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annotate roundup/backends/back_sqlite.py @ 3306:ae1093684ef5

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merge from maint-0-7
author Richard Jones <richard@users.sourceforge.net>
date Mon, 02 May 2005 01:05:15 +0000
parents a9b0fe809d16
children 3518d1ffd940
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1 # $Id: back_sqlite.py,v 1.41 2005-05-02 01:05:15 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 rdbms_common
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16 import sqlite
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17
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18 def db_exists(config):
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19 return os.path.exists(os.path.join(config.DATABASE, 'db'))
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20
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21 def db_nuke(config):
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22 shutil.rmtree(config.DATABASE)
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23
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24 class Database(rdbms_common.Database):
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25 # char to use for positional arguments
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26 arg = '%s'
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27
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28 # used by some code to switch styles of query
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29 implements_intersect = 1
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30
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31 hyperdb_to_sql_datatypes = {
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32 hyperdb.String : 'VARCHAR(255)',
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33 hyperdb.Date : 'VARCHAR(30)',
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34 hyperdb.Link : 'INTEGER',
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35 hyperdb.Interval : 'VARCHAR(255)',
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36 hyperdb.Password : 'VARCHAR(255)',
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37 hyperdb.Boolean : 'BOOLEAN',
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38 hyperdb.Number : 'REAL',
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39 }
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40 hyperdb_to_sql_value = {
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41 hyperdb.String : str,
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42 hyperdb.Date : lambda x: x.serialise(),
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43 hyperdb.Link : int,
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44 hyperdb.Interval : str,
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45 hyperdb.Password : str,
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46 hyperdb.Boolean : int,
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47 hyperdb.Number : lambda x: x,
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48 hyperdb.Multilink : lambda x: x, # used in journal marshalling
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49 }
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50 sql_to_hyperdb_value = {
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51 hyperdb.String : str,
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52 hyperdb.Date : lambda x: date.Date(str(x)),
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53 hyperdb.Link : str, # XXX numeric ids
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54 hyperdb.Interval : date.Interval,
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55 hyperdb.Password : lambda x: password.Password(encrypted=x),
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56 hyperdb.Boolean : int,
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57 hyperdb.Number : rdbms_common._num_cvt,
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58 hyperdb.Multilink : lambda x: x, # used in journal marshalling
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59 }
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60
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61 def sqlite_busy_handler(self, data, table, count):
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62 """invoked whenever SQLite tries to access a database that is locked"""
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63 if count == 1:
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64 # use a 30 second timeout (extraordinarily generous)
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65 # for handling locked database
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66 self._busy_handler_endtime = time.time() + 30
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67 elif time.time() > self._busy_handler_endtime:
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68 # timeout expired - no more retries
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69 return 0
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70 # sleep adaptively as retry count grows,
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71 # starting from about half a second
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72 time_to_sleep = 0.01 * (2 << min(5, count))
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73 time.sleep(time_to_sleep)
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74 return 1
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75
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76 def sql_open_connection(self):
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77 '''Open a standard, non-autocommitting connection.
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78
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79 pysqlite will automatically BEGIN TRANSACTION for us.
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80 '''
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81 # make sure the database directory exists
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82 # database itself will be created by sqlite if needed
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83 if not os.path.isdir(self.config.DATABASE):
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84 os.makedirs(self.config.DATABASE)
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85
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86 db = os.path.join(self.config.DATABASE, 'db')
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87 logging.getLogger('hyperdb').info('open database %r'%db)
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88 conn = sqlite.connect(db=db)
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89 # set a 30 second timeout (extraordinarily generous) for handling
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90 # locked database
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91 conn.db.sqlite_busy_handler(self.sqlite_busy_handler)
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92 cursor = conn.cursor()
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93 return (conn, cursor)
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94
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95 def open_connection(self):
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96 # ensure files are group readable and writable
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97 os.umask(0002)
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98
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99 (self.conn, self.cursor) = self.sql_open_connection()
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100
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101 try:
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102 self.load_dbschema()
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103 except sqlite.DatabaseError, error:
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104 if str(error) != 'no such table: schema':
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105 raise
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106 self.init_dbschema()
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107 self.sql('create table schema (schema varchar)')
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108 self.sql('create table ids (name varchar, num integer)')
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109 self.sql('create index ids_name_idx on ids(name)')
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110 self.create_version_2_tables()
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111
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112 def create_version_2_tables(self):
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113 self.sql('create table otks (otk_key varchar, '
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114 'otk_value varchar, otk_time integer)')
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115 self.sql('create index otks_key_idx on otks(otk_key)')
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116 self.sql('create table sessions (session_key varchar, '
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117 'session_time integer, session_value varchar)')
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118 self.sql('create index sessions_key_idx on '
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119 'sessions(session_key)')
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120
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121 # full-text indexing store
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122 self.sql('CREATE TABLE __textids (_class varchar, '
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123 '_itemid varchar, _prop varchar, _textid integer primary key) ')
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124 self.sql('CREATE TABLE __words (_word varchar, '
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125 '_textid integer)')
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126 self.sql('CREATE INDEX words_word_ids ON __words(_word)')
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127 sql = 'insert into ids (name, num) values (%s,%s)'%(self.arg, self.arg)
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128 self.sql(sql, ('__textids', 1))
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129
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130 def add_new_columns_v2(self):
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131 # update existing tables to have the new actor column
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132 tables = self.database_schema['tables']
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133 for classname, spec in self.classes.items():
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134 if tables.has_key(classname):
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135 dbspec = tables[classname]
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136 self.update_class(spec, dbspec, force=1, adding_v2=1)
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137 # we've updated - don't try again
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138 tables[classname] = spec.schema()
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139
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140 def fix_version_3_tables(self):
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141 # NOOP - no restriction on column length here
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142 pass
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143
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144 def update_class(self, spec, old_spec, force=0, adding_v2=0):
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145 ''' Determine the differences between the current spec and the
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146 database version of the spec, and update where necessary.
