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annotate roundup/backends/back_gadfly.py @ 1356:83f33642d220 maint-0.5

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author Richard Jones <richard@users.sourceforge.net>
date Thu, 09 Jan 2003 22:59:22 +0000
parents
children 1cc9c6bc17bd
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1356
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1 # $Id: back_gadfly.py,v 1.31 2003-01-08 05:39:40 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 from roundup.backends import locking
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40
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41 # basic RDBMS backen implementation
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42 from roundup.backends import rdbms_common
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43
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44 # the all-important gadfly :)
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45 import gadfly
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46 import gadfly.client
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47 import gadfly.database
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48
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49 class Database(rdbms_common.Database):
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50 # char to use for positional arguments
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51 arg = '?'
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52
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53 def open_connection(self):
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54 db = getattr(self.config, 'GADFLY_DATABASE', ('database', self.dir))
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55
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56 # lock it
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57 lockfilenm = os.path.join(db[1], db[0]) + '.lck'
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58 self.lockfile = locking.acquire_lock(lockfilenm)
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59 self.lockfile.write(str(os.getpid()))
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60 self.lockfile.flush()
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61
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62 if len(db) == 2:
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63 # ensure files are group readable and writable
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64 os.umask(0002)
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65 try:
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66 self.conn = gadfly.gadfly(*db)
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67 except IOError, error:
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68 if error.errno != errno.ENOENT:
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69 raise
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70 self.database_schema = {}
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71 self.conn = gadfly.gadfly()
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72 self.conn.startup(*db)
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73 self.cursor = self.conn.cursor()
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74 self.cursor.execute('create table schema (schema varchar)')
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75 self.cursor.execute('create table ids (name varchar, num integer)')
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76 else:
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77 self.cursor = self.conn.cursor()
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78 self.cursor.execute('select schema from schema')
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79 self.database_schema = self.cursor.fetchone()[0]
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80 else:
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81 self.conn = gadfly.client.gfclient(*db)
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82 self.database_schema = self.load_dbschema()
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83
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84 def __repr__(self):
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85 return '<roundfly 0x%x>'%id(self)
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86
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87 def sql_fetchone(self):
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88 ''' Fetch a single row. If there's nothing to fetch, return None.
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89 '''
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90 try:
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91 return self.cursor.fetchone()
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92 except gadfly.database.error, message:
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93 if message == 'no more results':
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94 return None
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95 raise
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96
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97 def sql_fetchall(self):
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98 ''' Fetch a single row. If there's nothing to fetch, return [].
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99 '''
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100 try:
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101 return self.cursor.fetchall()
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102 except gadfly.database.error, message:
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103 if message == 'no more results':
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104 return []
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105 raise
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106
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107 def save_dbschema(self, schema):
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108 ''' Save the schema definition that the database currently implements
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109 '''
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110 self.sql('insert into schema values (?)', (self.database_schema,))
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111
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112 def load_dbschema(self):
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113 ''' Load the schema definition that the database currently implements
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114 '''
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115 self.cursor.execute('select schema from schema')
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116 return self.cursor.fetchone()[0]
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117
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118 def save_journal(self, classname, cols, nodeid, journaldate,
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119 journaltag, action, params):
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120 ''' Save the journal entry to the database
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121 '''
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122 # nothing special to do
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123 entry = (nodeid, journaldate, journaltag, action, params)
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124
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125 # do the insert
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126 a = self.arg
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127 sql = 'insert into %s__journal (%s) values (?,?,?,?,?)'%(classname,
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128 cols)
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129 if __debug__:
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130 print >>hyperdb.DEBUG, 'addjournal', (self, sql, entry)
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131 self.cursor.execute(sql, entry)
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132
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133 def load_journal(self, classname, cols, nodeid):
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134 ''' Load the journal from the database
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135 '''
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136 # now get the journal entries
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137 sql = 'select %s from %s__journal where nodeid=%s'%(cols, classname,
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138 self.arg)
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139 if __debug__:
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140 print >>hyperdb.DEBUG, 'getjournal', (self, sql, nodeid)
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141 self.cursor.execute(sql, (nodeid,))
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142 res = []
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143 for nodeid, date_stamp, user, action, params in self.cursor.fetchall():
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144 res.append((nodeid, date.Date(date_stamp), user, action, params))
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145 return res
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146
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147 class GadflyClass:
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148 def filter(self, search_matches, filterspec, sort=(None,None),
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149 group=(None,None)):
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150 ''' Gadfly doesn't have a LIKE predicate :(
