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annotate roundup/backends/back_sqlite.py @ 3155:57b60bda9473

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Python 2.3 minimum version - bye bye roundup.rlog, you had a short life.
author Richard Jones <richard@users.sourceforge.net>
date Mon, 14 Feb 2005 02:48:12 +0000
parents d9b4224f955c
children a9b0fe809d16
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1 # $Id: back_sqlite.py,v 1.39 2005-02-14 02:48:11 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
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7 NOTE: we use the rdbms_common table creation methods which define datatypes
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8 for the columns, but sqlite IGNORES these specifications.
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9 '''
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10 __docformat__ = 'restructuredtext'
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11
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12 import os, base64, marshal, shutil, time, logging
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13
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14 from roundup import hyperdb, date, password
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15 from roundup.backends import locking
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16 from roundup.backends import rdbms_common
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17 import sqlite
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18
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19 def db_exists(config):
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20 return os.path.exists(os.path.join(config.DATABASE, 'db'))
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21
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22 def db_nuke(config):
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23 shutil.rmtree(config.DATABASE)
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24
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25 class Database(rdbms_common.Database):
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26 # char to use for positional arguments
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27 arg = '%s'
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28
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29 # used by some code to switch styles of query
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30 implements_intersect = 1
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31
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32 hyperdb_to_sql_datatypes = {
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33 hyperdb.String : 'VARCHAR(255)',
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34 hyperdb.Date : 'VARCHAR(30)',
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35 hyperdb.Link : 'INTEGER',
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36 hyperdb.Interval : 'VARCHAR(255)',
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37 hyperdb.Password : 'VARCHAR(255)',
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38 hyperdb.Boolean : 'BOOLEAN',
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39 hyperdb.Number : 'REAL',
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40 }
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41 hyperdb_to_sql_value = {
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42 hyperdb.String : str,
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43 hyperdb.Date : lambda x: x.serialise(),
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44 hyperdb.Link : int,
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45 hyperdb.Interval : str,
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46 hyperdb.Password : str,
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47 hyperdb.Boolean : int,
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48 hyperdb.Number : lambda x: x,
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49 hyperdb.Multilink : lambda x: x, # used in journal marshalling
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50 }
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51 sql_to_hyperdb_value = {
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52 hyperdb.String : str,
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53 hyperdb.Date : lambda x: date.Date(str(x)),
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54 hyperdb.Link : str, # XXX numeric ids
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55 hyperdb.Interval : date.Interval,
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56 hyperdb.Password : lambda x: password.Password(encrypted=x),
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57 hyperdb.Boolean : int,
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58 hyperdb.Number : rdbms_common._num_cvt,
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59 hyperdb.Multilink : lambda x: x, # used in journal marshalling
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60 }
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61
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62 def sqlite_busy_handler(self, data, table, count):
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63 """invoked whenever SQLite tries to access a database that is locked"""
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64 if count == 1:
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65 # use a 30 second timeout (extraordinarily generous)
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66 # for handling locked database
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67 self._busy_handler_endtime = time.time() + 30
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68 elif time.time() > self._busy_handler_endtime:
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69 # timeout expired - no more retries
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70 return 0
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71 # sleep adaptively as retry count grows,
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72 # starting from about half a second
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73 time_to_sleep = 0.01 * (2 << min(5, count))
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74 time.sleep(time_to_sleep)
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75 return 1
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76
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77 def sql_open_connection(self):
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78 '''Open a standard, non-autocommitting connection.
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79
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80 pysqlite will automatically BEGIN TRANSACTION for us.
