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annotate roundup/backends/back_bsddb3.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 32e41ddf2edb
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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_bsddb3.py,v 1.15 2002-07-19 03:36:34 richard Exp $
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19
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20 import bsddb3, os, marshal
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21 from roundup import hyperdb, date
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22
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23 # these classes are so similar, we just use the anydbm methods
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24 from back_anydbm import Database, Class, FileClass, IssueClass
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25
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26 #
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27 # Now the database
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28 #
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29 class Database(Database):
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30 """A database for storing records containing flexible data types."""
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31 #
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32 # Class DBs
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33 #
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34 def clear(self):
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35 for cn in self.classes.keys():
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36 db = os.path.join(self.dir, 'nodes.%s'%cn)
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37 bsddb3.btopen(db, 'n')
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38 db = os.path.join(self.dir, 'journals.%s'%cn)
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39 bsddb3.btopen(db, 'n')
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40
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41 def getclassdb(self, classname, mode='r'):
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42 ''' grab a connection to the class db that will be used for
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43 multiple actions
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44 '''
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45 path = os.path.join(os.getcwd(), self.dir, 'nodes.%s'%classname)
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46 if os.path.exists(path):
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47 return bsddb3.btopen(path, mode)
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48 else:
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49 return bsddb3.btopen(path, 'c')
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50
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51 def opendb(self, name, mode):
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52 '''Low-level database opener that gets around anydbm/dbm
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53 eccentricities.
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54 '''
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55 if __debug__:
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56 print >>hyperdb.DEBUG, self, 'opendb', (self, name, mode)
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57 # determine which DB wrote the class file
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58 path = os.path.join(os.getcwd(), self.dir, name)
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59 if not os.path.exists(path):
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60 if __debug__:
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61 print >>hyperdb.DEBUG, "opendb bsddb3.open(%r, 'c')"%path
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62 return bsddb3.btopen(path, 'c')
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63
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64 # open the database with the correct module
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65 if __debug__:
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66 print >>hyperdb.DEBUG, "opendb bsddb3.open(%r, %r)"%(path, mode)
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67 return bsddb3.btopen(path, mode)
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68
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69 #
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70 # Journal
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71 #
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72 def getjournal(self, classname, nodeid):
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73 ''' get the journal for id
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74 '''
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75 # attempt to open the journal - in some rare cases, the journal may
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76 # not exist
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77 try:
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78 db = bsddb3.btopen(os.path.join(self.dir, 'journals.%s'%classname),
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79 'r')
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80 except bsddb3._db.DBNoSuchFileError:
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81 raise IndexError, 'no such %s %s'%(classname, nodeid)
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82 # more handling of bad journals
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83 if not db.has_key(nodeid):
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84 raise IndexError, 'no such %s %s'%(classname, nodeid)
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85 journal = marshal.loads(db[nodeid])
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86 res = []
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87 for entry in journal:
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88 (nodeid, date_stamp, user, action, params) = entry
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89 date_obj = date.Date(date_stamp)
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90 res.append((nodeid, date_obj, user, action, params))
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91 db.close()
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92 return res
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93
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94 def getCachedJournalDB(self, classname):
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95 ''' get the journal db, looking in our cache of databases for commit
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96 '''
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97 # get the database handle
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98 db_name = 'journals.%s'%classname
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99 if self.databases.has_key(db_name):
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100 return self.databases[db_name]
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101 else:
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102 db = bsddb3.btopen(os.path.join(self.dir, db_name), 'c')
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103 self.databases[db_name] = db
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104 return db
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105
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106 def doSaveJournal(self, classname, nodeid, action, params):
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107 # serialise first
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108 if action in ('set', 'create'):
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109 params = self.serialise(classname, params)
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110
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111 entry = (nodeid, date.Date().get_tuple(), self.journaltag, action,
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112 params)
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113
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114 if __debug__:
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115 print >>hyperdb.DEBUG, 'doSaveJournal', entry
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116
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117 db = self.getCachedJournalDB(classname)
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118
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119 if db.has_key(nodeid):
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120 s = db[nodeid]
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121 l = marshal.loads(s)
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122 l.append(entry)
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123 else:
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124 l = [entry]
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125
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126 db[nodeid] = marshal.dumps(l)
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127
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128 #
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129 #$Log: not supported by cvs2svn $
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130 #Revision 1.14 2002/07/14 02:05:54 richard
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131 #. all storage-specific code (ie. backend) is now implemented by the backends
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132 #
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133 #Revision 1.13 2002/07/08 06:41:03 richard
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134 #Was reopening the database with 'n'.
