/usr/lib/python3/dist-packages/sql/__init__.py is in python3-sql 0.4-2.
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#
# Copyright (c) 2011-2013, Cédric Krier
# Copyright (c) 2013, Nicolas Évrard
# Copyright (c) 2011-2013, B2CK
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# * Neither the name of the <organization> nor the
# names of its contributors may be used to endorse or promote products
# derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
__version__ = '0.4'
__all__ = ['Flavor', 'Table', 'Literal', 'Column', 'Join', 'Asc', 'Desc']
import string
from functools import partial
from threading import local, currentThread
from collections import defaultdict
def alias(i, letters=string.ascii_lowercase):
'''
Generate a unique alias based on integer
>>> [alias(n) for n in range(6)]
['a', 'b', 'c', 'd', 'e', 'f']
>>> [alias(n) for n in range(26, 30)]
['ba', 'bb', 'bc', 'bd']
>>> [alias(26**n) for n in range(5)]
['b', 'ba', 'baa', 'baaa', 'baaaa']
'''
s = ''
length = len(letters)
while True:
r = i % length
s = letters[r] + s
i //= length
if i == 0:
break
return s
class Flavor(object):
'''
Contains the flavor of SQL
Contains:
max_limit - limit to use if there is no limit but an offset
paramstyle - state the type of parameter marker formatting
ilike - support ilike extension
function_mapping - dictionary with Function to replace
'''
def __init__(self, max_limit=None, paramstyle='format', ilike=False,
function_mapping=None):
self.max_limit = max_limit
self.paramstyle = paramstyle
self.ilike = ilike
self.function_mapping = function_mapping or {}
@property
def param(self):
if self.paramstyle == 'format':
return '%s'
elif self.paramstyle == 'qmark':
return '?'
@staticmethod
def set(flavor):
'''Set this thread's flavor to flavor.'''
currentThread().__sql_flavor__ = flavor
@staticmethod
def get():
'''
Return this thread's flavor.
If this thread does not yet have a flavor, returns a new flavor and
sets this thread's flavor.
'''
try:
return currentThread().__sql_flavor__
except AttributeError:
flavor = Flavor()
currentThread().__sql_flavor__ = flavor
return flavor
class AliasManager(object):
'''
Context Manager for unique alias generation
'''
__slots__ = ()
local = local()
local.alias = None
local.nested = 0
@classmethod
def __enter__(cls):
if getattr(cls.local, 'alias', None) is None:
cls.local.alias = defaultdict(cls.alias_factory)
cls.local.nested = 0
cls.local.nested += 1
@classmethod
def __exit__(cls, type, value, traceback):
cls.local.nested -= 1
if not cls.local.nested:
cls.local.alias = None
@classmethod
def get(cls, from_):
if getattr(cls.local, 'alias', None) is None:
return ''
return cls.local.alias[from_]
@classmethod
def set(cls, from_, alias):
assert cls.local.alias.get(from_) is None
cls.local.alias[from_] = alias
@classmethod
def alias_factory(cls):
i = len(cls.local.alias)
return alias(i)
class Query(object):
__slots__ = ()
@property
def params(self):
return ()
def __iter__(self):
yield str(self)
yield self.params
class FromItem(object):
__slots__ = ()
@property
def alias(self):
return AliasManager.get(self)
def __getattr__(self, name):
return Column(self, name)
def __add__(self, other):
assert isinstance(other, FromItem)
return From((self, other))
def select(self, *args, **kwargs):
return From((self,)).select(*args, **kwargs)
def join(self, right, type_='INNER', condition=None):
return Join(self, right, type_=type_, condition=condition)
class _SelectQueryMixin(object):
__slots__ = ('__order_by', '__limit', '__offset')
def __init__(self, *args, **kwargs):
self.__order_by = None
self.__limit = None
self.__offset = None
self.order_by = kwargs.pop('order_by', None)
self.limit = kwargs.pop('limit', None)
self.offset = kwargs.pop('offset', None)
super(_SelectQueryMixin, self).__init__(*args, **kwargs)
@property
def order_by(self):
return self.__order_by
@order_by.setter
def order_by(self, value):
if value is not None:
if isinstance(value, Expression):
value = [value]
assert all(isinstance(col, Expression) for col in value)
self.__order_by = value
@property
def _order_by_str(self):
order_by = ''
if self.order_by:
order_by = ' ORDER BY ' + ', '.join(map(str, self.order_by))
return order_by
@property
def limit(self):
return self.__limit
@limit.setter
def limit(self, value):
if value is not None:
assert isinstance(value, int)
self.__limit = value
@property
def _limit_str(self):
limit = ''
if self.limit is not None:
limit = ' LIMIT %s' % self.limit
elif self.offset:
max_limit = Flavor.get().max_limit
if max_limit:
limit = ' LIMIT %s' % max_limit
return limit
@property
def offset(self):
return self.__offset
@offset.setter
def offset(self, value):
if value is not None:
assert isinstance(value, int)
self.__offset = value
@property
def _offset_str(self):
offset = ''
if self.offset:
offset = ' OFFSET %s' % self.offset
return offset
class Select(Query, FromItem, _SelectQueryMixin):
__slots__ = ('__columns', '__where', '__group_by', '__having', '__for_',
'from_')
def __init__(self, columns, from_=None, where=None, group_by=None,
having=None, for_=None, **kwargs):
self.__columns = None
self.__where = None
self.__group_by = None
self.__having = None
self.__for_ = None
super(Select, self).__init__(**kwargs)
# TODO ALL|DISTINCT
self.columns = columns
self.from_ = from_
self.where = where
self.group_by = group_by
self.having = having
self.for_ = for_
@property
def columns(self):
return self.__columns
@columns.setter
def columns(self, value):
assert all(isinstance(col, Expression) for col in value)
self.__columns = tuple(value)
@property
def where(self):
return self.__where
@where.setter
def where(self, value):
from sql.operators import And, Or
if value is not None:
assert isinstance(value, (Expression, And, Or))
self.__where = value
@property
def group_by(self):
return self.__group_by
@group_by.setter
def group_by(self, value):
if value is not None:
if isinstance(value, Expression):
value = [value]
assert all(isinstance(col, Expression) for col in value)
self.__group_by = value
@property
def having(self):
return self.__having
@having.setter
def having(self, value):
from sql.operators import And, Or
if value is not None:
assert isinstance(value, (Expression, And, Or))
self.__having = value
@property
def for_(self):
return self.__for_
@for_.setter
def for_(self, value):
if value is not None:
if isinstance(value, For):
value = [value]
assert all(isinstance(f, For) for f in value)
self.__for_ = value
@staticmethod
def _format_column(column):
if isinstance(column, As):
return '%s AS %s' % (column.expression, column)
else:
return str(column)
def __str__(self):
with AliasManager():
from_ = str(self.from_)
if self.columns:
columns = ', '.join(map(self._format_column, self.columns))
else:
columns = '*'
where = ''
if self.where:
where = ' WHERE ' + str(self.where)
group_by = ''
if self.group_by:
group_by = ' GROUP BY ' + ', '.join(map(str, self.group_by))
having = ''
if self.having:
having = ' HAVING ' + str(self.having)
for_ = ''
if self.for_ is not None:
for_ = ' ' + ' '.join(map(str, self.for_))
return ('SELECT %s FROM %s' % (columns, from_) + where + group_by
+ having + self._order_by_str + self._limit_str +
self._offset_str + for_)
@property
def params(self):
p = []
for column in self.columns:
if isinstance(column, As):
p.extend(column.expression.params)
p.extend(column.params)
p.extend(self.from_.params)
if self.where:
p.extend(self.where.params)
if self.group_by:
for expression in self.group_by:
p.extend(expression.params)
if self.having:
p.extend(self.having.params)
if self.order_by:
for expression in self.order_by:
p.extend(expression.params)
return tuple(p)
def __or__(self, other):
return Union(self, other)
def __and__(self, other):
return Interesect(self, other)
def __sub__(self, other):
return Except(self, other)
class Insert(Query):
__slots__ = ('__table', '__columns', '__values', '__returning')
def __init__(self, table, columns=None, values=None, returning=None):
self.__table = None
self.__columns = None
self.__values = None
self.__returning = None
self.table = table
self.columns = columns
self.values = values
self.returning = returning
@property
def table(self):
return self.__table
@table.setter
def table(self, value):
assert isinstance(value, Table)
self.__table = value
@property
def columns(self):
return self.__columns
@columns.setter
def columns(self, value):
if value is not None:
assert all(isinstance(col, Column) for col in value)
assert all(col.table == self.table for col in value)
self.__columns = value
@property
def values(self):
return self.__values
@values.setter
def values(self, value):
if value is not None:
assert isinstance(value, (list, Select))
self.__values = value
@property
def returning(self):
return self.__returning
@returning.setter
def returning(self, value):
if value is not None:
assert isinstance(value, list)
self.__returning = value
@staticmethod
def _format(value, param=None):
if param is None:
param = Flavor.get().param
