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annotate roundup/backends/back_bsddb.py @ 968:07d8a4e296f8

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Whee! It's not finished yet, but I can create a new instance... ...and play with it a little bit :)
author Richard Jones <richard@users.sourceforge.net>
date Thu, 22 Aug 2002 07:56:51 +0000
parents 974a4b94c5e3
children 16498e77e3ff
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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: back_bsddb.py,v 1.20 2002-07-19 03:36:34 richard Exp $
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19 '''
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20 This module defines a backend that saves the hyperdatabase in BSDDB.
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21 '''
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23 import bsddb, os, marshal
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24 from roundup import hyperdb, date
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26 # these classes are so similar, we just use the anydbm methods
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27 from back_anydbm import Database, Class, FileClass, IssueClass
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29 #
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30 # Now the database
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31 #
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32 class Database(Database):
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33 """A database for storing records containing flexible data types."""
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34 #
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35 # Class DBs
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36 #
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37 def clear(self):
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38 for cn in self.classes.keys():
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39 db = os.path.join(self.dir, 'nodes.%s'%cn)
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40 bsddb.btopen(db, 'n')
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41 db = os.path.join(self.dir, 'journals.%s'%cn)
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42 bsddb.btopen(db, 'n')
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43
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44 def getclassdb(self, classname, mode='r'):
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45 ''' grab a connection to the class db that will be used for
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46 multiple actions
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47 '''
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48 path = os.path.join(os.getcwd(), self.dir, 'nodes.%s'%classname)
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49 if os.path.exists(path):
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50 return bsddb.btopen(path, mode)
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51 else:
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52 return bsddb.btopen(path, 'n')
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53
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54 def opendb(self, name, mode):
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55 '''Low-level database opener that gets around anydbm/dbm
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56 eccentricities.
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57 '''
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58 if __debug__:
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59 print >>hyperdb.DEBUG, self, 'opendb', (self, name, mode)
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60 # determine which DB wrote the class file
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61 path = os.path.join(os.getcwd(), self.dir, name)
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62 if not os.path.exists(path):
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63 if __debug__:
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64 print >>hyperdb.DEBUG, "opendb bsddb.open(%r, 'n')"%path
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65 return bsddb.btopen(path, 'n')
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66
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67 # open the database with the correct module
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68 if __debug__:
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69 print >>hyperdb.DEBUG, "opendb bsddb.open(%r, %r)"%(path, mode)
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70 return bsddb.btopen(path, mode)
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71
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72 #
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73 # Journal
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74 #
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75 def getjournal(self, classname, nodeid):
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76 ''' get the journal for id
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77 '''
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78 # attempt to open the journal - in some rare cases, the journal may
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79 # not exist
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80 try:
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81 db = bsddb.btopen(os.path.join(self.dir, 'journals.%s'%classname),
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82 'r')
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83 except bsddb.error, error:
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84 if error.args[0] != 2: raise
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85 raise IndexError, 'no such %s %s'%(classname, nodeid)
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86 # more handling of bad journals
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87 if not db.has_key(nodeid):
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88 raise IndexError, 'no such %s %s'%(classname, nodeid)
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89 journal = marshal.loads(db[nodeid])
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90 res = []
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91 for entry in journal:
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92 (nodeid, date_stamp, user, action, params) = entry
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93 date_obj = date.Date(date_stamp)
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94 res.append((nodeid, date_obj, user, action, params))
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95 db.close()
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96 return res
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97
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98 def getCachedJournalDB(self, classname):
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99 ''' get the journal db, looking in our cache of databases for commit
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100 '''
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101 # get the database handle
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102 db_name = 'journals.%s'%classname
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103 if self.databases.has_key(db_name):
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104 return self.databases[db_name]
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105 else:
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106 db = bsddb.btopen(os.path.join(self.dir, db_name), 'c')
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107 self.databases[db_name] = db
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108 return db
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109
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110 def doSaveJournal(self, classname, nodeid, action, params):
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111 # serialise first
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112 if action in ('set', 'create'):
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113 params = self.serialise(classname, params)
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114
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115 entry = (nodeid, date.Date().get_tuple(), self.journaltag, action,
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116 params)
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117
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118 if __debug__:
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119 print >>hyperdb.DEBUG, 'doSaveJournal', entry
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120
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121 db = self.getCachedJournalDB(classname)
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122
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123 if db.has_key(nodeid):
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124 s = db[nodeid]
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125 l = marshal.loads(s)
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126 l.append(entry)
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127 else:
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128 l = [entry]
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129
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130 db[nodeid] = marshal.dumps(l)
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131
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132 #
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133 #$Log: not supported by cvs2svn $
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134 #Revision 1.19 2002/07/14 02:05:53 richard
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135 #. all storage-specific code (ie. backend) is now implemented by the backends
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136 #
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137 #Revision 1.18 2002/05/15 06:21:21 richard
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138 # . node caching now works, and gives a small boost in performance
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139 #
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140 #As a part of this, I cleaned up the DEBUG output and implemented TRACE
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141 #output (HYPERDBTRACE='file to trace to') with checkpoints at the start of
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142 #CGI requests. Run roundup with python -O to skip all the DEBUG/TRACE stuff
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143 #(using if __debug__ which is compiled out with -O)
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144 #
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145 #Revision 1.17 2002/04/03 05:54:31 richard
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146 #Fixed serialisation problem by moving the serialisation step out of the
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147 #hyperdb.Class (get, set) into the hyperdb.Database.
