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annotate roundup/backends/back_gadfly.py @ 1222:bc3bc3248dd1

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added Class.find() unit test, fixed implementations
author Richard Jones <richard@users.sourceforge.net>
date Thu, 26 Sep 2002 03:04:24 +0000
parents e0032f4ab334
children 8dd4f736370b
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rev   line source
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bc3bc3248dd1 added Class.find() unit test, fixed implementations
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1 # $Id: back_gadfly.py,v 1.27 2002-09-26 03:04:24 richard Exp $
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2 __doc__ = '''
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3 About Gadfly
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4 ============
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5
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6 Gadfly is a collection of python modules that provides relational
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7 database functionality entirely implemented in Python. It supports a
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8 subset of the intergalactic standard RDBMS Structured Query Language
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9 SQL.
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10
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11
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12 Basic Structure
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13 ===============
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14
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15 We map roundup classes to relational tables. Automatically detect schema
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16 changes and modify the gadfly table schemas appropriately. Multilinks
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17 (which represent a many-to-many relationship) are handled through
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18 intermediate tables.
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19
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20 Journals are stored adjunct to the per-class tables.
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21
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22 Table names and columns have "_" prepended so the names can't
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23 clash with restricted names (like "order"). Retirement is determined by the
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24 __retired__ column being true.
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25
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26 All columns are defined as VARCHAR, since it really doesn't matter what
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27 type they're defined as. We stuff all kinds of data in there ;) [as long as
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28 it's marshallable, gadfly doesn't care]
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29
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30
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31 Additional Instance Requirements
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32 ================================
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33
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34 The instance configuration must specify where the database is. It does this
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35 with GADFLY_DATABASE, which is used as the arguments to the gadfly.gadfly()
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36 method:
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37
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38 Using an on-disk database directly (not a good idea):
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39 GADFLY_DATABASE = (database name, directory)
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40
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41 Using a network database (much better idea):
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42 GADFLY_DATABASE = (policy, password, address, port)
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43
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44 Because multiple accesses directly to a gadfly database aren't handled, but
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45 multiple network accesses are, it's strongly advised that the latter setup be
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46 used.
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47
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48 '''
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49
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50 # standard python modules
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51 import sys, os, time, re, errno, weakref, copy
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52
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53 # roundup modules
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54 from roundup import hyperdb, date, password, roundupdb, security
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55 from roundup.hyperdb import String, Password, Date, Interval, Link, \
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56 Multilink, DatabaseError, Boolean, Number
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57
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58 # basic RDBMS backen implementation
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59 from roundup.backends import rdbms_common
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60
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61 # the all-important gadfly :)
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62 import gadfly
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63 import gadfly.client
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64 import gadfly.database
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65
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66 class Database(rdbms_common.Database):
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67 # char to use for positional arguments
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68 arg = '?'
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69
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70 def open_connection(self):
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71 db = getattr(self.config, 'GADFLY_DATABASE', ('database', self.dir))
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72 if len(db) == 2:
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73 # ensure files are group readable and writable
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74 os.umask(0002)
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75 try:
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76 self.conn = gadfly.gadfly(*db)
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77 except IOError, error:
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78 if error.errno != errno.ENOENT:
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79 raise
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80 self.database_schema = {}
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81 self.conn = gadfly.gadfly()
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82 self.conn.startup(*db)
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83 self.cursor = self.conn.cursor()
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84 self.cursor.execute('create table schema (schema varchar)')
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85 self.cursor.execute('create table ids (name varchar, num integer)')
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86 else:
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87 self.cursor = self.conn.cursor()
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88 self.cursor.execute('select schema from schema')
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89 self.database_schema = self.cursor.fetchone()[0]
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90 else:
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91 self.conn = gadfly.client.gfclient(*db)
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92 self.database_schema = self.load_dbschema()
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93
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94 def __repr__(self):
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95 return '<roundfly 0x%x>'%id(self)
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96
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97 def sql_fetchone(self):
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98 ''' Fetch a single row. If there's nothing to fetch, return None.
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99 '''
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100 try:
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101 return self.cursor.fetchone()
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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 None
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105 raise
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106
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107 def sql_fetchall(self):
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108 ''' Fetch a single row. If there's nothing to fetch, return [].
