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legacyinteger.py
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Tue, Aug 6, 22:50
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R3600 invenio-infoscience
legacyinteger.py
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# -*- coding: utf-8 -*-
#
# This file is part of Invenio.
# Copyright (C) 2011, 2012, 2013, 2014, 2015 CERN.
#
# Invenio is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 2 of the
# License, or (at your option) any later version.
#
# Invenio is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Invenio; if not, write to the Free Software Foundation, Inc.,
# 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
"""Platform-independent Integer type."""
from
sqlalchemy.dialects.mysql
import
INTEGER
from
sqlalchemy.types
import
Integer
,
TypeDecorator
class
LegacyInteger
(
TypeDecorator
):
"""Platform-independent Integer type.
Uses MySQL's :class:`~sqlalchemy.dialects.mysql.INTEGER` type, otherwise
uses SQLAlchemy definition of :class:`~sqlalchemy.types.Integer`.
"""
impl
=
Integer
def
__init__
(
self
,
display_width
=
15
,
unsigned
=
False
,
**
kwargs
):
"""Reserve special arguments only for MySQL Platform."""
self
.
display_width
=
display_width
self
.
unsigned
=
unsigned
super
(
LegacyInteger
,
self
)
.
__init__
(
**
kwargs
)
def
load_dialect_impl
(
self
,
dialect
):
"""Load dialect dependent implementation."""
if
dialect
.
name
==
'mysql'
:
return
dialect
.
type_descriptor
(
INTEGER
(
self
.
display_width
,
unsigned
=
self
.
unsigned
))
else
:
return
dialect
.
type_descriptor
(
Integer
)
def
process_result_value
(
self
,
value
,
dialect
):
"""Cast to long python variable."""
if
value
is
not
None
:
return
long
(
value
)
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