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148 #
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149 #Also fixed htmltemplate after the showid changes I made yesterday.
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150 #
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151 #Unit tests for all of the above written.
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152 #
676
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153 #Revision 1.16 2002/02/27 03:40:59 richard
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154 #Ran it through pychecker, made fixes
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155 #
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156 #Revision 1.15 2002/02/16 09:15:33 richard
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157 #forgot to patch bsddb backend too
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158 #
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159 #Revision 1.14 2002/01/22 07:21:13 richard
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160 #. fixed back_bsddb so it passed the journal tests
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161 #
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162 #... it didn't seem happy using the back_anydbm _open method, which is odd.
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163 #Yet another occurrance of whichdb not being able to recognise older bsddb
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164 #databases. Yadda yadda. Made the HYPERDBDEBUG stuff more sane in the
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165 #process.
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166 #
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167 #Revision 1.13 2001/12/10 22:20:01 richard
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168 #Enabled transaction support in the bsddb backend. It uses the anydbm code
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169 #where possible, only replacing methods where the db is opened (it uses the
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170 #btree opener specifically.)
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171 #Also cleaned up some change note generation.
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172 #Made the backends package work with pydoc too.
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173 #
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174 #Revision 1.12 2001/11/21 02:34:18 richard
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175 #Added a target version field to the extended issue schema
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176 #
394
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177 #Revision 1.11 2001/10/09 23:58:10 richard
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178 #Moved the data stringification up into the hyperdb.Class class' get, set
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179 #and create methods. This means that the data is also stringified for the
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180 #journal call, and removes duplication of code from the backends. The
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181 #backend code now only sees strings.
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182 #
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183 #Revision 1.10 2001/10/09 07:25:59 richard
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184 #Added the Password property type. See "pydoc roundup.password" for
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185 #implementation details. Have updated some of the documentation too.
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186 #
270
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187 #Revision 1.9 2001/08/12 06:32:36 richard
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188 #using isinstance(blah, Foo) now instead of isFooType
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189 #
224
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190 #Revision 1.8 2001/08/07 00:24:42 richard
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191 #stupid typo
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192 #
214
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193 #Revision 1.7 2001/08/07 00:15:51 richard
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194 #Added the copyright/license notice to (nearly) all files at request of
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195 #Bizar Software.
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196 #
213
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197 #Revision 1.6 2001/07/30 02:36:23 richard
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198 #Handle non-existence of db files in the other backends (code from anydbm).
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199 #
152
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200 #Revision 1.5 2001/07/30 01:41:36 richard
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201 #Makes schema changes mucho easier.
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202 #
149
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203 #Revision 1.4 2001/07/23 08:25:33 richard
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204 #more handling of bad journals
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205 #
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206 #Revision 1.3 2001/07/23 08:20:44 richard
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207 #Moved over to using marshal in the bsddb and anydbm backends.
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208 #roundup-admin now has a "freshen" command that'll load/save all nodes (not
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209 # retired - mod hyperdb.Class.list() so it lists retired nodes)
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210 #
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211 #Revision 1.2 2001/07/23 07:56:05 richard
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212 #Storing only marshallable data in the db - no nasty pickled class references.
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213 #
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214 #Revision 1.1 2001/07/23 07:22:13 richard
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215 #*sigh* some databases have _foo.so as their underlying implementation.
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216 #This time for sure, Rocky.
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217 #
46
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218 #Revision 1.1 2001/07/23 07:15:57 richard
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219 #Moved the backends into the backends package. Anydbm hasn't been tested at all.
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220 #
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221 #Revision 1.1 2001/07/23 06:23:41 richard
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222 #moved hyper_bsddb.py to the new backends package as bsddb.py
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223 #
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224 #Revision 1.2 2001/07/22 12:09:32 richard
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225 #Final commit of Grande Splite
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226 #
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227 #Revision 1.1 2001/07/22 11:58:35 richard
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228 #More Grande Splite
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229 #
Roundup Issue Tracker: http://roundup-tracker.org/