if isinstance(value, Expression):
return str(value)
elif isinstance(value, Select):
return '(%s)' % value
else:
return param
def __str__(self):
columns = ''
if self.columns:
assert all(col.table == self.table for col in self.columns)
columns = ' (' + ', '.join(map(str, self.columns)) + ')'
if isinstance(self.values, list):
format_ = partial(self._format, param=Flavor.get().param)
values = ' VALUES ' + ', '.join(
'(' + ', '.join(map(format_, v)) + ')'
for v in self.values)
# TODO manage DEFAULT
elif isinstance(self.values, Select):
values = ' %s' % str(self.values)
elif self.values is None:
values = ' DEFAULT VALUES'
returning = ''
if self.returning:
returning = ' RETURNING ' + ', '.join(map(str, self.returning))
return 'INSERT INTO %s' % self.table + columns + values + returning
@property
def params(self):
p = []
if isinstance(self.values, list):
for values in self.values:
for value in values:
if isinstance(value, (Expression, Select)):
p.extend(value.params)
else:
p.append(value)
elif isinstance(self.values, Select):
p.extend(self.values.params)
if self.returning:
for exp in self.returning:
p.extend(exp.params)
return tuple(p)
class Update(Insert):
__slots__ = ('__where', '__values', 'from_')
def __init__(self, table, columns, values, from_=None, where=None,
returning=None):
super(Update, self).__init__(table, columns=columns, values=values,
returning=returning)
self.__where = None
self.from_ = From(from_) if from_ else None
self.where = where
@property
def values(self):
return self.__values
@values.setter
def values(self, value):
if isinstance(value, Select):
value = [value]
assert isinstance(value, list)
self.__values = value
@property
def where(self):
return self.__where
@where.setter
def where(self, value):
from sql.operators import And, Or
if value is not None:
assert isinstance(value, (Expression, And, Or))
self.__where = value
def __str__(self):
assert all(col.table == self.table for col in self.columns)
# Get columns without alias
columns = list(map(str, self.columns))
with AliasManager():
from_ = ''
if self.from_:
table = From([self.table])
from_ = ' FROM %s' % str(self.from_)
else:
table = self.table
AliasManager.set(table, str(table)[1:-1])
values = ', '.join('%s = %s' % (c, self._format(v))
for c, v in zip(columns, self.values))
where = ''
if self.where:
where = ' WHERE ' + str(self.where)
returning = ''
if self.returning:
returning = ' RETURNING ' + ', '.join(map(str, self.returning))
return ('UPDATE %s SET ' % table + values + from_ + where
+ returning)
@property
def params(self):
p = []
for value in self.values:
if isinstance(value, (Expression, Select)):
p.extend(value.params)
else:
p.append(value)
if self.from_:
p.extend(self.from_.params)
if self.where:
p.extend(self.where.params)
if self.returning:
for exp in self.returning:
p.extend(exp.params)
return tuple(p)
class Delete(Query):
__slots__ = ('__table', '__where', '__returning', 'only')
def __init__(self, table, only=False, using=None, where=None,
returning=None):
self.__table = None
self.__where = None
self.__returning = None
self.table = table
self.only = only
# TODO using (not standard)
self.where = where
self.returning = returning
@property
def table(self):
return self.__table
@table.setter
def table(self, value):
assert isinstance(value, Table)
self.__table = value
@property
def where(self):
return self.__where
@where.setter
def where(self, value):
from sql.operators import And, Or
if value is not None:
assert isinstance(value, (Expression, And, Or))
self.__where = value
@property
def returning(self):
return self.__returning
@returning.setter
def returning(self, value):
if value is not None:
assert isinstance(value, list)
self.__returning = value
def __str__(self):
only = ' ONLY' if self.only else ''
where = ''
if self.where:
where = ' WHERE ' + str(self.where)
returning = ''
if self.returning:
returning = ' RETURNING ' + ', '.join(map(str, self.returning))
return 'DELETE FROM%s %s' % (only, self.table) + where + returning
@property
def params(self):
p = []
if self.where:
p.extend(self.where.params)
if self.returning:
for exp in self.returning:
p.extend(exp.params)
return tuple(p)
class CombiningQuery(Query, FromItem, _SelectQueryMixin):
__slots__ = ('queries', 'all_')
_operator = ''
def __init__(self, *queries, **kwargs):
assert all(isinstance(q, _SelectQueryMixin) for q in queries)
self.queries = queries
self.all_ = kwargs.pop('all_', False)
super(CombiningQuery, self).__init__(**kwargs)
def __str__(self):
with AliasManager():
