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Fixed Oracle in lookup when more than 1000 params 

Refs #21821.
This commit is contained in:
Anssi Kääriäinen 2014-01-19 11:30:26 +02:00
parent 457c16d0d6
commit a9f1711518
1 changed files with 34 additions and 2 deletions
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36
django/db/models/lookups.py
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@ -1,4 +1,5 @@
from copy import copy
from itertools import repeat
import inspect
from django.conf import settings
@ -77,8 +78,8 @@ class Lookup(RegisterLookupMixin):
lhs = lhs or self.lhs
return qn.compile(lhs)
def process_rhs(self, qn, connection, rhs=None):
value = rhs or self.rhs
def process_rhs(self, qn, connection):
value = self.rhs
# Due to historical reasons there are a couple of different
# ways to produce sql here. get_compiler is likely a Query
# instance, _as_sql QuerySet and as_sql just something with
@ -95,6 +96,12 @@ class Lookup(RegisterLookupMixin):
else:
return self.get_db_prep_lookup(value, connection)
def rhs_is_direct_value(self):
return not(
hasattr(self.rhs, 'as_sql') or
hasattr(self.rhs, '_as_sql') or
hasattr(self.rhs, 'get_compiler'))
def relabeled_clone(self, relabels):
new = copy(self)
new.lhs = new.lhs.relabeled_clone(relabels)
@ -186,6 +193,31 @@ class In(BuiltinLookup):
def get_rhs_op(self, connection, rhs):
return 'IN %s' % rhs
def as_sql(self, qn, connection):
max_in_list_size = connection.ops.max_in_list_size()
if self.rhs_is_direct_value() and (max_in_list_size and
len(self.rhs) > max_in_list_size):
rhs, rhs_params = self.process_rhs(qn, connection)
lhs, lhs_params = self.process_lhs(qn, connection)
in_clause_elements = ['(']
params = []
for offset in xrange(0, len(rhs_params), max_in_list_size):
if offset > 0:
in_clause_elements.append(' OR ')
in_clause_elements.append('%s IN (' % lhs)
params.extend(lhs_params)
group_size = min(len(rhs_params) - offset, max_in_list_size)
param_group = ', '.join(repeat('%s', group_size))
in_clause_elements.append(param_group)
in_clause_elements.append(')')
params.extend(rhs_params[offset: offset + max_in_list_size])
in_clause_elements.append(')')
return ''.join(in_clause_elements), params
else:
return super(In, self).as_sql(qn, connection)
default_lookups['in'] = In