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annotate roundup/backends/back_gadfly.py @ 1244:8dd4f736370b

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merge from maintenance branch
author Richard Jones <richard@users.sourceforge.net>
date Thu, 03 Oct 2002 06:56:30 +0000
parents bc3bc3248dd1
children 6c24a86a12ae
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rev   line source
1244
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1 # $Id: back_gadfly.py,v 1.28 2002-10-03 06:56:29 richard Exp $
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2 ''' Gadlfy relational database hypderb backend.
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3
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4 About Gadfly
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5 ============
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6
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7 Gadfly is a collection of python modules that provides relational
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8 database functionality entirely implemented in Python. It supports a
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9 subset of the intergalactic standard RDBMS Structured Query Language
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10 SQL.
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11
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12
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13 Additional Instance Requirements
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14 ================================
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15
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16 The instance configuration must specify where the database is. It does this
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17 with GADFLY_DATABASE, which is used as the arguments to the gadfly.gadfly()
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18 method:
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19
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20 Using an on-disk database directly (not a good idea):
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21 GADFLY_DATABASE = (database name, directory)
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22
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23 Using a network database (much better idea):
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24 GADFLY_DATABASE = (policy, password, address, port)
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25
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26 Because multiple accesses directly to a gadfly database aren't handled, but
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27 multiple network accesses are, it's strongly advised that the latter setup be
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28 used.
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29
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30 '''
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31
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32 # standard python modules
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33 import sys, os, time, re, errno, weakref, copy
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34
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35 # roundup modules
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36 from roundup import hyperdb, date, password, roundupdb, security
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37 from roundup.hyperdb import String, Password, Date, Interval, Link, \
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38 Multilink, DatabaseError, Boolean, Number
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39
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40 # basic RDBMS backen implementation
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41 from roundup.backends import rdbms_common
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42
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43 # the all-important gadfly :)
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44 import gadfly
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45 import gadfly.client
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46 import gadfly.database
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47
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48 class Database(rdbms_common.Database):
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49 # char to use for positional arguments
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50 arg = '?'
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51
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52 def open_connection(self):
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53 db = getattr(self.config, 'GADFLY_DATABASE', ('database', self.dir))
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54 if len(db) == 2:
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55 # ensure files are group readable and writable
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56 os.umask(0002)
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57 try:
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58 self.conn = gadfly.gadfly(*db)
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59 except IOError, error:
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60 if error.errno != errno.ENOENT:
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61 raise
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62 self.database_schema = {}
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63 self.conn = gadfly.gadfly()
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64 self.conn.startup(*db)
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65 self.cursor = self.conn.cursor()
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66 self.cursor.execute('create table schema (schema varchar)')
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67 self.cursor.execute('create table ids (name varchar, num integer)')
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68 else:
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69 self.cursor = self.conn.cursor()
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70 self.cursor.execute('select schema from schema')
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71 self.database_schema = self.cursor.fetchone()[0]
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72 else:
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73 self.conn = gadfly.client.gfclient(*db)
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74 self.database_schema = self.load_dbschema()
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75
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76 def __repr__(self):
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77 return '<roundfly 0x%x>'%id(self)
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78
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79 def sql_fetchone(self):
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80 ''' Fetch a single row. If there's nothing to fetch, return None.
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81 '''
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82 try:
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83 return self.cursor.fetchone()
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84 except gadfly.database.error, message:
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85 if message == 'no more results':
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86 return None
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87 raise
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88
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89 def sql_fetchall(self):
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90 ''' Fetch a single row. If there's nothing to fetch, return [].
