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annotate roundup/backends/back_sqlite.py @ 2094:85d8ebe34c40

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sqlite doesn't need external locking
author Richard Jones <richard@users.sourceforge.net>
date Sun, 21 Mar 2004 23:45:44 +0000
parents 3f6024ab2c7a
children 18addf2a8596
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rev   line source
2094
85d8ebe34c40 sqlite doesn't need external locking
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1 # $Id: back_sqlite.py,v 1.19 2004-03-21 23:45:44 richard Exp $
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2 '''Implements a backend for SQLite.
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3
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4 See https://pysqlite.sourceforge.net/ for pysqlite info
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5 '''
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6 __docformat__ = 'restructuredtext'
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7
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8 import os, base64, marshal
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9
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10 from roundup import hyperdb
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11 from roundup.backends import rdbms_common
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12 import sqlite
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13
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14 class Database(rdbms_common.Database):
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15 # char to use for positional arguments
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16 arg = '%s'
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17
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18 def sql_open_connection(self):
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19 db = os.path.join(self.config.DATABASE, 'db')
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20 conn = sqlite.connect(db=db)
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21 cursor = conn.cursor()
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22 return (conn, cursor)
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23
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24 def open_connection(self):
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25 # ensure files are group readable and writable
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26 os.umask(0002)
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27
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28 (self.conn, self.cursor) = self.sql_open_connection()
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29
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30 try:
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31 self.load_dbschema()
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32 except sqlite.DatabaseError, error:
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33 if str(error) != 'no such table: schema':
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34 raise
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35 self.init_dbschema()
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36 self.cursor.execute('create table schema (schema varchar)')
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37 self.cursor.execute('create table ids (name varchar, num integer)')
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38 self.cursor.execute('create index ids_name_idx on ids(name)')
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39 self.create_version_2_tables()
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40
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41 def create_version_2_tables(self):
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42 self.cursor.execute('create table otks (otk_key varchar, '
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43 'otk_value varchar, otk_time integer)')
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44 self.cursor.execute('create index otks_key_idx on otks(otk_key)')
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45 self.cursor.execute('create table sessions (session_key varchar, '
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46 'session_time integer, session_value varchar)')
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47 self.cursor.execute('create index sessions_key_idx on '
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48 'sessions(session_key)')
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49
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50 # full-text indexing store
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51 self.cursor.execute('CREATE TABLE _textids (_class varchar, '
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52 '_itemid varchar, _prop varchar, _textid integer) ')
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53 self.cursor.execute('CREATE TABLE _words (_word varchar, '
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54 '_textid integer)')
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55 self.cursor.execute('CREATE INDEX words_word_ids ON _words(_word)')
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56 sql = 'insert into ids (name, num) values (%s,%s)'%(self.arg, self.arg)
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57 self.cursor.execute(sql, ('_textids', 1))
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58
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59 def add_actor_column(self):
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60 # update existing tables to have the new actor column
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61 tables = self.database_schema['tables']
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62 for classname, spec in self.classes.items():
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63 if tables.has_key(classname):
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64 dbspec = tables[classname]
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65 self.update_class(spec, dbspec, force=1, adding_actor=1)
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66
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67 def update_class(self, spec, old_spec, force=0, adding_actor=0):
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68 ''' Determine the differences between the current spec and the
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69 database version of the spec, and update where necessary.
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70
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71 If 'force' is true, update the database anyway.
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72
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73 SQLite doesn't have ALTER TABLE, so we have to copy and
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74 regenerate the tables with the new schema.
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75 '''
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76 new_has = spec.properties.has_key
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77 new_spec = spec.schema()
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78 new_spec[1].sort()
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79 old_spec[1].sort()
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80 if not force and new_spec == old_spec:
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81 # no changes
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82 return 0
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83
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84 if __debug__:
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85 print >>hyperdb.DEBUG, 'update_class FIRING'
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86
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87 # detect multilinks that have been removed, and drop their table
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88 old_has = {}
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89 for name,prop in old_spec[1]:
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90 old_has[name] = 1
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91 if new_has(name) or not isinstance(prop, hyperdb.Multilink):
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92 continue
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93 # it's a multilink, and it's been removed - drop the old
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94 # table. First drop indexes.