operator = ' %s %s' % (self._operator, 'ALL ' if self.all_ else '')
return (operator.join(map(str, self.queries)) + self._order_by_str
+ self._limit_str + self._offset_str)
@property
def params(self):
p = []
for q in self.queries:
p.extend(q.params)
if self.order_by:
for expression in self.order_by:
p.extend(expression.params)
return tuple(p)
class Union(CombiningQuery):
__slots__ = ()
_operator = 'UNION'
class Interesect(CombiningQuery):
__slots__ = ()
_operator = 'INTERSECT'
class Except(CombiningQuery):
__slots__ = ()
_operator = 'EXCEPT'
class Table(FromItem):
__slots__ = '__name'
def __init__(self, name):
super(Table, self).__init__()
self.__name = name
def __str__(self):
return '"%s"' % self.__name
@property
def params(self):
return ()
def insert(self, columns=None, values=None, returning=None):
return Insert(self, columns=columns, values=values,
returning=returning)
def update(self, columns, values, from_=None, where=None, returning=None):
return Update(self, columns=columns, values=values, from_=from_,
where=where, returning=returning)
def delete(self, only=False, using=None, where=None, returning=None):
return Delete(self, only=only, using=using, where=where,
returning=returning)
class Join(FromItem):
__slots__ = ('__left', '__right', '__condition', '__type_')
def __init__(self, left, right, type_='INNER', condition=None):
super(Join, self).__init__()
self.__left, self.__right = None, None
self.__condition = None
self.__type_ = None
self.left = left
self.right = right
self.condition = condition
self.type_ = type_
@property
def left(self):
return self.__left
@left.setter
def left(self, value):
assert isinstance(value, FromItem)
self.__left = value
@property
def right(self):
return self.__right
@right.setter
def right(self, value):
assert isinstance(value, FromItem)
self.__right = value
@property
def condition(self):
return self.__condition
@condition.setter
def condition(self, value):
from sql.operators import And, Or
if value is not None:
assert isinstance(value, (Expression, And, Or))
self.__condition = value
@property
def type_(self):
return self.__type_
@type_.setter
def type_(self, value):
value = value.upper()
assert value in ('INNER', 'LEFT', 'LEFT OUTER',
'RIGHT', 'RIGHT OUTER', 'FULL', 'FULL OUTER', 'CROSS')
self.__type_ = value
def __str__(self):
join = '%s %s JOIN %s' % (From([self.left]), self.type_,
From([self.right]))
if self.condition:
condition = ' ON %s' % self.condition
else:
condition = ''
return join + condition
@property
def params(self):
p = []
for item in (self.left, self.right):
if hasattr(item, 'params'):
p.extend(item.params)
if hasattr(self.condition, 'params'):
p.extend(self.condition.params)
return tuple(p)
@property
def alias(self):
raise AttributeError
def __getattr__(self, name):
raise AttributeError
def select(self, *args, **kwargs):
return super(Join, self).select(*args, **kwargs)
class From(list):
__slots__ = ()
def select(self, *args, **kwargs):
return Select(args, from_=self, **kwargs)
def __str__(self):
def format(from_):
if isinstance(from_, Query):
return '(%s) AS "%s"' % (from_, from_.alias)
else:
alias = getattr(from_, 'alias', None)
columns_definitions = getattr(from_, 'columns_definitions',
None)
# XXX find a better test for __getattr__ which returns Column
if (alias and columns_definitions
and not isinstance(columns_definitions, Column)):
return '%s AS "%s" (%s)' % (from_, alias,
columns_definitions)
elif alias:
return '%s AS "%s"' % (from_, alias)
else:
return str(from_)
return ', '.join(map(format, self))
@property
def params(self):
p = []
for from_ in self:
p.extend(from_.params)
return tuple(p)
def __add__(self, other):
assert isinstance(other, FromItem)
assert not isinstance(other, CombiningQuery)
return From(super(From, self).__add__([other]))
class Expression(object):
__slots__ = ()
def __str__(self):
raise NotImplementedError
@property
def params(self):
raise NotImplementedError
def __and__(self, other):
from sql.operators import And
return And((self, other))
def __or__(self, other):
from sql.operators import Or
return Or((self, other))
def __invert__(self):
from sql.operators import Not
return Not(self)
def __add__(self, other):
from sql.operators import Add
return Add(self, other)
def __sub__(self, other):
from sql.operators import Sub
return Sub(self, other)
def __mul__(self, other):
from sql.operators import Mul
return Mul(self, other)
def __div__(self, other):
from sql.operators import Div
return Div(self, other)
