569 lines
20 KiB
Python
569 lines
20 KiB
Python
import itertools
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import math
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from copy import copy
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from django.core.exceptions import EmptyResultSet
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from django.db.models.expressions import Func, Value
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from django.db.models.fields import DateTimeField, Field, IntegerField
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from django.db.models.query_utils import RegisterLookupMixin
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from django.utils.functional import cached_property
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class Lookup:
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lookup_name = None
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prepare_rhs = True
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def __init__(self, lhs, rhs):
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self.lhs, self.rhs = lhs, rhs
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self.rhs = self.get_prep_lookup()
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if hasattr(self.lhs, 'get_bilateral_transforms'):
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bilateral_transforms = self.lhs.get_bilateral_transforms()
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else:
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bilateral_transforms = []
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if bilateral_transforms:
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# Warn the user as soon as possible if they are trying to apply
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# a bilateral transformation on a nested QuerySet: that won't work.
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from django.db.models.sql.query import Query # avoid circular import
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if isinstance(rhs, Query):
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raise NotImplementedError("Bilateral transformations on nested querysets are not supported.")
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self.bilateral_transforms = bilateral_transforms
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def apply_bilateral_transforms(self, value):
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for transform in self.bilateral_transforms:
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value = transform(value)
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return value
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def batch_process_rhs(self, compiler, connection, rhs=None):
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if rhs is None:
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rhs = self.rhs
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if self.bilateral_transforms:
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sqls, sqls_params = [], []
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for p in rhs:
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value = Value(p, output_field=self.lhs.output_field)
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value = self.apply_bilateral_transforms(value)
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value = value.resolve_expression(compiler.query)
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sql, sql_params = compiler.compile(value)
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sqls.append(sql)
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sqls_params.extend(sql_params)
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else:
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_, params = self.get_db_prep_lookup(rhs, connection)
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sqls, sqls_params = ['%s'] * len(params), params
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return sqls, sqls_params
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def get_source_expressions(self):
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if self.rhs_is_direct_value():
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return [self.lhs]
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return [self.lhs, self.rhs]
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def set_source_expressions(self, new_exprs):
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if len(new_exprs) == 1:
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self.lhs = new_exprs[0]
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else:
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self.lhs, self.rhs = new_exprs
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def get_prep_lookup(self):
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if hasattr(self.rhs, '_prepare'):
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return self.rhs._prepare(self.lhs.output_field)
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if self.prepare_rhs and hasattr(self.lhs.output_field, 'get_prep_value'):
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return self.lhs.output_field.get_prep_value(self.rhs)
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return self.rhs
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def get_db_prep_lookup(self, value, connection):
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return ('%s', [value])
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def process_lhs(self, compiler, connection, lhs=None):
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lhs = lhs or self.lhs
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if hasattr(lhs, 'resolve_expression'):
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lhs = lhs.resolve_expression(compiler.query)
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return compiler.compile(lhs)
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def process_rhs(self, compiler, connection):
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value = self.rhs
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if self.bilateral_transforms:
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if self.rhs_is_direct_value():
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# Do not call get_db_prep_lookup here as the value will be
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# transformed before being used for lookup
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value = Value(value, output_field=self.lhs.output_field)
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value = self.apply_bilateral_transforms(value)
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value = value.resolve_expression(compiler.query)
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if hasattr(value, 'as_sql'):
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sql, params = compiler.compile(value)
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return '(' + sql + ')', params
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else:
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return self.get_db_prep_lookup(value, connection)
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def rhs_is_direct_value(self):
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return not hasattr(self.rhs, 'as_sql')
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def relabeled_clone(self, relabels):
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new = copy(self)
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new.lhs = new.lhs.relabeled_clone(relabels)
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if hasattr(new.rhs, 'relabeled_clone'):
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new.rhs = new.rhs.relabeled_clone(relabels)
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return new
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def get_group_by_cols(self):
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cols = self.lhs.get_group_by_cols()
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if hasattr(self.rhs, 'get_group_by_cols'):
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cols.extend(self.rhs.get_group_by_cols())
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return cols
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def as_sql(self, compiler, connection):
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raise NotImplementedError
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@cached_property
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def contains_aggregate(self):
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return self.lhs.contains_aggregate or getattr(self.rhs, 'contains_aggregate', False)
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@cached_property
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def contains_over_clause(self):
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return self.lhs.contains_over_clause or getattr(self.rhs, 'contains_over_clause', False)
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@property
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def is_summary(self):
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return self.lhs.is_summary or getattr(self.rhs, 'is_summary', False)
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class Transform(RegisterLookupMixin, Func):
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"""
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RegisterLookupMixin() is first so that get_lookup() and get_transform()
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first examine self and then check output_field.
