mirror of
https://github.com/psycopg/psycopg2.git
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203 lines
6.7 KiB
Python
203 lines
6.7 KiB
Python
# ZPsycopgDA/DA.py - ZPsycopgDA Zope product: Database Connection
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#
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# Copyright (C) 2004 Federico Di Gregorio <fog@initd.org>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by the
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# Free Software Foundation; either version 2, or (at your option) any later
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# version.
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#
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# Or, at your option this program (ZPsycopgDA) can be distributed under the
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# Zope Public License (ZPL) Version 1.0, as published on the Zope web site,
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# http://www.zope.org/Resources/ZPL.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY
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# or FITNESS FOR A PARTICULAR PURPOSE.
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#
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# See the LICENSE file for details.
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ALLOWED_PSYCOPG_VERSIONS = ('1.99.9',)
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import sys
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import db
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import DABase
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import Shared.DC.ZRDB.Connection
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from db import DB
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from Globals import DTMLFile
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from Globals import HTMLFile
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from ImageFile import ImageFile
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from ExtensionClass import Base
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from DateTime import DateTime
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# import psycopg and functions/singletons needed for date/time conversions
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import psycopg
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from psycopg import DATETIME
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from psycopg.extensions import TIME, DATE, INTERVAL
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from psycopg.extensions import new_type, register_type
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# add a new connection to a folder
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manage_addZPsycopgConnectionForm = DTMLFile('dtml/add',globals())
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def manage_addZPsycopgConnection(self, id, title, connection_string,
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zdatetime=None, tilevel=2,
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check=None, REQUEST=None):
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"""Add a DB connection to a folder."""
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self._setObject(id, Connection(id, title, connection_string,
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zdatetime, check, tilevel))
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if REQUEST is not None: return self.manage_main(self, REQUEST)
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# the connection object
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class Connection(DABase.Connection):
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"""ZPsycopg Connection."""
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id = 'Psycopg_database_connection'
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database_type = 'Psycopg'
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meta_type = title = 'Z Psycopg Database Connection'
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icon = 'misc_/ZPsycopg/conn'
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def __init__(self, id, title, connection_string,
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zdatetime, check=None, tilevel=2, encoding=''):
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self.zdatetime = zdatetime
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self.id = str(id)
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self.edit(title, connection_string, zdatetime,
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check=check, tilevel=tilevel, encoding=encoding)
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def factory(self):
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return DB
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def table_info(self):
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return self._v_database_connection.table_info()
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def edit(self, title, connection_string,
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zdatetime, check=None, tilevel=2, encoding=''):
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self.title = title
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self.connection_string = connection_string
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self.zdatetime = zdatetime
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self.tilevel = tilevel
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self.encoding = encoding
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self.set_type_casts()
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if check: self.connect(self.connection_string)
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manage_properties = DTMLFile('dtml/edit', globals())
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def manage_edit(self, title, connection_string,
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zdatetime=None, check=None, tilevel=2, encoding='UTF-8',
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REQUEST=None):
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"""Edit the DB connection."""
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self.edit(title, connection_string, zdatetime,
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check=check, tilevel=tilevel, encoding=encoding)
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if REQUEST is not None:
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msg = "Connection edited."
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return self.manage_main(self,REQUEST,manage_tabs_message=msg)
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def connect(self, s):
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try:
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self._v_database_connection.close()
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except:
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pass
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# check psycopg version and raise exception if does not match
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if psycopg.__version__ not in ALLOWED_PSYCOPG_VERSIONS:
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raise ImportError("psycopg version mismatch (imported %s)" +
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psycopg.__version__)
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self.set_type_casts()
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self._v_connected = ''
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dbf = self.factory()
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# TODO: let the psycopg exception propagate, or not?
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self._v_database_connection = dbf(
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self.connection_string, self.tilevel, self.encoding)
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self._v_database_connection.open()
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self._v_connected = DateTime()
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return self
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def set_type_casts(self):
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# note that in both cases order *is* important
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if self.zdatetime:
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# use zope internal datetime routines
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register_type(ZDATETIME)
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register_type(ZDATE)
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register_type(ZTIME)
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register_type(ZINTERVAL)
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else:
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# use the standard
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register_type(DATETIME)
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register_type(DATE)
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register_type(TIME)
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register_type(INTERVAL)
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# database connection registration data
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classes = (Connection,)
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meta_types = ({'name':'Z Psycopg Database Connection',
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'action':'manage_addZPsycopgConnectionForm'},)
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folder_methods = {
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'manage_addZPsycopgConnection': manage_addZPsycopgConnection,
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'manage_addZPsycopgConnectionForm': manage_addZPsycopgConnectionForm}
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__ac_permissions__ = (
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('Add Z Psycopg Database Connections',
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('manage_addZPsycopgConnectionForm', 'manage_addZPsycopgConnection')),)
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# add icons
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misc_={'conn': ImageFile('Shared/DC/ZRDB/www/DBAdapterFolder_icon.gif')}
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for icon in ('table', 'view', 'stable', 'what', 'field', 'text', 'bin',
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'int', 'float', 'date', 'time', 'datetime'):
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misc_[icon] = ImageFile('icons/%s.gif' % icon, globals())
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# zope-specific psycopg typecasters
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# convert an ISO timestamp string from postgres to a Zope DateTime object
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def _cast_DateTime(str):
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if str:
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# this will split us into [date, time, GMT/AM/PM(if there)]
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dt = split(str, ' ')
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if len(dt) > 1:
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# we now should split out any timezone info
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dt[1] = split(dt[1], '-')[0]
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dt[1] = split(dt[1], '+')[0]
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return DateTime(join(dt[:2], ' '))
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else:
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return DateTime(dt[0])
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# convert an ISO date string from postgres to a Zope DateTime object
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def _cast_Date(str):
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if str:
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return DateTime(str)
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# Convert a time string from postgres to a Zope DateTime object.
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# NOTE: we set the day as today before feeding to DateTime so
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# that it has the same DST settings.
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def _cast_Time(str):
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if str:
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return DateTime(time.strftime('%Y-%m-%d %H:%M:%S',
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time.localtime(time.time())[:3]+
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time.strptime(str[:8], "%H:%M:%S")[3:]))
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# TODO: DateTime does not support intervals: what's the best we can do?
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def _cast_Interval(str):
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return str
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ZDATETIME = new_type((1184, 1114), "ZDATETIME", _cast_DateTime)
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ZINTERVAL = new_type((1186,), "ZINTERVAL", _cast_Interval)
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ZDATE = new_type((1082,), "ZDATE", _cast_Date)
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ZTIME = new_type((1083,), "ZTIME", _cast_Time)
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