @@ class Field(object):
self.blank, self.null = blank, null
# Oracle treats the empty string ('') as null, so coerce the null
# option whenever '' is a possible value.
if self.empty_strings_allowed and settings.DATABASE_ENGINE == 'oracle':
if self.empty_strings_allowed and connection.features.interprets_empty_strings_as_nulls:
self.null = True
self.core, self.rel, self.default = core, rel, default
self.editable = editable
@ -235,13 +232,13 @@ class Field(object):
elif lookup_type in ('range', 'in'):
return value
elif lookup_type in ('contains', 'icontains'):
return ["%%%s%%" % prep_for_like_query(value)]
return ["%%%s%%" % connection.ops.prep_for_like_query(value)]
elif lookup_type == 'iexact':
return [prep_for_like_query(value)]
return [connection.ops.prep_for_like_query(value)]
elif lookup_type in ('startswith', 'istartswith'):
return ["%s%%" % prep_for_like_query(value)]
return ["%s%%" % connection.ops.prep_for_like_query(value)]
elif lookup_type in ('endswith', 'iendswith'):
return ["%%%s" % prep_for_like_query(value)]
return ["%%%s" % connection.ops.prep_for_like_query(value)]
elif lookup_type == 'isnull':
return []
elif lookup_type == 'year':
@ -252,9 +249,12 @@ class Field(object):
if settings.DATABASE_ENGINE == 'sqlite3':
first = '%s-01-01'
second = '%s-12-31 23:59:59.999999'
elif settings.DATABASE_ENGINE == 'oracle' and self.get_internal_type() == 'DateField':
elif not connection.features.date_field_supports_time_value and self.get_internal_type() == 'DateField':
first = '%s-01-01'
second = '%s-12-31'
elif not connection.features.supports_usecs:
first = '%s-01-01 00:00:00'
second = '%s-12-31 23:59:59.99'
else:
first = '%s-01-01 00:00:00'
second = '%s-12-31 23:59:59.999999'
@ -271,7 +271,7 @@ class Field(object):
if callable(self.default):
return self.default()
return force_unicode(self.default, strings_only=True)
if not self.empty_strings_allowed or (self.null and settings.DATABASE_ENGINE != 'oracle'):
if not self.empty_strings_allowed or (self.null and not connection.features.interprets_empty_strings_as_nulls):
return None
return ""
@ -629,7 +629,7 @@ class DateTimeField(DateField):
if value is not None:
# MySQL will throw a warning if microseconds are given, because it
# doesn't support microseconds.
if settings.DATABASE_ENGINE == 'mysql' and hasattr(value, 'microsecond'):
if not connection.features.supports_usecs and hasattr(value, 'microsecond'):
value = value.replace(microsecond=0)
value = smart_unicode(value)
return Field.get_db_prep_save(self, value)
@ -863,7 +863,7 @@ class FilePathField(Field):
self.path, self.match, self.recursive = path, match, recursive
kwargs['max_length'] = kwargs.get('max_length', 100)
Field.__init__(self, verbose_name, name, **kwargs)
def formfield(self, **kwargs):
defaults = {
'path': self.path,
@ -1071,7 +1071,7 @@ class TimeField(Field):
return "TimeField"
def get_db_prep_lookup(self, lookup_type, value):
if settings.DATABASE_ENGINE == 'oracle':
if connection.features.time_field_needs_date:
# Oracle requires a date in order to parse.
def prep(value):
if isinstance(value, datetime.time):
@ -1098,9 +1098,9 @@ class TimeField(Field):
if value is not None:
# MySQL will throw a warning if microseconds are given, because it
# doesn't support microseconds.
if settings.DATABASE_ENGINE == 'mysql' and hasattr(value, 'microsecond'):
if not connection.features.supports_usecs and hasattr(value, 'microsecond'):
value = value.replace(microsecond=0)
if settings.DATABASE_ENGINE == 'oracle':
if connection.features.time_field_needs_date:
# cx_Oracle expects a datetime.datetime to persist into TIMESTAMP field.
if isinstance(value, datetime.time):
value = datetime.datetime(1900, 1, 1, value.hour, value.minute,