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91 '''
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92 try:
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93 return self.cursor.fetchall()
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94 except gadfly.database.error, message:
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95 if message == 'no more results':
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96 return []
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97 raise
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98
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99 def save_dbschema(self, schema):
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100 ''' Save the schema definition that the database currently implements
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101 '''
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102 self.sql('insert into schema values (?)', (self.database_schema,))
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103
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104 def load_dbschema(self):
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105 ''' Load the schema definition that the database currently implements
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106 '''
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107 self.cursor.execute('select schema from schema')
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108 return self.cursor.fetchone()[0]
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109
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110 def save_journal(self, classname, cols, nodeid, journaldate,
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111 journaltag, action, params):
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112 ''' Save the journal entry to the database
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113 '''
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114 # nothing special to do
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115 entry = (nodeid, journaldate, journaltag, action, params)
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116
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117 # do the insert
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118 a = self.arg
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119 sql = 'insert into %s__journal (%s) values (?,?,?,?,?)'%(classname,
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120 cols)
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121 if __debug__:
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122 print >>hyperdb.DEBUG, 'addjournal', (self, sql, entry)
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123 self.cursor.execute(sql, entry)
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124
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125 def load_journal(self, classname, cols, nodeid):
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126 ''' Load the journal from the database
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127 '''
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128 # now get the journal entries
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129 sql = 'select %s from %s__journal where nodeid=%s'%(cols, classname,
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130 self.arg)
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131 if __debug__:
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132 print >>hyperdb.DEBUG, 'getjournal', (self, sql, nodeid)
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133 self.cursor.execute(sql, (nodeid,))
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134 res = []
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135 for nodeid, date_stamp, user, action, params in self.cursor.fetchall():
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136 res.append((nodeid, date.Date(date_stamp), user, action, params))
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137 return res
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138
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139 class GadflyClass:
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140 def filter(self, search_matches, filterspec, sort, group):
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141 ''' Gadfly doesn't have a LIKE predicate :(
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142 '''
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143 cn = self.classname
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144
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145 # figure the WHERE clause from the filterspec
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146 props = self.getprops()
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147 frum = ['_'+cn]
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148 where = []
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149 args = []
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150 a = self.db.arg
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151 for k, v in filterspec.items():
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152 propclass = props[k]
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153 if isinstance(propclass, Multilink):
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154 tn = '%s_%s'%(cn, k)
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155 frum.append(tn)
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156 if isinstance(v, type([])):
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157 s = ','.join([a for x in v])
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158 where.append('id=%s.nodeid and %s.linkid in (%s)'%(tn,tn,s))
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159 args = args + v
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160 else:
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161 where.append('id=%s.nodeid and %s.linkid = %s'%(tn, tn, a))
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162 args.append(v)
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163 else:
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164 if isinstance(v, type([])):
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165 s = ','.join([a for x in v])
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166 where.append('_%s in (%s)'%(k, s))
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167 args = args + v
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168 else:
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169 where.append('_%s=%s'%(k, a))
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170 args.append(v)
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171
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172 # add results of full text search
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173 if search_matches is not None:
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174 v = search_matches.keys()
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175 s = ','.join([a for x in v])
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176 where.append('id in (%s)'%s)
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177 args = args + v
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178
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179 # "grouping" is just the first-order sorting in the SQL fetch
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180 # can modify it...)
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181 orderby = []
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182 ordercols = []
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183 if group[0] is not None and group[1] is not None:
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184 if group[0] != '-':
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185 orderby.append('_'+group[1])
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186 ordercols.append('_'+group[1])
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187 else:
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188 orderby.append('_'+group[1]+' desc')
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189 ordercols.append('_'+group[1])
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190
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191 # now add in the sorting
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192 group = ''
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193 if sort[0] is not None and sort[1] is not None:
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194 direction, colname = sort
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195 if direction != '-':
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196 if colname == 'id':
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197 orderby.append(colname)
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198 else:
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199 orderby.append('_'+colname)
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200 ordercols.append('_'+colname)
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201 else:
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202 if colname == 'id':
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203 orderby.append(colname+' desc')
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204 ordercols.append(colname)
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205 else:
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206 orderby.append('_'+colname+' desc')
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207 ordercols.append('_'+colname)
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208
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209 # construct the SQL
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210 frum = ','.join(frum)
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211 if where:
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212 where = ' where ' + (' and '.join(where))
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213 else:
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214 where = ''
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215 cols = ['id']
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216 if orderby:
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217 cols = cols + ordercols
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218 order = ' order by %s'%(','.join(orderby))
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219 else:
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220 order = ''
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221 cols = ','.join(cols)
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222 sql = 'select %s from %s %s%s%s'%(cols, frum, where, group, order)
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223 args = tuple(args)
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224 if __debug__:
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225 print >>hyperdb.DEBUG, 'filter', (self, sql, args)
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226 self.db.cursor.execute(sql, args)
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227 l = self.db.cursor.fetchall()
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228
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229 # return the IDs
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230 return [row[0] for row in l]
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231
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232 def find(self, **propspec):
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233 ''' Overload to filter out duplicates in the result
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234 '''
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235 d = {}
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236 for k in rdbms_common.Class.find(self, **propspec):
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237 d[k] = 1
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238 return d.keys()
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239
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240 class Class(GadflyClass, rdbms_common.Class):
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241 pass
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242 class IssueClass(GadflyClass, rdbms_common.IssueClass):
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243 pass
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244 class FileClass(GadflyClass, rdbms_common.FileClass):
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245 pass
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246
Roundup Issue Tracker: http://roundup-tracker.org/