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Code Issues 32 Releases Wiki Activity

Changed __year lookup to use a BETWEEN SQL statement instead of comparing the result of EXTRACT(year). This should be more efficient.

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git-svn-id: http://code.djangoproject.com/svn/django/trunk@4505 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Adrian Holovaty
2007-02-14 06:32:32 +00:00
parent 9efa60dafb
commit 4c4209b144
3 changed files with 29 additions and 17 deletions
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26
django/db/models/query.py
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@@ -198,17 +198,17 @@ class QuerySet(object):
counter = self._clone()
counter._order_by = ()
counter._select_related = False
offset = counter._offset
limit = counter._limit
counter._offset = None
counter._limit = None
try:
select, sql, params = counter._get_sql_clause()
except EmptyResultSet:
return 0
cursor = connection.cursor()
if self._distinct:
id_col = "%s.%s" % (backend.quote_name(self.model._meta.db_table),
@@ -553,7 +553,7 @@ class ValuesQuerySet(QuerySet):
else: # Default to all fields.
columns = [f.column for f in self.model._meta.fields]
field_names = [f.attname for f in self.model._meta.fields]
select = ['%s.%s' % (backend.quote_name(self.model._meta.db_table), backend.quote_name(c)) for c in columns]
cursor = connection.cursor()
cursor.execute("SELECT " + (self._distinct and "DISTINCT " or "") + ",".join(select) + sql, params)
@@ -576,12 +576,12 @@ class DateQuerySet(QuerySet):
if self._field.null:
self._where.append('%s.%s IS NOT NULL' % \
(backend.quote_name(self.model._meta.db_table), backend.quote_name(self._field.column)))
try:
select, sql, params = self._get_sql_clause()
except EmptyResultSet:
raise StopIteration
sql = 'SELECT %s %s GROUP BY 1 ORDER BY 1 %s' % \
(backend.get_date_trunc_sql(self._kind, '%s.%s' % (backend.quote_name(self.model._meta.db_table),
backend.quote_name(self._field.column))), sql, self._order)
@@ -598,15 +598,15 @@ class DateQuerySet(QuerySet):
c._kind = self._kind
c._order = self._order
return c
class EmptyQuerySet(QuerySet):
def __init__(self, model=None):
super(EmptyQuerySet, self).__init__(model)
self._result_cache = []
def count(self):
return 0
def delete(self):
pass
@@ -708,9 +708,9 @@ def get_where_clause(lookup_type, table_prefix, field_name, value):
return '%s%s IN (%s)' % (table_prefix, field_name, in_string)
else:
raise EmptyResultSet
elif lookup_type == 'range':
elif lookup_type in ('range', 'year'):
return '%s%s BETWEEN %%s AND %%s' % (table_prefix, field_name)
elif lookup_type in ('year', 'month', 'day'):
elif lookup_type in ('month', 'day'):
return "%s = %%s" % backend.get_date_extract_sql(lookup_type, table_prefix + field_name)
elif lookup_type == 'isnull':
return "%s%s IS %sNULL" % (table_prefix, field_name, (not value and 'NOT ' or ''))
@@ -791,7 +791,7 @@ def parse_lookup(kwarg_items, opts):
if len(path) < 1:
raise TypeError, "Cannot parse keyword query %r" % kwarg
if value is None:
# Interpret '__exact=None' as the sql '= NULL'; otherwise, reject
# all uses of None as a query value.
@@ -1007,7 +1007,7 @@ def delete_objects(seen_objs):
pk_list[offset:offset+GET_ITERATOR_CHUNK_SIZE])
for f in cls._meta.many_to_many:
if isinstance(f, GenericRelation):
from django.contrib.contenttypes.models import ContentType
from django.contrib.contenttypes.models import ContentType
query_extra = 'AND %s=%%s' % f.rel.to._meta.get_field(f.content_type_field_name).column
args_extra = [ContentType.objects.get_for_model(cls).id]
else: