django1/django/contrib/postgres/indexes.py

96 lines
3.7 KiB
Python

from django.db.models import Index
from django.utils.functional import cached_property
__all__ = ['BrinIndex', 'GinIndex', 'GistIndex']
class PostgresIndex(Index):
@cached_property
def max_name_length(self):
# Allow an index name longer than 30 characters when the suffix is
# longer than the usual 3 character limit. The 30 character limit for
# cross-database compatibility isn't applicable to PostgreSQL-specific
# indexes.
return Index.max_name_length - len(Index.suffix) + len(self.suffix)
class BrinIndex(PostgresIndex):
suffix = 'brin'
def __init__(self, *, pages_per_range=None, **kwargs):
if pages_per_range is not None and pages_per_range <= 0:
raise ValueError('pages_per_range must be None or a positive integer')
self.pages_per_range = pages_per_range
super().__init__(**kwargs)
def deconstruct(self):
path, args, kwargs = super().deconstruct()
if self.pages_per_range is not None:
kwargs['pages_per_range'] = self.pages_per_range
return path, args, kwargs
def create_sql(self, model, schema_editor, using=''):
statement = super().create_sql(model, schema_editor, using=' USING brin')
if self.pages_per_range is not None:
statement.parts['extra'] = ' WITH (pages_per_range={})'.format(
schema_editor.quote_value(self.pages_per_range)
) + statement.parts['extra']
return statement
class GinIndex(PostgresIndex):
suffix = 'gin'
def __init__(self, *, fastupdate=None, gin_pending_list_limit=None, **kwargs):
self.fastupdate = fastupdate
self.gin_pending_list_limit = gin_pending_list_limit
super().__init__(**kwargs)
def deconstruct(self):
path, args, kwargs = super().deconstruct()
if self.fastupdate is not None:
kwargs['fastupdate'] = self.fastupdate
if self.gin_pending_list_limit is not None:
kwargs['gin_pending_list_limit'] = self.gin_pending_list_limit
return path, args, kwargs
def create_sql(self, model, schema_editor, using=''):
statement = super().create_sql(model, schema_editor, using=' USING gin')
with_params = []
if self.gin_pending_list_limit is not None:
with_params.append('gin_pending_list_limit = %d' % self.gin_pending_list_limit)
if self.fastupdate is not None:
with_params.append('fastupdate = {}'.format('on' if self.fastupdate else 'off'))
if with_params:
statement.parts['extra'] = 'WITH ({}) {}'.format(', '.join(with_params), statement.parts['extra'])
return statement
class GistIndex(PostgresIndex):
suffix = 'gist'
def __init__(self, *, buffering=None, fillfactor=None, **kwargs):
self.buffering = buffering
self.fillfactor = fillfactor
super().__init__(**kwargs)
def deconstruct(self):
path, args, kwargs = super().deconstruct()
if self.buffering is not None:
kwargs['buffering'] = self.buffering
if self.fillfactor is not None:
kwargs['fillfactor'] = self.fillfactor
return path, args, kwargs
def create_sql(self, model, schema_editor):
statement = super().create_sql(model, schema_editor, using=' USING gist')
with_params = []
if self.buffering is not None:
with_params.append('buffering = {}'.format('on' if self.buffering else 'off'))
if self.fillfactor is not None:
with_params.append('fillfactor = %s' % self.fillfactor)
if with_params:
statement.parts['extra'] = 'WITH ({}) {}'.format(', '.join(with_params), statement.parts['extra'])
return statement