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"""
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bilateral = False
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arity = 1
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@property
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def lhs(self):
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return self.get_source_expressions()[0]
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def get_bilateral_transforms(self):
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if hasattr(self.lhs, 'get_bilateral_transforms'):
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bilateral_transforms = self.lhs.get_bilateral_transforms()
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else:
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bilateral_transforms = []
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if self.bilateral:
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bilateral_transforms.append(self.__class__)
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return bilateral_transforms
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class BuiltinLookup(Lookup):
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def process_lhs(self, compiler, connection, lhs=None):
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lhs_sql, params = super().process_lhs(compiler, connection, lhs)
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field_internal_type = self.lhs.output_field.get_internal_type()
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db_type = self.lhs.output_field.db_type(connection=connection)
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lhs_sql = connection.ops.field_cast_sql(
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db_type, field_internal_type) % lhs_sql
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lhs_sql = connection.ops.lookup_cast(self.lookup_name, field_internal_type) % lhs_sql
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return lhs_sql, list(params)
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def as_sql(self, compiler, connection):
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lhs_sql, params = self.process_lhs(compiler, connection)
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rhs_sql, rhs_params = self.process_rhs(compiler, connection)
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params.extend(rhs_params)
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rhs_sql = self.get_rhs_op(connection, rhs_sql)
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return '%s %s' % (lhs_sql, rhs_sql), params
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def get_rhs_op(self, connection, rhs):
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return connection.operators[self.lookup_name] % rhs
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class FieldGetDbPrepValueMixin:
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"""
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Some lookups require Field.get_db_prep_value() to be called on their
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inputs.
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"""
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get_db_prep_lookup_value_is_iterable = False
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def get_db_prep_lookup(self, value, connection):
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# For relational fields, use the output_field of the 'field' attribute.
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field = getattr(self.lhs.output_field, 'field', None)
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get_db_prep_value = getattr(field, 'get_db_prep_value', None)
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if not get_db_prep_value:
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get_db_prep_value = self.lhs.output_field.get_db_prep_value
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return (
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'%s',
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[get_db_prep_value(v, connection, prepared=True) for v in value]
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if self.get_db_prep_lookup_value_is_iterable else
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[get_db_prep_value(value, connection, prepared=True)]
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)
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class FieldGetDbPrepValueIterableMixin(FieldGetDbPrepValueMixin):
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"""
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Some lookups require Field.get_db_prep_value() to be called on each value
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in an iterable.
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"""
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get_db_prep_lookup_value_is_iterable = True
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def get_prep_lookup(self):
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prepared_values = []
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if hasattr(self.rhs, '_prepare'):
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# A subquery is like an iterable but its items shouldn't be
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# prepared independently.
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return self.rhs._prepare(self.lhs.output_field)
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for rhs_value in self.rhs:
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if hasattr(rhs_value, 'resolve_expression'):
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# An expression will be handled by the database but can coexist
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# alongside real values.
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pass
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elif self.prepare_rhs and hasattr(self.lhs.output_field, 'get_prep_value'):
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rhs_value = self.lhs.output_field.get_prep_value(rhs_value)
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prepared_values.append(rhs_value)
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return prepared_values
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def process_rhs(self, compiler, connection):
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if self.rhs_is_direct_value():
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# rhs should be an iterable of values. Use batch_process_rhs()
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# to prepare/transform those values.