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135 #
815
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136 #Revision 1.12 2002/05/21 05:52:11 richard
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137 #Well whadya know, bsddb3 works again.
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138 #The backend is implemented _exactly_ the same as bsddb - so there's no
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139 #using its transaction or locking support. It'd be nice to use those some
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140 #day I suppose.
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141 #
726
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142 #Revision 1.11 2002/01/14 02:20:15 richard
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143 # . changed all config accesses so they access either the instance or the
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144 # config attriubute on the db. This means that all config is obtained from
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145 # instance_config instead of the mish-mash of classes. This will make
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146 # switching to a ConfigParser setup easier too, I hope.
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147 #
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148 #At a minimum, this makes migration a _little_ easier (a lot easier in the
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149 #0.5.0 switch, I hope!)
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150 #
524
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151 #Revision 1.10 2001/11/21 02:34:18 richard
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152 #Added a target version field to the extended issue schema
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153 #
394
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154 #Revision 1.9 2001/10/09 23:58:10 richard
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155 #Moved the data stringification up into the hyperdb.Class class' get, set
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156 #and create methods. This means that the data is also stringified for the
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157 #journal call, and removes duplication of code from the backends. The
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158 #backend code now only sees strings.
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159 #
275
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160 #Revision 1.8 2001/10/09 07:25:59 richard
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161 #Added the Password property type. See "pydoc roundup.password" for
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162 #implementation details. Have updated some of the documentation too.
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163 #
270
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164 #Revision 1.7 2001/08/12 06:32:36 richard
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165 #using isinstance(blah, Foo) now instead of isFooType
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166 #
224
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167 #Revision 1.6 2001/08/07 00:24:42 richard
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168 #stupid typo
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169 #
214
18134bffab37 stupid typo
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170 #Revision 1.5 2001/08/07 00:15:51 richard
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171 #Added the copyright/license notice to (nearly) all files at request of
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172 #Bizar Software.
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173 #
213
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174 #Revision 1.4 2001/08/03 02:45:47 anthonybaxter
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175 #'n' -> 'c' for create.
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176 #
196
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177 #Revision 1.3 2001/07/30 02:36:23 richard
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178 #Handle non-existence of db files in the other backends (code from anydbm).
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179 #
152
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180 #Revision 1.2 2001/07/30 01:41:36 richard
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181 #Makes schema changes mucho easier.
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182 #
149
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183 #Revision 1.1 2001/07/24 04:26:03 anthonybaxter
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184 #bsddb3 implementation. For now, it's the bsddb implementation with a "3"
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185 #added in crayon.
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186 #
64
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187 #Revision 1.4 2001/07/23 08:25:33 richard
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188 #more handling of bad journals
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189 #
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190 #Revision 1.3 2001/07/23 08:20:44 richard
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191 #Moved over to using marshal in the bsddb and anydbm backends.
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192 #roundup-admin now has a "freshen" command that'll load/save all nodes (not
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193 # retired - mod hyperdb.Class.list() so it lists retired nodes)
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194 #
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195 #Revision 1.2 2001/07/23 07:56:05 richard
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196 #Storing only marshallable data in the db - no nasty pickled class references.
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197 #
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198 #Revision 1.1 2001/07/23 07:22:13 richard
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199 #*sigh* some databases have _foo.so as their underlying implementation.
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200 #This time for sure, Rocky.
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201 #
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202 #Revision 1.1 2001/07/23 07:15:57 richard
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203 #Moved the backends into the backends package. Anydbm hasn't been tested at all.
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204 #
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205 #Revision 1.1 2001/07/23 06:23:41 richard
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206 #moved hyper_bsddb.py to the new backends package as bsddb.py
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207 #
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208 #Revision 1.2 2001/07/22 12:09:32 richard
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209 #Final commit of Grande Splite
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210 #
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211 #Revision 1.1 2001/07/22 11:58:35 richard
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212 #More Grande Splite
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213 #
Roundup Issue Tracker: http://roundup-tracker.org/