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81 '''
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82 # make sure the database directory exists
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83 # database itself will be created by sqlite if needed
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84 if not os.path.isdir(self.config.DATABASE):
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85 os.makedirs(self.config.DATABASE)
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86
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87 db = os.path.join(self.config.DATABASE, 'db')
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88 logging.getLogger('hyperdb').info('open database %r'%db)
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89 conn = sqlite.connect(db=db)
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90 # set a 30 second timeout (extraordinarily generous) for handling
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91 # locked database
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92 conn.db.sqlite_busy_handler(self.sqlite_busy_handler)
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93 cursor = conn.cursor()
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94 return (conn, cursor)
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95
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96 def open_connection(self):
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97 # ensure files are group readable and writable
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98 os.umask(0002)
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99
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100 (self.conn, self.cursor) = self.sql_open_connection()
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101
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102 try:
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103 self.load_dbschema()
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104 except sqlite.DatabaseError, error:
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105 if str(error) != 'no such table: schema':
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106 raise
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107 self.init_dbschema()
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108 self.sql('create table schema (schema varchar)')
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109 self.sql('create table ids (name varchar, num integer)')
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110 self.sql('create index ids_name_idx on ids(name)')
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111 self.create_version_2_tables()
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112
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113 def create_version_2_tables(self):
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114 self.sql('create table otks (otk_key varchar, '
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115 'otk_value varchar, otk_time integer)')
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116 self.sql('create index otks_key_idx on otks(otk_key)')
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117 self.sql('create table sessions (session_key varchar, '
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118 'session_time integer, session_value varchar)')
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119 self.sql('create index sessions_key_idx on '
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120 'sessions(session_key)')
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121
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122 # full-text indexing store
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123 self.sql('CREATE TABLE __textids (_class varchar, '
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124 '_itemid varchar, _prop varchar, _textid integer primary key) ')
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125 self.sql('CREATE TABLE __words (_word varchar, '
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126 '_textid integer)')
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127 self.sql('CREATE INDEX words_word_ids ON __words(_word)')
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128 sql = 'insert into ids (name, num) values (%s,%s)'%(self.arg, self.arg)
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129 self.sql(sql, ('__textids', 1))
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130
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131 def add_new_columns_v2(self):
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132 # update existing tables to have the new actor column
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133 tables = self.database_schema['tables']
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134 for classname, spec in self.classes.items():
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135 if tables.has_key(classname):
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136 dbspec = tables[classname]
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137 self.update_class(spec, dbspec, force=1, adding_v2=1)
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138 # we've updated - don't try again
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139 tables[classname] = spec.schema()
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140
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141 def fix_version_3_tables(self):
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142 # NOOP - no restriction on column length here
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143 pass
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144
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145 def update_class(self, spec, old_spec, force=0, adding_v2=0):
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146 ''' Determine the differences between the current spec and the
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147 database version of the spec, and update where necessary.
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148
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149 If 'force' is true, update the database anyway.
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150
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151 SQLite doesn't have ALTER TABLE, so we have to copy and
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152 regenerate the tables with the new schema.
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153 '''
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154 new_has = spec.properties.has_key
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155 new_spec = spec.schema()
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156 new_spec[1].sort()
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157 old_spec[1].sort()
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158 if not force and new_spec == old_spec:
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159 # no changes
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160 return 0
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161
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162 logging.getLogger('hyperdb').info('update_class %s'%spec.classname)
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163
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164 # detect multilinks that have been removed, and drop their table
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165 old_has = {}
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166 for name, prop in old_spec[1]:
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167 old_has[name] = 1
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168 if new_has(name) or not isinstance(prop, hyperdb.Multilink):
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169 continue
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170 # it's a multilink, and it's been removed - drop the old
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171 # table. First drop indexes.
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172 self.drop_multilink_table_indexes(spec.classname, ml)
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173 sql = 'drop table %s_%s'%(spec.classname, prop)
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174 self.sql(sql)
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175 old_has = old_has.has_key
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176
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177 # now figure how we populate the new table
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178 if adding_v2:
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179 fetch = ['_activity', '_creation', '_creator']
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180 else:
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181 fetch = ['_actor', '_activity', '_creation', '_creator']
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182 properties = spec.getprops()
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183 for propname,x in new_spec[1]:
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184 prop = properties[propname]
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185 if isinstance(prop, hyperdb.Multilink):
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186 if not old_has(propname):
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187 # we need to create the new table
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188 self.create_multilink_table(spec, propname)
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189 elif force:
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190 tn = '%s_%s'%(spec.classname, propname)
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191 # grabe the current values
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192 sql = 'select linkid, nodeid from %s'%tn
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193 self.sql(sql)
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194 rows = self.cursor.fetchall()
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195
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196 # drop the old table
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197 self.drop_multilink_table_indexes(spec.classname, propname)
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198 sql = 'drop table %s'%tn
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199 self.sql(sql)
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200
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201 # re-create and populate the new table
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202 self.create_multilink_table(spec, propname)
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203 sql = '''insert into %s (linkid, nodeid) values
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204 (%s, %s)'''%(tn, self.arg, self.arg)
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205 for linkid, nodeid in rows:
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206 self.sql(sql, (int(linkid), int(nodeid)))
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207 elif old_has(propname):
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208 # we copy this col over from the old table
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209 fetch.append('_'+propname)
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210
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211 # select the data out of the old table
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212 fetch.append('id')
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213 fetch.append('__retired__')
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214 fetchcols = ','.join(fetch)
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215 cn = spec.classname