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147
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148 If 'force' is true, update the database anyway.
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149
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150 SQLite doesn't have ALTER TABLE, so we have to copy and
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151 regenerate the tables with the new schema.
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152 '''
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153 new_has = spec.properties.has_key
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154 new_spec = spec.schema()
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155 new_spec[1].sort()
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156 old_spec[1].sort()
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157 if not force and new_spec == old_spec:
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158 # no changes
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159 return 0
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160
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161 logging.getLogger('hyperdb').info('update_class %s'%spec.classname)
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162
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163 # detect multilinks that have been removed, and drop their table
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164 old_has = {}
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165 for name, prop in old_spec[1]:
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166 old_has[name] = 1
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167 if new_has(name) or not isinstance(prop, hyperdb.Multilink):
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168 continue
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169 # it's a multilink, and it's been removed - drop the old
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170 # table. First drop indexes.
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171 self.drop_multilink_table_indexes(spec.classname, ml)
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172 sql = 'drop table %s_%s'%(spec.classname, prop)
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173 self.sql(sql)
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174 old_has = old_has.has_key
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175
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176 # now figure how we populate the new table
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177 if adding_v2:
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178 fetch = ['_activity', '_creation', '_creator']
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179 else:
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180 fetch = ['_actor', '_activity', '_creation', '_creator']
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181 properties = spec.getprops()
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182 for propname,x in new_spec[1]:
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183 prop = properties[propname]
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184 if isinstance(prop, hyperdb.Multilink):
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185 if not old_has(propname):
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186 # we need to create the new table
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187 self.create_multilink_table(spec, propname)
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188 elif force:
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189 tn = '%s_%s'%(spec.classname, propname)
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190 # grabe the current values
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191 sql = 'select linkid, nodeid from %s'%tn
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192 self.sql(sql)
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193 rows = self.cursor.fetchall()
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194
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195 # drop the old table
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196 self.drop_multilink_table_indexes(spec.classname, propname)
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197 sql = 'drop table %s'%tn
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198 self.sql(sql)
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199
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200 # re-create and populate the new table
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201 self.create_multilink_table(spec, propname)
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202 sql = '''insert into %s (linkid, nodeid) values
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203 (%s, %s)'''%(tn, self.arg, self.arg)
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204 for linkid, nodeid in rows:
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205 self.sql(sql, (int(linkid), int(nodeid)))
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206 elif old_has(propname):
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207 # we copy this col over from the old table
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208 fetch.append('_'+propname)
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209
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210 # select the data out of the old table
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211 fetch.append('id')
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212 fetch.append('__retired__')
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213 fetchcols = ','.join(fetch)
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214 cn = spec.classname
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215 sql = 'select %s from _%s'%(fetchcols, cn)
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216 self.sql(sql)
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217 olddata = self.cursor.fetchall()
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218
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219 # TODO: update all the other index dropping code
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220 self.drop_class_table_indexes(cn, old_spec[0])
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221
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222 # drop the old table
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223 self.sql('drop table _%s'%cn)
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224
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225 # create the new table
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226 self.create_class_table(spec)
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227
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228 if olddata:
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229 inscols = ['id', '_actor', '_activity', '_creation', '_creator']
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230 for propname,x in new_spec[1]:
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231 prop = properties[propname]
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232 if isinstance(prop, hyperdb.Multilink):
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233 continue
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234 elif isinstance(prop, hyperdb.Interval):
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235 inscols.append('_'+propname)
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236 inscols.append('__'+propname+'_int__')
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237 elif old_has(propname):
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238 # we copy this col over from the old table
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239 inscols.append('_'+propname)
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240
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241 # do the insert of the old data - the new columns will have
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diff changeset
242 # NULL values
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243 args = ','.join([self.arg for x in inscols])
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244 cols = ','.join(inscols)
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diff changeset
245 sql = 'insert into _%s (%s) values (%s)'%(cn, cols, args)
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246 for entry in olddata:
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247 d = []
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248 for name in inscols:
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249 # generate the new value for the Interval int column
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250 if name.endswith('_int__'):
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diff changeset
251 name = name[2:-6]
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252 if entry.has_key(name):
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diff changeset
253 v = hyperdb.Interval(entry[name]).as_seconds()
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diff changeset
254 else:
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255 v = None
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256 elif entry.has_key(name):
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diff changeset
257 v = entry[name]
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258 else:
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diff changeset
259 v = None
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260 d.append(v)
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diff changeset
261 self.sql(sql, tuple(d))
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262
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263 return 1
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diff changeset
264
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diff changeset
265 def sql_close(self):
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266 ''' Squash any error caused by us already having closed the
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diff changeset
267 connection.