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return self.batch_process_rhs(compiler, connection)
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else:
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return super().process_rhs(compiler, connection)
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def resolve_expression_parameter(self, compiler, connection, sql, param):
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params = [param]
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if hasattr(param, 'resolve_expression'):
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param = param.resolve_expression(compiler.query)
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if hasattr(param, 'as_sql'):
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sql, params = param.as_sql(compiler, connection)
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return sql, params
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def batch_process_rhs(self, compiler, connection, rhs=None):
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pre_processed = super().batch_process_rhs(compiler, connection, rhs)
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# The params list may contain expressions which compile to a
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# sql/param pair. Zip them to get sql and param pairs that refer to the
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# same argument and attempt to replace them with the result of
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# compiling the param step.
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sql, params = zip(*(
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self.resolve_expression_parameter(compiler, connection, sql, param)
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for sql, param in zip(*pre_processed)
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))
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params = itertools.chain.from_iterable(params)
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return sql, tuple(params)
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@Field.register_lookup
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class Exact(FieldGetDbPrepValueMixin, BuiltinLookup):
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lookup_name = 'exact'
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@Field.register_lookup
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class IExact(BuiltinLookup):
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lookup_name = 'iexact'
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prepare_rhs = False
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def process_rhs(self, qn, connection):
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rhs, params = super().process_rhs(qn, connection)
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if params:
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params[0] = connection.ops.prep_for_iexact_query(params[0])
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return rhs, params
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@Field.register_lookup
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class GreaterThan(FieldGetDbPrepValueMixin, BuiltinLookup):
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lookup_name = 'gt'
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@Field.register_lookup
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class GreaterThanOrEqual(FieldGetDbPrepValueMixin, BuiltinLookup):
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lookup_name = 'gte'
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@Field.register_lookup
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class LessThan(FieldGetDbPrepValueMixin, BuiltinLookup):
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lookup_name = 'lt'
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@Field.register_lookup
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class LessThanOrEqual(FieldGetDbPrepValueMixin, BuiltinLookup):
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lookup_name = 'lte'
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class IntegerFieldFloatRounding:
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"""
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Allow floats to work as query values for IntegerField. Without this, the
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decimal portion of the float would always be discarded.
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"""
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def get_prep_lookup(self):
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if isinstance(self.rhs, float):
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self.rhs = math.ceil(self.rhs)
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return super().get_prep_lookup()
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@IntegerField.register_lookup
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class IntegerGreaterThanOrEqual(IntegerFieldFloatRounding, GreaterThanOrEqual):
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pass
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@IntegerField.register_lookup
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class IntegerLessThan(IntegerFieldFloatRounding, LessThan):
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pass
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@Field.register_lookup
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class In(FieldGetDbPrepValueIterableMixin, BuiltinLookup):
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lookup_name = 'in'
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def process_rhs(self, compiler, connection):
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db_rhs = getattr(self.rhs, '_db', None)
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if db_rhs is not None and db_rhs != connection.alias:
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raise ValueError(
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"Subqueries aren't allowed across different databases. Force "
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"the inner query to be evaluated using `list(inner_query)`."
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)
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if self.rhs_is_direct_value():
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try:
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rhs = set(self.rhs)
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except TypeError: # Unhashable items in self.rhs
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rhs = self.rhs
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if not rhs:
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raise EmptyResultSet
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# rhs should be an iterable; use batch_process_rhs() to
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# prepare/transform those values.
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sqls, sqls_params = self.batch_process_rhs(compiler, connection, rhs)
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placeholder = '(' + ', '.join(sqls) + ')'
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return (placeholder, sqls_params)
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else:
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if not getattr(self.rhs, 'has_select_fields', True):
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self.rhs.clear_select_clause()
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self.rhs.add_fields(['pk'])
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return super().process_rhs(compiler, connection)
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def get_rhs_op(self, connection, rhs):
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return 'IN %s' % rhs
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def as_sql(self, compiler, connection):
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max_in_list_size = connection.ops.max_in_list_size()
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if self.rhs_is_direct_value() and max_in_list_size and len(self.rhs) > max_in_list_size:
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return self.split_parameter_list_as_sql(compiler, connection)
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return super().as_sql(compiler, connection)
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def split_parameter_list_as_sql(self, compiler, connection):
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# This is a special case for databases which limit the number of
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# elements which can appear in an 'IN' clause.