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151 '''
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152 cn = self.classname
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153
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154 # figure the WHERE clause from the filterspec
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155 props = self.getprops()
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156 frum = ['_'+cn]
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157 where = []
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158 args = []
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159 a = self.db.arg
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160 for k, v in filterspec.items():
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161 propclass = props[k]
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162 if isinstance(propclass, Multilink):
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163 tn = '%s_%s'%(cn, k)
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164 frum.append(tn)
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165 if isinstance(v, type([])):
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166 s = ','.join([a for x in v])
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167 where.append('id=%s.nodeid and %s.linkid in (%s)'%(tn,tn,s))
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168 args = args + v
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169 else:
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170 where.append('id=%s.nodeid and %s.linkid = %s'%(tn, tn, a))
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171 args.append(v)
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172 elif isinstance(propclass, Date):
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173 if isinstance(v, type([])):
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174 s = ','.join([a for x in v])
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175 where.append('_%s in (%s)'%(k, s))
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176 args = args + [date.Date(x).serialise() for x in v]
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177 else:
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178 where.append('_%s=%s'%(k, a))
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179 args.append(date.Date(v).serialise())
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180 elif isinstance(propclass, Interval):
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181 if isinstance(v, type([])):
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182 s = ','.join([a for x in v])
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183 where.append('_%s in (%s)'%(k, s))
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184 args = args + [date.Interval(x).serialise() for x in v]
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185 else:
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186 where.append('_%s=%s'%(k, a))
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187 args.append(date.Interval(v).serialise())
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188 else:
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189 if isinstance(v, type([])):
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190 s = ','.join([a for x in v])
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191 where.append('_%s in (%s)'%(k, s))
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192 args = args + v
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193 else:
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194 where.append('_%s=%s'%(k, a))
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195 args.append(v)
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196
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197 # add results of full text search
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198 if search_matches is not None:
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199 v = search_matches.keys()
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200 s = ','.join([a for x in v])
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201 where.append('id in (%s)'%s)
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202 args = args + v
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203
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204 # "grouping" is just the first-order sorting in the SQL fetch
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205 # can modify it...)
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206 orderby = []
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207 ordercols = []
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208 if group[0] is not None and group[1] is not None:
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209 if group[0] != '-':
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210 orderby.append('_'+group[1])
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211 ordercols.append('_'+group[1])
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212 else:
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213 orderby.append('_'+group[1]+' desc')
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214 ordercols.append('_'+group[1])
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215
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216 # now add in the sorting
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217 group = ''
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218 if sort[0] is not None and sort[1] is not None:
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219 direction, colname = sort
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220 if direction != '-':
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221 if colname == 'id':
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222 orderby.append(colname)
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223 else:
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224 orderby.append('_'+colname)
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225 ordercols.append('_'+colname)
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226 else:
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227 if colname == 'id':
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228 orderby.append(colname+' desc')
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229 ordercols.append(colname)
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230 else:
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231 orderby.append('_'+colname+' desc')
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232 ordercols.append('_'+colname)
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233
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234 # construct the SQL
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235 frum = ','.join(frum)
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236 if where:
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237 where = ' where ' + (' and '.join(where))
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238 else:
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239 where = ''
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240 cols = ['id']
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241 if orderby:
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242 cols = cols + ordercols
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243 order = ' order by %s'%(','.join(orderby))
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244 else:
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245 order = ''
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246 cols = ','.join(cols)
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247 sql = 'select %s from %s %s%s%s'%(cols, frum, where, group, order)
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248 args = tuple(args)
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249 if __debug__:
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250 print >>hyperdb.DEBUG, 'filter', (self, sql, args)
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251 self.db.cursor.execute(sql, args)
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252 l = self.db.cursor.fetchall()
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253
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254 # return the IDs
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255 return [row[0] for row in l]
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256
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257 def find(self, **propspec):
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258 ''' Overload to filter out duplicates in the result
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259 '''
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260 d = {}
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261 for k in rdbms_common.Class.find(self, **propspec):
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262 d[k] = 1
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263 return d.keys()
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264
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265 class Class(GadflyClass, rdbms_common.Class):
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266 pass
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267 class IssueClass(GadflyClass, rdbms_common.IssueClass):
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268 pass
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269 class FileClass(GadflyClass, rdbms_common.FileClass):
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270 pass
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271
Roundup Issue Tracker: http://roundup-tracker.org/