__truediv__ = __div__
def __floordiv__(self, other):
from sql.functions import Div
return Div(self, other)
def __mod__(self, other):
from sql.operators import Mod
return Mod(self, other)
def __pow__(self, other):
from sql.operators import Pow
return Pow(self, other)
def __neg__(self):
from sql.operators import Neg
return Neg(self)
def __pos__(self):
from sql.operators import Pos
return Pos(self)
def __abs__(self):
from sql.operators import Abs
return Abs(self)
def __lshift__(self, other):
from sql.operators import LShift
return LShift(self, other)
def __rshift__(self, other):
from sql.operators import RShift
return RShift(self, other)
def __lt__(self, other):
from sql.operators import Less
return Less(self, other)
def __le__(self, other):
from sql.operators import LessEqual
return LessEqual(self, other)
def __eq__(self, other):
from sql.operators import Equal
return Equal(self, other)
# When overriding __eq__, __hash__ is implicitly set to None
__hash__ = object.__hash__
def __ne__(self, other):
from sql.operators import NotEqual
return NotEqual(self, other)
def __gt__(self, other):
from sql.operators import Greater
return Greater(self, other)
def __ge__(self, other):
from sql.operators import GreaterEqual
return GreaterEqual(self, other)
def in_(self, values):
from sql.operators import In
return In(self, values)
def like(self, test):
from sql.operators import Like
return Like(self, test)
def ilike(self, test):
from sql.operators import ILike
return ILike(self, test)
def as_(self, output_name):
return As(self, output_name)
def cast(self, typename):
return Cast(self, typename)
@property
def asc(self):
return Asc(self)
@property
def desc(self):
return Desc(self)
class Literal(Expression):
__slots__ = ('__value')
def __init__(self, value):
super(Literal, self).__init__()
self.__value = value
@property
def value(self):
return self.__value
def __str__(self):
return Flavor.get().param
@property
def params(self):
return (self.__value,)
Null = None
class Column(Expression):
__slots__ = ('__from', '__name')
def __init__(self, from_, name):
super(Column, self).__init__()
self.__from = from_
self.__name = name
@property
def table(self):
return self.__from
@property
def name(self):
return self.__name
def __str__(self):
if self.__name == '*':
t = '%s'
else:
t = '"%s"'
alias = self.__from.alias
if alias:
t = '"%s".' + t
return t % (alias, self.__name)
else:
return t % self.__name
@property
def params(self):
return ()
class As(Expression):
__slots__ = ('expression', 'output_name')
def __init__(self, expression, output_name):
super(As, self).__init__()
self.expression = expression
self.output_name = output_name
def __str__(self):
return '"%s"' % self.output_name
@property
def params(self):
return ()
class Cast(Expression):
__slots__ = ('expression', 'typename')
def __init__(self, expression, typename):
super(Expression, self).__init__()
self.expression = expression
self.typename = typename
def __str__(self):
if isinstance(self.expression, Expression):
value = self.expression
else:
value = Flavor.get().param
return 'CAST(%s AS %s)' % (value, self.typename)
@property
def params(self):
if isinstance(self.expression, Expression):
return self.expression.params
else:
return (self.expression,)
class Order(Expression):
__slots__ = ('expression')
_sql = ''
def __init__(self, expression):
super(Order, self).__init__()
self.expression = expression
# TODO USING
def __str__(self):
return '%s %s' % (self.expression, self._sql)
@property
def params(self):
return self.expression.params
class Asc(Order):
__slots__ = ()
_sql = 'ASC'
class Desc(Order):
__slots__ = ()
_sql = 'DESC'
class For(object):
__slots__ = ('__tables', '__type_', 'nowait')
def __init__(self, type_, *tables, **kwargs):
self.__tables = None
self.__type_ = None
self.tables = list(tables)
self.type_ = type_
self.nowait = kwargs.get('nowait')
@property
def tables(self):
return self.__tables
@tables.setter
def tables(self, value):
if not isinstance(value, list):
value = [value]
all(isinstance(table, Table) for table in value)
self.__tables = value
@property
def type_(self):
return self.__type_
@type_.setter
def type_(self, value):
value = value.upper()
assert value in ('UPDATE', 'SHARE')
self.__type_ = value
def __str__(self):
tables = ''
if self.tables:
tables = ' OF ' + ', '.join(map(str, self.tables))
nowait = ''
if self.nowait:
nowait = ' NOWAIT'
return ('FOR %s' % self.type_) + tables + nowait
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