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109 '''
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110 try:
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111 return self.cursor.fetchall()
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112 except gadfly.database.error, message:
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113 if message == 'no more results':
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114 return []
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115 raise
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116
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117 def save_dbschema(self, schema):
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118 ''' Save the schema definition that the database currently implements
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119 '''
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120 self.sql('insert into schema values (?)', (self.database_schema,))
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121
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122 def load_dbschema(self):
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123 ''' Load the schema definition that the database currently implements
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124 '''
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125 self.cursor.execute('select schema from schema')
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126 return self.cursor.fetchone()[0]
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127
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128 def save_journal(self, classname, cols, nodeid, journaldate,
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129 journaltag, action, params):
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130 ''' Save the journal entry to the database
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131 '''
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132 # nothing special to do
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133 entry = (nodeid, journaldate, journaltag, action, params)
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134
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135 # do the insert
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136 a = self.arg
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137 sql = 'insert into %s__journal (%s) values (?,?,?,?,?)'%(classname,
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138 cols)
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139 if __debug__:
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140 print >>hyperdb.DEBUG, 'addjournal', (self, sql, entry)
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141 self.cursor.execute(sql, entry)
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142
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143 def load_journal(self, classname, cols, nodeid):
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144 ''' Load the journal from the database
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145 '''
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146 # now get the journal entries
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147 sql = 'select %s from %s__journal where nodeid=%s'%(cols, classname,
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148 self.arg)
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149 if __debug__:
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150 print >>hyperdb.DEBUG, 'getjournal', (self, sql, nodeid)
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151 self.cursor.execute(sql, (nodeid,))
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152 res = []
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153 for nodeid, date_stamp, user, action, params in self.cursor.fetchall():
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154 res.append((nodeid, date.Date(date_stamp), user, action, params))
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155 return res
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156
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157 class GadflyClass:
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158 def filter(self, search_matches, filterspec, sort, group):
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159 ''' Gadfly doesn't have a LIKE predicate :(
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160 '''
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161 cn = self.classname
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162
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163 # figure the WHERE clause from the filterspec
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164 props = self.getprops()
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165 frum = ['_'+cn]
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166 where = []
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167 args = []
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168 a = self.db.arg
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169 for k, v in filterspec.items():
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170 propclass = props[k]
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171 if isinstance(propclass, Multilink):
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172 tn = '%s_%s'%(cn, k)
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173 frum.append(tn)
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174 if isinstance(v, type([])):
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175 s = ','.join([a for x in v])
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176 where.append('id=%s.nodeid and %s.linkid in (%s)'%(tn,tn,s))
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177 args = args + v
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178 else:
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179 where.append('id=%s.nodeid and %s.linkid = %s'%(tn, tn, a))
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180 args.append(v)
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181 else:
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182 if isinstance(v, type([])):
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183 s = ','.join([a for x in v])
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184 where.append('_%s in (%s)'%(k, s))
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185 args = args + v
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186 else:
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187 where.append('_%s=%s'%(k, a))
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188 args.append(v)
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189
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190 # add results of full text search
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191 if search_matches is not None:
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192 v = search_matches.keys()
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193 s = ','.join([a for x in v])
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194 where.append('id in (%s)'%s)
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195 args = args + v
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196
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197 # "grouping" is just the first-order sorting in the SQL fetch
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198 # can modify it...)
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199 orderby = []
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200 ordercols = []
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201 if group[0] is not None and group[1] is not None:
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202 if group[0] != '-':
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203 orderby.append('_'+group[1])
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204 ordercols.append('_'+group[1])
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205 else:
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206 orderby.append('_'+group[1]+' desc')
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207 ordercols.append('_'+group[1])
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208
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209 # now add in the sorting
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210 group = ''
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211 if sort[0] is not None and sort[1] is not None:
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212 direction, colname = sort
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213 if direction != '-':
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214 if colname == 'id':
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215 orderby.append(colname)
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216 else:
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217 orderby.append('_'+colname)
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218 ordercols.append('_'+colname)
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219 else:
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220 if colname == 'id':
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221 orderby.append(colname+' desc')
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222 ordercols.append(colname)
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223 else:
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224 orderby.append('_'+colname+' desc')
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225 ordercols.append('_'+colname)
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226
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227 # construct the SQL
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228 frum = ','.join(frum)
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229 if where:
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230 where = ' where ' + (' and '.join(where))
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231 else:
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232 where = ''
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233 cols = ['id']
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234 if orderby:
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235 cols = cols + ordercols
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236 order = ' order by %s'%(','.join(orderby))
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237 else:
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238 order = ''
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239 cols = ','.join(cols)
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240 sql = 'select %s from %s %s%s%s'%(cols, frum, where, group, order)
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241 args = tuple(args)
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242 if __debug__:
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243 print >>hyperdb.DEBUG, 'filter', (self, sql, args)
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244 self.db.cursor.execute(sql, args)
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245 l = self.db.cursor.fetchall()
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246
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247 # return the IDs
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248 return [row[0] for row in l]
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249
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250 def find(self, **propspec):
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251 ''' Overload to filter out duplicates in the result
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252 '''
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253 d = {}
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254 for k in rdbms_common.Class.find(self, **propspec):
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255 d[k] = 1
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256 return d.keys()
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257
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258 class Class(GadflyClass, rdbms_common.Class):
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259 pass
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260 class IssueClass(GadflyClass, rdbms_common.IssueClass):
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261 pass
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262 class FileClass(GadflyClass, rdbms_common.FileClass):
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263 pass
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264
Roundup Issue Tracker: http://roundup-tracker.org/