373 lines
11 KiB
Python
373 lines
11 KiB
Python
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# ZPsycopgDA/DA.py - ZPsycopgDA Zope product: Database Connection
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#
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# Copyright (C) 2004-2010 Federico Di Gregorio <fog@debian.org>
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#
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# psycopg2 is free software: you can redistribute it and/or modify it
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# under the terms of the GNU Lesser General Public License as published
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# by the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# psycopg2 is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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# License for more details.
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# Import modules needed by _psycopg to allow tools like py2exe to do
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# their work without bothering about the module dependencies.
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import sys
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import time
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import db
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import re
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import Acquisition
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import Shared.DC.ZRDB.Connection
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from db import DB
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from Globals import HTMLFile
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from ExtensionClass import Base
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from App.Dialogs import MessageDialog
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from DateTime import DateTime
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# ImageFile is deprecated in Zope >= 2.9
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try:
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from App.ImageFile import ImageFile
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except ImportError:
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# Zope < 2.9. If PIL's installed with a .pth file, we're probably
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# hosed.
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from ImageFile import ImageFile
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# import psycopg and functions/singletons needed for date/time conversions
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import psycopg2
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from psycopg2 import NUMBER, STRING, ROWID, DATETIME
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from psycopg2.extensions import INTEGER, LONGINTEGER, FLOAT, BOOLEAN, DATE
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from psycopg2.extensions import TIME, INTERVAL
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from psycopg2.extensions import new_type, register_type
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# add a new connection to a folder
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manage_addZPsycopgConnectionForm = HTMLFile('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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encoding='', 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, encoding))
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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(Shared.DC.ZRDB.Connection.Connection):
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"""ZPsycopg Connection."""
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_isAnSQLConnection = 1
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id = 'Psycopg2_database_connection'
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database_type = 'Psycopg2'
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meta_type = title = 'Z Psycopg 2 Database Connection'
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icon = 'misc_/conn'
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def __init__(self, id, title, connection_string,
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zdatetime, check=None, tilevel=2, encoding='UTF-8'):
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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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## connection parameters editing ##
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def edit(self, title, connection_string,
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zdatetime, check=None, tilevel=2, encoding='UTF-8'):
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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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if check: self.connect(self.connection_string)
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manage_properties = HTMLFile('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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check_psycopg_version(psycopg2.__version__)
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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.get_type_casts(), 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 get_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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return ZDATETIME, ZDATE, ZTIME
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else:
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return DATETIME, DATE, TIME
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## browsing and table/column management ##
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manage_options = Shared.DC.ZRDB.Connection.Connection.manage_options
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# + (
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# {'label': 'Browse', 'action':'manage_browse'},)
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#manage_tables = HTMLFile('dtml/tables', globals())
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#manage_browse = HTMLFile('dtml/browse', globals())
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info = None
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def table_info(self):
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return self._v_database_connection.table_info()
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def __getitem__(self, name):
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if name == 'tableNamed':
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if not hasattr(self, '_v_tables'): self.tpValues()
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return self._v_tables.__of__(self)
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raise KeyError, name
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def tpValues(self):
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res = []
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conn = self._v_database_connection
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for d in conn.tables(rdb=0):
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try:
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name = d['TABLE_NAME']
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b = TableBrowser()
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b.__name__ = name
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b._d = d
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b._c = c
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try:
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b.icon = table_icons[d['TABLE_TYPE']]
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except:
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pass
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r.append(b)
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except:
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pass
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return res
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def check_psycopg_version(version):
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"""
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Check that the psycopg version used is compatible with the zope adpter.
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"""
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try:
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m = re.match(r'\d+\.\d+(\.\d+)?', version.split(' ')[0])
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tver = tuple(map(int, m.group().split('.')))