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95 self.drop_multilink_table_indexes(spec.classname, ml)
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96 sql = 'drop table %s_%s'%(spec.classname, prop)
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97 if __debug__:
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98 print >>hyperdb.DEBUG, 'update_class', (self, sql)
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99 self.cursor.execute(sql)
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100 old_has = old_has.has_key
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101
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102 # now figure how we populate the new table
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103 if adding_actor:
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104 fetch = ['_activity', '_creation', '_creator']
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105 else:
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106 fetch = ['_actor', '_activity', '_creation', '_creator']
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107 properties = spec.getprops()
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108 for propname,x in new_spec[1]:
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109 prop = properties[propname]
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110 if isinstance(prop, hyperdb.Multilink):
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111 if force or not old_has(propname):
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112 # we need to create the new table
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113 self.create_multilink_table(spec, propname)
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114 elif old_has(propname):
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115 # we copy this col over from the old table
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116 fetch.append('_'+propname)
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117
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118 # select the data out of the old table
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119 fetch.append('id')
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120 fetch.append('__retired__')
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121 fetchcols = ','.join(fetch)
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122 cn = spec.classname
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123 sql = 'select %s from _%s'%(fetchcols, cn)
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124 if __debug__:
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125 print >>hyperdb.DEBUG, 'update_class', (self, sql)
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126 self.cursor.execute(sql)
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127 olddata = self.cursor.fetchall()
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128
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129 # TODO: update all the other index dropping code
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130 self.drop_class_table_indexes(cn, old_spec[0])
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131
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132 # drop the old table
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133 self.cursor.execute('drop table _%s'%cn)
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134
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135 # create the new table
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136 self.create_class_table(spec)
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137
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138 if olddata:
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139 # do the insert of the old data - the new columns will have
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140 # NULL values
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141 args = ','.join([self.arg for x in fetch])
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142 sql = 'insert into _%s (%s) values (%s)'%(cn, fetchcols, args)
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143 if __debug__:
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144 print >>hyperdb.DEBUG, 'update_class', (self, sql, olddata[0])
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145 for entry in olddata:
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146 self.cursor.execute(sql, tuple(entry))
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147
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148 return 1
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149
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150 def sql_close(self):
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151 ''' Squash any error caused by us already having closed the
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152 connection.
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153 '''
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154 try:
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155 self.conn.close()
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156 except sqlite.ProgrammingError, value:
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157 if str(value) != 'close failed - Connection is closed.':
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158 raise
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159
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160 def sql_rollback(self):
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161 ''' Squash any error caused by us having closed the connection (and
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162 therefore not having anything to roll back)
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163 '''
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164 try:
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165 self.conn.rollback()
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166 except sqlite.ProgrammingError, value:
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167 if str(value) != 'rollback failed - Connection is closed.':
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168 raise
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169
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170 def __repr__(self):
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171 return '<roundlite 0x%x>'%id(self)
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172
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173 def sql_commit(self):
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174 ''' Actually commit to the database.
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175
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176 Ignore errors if there's nothing to commit.
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177 '''
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178 try:
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179 self.conn.commit()
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180 except sqlite.DatabaseError, error:
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181 if str(error) != 'cannot commit - no transaction is active':
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182 raise
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183
1906
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184 def sql_index_exists(self, table_name, index_name):
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185 self.cursor.execute('pragma index_list(%s)'%table_name)
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186 for entry in self.cursor.fetchall():
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187 if entry[1] == index_name:
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188 return 1
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189 return 0
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190
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191 class sqliteClass:
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192 def filter(self, search_matches, filterspec, sort=(None,None),
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193 group=(None,None)):
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194 ''' If there's NO matches to a fetch, sqlite returns NULL
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195 instead of nothing
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196 '''
1911
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197 return filter(None, rdbms_common.Class.filter(self, search_matches,
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198 filterspec, sort=sort, group=group))
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199
1911
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200 class Class(sqliteClass, rdbms_common.Class):
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201 pass
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diff changeset
202
1911
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diff changeset
203 class IssueClass(sqliteClass, rdbms_common.IssueClass):
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204 pass
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diff changeset
205
1911
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diff changeset
206 class FileClass(sqliteClass, rdbms_common.FileClass):
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207 pass
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diff changeset
208
1911
f5c804379c85 fixed ZRoundup - mostly changes to classic template
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diff changeset
209
Roundup Issue Tracker: http://roundup-tracker.org/