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268 '''
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diff changeset
269 try:
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270 self.conn.close()
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271 except sqlite.ProgrammingError, value:
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272 if str(value) != 'close failed - Connection is closed.':
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273 raise
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274
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275 def sql_rollback(self):
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276 ''' Squash any error caused by us having closed the connection (and
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277 therefore not having anything to roll back)
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278 '''
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279 try:
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280 self.conn.rollback()
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281 except sqlite.ProgrammingError, value:
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282 if str(value) != 'rollback failed - Connection is closed.':
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283 raise
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284
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285 def __repr__(self):
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286 return '<roundlite 0x%x>'%id(self)
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287
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288 def sql_commit(self):
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289 ''' Actually commit to the database.
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290
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291 Ignore errors if there's nothing to commit.
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292 '''
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293 try:
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294 self.conn.commit()
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295 except sqlite.DatabaseError, error:
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296 if str(error) != 'cannot commit - no transaction is active':
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297 raise
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298 # open a new cursor for subsequent work
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299 self.cursor = self.conn.cursor()
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300
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301 def sql_index_exists(self, table_name, index_name):
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302 self.sql('pragma index_list(%s)'%table_name)
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303 for entry in self.cursor.fetchall():
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304 if entry[1] == index_name:
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305 return 1
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306 return 0
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307
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308 # old-skool id generation
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309 def newid(self, classname):
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310 ''' Generate a new id for the given class
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311 '''
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312 # get the next ID
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313 sql = 'select num from ids where name=%s'%self.arg
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314 self.sql(sql, (classname, ))
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315 newid = int(self.cursor.fetchone()[0])
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316
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317 # update the counter
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318 sql = 'update ids set num=%s where name=%s'%(self.arg, self.arg)
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319 vals = (int(newid)+1, classname)
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320 self.sql(sql, vals)
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321
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322 # return as string
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323 return str(newid)
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324
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325 def setid(self, classname, setid):
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326 ''' Set the id counter: used during import of database
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327
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328 We add one to make it behave like the sequences in postgres.
2098
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329 '''
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330 sql = 'update ids set num=%s where name=%s'%(self.arg, self.arg)
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331 vals = (int(setid)+1, classname)
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332 self.sql(sql, vals)
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333
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334 def clear(self):
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335 # set the id counters to 0 (setid adds one) so we start at 1
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336 rdbms_common.Database.clear(self)
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337 for cn in self.classes.keys():
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338 self.setid(cn, 0)
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339
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340 def create_class(self, spec):
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341 rdbms_common.Database.create_class(self, spec)
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342 sql = 'insert into ids (name, num) values (%s, %s)'
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343 vals = (spec.classname, 1)
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344 self.sql(sql, vals)
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345
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346 class sqliteClass:
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347 def filter(self, search_matches, filterspec, sort=(None,None),
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348 group=(None,None)):
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349 ''' If there's NO matches to a fetch, sqlite returns NULL
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350 instead of nothing
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351 '''
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352 return filter(None, rdbms_common.Class.filter(self, search_matches,
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353 filterspec, sort=sort, group=group))
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354
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355 class Class(sqliteClass, rdbms_common.Class):
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356 pass
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357
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358 class IssueClass(sqliteClass, rdbms_common.IssueClass):
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359 pass
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360
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361 class FileClass(sqliteClass, rdbms_common.FileClass):
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362 pass
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363
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diff changeset
364 # vim: set et sts=4 sw=4 :
Roundup Issue Tracker: http://roundup-tracker.org/