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except:
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raise ImportError("failed to parse psycopg version %s" % version)
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if tver < (2, 4):
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raise ImportError("psycopg version %s is too old" % version)
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if tver in ((2,4,2), (2,4,3)):
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raise ImportError("psycopg version %s is known to be buggy" % version)
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## database connection registration data ##
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classes = (Connection,)
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meta_types = ({'name':'Z Psycopg 2 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('icons/DBAdapterFolder_icon.gif', globals())}
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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(iso, curs):
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if iso:
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if iso in ['-infinity', 'infinity']:
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return iso
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else:
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return DateTime(iso)
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# convert an ISO date string from postgres to a Zope DateTime object
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def _cast_Date(iso, curs):
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if iso:
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if iso in ['-infinity', 'infinity']:
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return iso
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else:
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return DateTime(iso)
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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(iso, curs):
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if iso:
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if iso in ['-infinity', 'infinity']:
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return iso
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else:
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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(iso[:8], "%H:%M:%S")[3:]))
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# NOTE: we don't cast intervals anymore because they are passed
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# untouched to Zope.
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def _cast_Interval(iso, curs):
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return iso
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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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## table browsing helpers ##
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class TableBrowserCollection(Acquisition.Implicit):
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pass
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class Browser(Base):
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def __getattr__(self, name):
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try:
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return self._d[name]
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except KeyError:
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raise AttributeError, name
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class values:
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def len(self):
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return 1
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def __getitem__(self, i):
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try:
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return self._d[i]
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except AttributeError:
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pass
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self._d = self._f()
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return self._d[i]
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class TableBrowser(Browser, Acquisition.Implicit):
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icon = 'what'
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Description = check = ''
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info = HTMLFile('table_info', globals())
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menu = HTMLFile('table_menu', globals())
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def tpValues(self):
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v = values()
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v._f = self.tpValues_
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return v
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def tpValues_(self):
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r=[]
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tname=self.__name__
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for d in self._c.columns(tname):
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b=ColumnBrowser()
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b._d=d
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try: b.icon=field_icons[d['Type']]
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except: pass
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b.TABLE_NAME=tname
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r.append(b)
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return r
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def tpId(self): return self._d['TABLE_NAME']
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def tpURL(self): return "Table/%s" % self._d['TABLE_NAME']
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def Name(self): return self._d['TABLE_NAME']
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def Type(self): return self._d['TABLE_TYPE']
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manage_designInput=HTMLFile('designInput',globals())
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def manage_buildInput(self, id, source, default, REQUEST=None):
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"Create a database method for an input form"
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args=[]
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values=[]
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names=[]
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columns=self._columns
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for i in range(len(source)):
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s=source[i]
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if s=='Null': continue
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c=columns[i]
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d=default[i]
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t=c['Type']
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n=c['Name']
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names.append(n)
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if s=='Argument':
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values.append("<dtml-sqlvar %s type=%s>'" %
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(n, vartype(t)))
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a='%s%s' % (n, boboType(t))
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if d: a="%s=%s" % (a,d)
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args.append(a)
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elif s=='Property':
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values.append("<dtml-sqlvar %s type=%s>'" %
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(n, vartype(t)))
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else:
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if isStringType(t):
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if find(d,"\'") >= 0: d=join(split(d,"\'"),"''")
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values.append("'%s'" % d)
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elif d:
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values.append(str(d))
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else:
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raise ValueError, (
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'no default was given for <em>%s</em>' % n)
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class ColumnBrowser(Browser):
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icon='field'
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def check(self):
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return ('\t<input type=checkbox name="%s.%s">' %
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(self.TABLE_NAME, self._d['Name']))
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def tpId(self): return self._d['Name']
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def tpURL(self): return "Column/%s" % self._d['Name']
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def Description(self):
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d=self._d
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if d['Scale']:
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return " %(Type)s(%(Precision)s,%(Scale)s) %(Nullable)s" % d
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else:
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return " %(Type)s(%(Precision)s) %(Nullable)s" % d
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table_icons={
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'TABLE': 'table',
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'VIEW':'view',
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'SYSTEM_TABLE': 'stable',
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}
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field_icons={
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NUMBER.name: 'i',
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STRING.name: 'text',
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DATETIME.name: 'date',
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INTEGER.name: 'int',
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FLOAT.name: 'float',
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BOOLEAN.name: 'bin',
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ROWID.name: 'int'
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}
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