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annotate roundup/backends/__init__.py @ 2856:adec352e2ce0

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don't try to import all backends in backends.__init__ unless we *want* to
author Richard Jones <richard@users.sourceforge.net>
date Wed, 03 Nov 2004 01:34:21 +0000
parents 66db6834fcd5
children e54c95de4c6a
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1 #
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2 # Copyright (c) 2001 Bizar Software Pty Ltd (http://www.bizarsoftware.com.au/)
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3 # This module is free software, and you may redistribute it and/or modify
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4 # under the same terms as Python, so long as this copyright message and
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5 # disclaimer are retained in their original form.
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6 #
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7 # IN NO EVENT SHALL BIZAR SOFTWARE PTY LTD BE LIABLE TO ANY PARTY FOR
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8 # DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING
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9 # OUT OF THE USE OF THIS CODE, EVEN IF THE AUTHOR HAS BEEN ADVISED OF THE
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10 # POSSIBILITY OF SUCH DAMAGE.
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11 #
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12 # BIZAR SOFTWARE PTY LTD SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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13 # BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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14 # FOR A PARTICULAR PURPOSE. THE CODE PROVIDED HEREUNDER IS ON AN "AS IS"
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15 # BASIS, AND THERE IS NO OBLIGATION WHATSOEVER TO PROVIDE MAINTENANCE,
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16 # SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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17 #
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18 # $Id: __init__.py,v 1.29 2004-11-03 01:34:21 richard Exp $
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19
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20 '''Container for the hyperdb storage backend implementations.
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21 '''
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22 __docformat__ = 'restructuredtext'
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24 _modules = {
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25 'mysql': 'MySQLdb',
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26 'postgresql': 'psycopg',
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27 }
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29 def get_backend(name):
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30 '''Get a specific backend by name.'''
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31 return __import__('back_%s'%name, globals())
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32
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33 def have_backend(name):
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34 '''Is backend "name" available?'''
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35 module = _modules.get(name, name)
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36 try:
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37 get_backend(name)
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38 return 1
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39 except ImportError, e:
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40 if not str(e).startswith('No module named %s'%module):
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41 raise
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42 return 0
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43
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44 def list_backends():
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45 '''List all available backend names.'''
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46 l = []
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47 for name in 'anydbm', 'mysql', 'sqlite', 'metakit', 'postgresql':
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48 if have_backend(name):
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49 l.append(name)
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50 return l
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52 # vim: set filetype=python ts=4 sw=4 et si
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