PyDBI.py :  » Web-Server » SkunkWEB » skunkweb-3.4.4 » pylibs » PyDO » Python Open Source

Home
Python Open Source
1.3.1.2 Python
2.Ajax
3.Aspect Oriented
4.Blog
5.Build
6.Business Application
7.Chart Report
8.Content Management Systems
9.Cryptographic
10.Database
11.Development
12.Editor
13.Email
14.ERP
15.Game 2D 3D
16.GIS
17.GUI
18.IDE
19.Installer
20.IRC
21.Issue Tracker
22.Language Interface
23.Log
24.Math
25.Media Sound Audio
26.Mobile
27.Network
28.Parser
29.PDF
30.Project Management
31.RSS
32.Search
33.Security
34.Template Engines
35.Test
36.UML
37.USB Serial
38.Web Frameworks
39.Web Server
40.Web Services
41.Web Unit
42.Wiki
43.Windows
44.XML
Python Open Source » Web Server » SkunkWEB 
SkunkWEB » skunkweb 3.4.4 » pylibs » PyDO » PyDBI.py
#  
#  Copyright (C) 2001 Andrew T. Csillag <drew_csillag@geocities.com>
#  
#      You may distribute under the terms of either the GNU General
#      Public License or the SkunkWeb License, as specified in the
#      README file.
#   
import types

class SYSDATE: pass

##############################
## connection registry stuff
##############################
_driverConfig = {
    #driver name   module name    class in module
    'mysql':       ('mysqlconn',   'PyDOMySQL'),
    'oracle':      ('oracleconn',  'PyDOOracle'),
    'postgresql':  ('postconn',    'PyDOPostgreSQL'),
    'pypgsql':      ('pypgsqlconn', 'PyDOPostgreSQL'),
    'psycopg':      ('psycopgconn', 'PyDOPostgreSQL'),
    'sapdb':       ('sapdbconn',   'PyDOsapdb'),
    'sqlite':      ('sqliteconn',  'PyDOSqlite'),
    }
_loadedDrivers = {}

_aliasToConnArgs= {}
_aliasToConnections = {}

def DBIInitAlias(alias, connectArgs):
    _aliasToConnArgs[alias] = connectArgs

def DBIGetConnection(alias):
    if alias is None:
        raise ValueError, 'connection alias is None!'

    if not _aliasToConnections.has_key(alias):
        connArgs = _aliasToConnArgs.get(alias)
        if not connArgs:
            raise ValueError, "alias %s not recognized" % alias
        argType=type(connArgs)
        if argType in (types.StringType, types.UnicodeType):
            if connArgs[:5] != 'pydo:':
                raise ValueError, ("invalid connect string: doesn't start"
                                   " with pydo: <%s>") % connArgs
            rconnString = connArgs[5:]
            colInd = rconnString.index(':')
            driverName = rconnString[:colInd]
            driverArgs = rconnString[colInd+1:]
        elif argType==types.DictType:
            driverName=connArgs.get('driver')
            if not driverName:
                raise ValueError, "no driver specified!"
            driverArgs=connArgs.copy()
            del driverArgs['driver']
        _aliasToConnections[alias]=_getDriver(driverName)(driverArgs)
            
    return _aliasToConnections[alias]

def _getDriver(driverName):
    if not _loadedDrivers.has_key(driverName):
        mod, attr = _driverConfig[driverName]
        PyDOMod = __import__('PyDO.'+ mod)
        driverMod = getattr(PyDOMod, mod)
        _loadedDrivers[driverName] = getattr(driverMod, attr)
        
    return _loadedDrivers[driverName]
    
www.java2java.com | Contact Us
Copyright 2009 - 12 Demo Source and Support. All rights reserved.
All other trademarks are property of their respective owners.