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max_in_list_size = connection.ops.max_in_list_size()
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lhs, lhs_params = self.process_lhs(compiler, connection)
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rhs, rhs_params = self.batch_process_rhs(compiler, connection)
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in_clause_elements = ['(']
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params = []
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for offset in range(0, len(rhs_params), max_in_list_size):
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if offset > 0:
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in_clause_elements.append(' OR ')
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in_clause_elements.append('%s IN (' % lhs)
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params.extend(lhs_params)
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sqls = rhs[offset: offset + max_in_list_size]
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sqls_params = rhs_params[offset: offset + max_in_list_size]
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param_group = ', '.join(sqls)
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in_clause_elements.append(param_group)
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in_clause_elements.append(')')
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params.extend(sqls_params)
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in_clause_elements.append(')')
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return ''.join(in_clause_elements), params
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class PatternLookup(BuiltinLookup):
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def get_rhs_op(self, connection, rhs):
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# Assume we are in startswith. We need to produce SQL like:
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# col LIKE %s, ['thevalue%']
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# For python values we can (and should) do that directly in Python,
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# but if the value is for example reference to other column, then
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# we need to add the % pattern match to the lookup by something like
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# col LIKE othercol || '%%'
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# So, for Python values we don't need any special pattern, but for
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# SQL reference values or SQL transformations we need the correct
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# pattern added.
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if hasattr(self.rhs, 'as_sql') or self.bilateral_transforms:
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pattern = connection.pattern_ops[self.lookup_name].format(connection.pattern_esc)
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return pattern.format(rhs)
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else:
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return super().get_rhs_op(connection, rhs)
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@Field.register_lookup
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class Contains(PatternLookup):
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lookup_name = 'contains'
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prepare_rhs = False
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def process_rhs(self, qn, connection):
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rhs, params = super().process_rhs(qn, connection)
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if params and not self.bilateral_transforms:
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params[0] = "%%%s%%" % connection.ops.prep_for_like_query(params[0])
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return rhs, params
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@Field.register_lookup
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class IContains(Contains):
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lookup_name = 'icontains'
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prepare_rhs = False
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@Field.register_lookup
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class StartsWith(PatternLookup):
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lookup_name = 'startswith'
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prepare_rhs = False
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def process_rhs(self, qn, connection):
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rhs, params = super().process_rhs(qn, connection)
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if params and not self.bilateral_transforms:
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params[0] = "%s%%" % connection.ops.prep_for_like_query(params[0])
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return rhs, params
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@Field.register_lookup
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class IStartsWith(PatternLookup):
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lookup_name = 'istartswith'
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prepare_rhs = False
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def process_rhs(self, qn, connection):
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rhs, params = super().process_rhs(qn, connection)
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if params and not self.bilateral_transforms:
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params[0] = "%s%%" % connection.ops.prep_for_like_query(params[0])
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return rhs, params
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@Field.register_lookup
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class EndsWith(PatternLookup):
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lookup_name = 'endswith'
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prepare_rhs = False
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def process_rhs(self, qn, connection):
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rhs, params = super().process_rhs(qn, connection)
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if params and not self.bilateral_transforms:
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params[0] = "%%%s" % connection.ops.prep_for_like_query(params[0])
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return rhs, params
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@Field.register_lookup
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class IEndsWith(PatternLookup):
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lookup_name = 'iendswith'
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prepare_rhs = False
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def process_rhs(self, qn, connection):
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rhs, params = super().process_rhs(qn, connection)
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if params and not self.bilateral_transforms:
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params[0] = "%%%s" % connection.ops.prep_for_like_query(params[0])
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return rhs, params
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@Field.register_lookup
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class Range(FieldGetDbPrepValueIterableMixin, BuiltinLookup):