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216 sql = 'select %s from _%s'%(fetchcols, cn)
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217 self.sql(sql)
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218 olddata = self.cursor.fetchall()
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219
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220 # TODO: update all the other index dropping code
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221 self.drop_class_table_indexes(cn, old_spec[0])
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222
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223 # drop the old table
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224 self.sql('drop table _%s'%cn)
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225
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226 # create the new table
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227 self.create_class_table(spec)
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228
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229 if olddata:
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230 inscols = ['id', '_actor', '_activity', '_creation', '_creator']
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231 for propname,x in new_spec[1]:
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232 prop = properties[propname]
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233 if isinstance(prop, hyperdb.Multilink):
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234 continue
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235 elif isinstance(prop, hyperdb.Interval):
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236 inscols.append('_'+propname)
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237 inscols.append('__'+propname+'_int__')
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238 elif old_has(propname):
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239 # we copy this col over from the old table
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240 inscols.append('_'+propname)
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241
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242 # do the insert of the old data - the new columns will have
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diff changeset
243 # NULL values
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244 args = ','.join([self.arg for x in inscols])
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245 cols = ','.join(inscols)
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246 sql = 'insert into _%s (%s) values (%s)'%(cn, cols, args)
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247 for entry in olddata:
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248 d = []
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249 for name in inscols:
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250 # generate the new value for the Interval int column
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251 if name.endswith('_int__'):
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252 name = name[2:-6]
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253 if entry.has_key(name):
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254 v = hyperdb.Interval(entry[name]).as_seconds()
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255 else:
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256 v = None
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257 elif entry.has_key(name):
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258 v = entry[name]
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259 else:
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260 v = None
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261 d.append(v)
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diff changeset
262 self.sql(sql, tuple(d))
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263
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264 return 1
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diff changeset
265
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266 def sql_close(self):
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267 ''' Squash any error caused by us already having closed the
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268 connection.
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269 '''
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270 try:
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271 self.conn.close()
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272 except sqlite.ProgrammingError, value:
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273 if str(value) != 'close failed - Connection is closed.':
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274 raise
1236
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275
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276 def sql_rollback(self):
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277 ''' Squash any error caused by us having closed the connection (and
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278 therefore not having anything to roll back)
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279 '''
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280 try:
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281 self.conn.rollback()
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282 except sqlite.ProgrammingError, value:
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283 if str(value) != 'rollback failed - Connection is closed.':
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284 raise
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285
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286 def __repr__(self):
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287 return '<roundlite 0x%x>'%id(self)
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288
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289 def sql_commit(self):
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290 ''' Actually commit to the database.
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291
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292 Ignore errors if there's nothing to commit.
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293 '''
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294 try:
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295 self.conn.commit()
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296 except sqlite.DatabaseError, error:
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297 if str(error) != 'cannot commit - no transaction is active':
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298 raise
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299 # open a new cursor for subsequent work
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300 self.cursor = self.conn.cursor()
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301
1906
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302 def sql_index_exists(self, table_name, index_name):
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303 self.sql('pragma index_list(%s)'%table_name)
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304 for entry in self.cursor.fetchall():
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305 if entry[1] == index_name:
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306 return 1
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307 return 0
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308
2098
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309 # old-skool id generation
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310 def newid(self, classname):
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311 ''' Generate a new id for the given class
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312 '''
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313 # get the next ID
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314 sql = 'select num from ids where name=%s'%self.arg
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315 self.sql(sql, (classname, ))
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316 newid = int(self.cursor.fetchone()[0])
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317
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318 # update the counter
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319 sql = 'update ids set num=%s where name=%s'%(self.arg, self.arg)
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320 vals = (int(newid)+1, classname)
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321 self.sql(sql, vals)
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322
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323 # return as string
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324 return str(newid)
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325
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326 def setid(self, classname, setid):
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327 ''' Set the id counter: used during import of database
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328
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329 We add one to make it behave like the seqeunces in postgres.
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330 '''
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331 sql = 'update ids set num=%s where name=%s'%(self.arg, self.arg)
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332 vals = (int(setid)+1, classname)
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333 self.sql(sql, vals)
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334
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335 def create_class(self, spec):
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336 rdbms_common.Database.create_class(self, spec)
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337 sql = 'insert into ids (name, num) values (%s, %s)'
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338 vals = (spec.classname, 1)
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339 self.sql(sql, vals)
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340
1911
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341 class sqliteClass:
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342 def filter(self, search_matches, filterspec, sort=(None,None),
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343 group=(None,None)):
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344 ''' If there's NO matches to a fetch, sqlite returns NULL
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345 instead of nothing
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346 '''
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347 return filter(None, rdbms_common.Class.filter(self, search_matches,
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348 filterspec, sort=sort, group=group))
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349
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350 class Class(sqliteClass, rdbms_common.Class):
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351 pass
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352
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353 class IssueClass(sqliteClass, rdbms_common.IssueClass):
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354 pass
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355
1911
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diff changeset
356 class FileClass(sqliteClass, rdbms_common.FileClass):
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357 pass
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358
2645
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diff changeset
359 # vim: set et sts=4 sw=4 :
Roundup Issue Tracker: http://roundup-tracker.org/