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lookup_name = 'range'
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def get_rhs_op(self, connection, rhs):
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return "BETWEEN %s AND %s" % (rhs[0], rhs[1])
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@Field.register_lookup
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class IsNull(BuiltinLookup):
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lookup_name = 'isnull'
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prepare_rhs = False
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def as_sql(self, compiler, connection):
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sql, params = compiler.compile(self.lhs)
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if self.rhs:
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return "%s IS NULL" % sql, params
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else:
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return "%s IS NOT NULL" % sql, params
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@Field.register_lookup
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class Regex(BuiltinLookup):
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lookup_name = 'regex'
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prepare_rhs = False
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def as_sql(self, compiler, connection):
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if self.lookup_name in connection.operators:
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return super().as_sql(compiler, connection)
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else:
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lhs, lhs_params = self.process_lhs(compiler, connection)
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rhs, rhs_params = self.process_rhs(compiler, connection)
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sql_template = connection.ops.regex_lookup(self.lookup_name)
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return sql_template % (lhs, rhs), lhs_params + rhs_params
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@Field.register_lookup
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class IRegex(Regex):
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lookup_name = 'iregex'
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class YearLookup(Lookup):
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def year_lookup_bounds(self, connection, year):
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output_field = self.lhs.lhs.output_field
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if isinstance(output_field, DateTimeField):
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bounds = connection.ops.year_lookup_bounds_for_datetime_field(year)
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else:
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bounds = connection.ops.year_lookup_bounds_for_date_field(year)
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return bounds
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class YearComparisonLookup(YearLookup):
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def as_sql(self, compiler, connection):
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# We will need to skip the extract part and instead go
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# directly with the originating field, that is self.lhs.lhs.
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lhs_sql, params = self.process_lhs(compiler, connection, self.lhs.lhs)
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rhs_sql, rhs_params = self.process_rhs(compiler, connection)
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rhs_sql = self.get_rhs_op(connection, rhs_sql)
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start, finish = self.year_lookup_bounds(connection, rhs_params[0])
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params.append(self.get_bound(start, finish))
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return '%s %s' % (lhs_sql, rhs_sql), params
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def get_rhs_op(self, connection, rhs):
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return connection.operators[self.lookup_name] % rhs
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def get_bound(self, start, finish):
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raise NotImplementedError(
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'subclasses of YearComparisonLookup must provide a get_bound() method'
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)
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class YearExact(YearLookup, Exact):
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lookup_name = 'exact'
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def as_sql(self, compiler, connection):
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# We will need to skip the extract part and instead go
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# directly with the originating field, that is self.lhs.lhs.
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lhs_sql, params = self.process_lhs(compiler, connection, self.lhs.lhs)
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rhs_sql, rhs_params = self.process_rhs(compiler, connection)
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try:
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# Check that rhs_params[0] exists (IndexError),
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# it isn't None (TypeError), and is a number (ValueError)
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int(rhs_params[0])
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except (IndexError, TypeError, ValueError):
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# Can't determine the bounds before executing the query, so skip
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# optimizations by falling back to a standard exact comparison.
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return super().as_sql(compiler, connection)
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bounds = self.year_lookup_bounds(connection, rhs_params[0])
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params.extend(bounds)
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return '%s BETWEEN %%s AND %%s' % lhs_sql, params
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class YearGt(YearComparisonLookup):
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lookup_name = 'gt'
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def get_bound(self, start, finish):
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return finish
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class YearGte(YearComparisonLookup):
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lookup_name = 'gte'
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def get_bound(self, start, finish):
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return start
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class YearLt(YearComparisonLookup):
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lookup_name = 'lt'
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def get_bound(self, start, finish):
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return start
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class YearLte(YearComparisonLookup):
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lookup_name = 'lte'
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def get_bound(self, start, finish):
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return finish
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